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Ichnofabrics and Sedimentary Environments of Middle and Lower Members of Middle Triassic Ermaying Formation in Jiyuan, West Henan Province
被引：1
|作者：
Xing Z.
[1
,2
]
Xu X.
[1
]
Qi Y.
[1
,2
]
Zheng W.
[1
,2
]
Li W.
[1
]
Wu P.
[1
]
Zhang X.
[1
]
机构：
[1] School of Resources and Environment, Henan Polytechnic University, Jiaozuo
[2] Henan Province Key Laboratory of Biogenic Traces and Sedimentary Minerals, Jiaozuo
来源：
关键词：
environmental geology;
ichnofabric;
Middle Triassic;
sedimentary environments;
sedimentology;
West Henan Province;
D O I：
10.3799/dqkx.2021.251
中图分类号：
学科分类号：
摘要：
Abundant terrestrial ichnofossils were recovered from the middle and lower members of the Middle Triassic Ermaying Formation in Jiyuan area, West Henan Province. A total of 7 ichnogenera and 9 ichnospecies have been found and identified, including Skolithos linearis, Palaeophycus tubularis, Palaeophycus alternatus, Scoyenia gracilis, Planolites beverleyensis, Planolites montanus, Taenidium barretti, Didymaulichnus roualti and rhizoliths. According to the pattern, composition and distribution of ichnofossils, five kinds of ichnofabrics have been discriminated: (1) Skolithos ichnofabric represents the fluvial or shore lacustrine sedimentary environment with mud, fine sand deposits; (2) Palaeophycus-Planolites ichnofabric appears in the sedimentary environment of low-medium hydropower fluvial embankment or lacustrine mudflat deposits; (3) Scoyenia ichnofabric forms in the periodically submerged flood plain sedimentary environment; (4) Taenidium ichnofabric emerges from the flood plain environment under semi-arid climate; (5) rhizoliths ichnofabric preserves from embank oroverbank environment under semi-arid climate conditions. Based on the ichnofabrics and sedimentary characteristics, fluvio-lacustrine strata are dominant in the middle and lower members of the Ermaying Formation. From bottom to top, braided stream-meandering river-lacustrine deposits were formed successively. It can be divided into six sedimentary subfacies: meandering channel subfacies, embankment subfacies, overbank subfacies, braided channel subfacies, floodplain subfacies and shore lacuetrine subfacies. The whole sedimentary period is characterized by alternation of humid and semi-arid, with the transformation from reduction environment to oxidation environment. © 2023 China University of Geosciences. All rights reserved.
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页码：4279 / 4294
页数：15
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