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Upper lower triassic stromatolite from Anhui, South China: geobiologic features and paleoenvironmental implications

Luo, Mao, Chen, Zhong-Qiang, Shi, Guang R., Fang, Yuheng, Song, Haijun, Jia, Zhihai, Huang, Yuangeng and Yang, Hao 2016, Upper lower triassic stromatolite from Anhui, South China: geobiologic features and paleoenvironmental implications, Palaeogeography, palaeoclimatology, palaeoecology, vol. 452, pp. 40-54, doi: 10.1016/j.palaeo.2016.04.008.

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Title Upper lower triassic stromatolite from Anhui, South China: geobiologic features and paleoenvironmental implications
Author(s) Luo, MaoORCID iD for Luo, Mao orcid.org/0000-0002-6340-7786
Chen, Zhong-Qiang
Shi, Guang R.ORCID iD for Shi, Guang R. orcid.org/0000-0002-5126-4036
Fang, Yuheng
Song, Haijun
Jia, Zhihai
Huang, Yuangeng
Yang, Hao
Journal name Palaeogeography, palaeoclimatology, palaeoecology
Volume number 452
Start page 40
End page 54
Total pages 15
Publisher Elsevier
Place of publication Amsterdam, The Netherlands
Publication date 2016-06-15
ISSN 0031-0182
Keyword(s) Late early triassic
Stromatolite
Bacteria clumps
Coccoid-like spheroids
Micro-quartz
South China
Summary Widespread stromatolites and other microbialite deposits characterize Lower Triassic marine successions worldwide. This study documents a stromatolite deposit, 1.1. m thick, from the upper Spathian (Lower Triassic) of the Susong area, South China. The stromatolite comprises distinct laminated domes in the basal part and columns at the upper part. Dark laminae are loosely spaced and interlayered with thicker light colored laminae. Diffusive dark colored laminae are composed of peloidal micrite that grade locally into microclotted structures, and yield copies of bacteria clump-like and coccoid-like spheroid aggregates. The former are characterized by cloudy, micrite nuclei rimmed by coarse-grained, euhedral sparry calcite crystals, while the latter are comprised of solid calcite crystal nuclei coated with rather thin micrite envelopes. The cloudy, micrite nuclei resemble bacteria clump-like structures observed in present-day travertine. Both the coccoid-like spheroids and bacteria clump-like structures are surrounded by coarse-grained euhedral calcite crystals, suggesting a similar accretion mechanism. Both spherical structures therefore could be crucial in the accretion of the Susong stromatolite. The laminated/microclotted structures are interpreted as the result of variation in timing of lithification relative to the timing of the decay of microbes. Micro-analysis also unravels the common occurrence of authigenic micro-quartz crystals in association with Fe-bearing illite clay minerals in the stromatolite columns. Their coalescing nature with each other, together with the associated pyrite grains, strongly support the formation of micro-quartz crystals from microbial reduction of an Fe-bearing smectite precursor by sulfate reducing bacteria. A comparison of the Susong stromatolite with its counterparts from the upper Lower Triassic strata in Dajiang, South China reveals many similarities in stromatolite microstructures, suggesting that a harsh, euxinic-anoxic environment resulting in the bloom of sulfate reducing bacteria most likely extended into the latest Spathian in South China.
Language eng
DOI 10.1016/j.palaeo.2016.04.008
Field of Research 0403 Geology
0602 Ecology
0603 Evolutionary Biology
040308 Palaeontology (incl Palynology)
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:30083126

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