Enlightment of fish coprolites characteristics on lake ecosystem in Early Jurassic Toarcian: taking the Da’anzhai Member in northeast Sichuan Basin as an example
Zhou Xiao-Mei1, Jin Xin1,2, Wu Qiang-Wang1, Ge Yu1, Shi Zhi-Qiang1,2
1 Institute of Sedimentary Geology,Chengdu University of Technology,Chengdu 610059,China; 2 State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation,Chengdu University of Technology, Chengdu 610059,China
Abstract：The Toarcian oceanic anoxic event(T-OAE,Early Jurassic)was an episode of profound environmental changes marked by a global carbon-cycle perturbation,marine mass extinctions,and black-shale deposits. Morphological description and inclusion analysis of fish coprolites collected from the Da’anzhai Member of the Lower Jurassic Ziliujing Formation in the northeast Sichuan Basin were carried out in this paper. We found that the interior of coprolites is composed of abundant organic matters,silts,incomplete clay minerals,phosphorous fossils,undigested fish bone,and a large number of ostracods. According to the morphology and microscopic examination of the coprolites,we speculate that they originated from lungfish. The fish coprolites were deposited in an intermediate to deep lake. During the Da’anzhai depositional period,the surface water of the Sichuan lake was enriched in oxygen,and the lake ecological system was healthy. The bottom of the lake was characterized by deposits of black shale,which implies an anoxic and reducing environment. The T-OAE fish coprolites may suggest a stratified water column in a Toarcian lake. The above results may provide a basis for the study of sedimentary response and ecological impact in the lake of Toarcian oceanic anoxic events of early Jurassic.
Zhou Xiao-Mei,Jin Xin,Wu Qiang-Wang et al. Enlightment of fish coprolites characteristics on lake ecosystem in Early Jurassic Toarcian: taking the Da’anzhai Member in northeast Sichuan Basin as an example[J]. JOPC, 2021, 23(3): 600-609.
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