Journal ArticleDOI
Palaeoenvironmental significance of organic facies and stable isotope signatures: the Ladinian San Giorgio Dolomite and Meride Limestone of Monte San Giorgio (Switzerland, WHL UNESCO)
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In this article, the over 600m thick Ladinian carbonate section of Monte San Giorgio (World Heritage List, United Nations Educational, Scientific and Cultural Organization, Switzerland), including the San-Giorgio Dolomite and the Meride Limestone, was analysed with respect to its sedimentology, organic-matter content (Rock-Eval and palynofacies) and stable carbon and oxygen-isotope composition.Abstract:
The over 600 m thick Ladinian carbonate section of Monte San Giorgio (World Heritage List, United Nations Educational, Scientific and Cultural Organization, Switzerland), including the San Giorgio Dolomite and the Meride Limestone, was analysed with respect to its sedimentology, organic-matter content (Rock-Eval and palynofacies) and stable carbon and oxygen-isotope composition. Application of geochemical proxies and optical data (transmitted light microscopy, epifluorescence, cathodoluminescence and scanning electron microscopy) allowed the assessment of the relative sea-level trend and the characterization of the organic-matter content. Three main organic-matter assemblages were defined according to their composition and stratigraphic position. Overall, results suggest immature organic matter, predominantly of marine bacterial origin with an upsection-increasing land plant-derived contribution. Forcing factors controlling organic-matter accumulation include changes in sea-level, productivity and runoff which, in turn, were probably promoted by periods of rainfall following explosive volcanic activity. Enhanced productivity during sea-level highstands is considered to have played a key role in black-shale formation under anoxic–sulphidic conditions (mainly in the Besano Formation). In contrast, sea-level lowstands, coupled with intensified runoff, resulted in increased basin restriction and in deposition of laminated limestone, mainly under lower dysoxic to anoxic conditions (chiefly in the Lower Meride Limestone). Under the latter conditions, benthic microbial activity produced most of the hydrogen-rich organic matter, contributed to carbonate precipitation and also played a major role in taphonomic control on vertebrate fossil preservation. In more general terms, the Monte San Giorgio section proved to be an excellent testing ground, making it possible to compare diverse approaches with each other and, more specifically, to relate optical evidence to geochemical signatures.read more
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Carbonate reticulated ridge structures from the lower middle triassic of the luoping area, yunnan, SouthWestern China: Geobiologic features and implications for exceptional preservation of the luoping biota
Mao Luo,Mao Luo,Zhong-Qiang Chen,Shixue Hu,Qiyue Zhang,Michael J. Benton,Changyong Zhou,Wen Wen,Jinyuan Huang +8 more
TL;DR: In this article, the preservation of carbonate reticulated ridge structures is documented from the lower Middle Triassic Guanling Formation of the Luoping area, eastern Yunnan Province, southwestern China.
Journal ArticleDOI
New holostean fishes (Actinopterygii: Neopterygii) from the Middle Triassic of the Monte San Giorgio (Canton Ticino, Switzerland)
TL;DR: The new neopterygian genus Ticinolepis, including two new species T. longaeva and T. crassidens, is described from Middle Triassic carbonate platform deposits of the Monte San Giorgio and shows interesting patterns of intraspecific variation including ontogenetic changes and morphological variation over time.
Journal ArticleDOI
Diversity and factors controlling widespread occurrence of syn-rift Ladinian microbialites in the western Tethys (Triassic Catalan Basin, NE Spain)
TL;DR: In this paper, the authors analyzed three types of lamina couplets, i.e., stromatolites, ooidal-muddy microbial laminites and thrombolites, on the basis of their geometry, lamination and textural attributes.
Journal ArticleDOI
Taphonomic analysis of Saurichthys from two stratigraphic horizons in the Middle Triassic of Monte San Giorgio, Switzerland
Susan R. Beardmore,Heinz Furrer +1 more
TL;DR: In this article, a taphonomic study was performed using the actinopterygian Saurichthys, a relatively abundant taxon found in the Besano Formation (latest Anisian-earliest Ladinian) and Cassina Beds of the Meride Formation (early Ladinian).
Journal ArticleDOI
Stratigraphic Definition and Correlation of Middle Triassic Volcaniclastic Facies in the External Dinarides: Croatia and Bosnia and Herzegovina
Duje Smirčić,Tea Kolar-Jurkovšek,Dunja Aljinović,Uroš Barudžija,Bogdan Jurkovšek,Hazim Hrvatović +5 more
TL;DR: In this article, three localities in the External Dinarides: Donje Pazariste, Bosansko Grahovo and Zelovo were biostratigraphically analysed. But the results of these localities are limited.
References
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Book
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Journal ArticleDOI
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Journal ArticleDOI
87 Sr/ 86 Sr,δ 13 Candδ 18 Oevolution of Phanerozoic seawater
Ján Veizer,Davin Ala,Karem Azmy,Peter Bruckschen,Dieter Buhl,Frank Bruhn,Giles A.F. Carden,Andreas Diener,Stefan Ebneth,Yves Goddéris,Torsten Jasper,Christoph Korte,Frank Pawellek,Olaf G. Podlaha,Harald Strauss +14 more
TL;DR: In this article, a total of 2128 calcitic and phosphatic shells, mainly brachiopods with some conodonts and belemnites, were measured for their δ 18 O, δ 13 C and 87 Sr / 86 S values.
Journal ArticleDOI
Méthode rapide de caractérisation des roches mètres, de leur potentiel pétrolier et de leur degré d'évolution
TL;DR: In this article, a methode and an appareillage adaptes a l'exploration petroliere are presented, and the methode convient particulierement bien a léestimation du rendement en huile des roches bitumineuses.
Journal ArticleDOI
Desiccation tolerance of prokaryotes.
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