{"id":1442,"date":"2011-12-04T17:53:47","date_gmt":"2011-12-04T17:53:47","guid":{"rendered":"http:\/\/cms.impact-structures.com\/?page_id=454"},"modified":"2011-12-04T17:53:47","modified_gmt":"2011-12-04T17:53:47","slug":"claudin-f-and-ernstson-k-2004-review-of","status":"publish","type":"page","link":"http:\/\/estructuras-de-impacto.impact-structures.com\/?page_id=1442","title":{"rendered":"Review of Diaz Mart\u00ednez et al. (2002)"},"content":{"rendered":"

Claudin, F. and Ernstson, K. (2004): Review of:<\/h2>\n

Diaz Mart\u00ednez, E., Sanz Rubio, E. y Martinez Frias, J. (2002): Sedimentary record of impact events in Spain. Geological Society of America. Special Paper 356: 551-562.<\/span><\/h2>\n
Summary and Introduction<\/strong><\/h5>\n
In 2000, a meeting on Catastrophic Events and Mass Extinctions: Impacts and Beyond was held in Vienna. In the Proceedings book (Koeberl, C., and MacLeod, K. G., eds., Geological Society of America Special Paper 356), the article Diaz Mart\u00ednez, E., Sanz Rubio, E. y Martinez Frias, J (2002): Sedimentary record of impact events in Spain. Geological Society of America. Special Paper 356: 551-562 was printed. Obviously, the editors did not consider a sound peer review of this article necessary, although from the Acknowledgments, we learn that there was a review performed by B. Simonson and W. U. Reimold, complemented by comments of the editor C. Koeberl. However, with respect to a series of errors, omissions and dubious assertions we can’t understand why such a paper could have been published. Therefore, our objective is to make up this necessary sound review now and here in the form of a comment on the paper.<\/h5>\n

In the article, the Spanish authors from the Astrobiological Center in Madrid, which have never before made any active impact research, refer to different impact deposits on the Iberian peninsula. They address each of them with respect to their authenticity and whether they should be considered or not for future investigations. In fact, the discussed deposits provide a backdrop only for their central objective, namely to bring discredit upon the Azuara impact structure and to postulate its elimination from the lists of established impact structures.<\/p>\n

Concretely, in the case of the Azuara structure, the authors are putting forward quite a few assertions (in\u00a0bold italics<\/em><\/strong>) which we would like to comment with regard to our observations and interpretations most of which have been published previously. Here, we compile the most important data thereby referring also to new articles, and we add a lot of new photographs that may be interesting also for visitors of the impact region in Spain.<\/p>\n

Diaz Mart\u00ednez et al.:\u00a0Azuara is the only impact structure on the Iberian peninsula formally proposed as such<\/em><\/strong>.<\/p>\n

With respect to this assertion, it is emphasized – although we actually see that there is nobody as blind as the one who is not willing to see – that Azuara and Rubielos de la C\u00e9rida had already been proposed as an impact structures as early as 1994 (Ernstson et al., 1994), and in the January, 2001, issue of Geology, Azuara and Rubielos de la C\u00e9rida are explicitly discussed as paired impact structures to be the cause of the shock deformation of the autochthonous Buntsandstein conglomerates (Ernstson et al., 2001c).<\/p>\n

Diaz Mart\u00ednez et al.:\u00a0Since Azuara has in the eighties been proposed as an impact structure, the controversy has continued but with decreasing intensity because the arguments in favor of the impact hypothesis are progressively refused. This is why the majority of the evidences presented by the impact advocates are inconclusive or permit other explications.<\/em><\/strong><\/p>\n

The\u00a0evidence of an impact origin for the Azuara structure<\/em><\/strong>\u00a0was as such formally presented to the scientific community in 1985 (Ernstson et al., 1985). Later, and with respect to enhanced material accumulated in the following investigations, an impact origin was also strengthened for the Rubielos de la C\u00e9rida structure (Ernstson et al., 1994, 2001c). We add the host of publications performed by the impact advocates (Ernstson et al., 1987; Fiebag, 1988; Ernstson and Fiebag; 1992; Ernstson and Claudin, 1990, Claudin et al., 2001; M\u00fcller and Ernstson 1990; Ernstson et al., 2001 a, b; Hradil et al., 2001; Ernstson et al., 2002; Sch\u00fcssler et al., 2002) having progressively blown-up the controversy by provoking a number of articles and Reply papers (Cortes et al., 1999, 2002 a, b, Stel et al., 2002; Diaz Mart\u00ednez et al., 2002). Only recently, Azuara and Rubielos de la C\u00e9rida have been proposed to be part of a multiple impact comprising a much larger region on the Iberian Peninsula (Ernstson et al., 2003).<\/p>\n

With respect to the assertion that the proofs presented by the impact advocates are inconclusive, the question arises why and on the base of what. Here, we point to the most recent papers in which the impact opponents demand the elimination of Azuara from the the lists of established impact structures (Cortes et al., 2002; Diaz Mart\u00ednez et al., 2002). Every reader paying attention to the References of these papers, will be aware that they only contain arguments which, slightly varied, are identical to those of previously published articles (Aurell et al., 1993; Aurell, 1994). Thus, while the impact advocates provide new data, the arguments of the impact opponents amount to nothing more than pure repititions. Scientific progress reflected the whole time by the presentation of new evidences and proofs, is in this case evident in the articles of the impact advocates but not in those of the opponents.The discussion only too well reminds of previous and recent controversies related with other impact structures (Ries, Vredefort, etc.). In these cases, opponents of an impact origin (basically geologists familiar with non-impact geological models of the region) always argued that the data suggesting an impact could better be explained by non-impact models of the regional geologic setting (see, e.g., Dehm, 1969, Gibson and Reimold, 2001; Zimmerman, 2003). In fact, an observation can always be explained by different models, but usually one tends to choose the model that explains all the observations in the easiest and most coherent manner.<\/p>\n

Diaz Mart\u00ednez et al.:\u00a0Other impact structures of similar age and of comparable size (Haughton, Ries) present numerous impact features as are impact melt rocks and intense shock metamorphism. This is not observed in Azuara.<\/em><\/strong><\/p>\n

Impact features in Azuara hitherto studied, documented and referred to by the impact advocates are (Ernstson et al, 1985; Ernstson et al., 1987; Fiebag, 1988, Ernstson and Claudin, 1990; Ernstson and Fiebag, 1992, and many references therein; M\u00fcller and Ernstson 1990, Ernstson et al., 1994; Ernstson, 1994; Ernstson and Hilt, 2002; Claudin et al, 2001; Ernstson et al., 2001 (a, b, c); Ernstson et al., 2002 – most of the references having been printed when Diaz Martinez et al. edited their paper):<\/p>\n

microscopic silicate melt, relics of carbonate melt, a large diversity of monomictic and polymictic breccias and breccia dikes, extensive zones of megabreccias and monomictic movement breccias, dislocated megablocks, extensive and continuous impact ejecta, inverted stratigraphy, gravity anomalies consistent with an impact origin, high-pressure\/short-term deformations of clasts from the impact ejecta, spallation craters and spallation fractures in shocked quartzite cobbles from autochthonous conglomerates. The moderate to strong shock effects found in and reported for Azuara rocks are: schock-produced melt, diaplectic quartz and diaplectic glass, multiple sets of planar deformation features (PDFs; prevailing {10-13} and {10-12}orientations) in quartz, multiple sets of planar fractures (PFs) in quartz, extreme kink-banding in mica, and multiple sets of microtwins in calcite. We may discuss the interpretation of the observations, but they are not allowed to be said they do not exist or have not reported for Azuara. Here, it is emphasized that the results of the Azuara\/Rubielos de la C\u00e9rida impact research have been published by well-known journals like Earth and Planetary Science Letters, Geology, Meteoritics, and International Journal of Earth Sciences.<\/p>\n

Diaz Mart\u00ednez et al.:\u00a0Originally, the impact nature was proposed on the base of inverted stratigraphy, the occurrence of megabreccias, megablock and breccia dikes, and features pointing to high P\/T effects.<\/em><\/strong><\/p>\n

And:\u00a0The inverted stratigraphy is related with Alpidic tectonics.<\/em><\/strong><\/p>\n

The assertion that the inverted stratigraphy is related with Alpidic tectonics reveals the methodical thinking and working of the impact opponents. Instead of asking for and discussing the possible causes of inverted stratigraphy, they conclude from the, in their mind, non-existing impact event that the inverted stratigraphy must be related with Alpidic tectonics. And because the inverted stratigraphy is Alpidic, its existence cannot be used as argument in favor of an impact. The impact advocates have never claimed an unambiguous impact origin for the inverted stratigraphy, but they have pointed to the possibility, because inverted startigraphy (the \u00aboverturned flap\u00bb) can especially be expected in the rim zone of impact structures.<\/p>\n

\"Image001\"<\/p>\n

Fig. 1. Breccia dike samples from Sta. Cruz de Nogueras exhibiting shock metamorphism.<\/p>\n

\"Image003\"<\/p>\n

Fig. 2. Breccia dike with distinct mortar texture near Olalla.<\/p>\n

\"Image005\"<\/p>\n

Fig. 3. Breccia dike system cutting through Muschelkalk limestone near Olalla.<\/p>\n

\"Image007\"<\/p>\n

Fig. 4. Breccia dike in Muschelkalk limestone near Olalla.<\/p>\n

Moreover, it is curious to note that in the zones affected by inverted stratigraphy (an observation agreed to by both groups), breccia dikes occur (polymictic and monomictic; near Santa Cruz de Nogueras and Olalla) that cut through the inverted Paleozoic and Mesozoic rocks. Clear and strong shock metamorphism has been observed in some of these breccia dikes for which an origin from karst processes can clearly be excluded (see below and Figs. 1, 2, 3, 4).<\/p>\n

In addition to this curious coincidence, the rocks affected by the inversion, in this case the Muschelkalk limestones near Olalla, are presenting a structural style much more compatible with impact shock deformation than with \u00abnormal tectonics\u00bb. In these materials, we observe impressive rock polish and slickensides (Figs. 5, 6) on scales between tens of meters and millimeters similar to those described by Nicolaysen and Reimold for the Vredefort impact structure (Gibson and Reimold, 2001). The whole complex is characterized by a brecciation through and through over hundres of meters (monomictic movement breccia including grit brecciation and mortar texture; Figs. 7 – 10).<\/p>\n

\"Image009\"<\/p>\n

Fig. 5. Prominent rock polish in mega-brecciated Muschelkalk limestone; near Olalla.<\/p>\n

\"Image011\"<\/p>\n

Fig. 6. Peculiar slickenside mark in highly brecciated Muschelkalk limestone.<\/p>\n

\"Image013\"<\/p>\n

Fig. 7. Extensive megabrecciation of Muschelkalk limestone near Olalla.<\/p>\n

\"Image015\"<\/p>\n

Fig. 8. Impressive mortar texture in brecciated Muschelkalk limestone; near Olalla.<\/p>\n

\"Image017\"<\/p>\n

Fig. 9. Intense grit brecciation in Muschelkalk limestone; near Olalla.<\/p>\n

Diaz Mart\u00ednez et al.:\u00a0The major part of the breccias are diagenetic or pedogenetic (produced by the dissolution and collapse of evaporites, by karstification, and by calcrete formation).<\/em><\/strong><\/p>\n

Here, and although the impact opponents are cautious not to pretend that all breccias have a diagenetic and pedogenetic origin, some distinctions have to be made. Actually, when a breccia (monomictic or polymictic) is named an impact breccia, the impact advocates refer to the following features:<\/p>\n

Polymictic and monomictic breccias and breccia dikes:<\/span><\/p>\n

— Prominent breccia dikes are observed in carbonate as well as in silicate rocks. The polymictic breccia dikes cannot be confused with tectonic breccias. And karstification in silicate rocks of the Iberian System…. ?<\/p>\n

— Karstification is a process related with carbonate dissolution. Impact breccia dikes in the Azuara structure in general show sharp-edged clasts in the matrix and fragmented walls lacking any dissolution features, and, therefore, cannot possibly be confused with karst structures.<\/p>\n

— Breccias-within-breccias are abundant; multiple (up to four) generations are observed. Breccia-dike generations are common: Breccia dikes are running within other breccias dikes, or they cut them. These multiple breccia generations are hardly explained by karstification processes but are well known from impact structures (Fig. 10).<\/p>\n

\"Abb10\"<\/p>\n

Fig. 10. Breccia dike generations in Muschelkalk limestone.<\/p>\n

Frequently, fractured clasts in breccias dikes can be observed that are clearly coherent, shown by the fitting of the fragments, despite separation by the matrix (Figs. 11, 12). This texture is hardly explained by karstification and rather attributed to injection processes, all the more considering the reaction of the injected material with the fragments and the host rock which is also fractured.<\/p>\n

\"Image021\"<\/p>\n

Fig. 11. Large fractured limestone clast in a breccia dike. Note the penetration of the dike matrix into the fractured however coherent clast.<\/p>\n

\"Image023\"<\/p>\n

Fig. 12. Complex breccia dike system (slightly pink-colored) in limestone. – Dissolution and collapse of evaporites? Karstification? Calcrete formation?<\/p>\n

Within the clasts incorporated in breccias and breccia dikes, shock metamorphism is observed, and we need not stress that this is not typical of karstification or soil formation. Concretely, silicate melt particles, diaplectic glass, and PDFs have been reported for the polymictic dike breccias of, e.g., Santa Cruz de Nogueras and Muniesa (Ernstson et al., 1985, Fiebag, 1988; Ernstson and Fiebag, 1992, Ernstson, 1994; Ernstson et al., 2002). Except for the 2002 paper, all publications were printed when Diaz-Martinez et al. edited their paper.<\/p>\n

Breccias frequently contain clasts which look like wrapped by matrix material of different color (Fig. 13). This peculiar texture, far from being related with lacustrine or soil-formation processes as has been suggested by authors refusing the impact (Aurell, 1994; Cortes et al., 2001; Diaz et al., 2002), clearly points to accretion around a nucleus similar to accretionary lapilli (Lorenz, 1974; Reimer, 1983; Colombo y Mart\u00ed, 1989). Accretionary lapilli has been reported to occur also in the suevite of the Ries impact structure (Graup 1981). They have also been reported for ejecta deposits of the K\/T Chicxulub impact structure in Mexico and Belize and for the Late Devonian Alamo impact megabreccia.<\/p>\n

\"Image025\"<\/p>\n

Fig. 13. Accretionary lapilli in a prominent impact breccia dike near Olalla; also see here\u00a0http:\/\/www.impact-structures.com\/<\/a>\u00a0.<\/p>\n

The Belchite and Herrera de los Navarros megabreccias:<\/p>\n

As has again and again been pointed out previously (Fiebag, 1988; Ernstson and Fiebag, 1992; Katschorek, 1990; Ernstson, 1994), the megabreccia must not be confused with the Cort\u00e9s de Taju\u00f1a Fm. and the related collapse breccias. The confusion has been introduced by the impact opponents who suggest a brecciation by dissolution of evaporites. In fact, the megabreccia is polymictic, shows cataclastic flow texture, and the involved stratigraphy is different from the Cort\u00e9s de Taju\u00f1a Fm. For more details see\u00a0Megabreccia<\/a>\u00a0.<\/p>\n

Monomictic movement breccias (Reiff, 1978)<\/p>\n

On a small scale, monomictic movement breccias displaying grit brecciation, mortar texture and cataclastic flow texture my in rare cases be attributed to tectonics (cataclasites). When these breccias, however, cover areas uninterruptedly over hundreds of meters, as is the case in the Azuara and Rubielos de la C\u00e9rida structures (Ernstson et al., 1992; Ernstson, 1994; Ernstson et al., 2002), then an impact deformation is the only reasonable explanation.<\/p>\n

Suevite beccias:<\/p>\n

As early as in their 1992 paper, Ernstson and Fiebag have shown that the originally so-called basal breccia has the characteristics of a polymictic suevite breccia, that is shocked fragments and impact melt components in a clastic matrix.<\/p>\n

We add: Suevite breccias have also been reported for the Rubielos de la C\u00e9rida structure. They occur in the megabreccia zone of Barrachina – Torre los Negros together with impact melt rocks (by the impact opponents without any analysis said to be volcanic ash), diamictic megablocks and megablocks of limestone monomictic movement breccias (Hradil et al., 2001, Ernstson et al., 2001 a, Ernstson et al., 2002) (Figs. 14 – 16). The impact opponents interpret this impact-typical occurrence of a megabreccia containing suevites and impact melt rocks as a phenomenon related with the dissolution of gypsum.<\/p>\n

\"Image027\"<\/p>\n

Figs. 14, 15. Excavation\/emplacement in the impact cratering process: a complex superposition of flow, faulting and overthrusting of intermixing diamictic and sandy material.<\/p>\n

\"Image029\"<\/p>\n

Fig. 15.<\/p>\n

\"Image031\"<\/p>\n

Fig. 16. Megaclast exhibiting completely disintegrated bedding.<\/p>\n

Diaz Mart\u00ednez et al.:\u00a0The gravity negative anomaly results from incomplete data measured in the interior of the sedimentary Azuara basin.<\/em><\/strong><\/p>\n

The questions arise: What is the definition of completeness of data in geophysics? And: What actually is the kind of geophysical considerations that led the impact opponents to the assertion that the data are incomplete? In other words: The curious argumentation by the impact opponents lacks any objectivity and is based on impressions only. The Azuara gravity campaign has been performed by K. Ernstson, who, since 30 years, is familiar with gravity measurements and with geophysics of impact structures (Ries, Rochechouart, Steinheim) in general (see, e.g., Ernstson, 1972, 1974, 1976; Pohl et al., 1977, 1978; Ernstson, 1982, 1984 a, b, Ernstson and Pohl, 1974, 1977; Ernstson and Diele, 2003).<\/p>\n

Assertions like these, without presenting any data and observations, reveal the style of argumentation of the impact opponents, which has already been denounced by F. Claudin in his comment on the article of Cort\u00e9s et al. (2002) (see\u00a0http:\/\/www.estructuras-de-impacto.impact-structures.com\/spain\/controversy\/newpubli.htm<\/a>, comentario sobre el art\u00edculo publicado en MAPS por Cort\u00e9s et al., 2002).<\/p>\n

Diaz Mart\u00ednez. et al.:\u00a0Cort\u00e9s and Casas (1996) consider Azuara consistent with a regional N-S shortening in the Tertiary. For these authors, the structure is a syncline.<\/em><\/strong><\/p>\n

So what? The impact advocates have never doubted the action of Alpidic tectonics in the Azuara zone. But according to their observations (Ernstson et al., 2002; and others), Azuara is an impact structure. A regional shortening, in whatever direction, is incapable to explain the moderate to strong shock effects in the Pelarda Fm., the breccia dikes containing moderately to strongly shocked clasts, the megabreccias, the dislocated megablocks, the monomictic movement breccias extensive over hundreds of meters, the suevite breccias, and more.<\/p>\n

Diaz Mart\u00ednez et al.:\u00a0The proposed ejecta layer (Pelarda Fm.) of the Azuara structure is overlaying the deposits of the adjacent Calatayud-Montalb\u00e1n basin. Traditionally, the Pelarda Fm. has been interpreted as an alluvial Plio-\/Pleistocene sedimentary cover. Diaz et al (2002) interpret the Pelarda Fm. as a local Plio-\/Pleistocene alluvial deposit similar to others located along zones of large relief in Spain.<\/em><\/strong><\/p>\n

The Pelarda Fm. ejecta are in a clear manner interstratified between Eocene and Miocene materials. This can be verified in the environs of Salcedillo (coordinates 30667259E\/4535565N, at an altitude of ~1250 m; Figs. 17, 18). Therefore, considering the Pelarda Fm. as a local Plio-\/Pleistocene deposit does not make any sense. As the term \u00abtraditionally\u00bb obviously refers to previous age determination, it is worth mentioning that the Pelarda Fm. has so far been dated between Eocene and Oligocene (Adrover, 1982; Carls & Monninger, 1974; Ernstson & Claudin, 1990; Ernstson and Fiebag, 1992; Ernstson et al; 2002) and Quaternary (Lend\u00ednez et al., 1989; P\u00e9rez, 1989; Ferreiro et al., 1991; Aurel et al., 1993; Aurell, 1994; Cort\u00e9s y Mart\u00ednez, 1999; Cort\u00e9s et al., 2002; Diaz et al., 2002). Moreover, the Pelarda Fm. has been interpreted either als fluvial (Carls & Monninger, 1976; Adrover, 1982; Smit, 2000), or impact ejecta (Ernstson & Claudin, 1990; Ernstson et al., 2002), or alluvial (Lend\u00ednez et al., 1989; P\u00e9rez, 1989; Ferreiro et al., 1991; Aurel et al., 1993; Aurell, 1994; Cort\u00e9s y Mart\u00ednez, 1999; Cort\u00e9s et al., 2001; Diaz et al., 2002).<\/p>\n

\"Image033\"<\/p>\n

Fig. 17. The Pelarda Fm. ejecta near Salcedillo, interstratified between Eocene and Miocene materials.<\/p>\n

\"Image035\"<\/p>\n

Fig. 18. Closer view of the Pelarda Fm. ejecta near Salcedillo. Not a complex style of deposition similar to that in Figs. 14, 15.<\/p>\n

As mentioned earlier (Ernstson & Claudin, 1990; Ernstson et al., 2002), the occurrence of striated clasts (the striae oriented NE-SW, that is pointing to the centers of the Azuara and Rubielos de la C\u00e9rida structures), rotated fractures, clear evidence of moderate to strong shock metamorphism (PDFs) in cobbles and boulders of B\u00e1mbola and Armorican quartzite, the exposition at the top of one of the highest mountain chain in the region, and more, exclude a formation by \u00abnormal\u00bb sedimentation as proposed in the paper under discussion (Diaz Mart\u00ednez et al., 2002). More can be read here\u00a0ejecta<\/a>.<\/p>\n

Diaz Mart\u00ednez et al.:\u00a0The ejecta from an impact structure are for the most part deposited within about one crater radius beyond the rim (a non-oblique trajectory provided).<\/em><\/strong><\/p>\n

Here, we simply remind of the Belize ejecta from the Chicxulub impact structure. The diamictites interpreted as basal mass flow occur up to a quadruple (!) crater radius (Pope et al, 1999; Ocampo et al., 2000), and then disappear. In the case of the Azuara impact, the Pelarda Fm. ejecta occur up to a distance of no more than twice the crater radius. Hence, this argument, also used by Cort\u00e9s et al. (2001) to refuse the impact origin for the Pelarda Fm., is absolutely out of place. At that time (see the reply [by F. Claudin] to the paper of Cort\u00e9s et al. on\u00a0www.estructuras-de-impacto.impact-structures.com<\/a>), this discrepancy was perfectly obvious, and we didn’t further pay attention to it. Now being again quoted, we point to this untenable argument.<\/p>\n

Diaz Mart\u00ednez et al.:\u00a0According to Langenhorst and Deutsch (1996) and a personal communication by Langenhorst (2000), the deformation structures proposed as evidence of shock metamorphism are not related with impact metamorphism.<\/em><\/strong><\/p>\n

Back to the same old story (see comment on the article of Cort\u00e9s et al. (2002), published in MAPS, written by F. Claudin on\u00a0http:\/\/www.estructuras-de-impacto.impact-structures.com\/spain\/controversy\/newpubli.htm<\/a>): An opinion lacking any support by solid and checkable evidence, is a waste of time. This holds true also, if the opinion is given by a person of some scientific reputation.<\/p>\n

What is the base of Langenhorst’s (2000) assertion that the microscopic deformations are not related with impact metamorphism? If he refers to the only sample they describe in more detail in their article (Langenhorst & Deutsch; 1996), a direct confrontation is given:<\/p>\n

In a letter to A. Deutsch, K. Ernstson described the sample to be from\u00a0autochthonous rocks outside<\/em><\/strong>\u00a0the Azuara structure and suggested the planar features in this sample to be probably basal deformation lamellae (and not PDFs!). Ignoring these hints, Langenhorst and Deutsch nevertheless submitted the paper with the misleading results and the assertion that there is no shock in Azuara, and categorically refused to withdraw it, even when K. Ernstson had insistently protested. Moreover, in the paper of Langenhorst and Deutsch, absolutely no reference is given to the report [Ernstson et al., (1985), Ernstson & Fiebag (1992), and Ernstson (1994)] of strong shock (PDFs, diaplectic glass) in\u00a0polymictic dike breccias from within<\/em><\/strong>\u00a0the Azuara structure. This \u00abnice loyalty to a colleague\u00bb was the reason that K. Ernstson reproached Langenhorst and Deutsch with scientific dishonesty. Diaz-Mart\u00ednez et al., and other impact opponents (e.g., Cortes et al., 2002), continue to adopt the misleading results and the scientific dishonesty.<\/p>\n

Among the three specimens, Deutsch and Langenhorst had in hand, only one had originated from the Pelarda Fm. ejecta (which displayed PFs and no PDFs). It is well known that PDFs are in general rather discontinuously distributed in shocked rocks and that an adequate number of samples must be analyzed. How is that possible, without having ever put their foot on Azuara terrain, to infer from only three samples from outside the impact structure that there is no shock in Azuara?<\/p>\n

In addition to the early analysis by Ernstson et al. (1985), PDF universal-stage analyses have been performed by Eugenio Guerrero (University of Madrid) and by the reputed Ann Therriault (Geological Survey of Canada). All three analyses more or less revealed the same results especially with respect to the dominating {10-13} and {10-12} PDFs. A general confusion?<\/p>\n

More about this Langenhorst & Deutsch quarrel can be read here:\u00a0shock-metamorphism<\/a><\/p>\n

Moreover, today and here we remark: The authors of the article under review, Diaz Mart\u00ednez, E. et al., participated in the informal field trip on occasion of the 2001 Granada IMPACT workshop. They could have taken samples, but where are the analyses?<\/p>\n

Diaz Mart\u00ednez et al.:\u00a0Neither impact melts nor suevites have been reported for the Azuara structure (that is why no ages are available ….)<\/em><\/strong><\/p>\n

Reading this, we are flabbergasted. Impact melts in the Azuara structure have been described in detail by Fiebag (1988), and again in Ernstson and Fiebag (1992; p. 418: 4. High-pressure and high-temperature features), Ernstson and Fiebag (1993, p. 758 ) and Ernstson (1994; pp. 38-41). As already mentioned above, the basal breccia has been described to reveal the typical aspects of a suevite breccia. This has been pointed out in Ernstson and Fiebag (1992, pp.413-414) and Ernstson (1994, p. 45). For the interested reader, we add that meanwhile impact melt rocks and suevites have been reported also for the Rubielos de la C\u00e9rida impact basin (Hradil et al., 2001, Ernstson et al., 2001 a, Ernstson et al., 2002).<\/p>\n

Diaz-Mart\u00ednez et al.:\u00a0Ernstson and Fiebag (1992) suggest an impact age of Late Eocene – Oligocene, because Miocene sediments are not affected by tectonics and because Eocene sediments contribute to the material of some breccia dikes.<\/em><\/strong><\/p>\n

Ernstson and Fiebag (1992) suggest this age with respect to a paleontological dating of gastropodes in sediments unaffected by the impact, and to Eocene sediments incorporated not only into breccia dikes but also into the megabreccia and the continuous ejecta deposits (Pelarda Fm.).<\/p>\n

Conclusion<\/h3>\n

It is an enigma, and we shall never understand why the article under discussion could have \u00absurvived\u00bb the review process refered to above and could have been printed in the Special Paper series of the Geological Society of America. It is the same mystery surrounding the publication of the paper: Cort\u00e9s, A.L., D\u00edaz-Mart\u00ednez, E., Sanz-Rubio, E., Mart\u00ednez-Fr\u00edas, J & Fern\u00e1ndez, C. (2002): Cosmic impact versus terrestrial origin of the Azuara structure (Spain): A review. Meteoritics Planet. Sci., 37: 875-894. (see\u00a0http:\/\/www.estructuras-de-impacto.impact-structures.com\/spain\/controversy\/newpubli.htm<\/a>)<\/p>\n

Obviously, the criteria of publication used by the \u00abarbiters\u00bb are different for both groups. While, of the impact advocates, they request more precision for the location of the outcrops, various inspections and examinations of the microscopic data, references to the articles published by the impact opponents, and much more …. it seems that, of the impact opponents, the \u00abarbiters\u00bb request, if at all, not to make too many editing mistakes only.<\/p>\n

A few years ago, a long article arouse attention, written by Brian Martin and entitled \u00abThe Suppression of Dissent in Science \u00a0(see \u00a0http:\/\/www.uow.edu.au\/~bmartin\/pubs\/99rsppp.html<\/a>). With respect to the Azuara\/Rubielos de la C\u00e9rida \u00abaffair\u00bb, we tend to slightly vary the title to \u00abThe Suppression of Science by Personal Dissent\u00bb.<\/p>\n

References<\/h3>\n

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Sch\u00fcssler, U., Hradil, K., Ernstson, K.(2002): Impact-related melting of sedimentary target rocks of the Rubielos de la C\u00e9rida structure in Spain. Berichte der Deutschen Mineralogischen Gesellschaft, Beiheft 1 zum European Journal of Mineralogy, Vol. 14, S. 149.<\/p>\n

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Zimmerman, A (2003): Rhytmic Layering in the suevite, and reworked \u201cBunte breccia\u201d of the Otting quarry, Otting, Bavaria, Germany: Evidence for a diatremic origin for the Ries Basin, Bavaria, Germany. Seattle Annual meeting (November 2-5), Paper n\u00ba 208-14.<\/p>\n","protected":false},"excerpt":{"rendered":"

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