Sedimentological evolution during the Early Jurassic Fuxian period in Ordos Basin: palaeoclimatic response to Toarcian Oceanic Anoxic Event
LI Changhao1,2, GE Yu1,2, JIN Xin1,2, SHI Zhiqiang1,2
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：As a global geological event,the early Toarcian(Early Jurassic)Oceanic Anoxic Event(T-OAE)(~183.8 Ma)affected both the marine and terrestrial environments. The response of this event had been recorded in the Lower Jurassic Fuxian Formation in the Ordos Basin. Based on the field geological survey,scanning electron microscopy and thin section analysis,we studied the lithology,color changes and sedimentary sequence of the Fuxian Formation in the northeastern Order Basin. Together with the previous research results of literature,we revealed the lithofacies palaeogeography and sedimentary model of the Fuxian period. Our results show that the Ordos Basin had experienced the palaeoclimatic change from wet to drought during the Fuxian period. The white glutenite and black or gray mudstone/shale containing abundant plant fossils deposited in the humid conditions,which corresponds to the filling stage of valleys in the basin. After filling up,the variegated and red mudstone/shale containing few plant fossils deposited in the flat topographical condition during the late Fuxian period,corresponding to an arid climate pulse under the overall humid climate in the Early and Middle Jurassic periods. The changes of rock color and climate are interpreted as the continental response of the T-OAE,which can be used for the isochronous correlation of the Fuxian Formation. We interpret the “coarse Fuxian”was fluvial deposits filling the incised valleys,the “fine Fuxian”deposited in lake or flood plain environments,the “black Fuxian”and “white Fuxian”were sedimentary products of humid climate,while “variegated Fuxian”and “red Fuxian”deposited under drought climate condition after the T-OAE.
LI Changhao,GE Yu,JIN Xin et al. Sedimentological evolution during the Early Jurassic Fuxian period in Ordos Basin: palaeoclimatic response to Toarcian Oceanic Anoxic Event[J]. JOPC, 2022, 24(4): 697-712.
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