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B. K. Bhadra A. K. Gupta J. R. Sharma 《Journal of the Geological Society of India》2009,73(6):875-877
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S. K. Pandey J. P. Shrivastava G. S. Roonwal 《Journal of the Geological Society of India》2010,75(2):441-442
Discussion
Petrography and Mineral Chemistry of Neovolcanics Occurring between Pacific and Nazca Plate Boundaries by S.K. Pandey, J.P. Shrivastava and G.S. Roonwal. Jour. Geol. Soc. India, v.74, 2009, pp.559–572. 相似文献8.
《Gondwana Research》2013,24(4):1656-1658
The abundant and diverse assemblage of filamentous microbial fossils permineralized in the ~ 3465 Ma Apex chert of northwestern Australia — among the oldest records of life — are arguably the “best studied,” by the most workers using the most advanced techniques, in the history of science. Despite the extensive body of data establishing the biogenicity of the demonstrably cellular carbonaceous Apex fossils, Pinti et al. (2013) and Marshall and Marshall (2013) have raised issues regarding the interpretation of their studies of the Apex chert presented in our recent review article (Schopf and Kudryavtsev, 2012). We agree with the assessment of both of the relevant papers by Pinti et al. (2009, 2013): the observations they report do not apply to the bona fide microscopic fossils of the Apex chert. Similarly, like the minute objects reported by Pinti et al. (2009, 2013), the “quartz and haematite-filled fractures” discussed by Marshall and Marshall (2013) are mineralic pseudofossils that are not relevant to interpretation of the Apex fossil microbes and their suggestion that “multiple populations of carbonaceous material may be a wide-spread issue through out the Precambrian” is without merit. 相似文献
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《GeoJournal》1991,23(1):71-72
ReportsInternational Seminar
Photogrammetry and Geographic information systems 8.–12. April 1991 相似文献11.
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《International Geology Review》2012,54(1):123-125
The authors by their own statement do not intend to make a general criticism of the work but which only to point out these specific errors: 1) There is no justification in assigning all the massifs to the junction zone of East and West Sayans. It is incomprehensible to include such dissimilar massifs as the gabbros of Kazyr and the granitic Kryzhin range, both because of age and form; 2) There are no chromite deposits in the West Sayans; 3) The use of an effusive-schist formation in the Upper Proterozoic is incorrect; it should read series; 4) What do Ordovician faults have to do with the Lysansk massifs? 5) There are serious errors and omissions in the petrography of the Lysansk complex, on which the authors elaborate; 6) The TiO2 deposits in gabbros were discovered not in 1956, as claimed, but in 1954 by two other geologists; 7) The sequence of the emergence of secondary minerals from a magmatic melt “can only be visualized;” 8) They object to “superimposing” an autometamorphic phase on the mineralization; 9) They object to the concepts of the origin of Lysansk intrusions, as being “in the dogmatic form of an article of faith.” — M.A. Klugman 相似文献
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AbstractThe third (Es3) member of the Eocene Shahejie Formation is the main hydrocarbon source rock interval in the Raoyang Sag of the Bohai Bay Basin. The lower Es3 (Es3L) and upper Es3 (Es3U) submembers display clear differences in source rock quality. The formation mechanisms of the source rocks are investigated via geochemical methods using 60 samples from three wells to reconstruct the paleo-environment during deposition. The major element parameters exhibit changes in paleoclimate from humid to arid. Indicators such as Sr/Ba, B/Ga, the gammacerane index and isotopic data suggest fresh–brackish and hydrological open lakes with unstable water column stratification likely occurred during deposition of the Es3L submember and saline and hydrologically closed lakes with stable water column stratification likely during deposition of the Es3U submember. Carbon isotope values of organic matter, trace elements and biomarker parameters suggest that the Es3L submember had moderate productivity, with a significant contribution from terrigenous organic matter whereas the Es3U submember had slightly enhanced productivity, with no or minor contributions from terrigenous organic matter. Furthermore, the pristane/phytane ratio and the enrichment of Mo and U indicate that the euxinic bottom-water conditions (sulfidic) of the lakes during deposition of the Es3U submember were best for preserving organic matter. Comparison of the models of source rock deposition of the Es3L and Es3U submembers indicates that the redox conditions play an important role in the formation of organic-rich source rocks in the Raoyang Sag. 相似文献