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Middle Permian palaeobiogeography study in East Kunlun, A’nyêmaqên and Bayan Har

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Abstract

Three regions can easily be identified in the study area according to the Middle Permian palaeobiogeographic distribution of biota, they are the southern slope of East Kunlun, A’nyêmaqên and Bayan Har. Biotic constitution and ecology in the southern slope of East Kunlun and Bayan Har are very similar. Both the diversity and abundance of organisms in these two areas are very high and reefs are widely developed. However, biotic diversity and abundance in A’nyêmaqên which is between the above two areas are obviously low. Differentiation of palaeobiogeographic distribution in these areas should be due to the baring of A’nyêmaqên ocean in the time of Middle Permian. Middle Permian radiolarian chert and thick abyssal red ooze are widely spread in A’nyêmaqên, implying that the A’nyêmaqên ocean had a great scale in size. Vast scale of deep ocean basin became an impassable gulf for some of the benthos, and as a result, only part of the organisms could have the chance to get to the isolated islands situated in ocean basin. Small living space and hard conditions in the islands further limited the abundance and diversity of biota. Tectonic background reflected by the geochemical study of basalt in the three areas is coupling well enough with the palaeobiogeographic division.

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Authors and Affiliations

  1. Faculty of Earth Science, China University of Geosciences, 430074, Wuhan, China

    Wang Yongbiao & Yang Hao

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  1. Wang Yongbiao
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  2. Yang Hao
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Correspondence to Wang Yongbiao.

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Wang, Y., Yang, H. Middle Permian palaeobiogeography study in East Kunlun, A’nyêmaqên and Bayan Har. Sci. China Ser. D-Earth Sci. 47, 1120–1126 (2004). https://doi.org/10.1360/02yd0450

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  • DOI: https://doi.org/10.1360/02yd0450

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