新疆乌鲁木齐地区上石炭亚系祁家沟组介形类及其古环境和古地理意义<sup>*</sup>

doi:10.7605/gdlxb.2023.02.022

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Abstract The overall occurrence,stratigraphical distribution,palaeoenvironmental and palaeobiogeographical significances of the ostracod faunas from the Upper Carboniferous Qijiagou Formation in the Qijiagou section of the Urümqi region,China,are documented in this study. Nineteen species belonging to 11 genera are identified and figured herein. The ostracod fauna in the Qijiagou Formation indicates an age of the Moscovian-Kasimovian. The ostracod assemblages from the Qijiagou Formation belong to palaeocopid and smooth-podocopid associations,and ecologically equivalent to the OA1-OA3 assemblages in the active plate margin. The changes of ostracod assemblages and sedimentary evidences from the Qijiagou section indicate littoral and shallow sea facies,and there was probably a regression when the Qijiagou Formation were being deposited in the Qijiagou section of the Urümqi region. The ostracods of the Qijiagou Formation have strong affinities with the taxa of Tarim,Junggar,central Tianshan and Urals,and also share some similarities with those from North America,West Europe and North China. This implies that the Junggar and Tarim blocks converged and were relatively close to the Laurasia during the Pennsylvanian(Late Carboniferous),and ostracods experienced faunal exchanges between Junggar-Tarim blocks and Laurentia. The above ostracods, further enriched the fossil materials of Qijiagou Formation, is of great sinificance for exploring the evolutionary characteristics of the acient Asian Ocean and regional mineral devdopment.

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	Articles by authors
	JIN Jun
	LUO Zhengjiang
	WANG Jian
	ZHANG Xiaogang
	CHEN Jun
	LI Changgen
	SUN Yucong
	HUANG Xing
	QIE Wenkun
	SONG Junjun

Key words： Carboniferous ostracods Qijiagou Formation Xinjiang palaeoenvironment palaeobiogeography

Received: 29 August 2022

ZTFLH:

Q915.2

Fund:Second Tibetan Plateau Scientific Expedition and Research Program(No. 2019QZKK0706) and the outsourcing project of the Research Institute of Experiment and Detection,PetroChina Xinjiang Oilfield Company(No.2020-C4010)

Corresponding Authors: SONG Junjun,born in 1989,an associate professor at Nanjing Institute of Geology and Palaeontology,Chinese Academy of Sciences,is mainly engaged in research on ostracods from the palaeozoic. E-mail: jjsong@nigpas.ac.cn.

About author: JIN Jun,born in 1970,research professor,is engaged in research on petroleum geology. E-mail: jinjun@petrochina.com.cn.

Cite this article:

JIN Jun,LUO Zhengjiang,WANG Jian et al. Ostracods from the Upper Carboniferous Qijiagou Formation, Urümqi region,Xinjiang and their implications on palaeoenvironment and palaeobiogeography[J]. JOPC, 2023, 25(2): 356-367.

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http://journal09.magtechjournal.com/gdlxb/EN/10.7605/gdlxb.2023.02.022 OR http://journal09.magtechjournal.com/gdlxb/EN/Y2023/V25/I2/356

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