Palynology of the marine Middle Triassic in the SW Germanic Basin (Upper Muschelkalk, Luxembourg): Evidence for an important latest Anisian-early Ladinian sea-level lowstand

PalZ ◽  
2003 ◽  
Vol 77 (1) ◽  
pp. 195-202 ◽  
Author(s):  
Adam Vecsei ◽  
Raymond Rauscher ◽  
Karsten Hohage
Keyword(s):  
Sea Level ◽  
Middle Triassic ◽  
Germanic Basin ◽  
Upper Muschelkalk

Paleoclimate and sea level response to orbital forcing in the Middle Triassic of the eastern Tethys

2021 ◽  
pp. 103454
Author(s):  
Dongyang Liu ◽  
Chunju Huang ◽  
David B. Kemp ◽  
Mingsong Li ◽  
James G. Ogg ◽  
...  
Keyword(s):  
Sea Level ◽  
Middle Triassic ◽  
Orbital Forcing ◽  
And Sea Level

scholarly journals Late Anisian microbe-metazoan build-ups ('stromatolites') in the Germanic Basin — aftermath of the Permian — Triassic Crisis

2021 ◽  
Author(s):  
Yu Pei ◽  
Jan-peter Duda ◽  
Jan Schoenig ◽  
Cui Luo ◽  
Joachim Reitner
Keyword(s):  
Microbial Mats ◽  
Middle Triassic ◽  
Ecological Niches ◽  
Carbon And Oxygen Isotopes ◽  
Germanic Basin ◽  
Sulfate Reducing ◽  
Mutualistic Relationship ◽  
Relative Rarity ◽  
Geochemical Analyses ◽  
Reducing Bacteria

The so-called Permian — Triassic mass extinction was followed by a prolonged period of ecological recovery that lasted until the Middle Triassic. Triassic stromatolites from the Germanic Basin seem to be an important part of the puzzle, but have barely been investigated so far. Here we analyzed late Anisian (upper Middle Muschelkalk) stromatolites from across the Germanic Basin by combining petrographic approaches (optical microscopy, micro X-ray fluorescence, Raman imaging) and geochemical analyses (sedimentary hydrocarbons, stable carbon and oxygen isotopes). Paleontological and sedimentological evidence, such as Placunopsis bivalves, intraclasts and disrupted laminated fabrics, indicate that the stromatolites formed in subtidal, shallow marine settings. This interpretation is consistent with δ13Ccarb of about -2.1 % to -0.4 %. Occurrences of calcite pseudomorphs after gypsum suggest slightly evaporitic environments, which is well in line with the relative rarity of fossils in the host strata. Remarkably, the stromatolites are composed of microbes (perhaps cyanobacteria and sulfate reducing bacteria) and metazoans such as non-spicular demosponges, Placunopsis bivalves, and/or Spirobis-like worm tubes. Therefore, these ″stromatolites″ should more correctly be referred to as microbe-metazoan build-ups. They are characterized by diverse lamination types, including planar, wavy, domal and conical ones. Microbial mats likely played an important role in forming the planar and wavy laminations. Domal and conical laminations commonly show clotted to peloidal features and mesh-like fabrics, attributed to fossilized non-spicular demosponges. Our observations not only point up that non-spicular demosponges are easily overlooked and might be mistakenly interpreted as stromatolites, but also demonstrate that microbe-metazoan build-ups were widespread in the Germanic Basin during Early to Middle Triassic times. In the light of our findings, it appears plausible that the involved organisms benefited from elevated salinities. Another (not necessarily contradictory) possibility is that the mutualistic relationship between microbes and non-spicular demosponges enabled these organisms to fill ecological niches cleared by the Permian — Triassic Crisis. If that is to be the case, it means that such microbe-metazoan associations maintained their advantage until the Middle Triassic.

Middle Triassic lake deepening in the Ordos Basin of North China linked with global sea-level rise

2021 ◽  
pp. 103670
Author(s):  
Xin Jin ◽  
Viktória Baranyi ◽  
Marcello Caggiati ◽  
Marco Franceschi ◽  
Corey J. Wall ◽  
...  
Keyword(s):  
Sea Level Rise ◽  
Sea Level ◽  
North China ◽  
Middle Triassic ◽  
Ordos Basin ◽  
The Ordos Basin ◽  
Global Sea Level

Middle Triassic conodont assemblages from the Germanic Basin: implications for multi-element taxonomy and biogeography

2018 ◽  
Vol 17 (5) ◽  
pp. 359-377 ◽  
Author(s):  
Yanlong Chen ◽  
Frank Scholze ◽  
Sylvain Richoz ◽  
Zhifei Zhang
Keyword(s):  
Middle Triassic ◽  
Germanic Basin
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