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Proliferation of MISS-related microbial mats following the end-Permian mass extinction in the northern Paleo-Tethys: evidence from southern Qilianshan region, western China

Xu, Yaling, Chen, Zhong-Qiang, Feng, Xueqian, Wu, Siqi, Shi, G.R. and Tu, Chenyi 2016, Proliferation of MISS-related microbial mats following the end-Permian mass extinction in the northern Paleo-Tethys: evidence from southern Qilianshan region, western China, Palaeogeography, palaeoclimatology, palaeoecology, vol. 474, pp. 198-213, doi: 10.1016/j.palaeo.2016.04.045.

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Title Proliferation of MISS-related microbial mats following the end-Permian mass extinction in the northern Paleo-Tethys: evidence from southern Qilianshan region, western China
Author(s) Xu, Yaling
Chen, Zhong-Qiang
Feng, Xueqian
Wu, Siqi
Shi, G.R.ORCID iD for Shi, G.R. orcid.org/0000-0002-5126-4036
Tu, Chenyi
Journal name Palaeogeography, palaeoclimatology, palaeoecology
Volume number 474
Start page 198
End page 213
Total pages 16
Publisher Elsevier
Place of publication Amsterdam, The Netherlands
Publication date 2016-05-15
ISSN 0031-0182
1872-616X
Keyword(s) sand crack
earliest Triassic
shoreface environment
northern Paleo-Tethys Ocean
southern Qilianshan
western China
Summary As a consequence of the end-Permian mass extinction, microbes proliferated in the post-extinction shallow marine ecosystems, in which they grew as various microbially induced sedimentary structures (MISSs) in siliciclastic settings. This paper reports, for the first time, the discovery of abundant MISSs from the lowest Triassic sandstones of shallow-water margin origin in the Zhihema sections of the southern Qilianshan region, West China. The sandstones are characterized by well-developed cross-beddings and ripple marks, and a Claraia-dominated bivalve assemblage of middle-late Griesbachian age. These sedimentary structures, together with the bivalves, suggest a high-energy peritidal zone of a shoreface setting in a clastic shallow sea environment. Seven types of MISSs are recognized and described here: pictograph-like sand cracks/crack-fills, polygonal sand crack-fills, erosional remnants, multidirectional linear grooves, sinuous crack-fills, fusiform sand cracks/crack-fills, and leveled ripple marks. Most of the newly found MISSs are morphologically comparable with their ancient and modern counterparts. Detailed optical microscope and scanning electron microscope (SEM) analyses reveal that thin clayey laminae and filamentous mica grains are aligned parallel to bedding plane, and that the matrix-supported quartz grains, overall, are oriented; both of which are interpreted to indicate biogenic origin. The biogenic origin of these MISSs is reinforced by the presence of copious putative nanoglobules and filamentous biofilm-like organic objects in the interspaces of clay minerals in laminated layers. These nanometer-scale objects are interpreted as bacterial bodies or remains that have been replaced with inorganic minerals upon fossilization. The presence of MISSs on the northern margins of Paleo-Tethys indicates that the post-extinction microbial mats had expanded their distributions from low-latitude to moderate-high latitude regions. Moreover, unlike some previously reported microbial mats that contain very rare body and trace fossils, the southern Qilianshan MISSs were found in association with abundant vertical burrows and bivalves, suggesting that the MISS-forming microbial mats may have served as oases for trace-making organisms and opportunistic bivalves to flourish in shallow-marine habitats immediately after the end-Permian mass extinction.
Language eng
DOI 10.1016/j.palaeo.2016.04.045
Field of Research 040308 Palaeontology (incl Palynology)
0403 Geology
0602 Ecology
0603 Evolutionary Biology
Socio Economic Objective 970104 Expanding Knowledge in the Earth Sciences
HERDC Research category C1 Refereed article in a scholarly journal
ERA Research output type C Journal article
Copyright notice ©2016, Elsevier
Persistent URL http://hdl.handle.net/10536/DRO/DU:30088786

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