Stratigraphy of the Triassic-Jurassic Boundary Successions of the Southern Margin of the Junggar Basin, Northwestern China
作者： Jingeng SHA , Vivi VAJDA , Yanhong PAN , Linda LARSSON , Xiaogang YAO
DOI: 10.1111/J.1755-6724.2011.00410.X
关键词:
摘要: The Triassic-Jurassic (Tr-J) boundary marks a major extinction event, which (similar to 200 Ma) resulted in global extinctions of fauna and flora both the marine terrestrial realms. There prevail great challenges determining exact location Tr-J boundary, because endemism of. : scarcity fossils settings leading difficulties linking sedimentary successions. Investigation based on palynology bivalves has been carried out over 1113 m thick section, is subdivided into 132 beds, along Haojiagou valley southern margin Junggar Basin northern Xinjiang, northwestern China. Lower Jurassic conformably resting Upper Triassic strata. covers Huangshanjie Formation overlaid by Formation, while comprises Badaowan followed Sangonghe Formation. Fifty six pollen spore one algal were identified from sediments. Based key-species abundance spores pollen, three zones erected: Late (Rhaetian) Aratrisporites-Alisporites Assemblage, Early (Hettangian) Perinopollenites-Pinuspollenites Sinemurian Perinopollenites-Cycadopites Assemblage. placed between bed 44 45 coincident with formations. Beds Ferganoconcha (?), Unio-Ferganoconcha id Waagenoperna-Yananoconcha bivalve assemblages are recognized. (?) limited upper present middle members succession interpreted as two mainly lake deposit intervals within formations, yielding fresh water algae bivalves. However, presence brackish Tasmanites marine-littoral facies Waagenoperna indicate that was influenced sea caused transgressions Tethys, during Sinemurian.
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