Sedimentary Sequences and Implications for Paleoenvironment of Cenozoic Lacustrine Stromatolites, Qaidam Basin

Abstract

Abstract:

Climate, sedimentary environment and lake level are the major factors that intervene the growth of stromatolites directly or indirectly. Correspondingly, stromatolites are certain qualitative indicators for the controlling factors. Comparisons of vertical bedding position and basic sedimentary sequences are made between the two Cenozoic lacustrine stratigraphic sections, Changweitai and Xichagou section in western Qaidam Basin. We identified two Cenozoic high lake-level periods in Qaidam Basin when these stromatolites were thriving, even in adjacent Cenozoic basins in Qinghai-Tibetan Plateau. This might indicate large-scale regional humid climate in Miocene, when strong precipitation and evaporation went simultaneously or alternatively. Four types of basic sedimentary sequences containing stromatolites are proposed, and the stromatolites can develop on the surface of the clay stone or sandstone and conglomerate hard ground. On the top of stromatolitic layer are the fine siliciclastic sediments or sedimentary gap, indicating that the growth of stromatolites follow the minor flooding surface and the sudden rise of relative lake surface.

Key words: lacustrine stromatolite, sedimentary sequence, Miocene, high-level lake period, Qaidam Basin

CLC Number:

ZENG Lingqi, YI Haisheng, XIA Guoqing, YUAN Tao. Sedimentary Sequences and Implications for Paleoenvironment of Cenozoic Lacustrine Stromatolites, Qaidam Basin[J]. Geoscience, 2017, 31(06): 1251-1260.

Figures/Tables 5

Fig.1 Remote sensing image of stromatolite-bearing basins in Qinghai-Tibetan Plateau

Fig.2 Eocene-Miocene sedimentary environment and stromatolitic sequences position contrast between Xichagou and Changweitai sections, western Qaidam Basin (the stratigraphic age after Song[18])

Fig.3 Micro-characteristics of Cenozoic lacustrine stromatolites in Western Qaidam Basin

Fig.4 Horizontal section of stromatolite sample from Upper Ganchaigou Group, Changweitai area

Fig.5 Four kinds of typical sedimentary sequence columns of lacustrine stromatolites, Qaidam Basin

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