Unusual shallow marine matground-adapted benthic biofacies from the Lower Triassic of the northern Paleotethys: implications for biotic recovery following the end-Permian mass extinction

Feng, Xueqian, Chen, Zhong-Qiang, Bottjer, David J., Wu, Siqi, Zhao, Laishi, Xu, Yaling, Shi, G.R., Huang, Yuangeng, Fang, Yuheng and Tu, Chenyi 2018, Unusual shallow marine matground-adapted benthic biofacies from the Lower Triassic of the northern Paleotethys: implications for biotic recovery following the end-Permian mass extinction, Earth-science reviews, doi: 10.1016/j.earscirev.2018.07.012.

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Title Unusual shallow marine matground-adapted benthic biofacies from the Lower Triassic of the northern Paleotethys: implications for biotic recovery following the end-Permian mass extinction
Author(s) Feng, Xueqian
Chen, Zhong-Qiang
Bottjer, David J.
Wu, Siqi
Zhao, Laishi
Xu, Yaling
Shi, G.R.ORCID iD for Shi, G.R. orcid.org/0000-0002-5126-4036
Huang, Yuangeng
Fang, Yuheng
Tu, Chenyi
Journal name Earth-science reviews
Total pages 26
Publisher Elsevier
Place of publication Amsterdam, The Netherlands
Publication date 2018-07-27
ISSN 0012-8252
Summary © 2018 Elsevier B.V. We report two shallow marine, ichnofauna-bivalve-microbial mat biofacies from the Lower Triassic Xiahuancang Formation of the southern Qilian area, Qinghai Province, northwestern China, which was located at moderate-high paleolatitudes on the northern margin of the Paleotethys Ocean. Paleoenvironmental analyses show that Members I and II of the Xiahuancang Formation represent a shoreface and a lower shoreface to offshore transition setting, respectively. Biofacies 1, recognized from Member I, is characterized by a diverse ichnofauna (including deep-tiers of Rosselia and Diplocraterion), Claraia-dominated bivalves, and microbially induced sedimentary structures (MISSs). Biofacies 2, in succeeding Member II, is dominated by a diverse ichnofauna, epifaunal and shallow infaunal bivalves, and wrinkle structures. Primary co-occurrences, preservational features, and palimpsest or crosscutting relationships of all components within the biofacies indicate that microbial mats, bivalves, and trace-makers actively interacted with one another during deposition. They largely represent contemporaneous biotic associations. Microbial mats are interpreted to have grown under well-oxygenated conditions after storm deposition due to the association of deep-tiering infauna and diverse epifauna as well as well-developed cross-stratification, and the top layer of microbial mats could serve as an oasis for metazoans. Microbial mats not only proliferated in harsh environments, but also coexist with epifauna and deep-tiering infauna in well-oxygenated settings following the end-Permian crisis. Their occurrences in the Early Triassic are unrelated to environmental stresses, which are coincident with their sedimentologic record from other geological time intervals. Apparently, the southern Qilian ichnofauna-bivalve-microbial mat biofacies with juxtaposed epifauna, infauna and MISS- or wrinkle-related microbial mats represents a matground-adapted benthic metazoan ecosystem in the earliest Triassic, which provided sufficient oxygen, food, and other hydrodynamic conditions hospitable for metazoans and ecosystems to recover and reached a fairly high level (recovery stage 3) in a tough time when most biotas suffered biotic depletion and environmental stress. The biotic components in unique biofacies may represent a phase shift community in siliciclastic settings during the Early Triassic.
Notes In Press
Language eng
DOI 10.1016/j.earscirev.2018.07.012
Field of Research 04 Earth Sciences
HERDC Research category C1 Refereed article in a scholarly journal
ERA Research output type C Journal article
Grant ID NSFC 41772007,
NSFC 41661134047,
NSFC 41572091
China Scholarship Council (2017CFA019)
Copyright notice ©2018, Elsevier B.V.
Persistent URL http://hdl.handle.net/10536/DRO/DU:30113300

Document type: Journal Article
Collection: School of Life and Environmental Sciences
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