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Stratigraphy of the Triassic-Jurassic Boundary Successions of the Southern Margin of the Junggar Basin, Northwestern China
Sha JinGeng (沙金庚)1; Vajda, Vivi2; Pan Yanhong (泮燕红)1; Larsson, Linda2; Yao Xiaogang (姚小刚)1; Zhang Xiaolin1; Wang Yaqiong (王亚琼)1; Cheng Xiansheng3; Jiang Baoyu4; Deng Shenghui5; Chen Siwei (陈澌苇)1; Peng Bo1
2011-04-01
Source PublicationACTA GEOLOGICA SINICA-ENGLISH EDITION
ISSN1000-9515
Volume85Issue:2Pages:421-436
Abstract

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

KeywordBiostratigrapy Triassic-jurassic Hettangian-sinemurian Palynology Bivalve Haojiagou Of Junggar Basin Northwestern China
Language英语
WOS KeywordSea-level Change ; Mass Extinction ; Facies Changes ; Sedimentology ; Australia ; Austria ; Events ; Sweden ; Record ; Faunas
Funding ProjectMinistry of Science and Technology of China[2006FY120300] ; National Committee of Stratigraphy of China ; Swedish Research Council (VR)[2007-4509]
WOS Research AreaGeology
WOS SubjectGeosciences, Multidisciplinary
WOS IDWOS:000289845800015
Funding OrganizationMinistry of Science and Technology of China ; National Committee of Stratigraphy of China ; Swedish Research Council (VR)
PublisherWILEY-BLACKWELL
Citation statistics
Document Type期刊论文
Identifierhttp://ir.nigpas.ac.cn/handle/332004/511
Collection中国科学院南京地质古生物研究所
中国科学院南京地质古生物研究所
其他
Corresponding AuthorSha JinGeng (沙金庚)
Affiliation1.Chinese Acad Sci, State Key Lab Palaeobiol & Stratig, Nanjing Inst Geol & Palaeontol, Nanjing 210008, Peoples R China
2.Lund Univ, Dept Earth & Ecosyst Sci, S-22362 Lund, Sweden
3.PetroChina Xinjiang Oil Field Co, Keramay 834000, Peoples R China
4.Nanjing Univ, Sch Earth Sci & Engn, Nanjing 210093, Peoples R China
5.PetroChina, Res Inst Petr Explorat & Dev, Beijing 100083, Peoples R China
Recommended Citation
GB/T 7714
Sha JinGeng ,Vajda, Vivi,Pan Yanhong ,et al. Stratigraphy of the Triassic-Jurassic Boundary Successions of the Southern Margin of the Junggar Basin, Northwestern China[J]. ACTA GEOLOGICA SINICA-ENGLISH EDITION,2011,85(2):421-436.
APA Sha JinGeng .,Vajda, Vivi.,Pan Yanhong .,Larsson, Linda.,Yao Xiaogang .,...&Peng Bo.(2011).Stratigraphy of the Triassic-Jurassic Boundary Successions of the Southern Margin of the Junggar Basin, Northwestern China.ACTA GEOLOGICA SINICA-ENGLISH EDITION,85(2),421-436.
MLA Sha JinGeng ,et al."Stratigraphy of the Triassic-Jurassic Boundary Successions of the Southern Margin of the Junggar Basin, Northwestern China".ACTA GEOLOGICA SINICA-ENGLISH EDITION 85.2(2011):421-436.
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