Late Carboniferous (Pennsylvanian) ostracods from East Junggar in Xinjiang, northwestern China

Abstract

Late Carboniferous (Pennsylvanian) ostracods are described from East Junggar in Xinjiang Uygur Autonomous Region (referred here as Xinjiang) of northwestern China. Twenty-one species belonging to 11 genera are recognized. Among them, two are new, Acratia xinjiangensis sp. nov. and Healdianella shiqianensis sp. nov. These species can be referred to the Ostracod Assemblage‐3 (OA-3) of the Shiqiantan Formation, and together with zircon U-P dating suggest a probable Moscovian–Kasimovian (middle–late Pennsylvanian) age for the unit. The OA-3 found in the limestones of the Shiqiantan Formation inhabited in open oceanic island arc context that is ecologically equivalent to the Eifelian Mega-Assemblage, and incorporated smooth-podocopid associations. The Shiqiantan Formation OA-3 thus implies a foreshore to offshore environmental transition within a post-collision rift basin.

Zhengjiang Luo [[email protected]],

Rui Wang [[email protected]],

Aliya Amuti [[email protected]] and

Yong Deng [[email protected]], PetroChina Xinjiang Oilfield Company Research Institute of Experiment and Detection and Joint Laboratory of Stratigraphy and Palaeontology, Xinjiang Oilfield Company, Nanjing Institute of Geology and Palaeontology, CAS, Karamay, Xinjiang 834000, PR China

Yucong Sun [[email protected]], Nanjing Institute of Geology and Palaeontology, Chinese Academy of Sciences, Nanjing 210008, PR China; University of Chinese Academy of Sciences (UCAS), Beijing 100049, PR China;

Wenkun Qie [[email protected]] and

Junjun Song [[email protected]] State Key Laboratory of Paleobiology and Stratigraphy, Nanjing Institute of Geology and Palaeontology and Center for Excellence in Life and Paleoenvironment, Chinese Academy of Sciences, Nanjing 210008, PR China; University of Chinese Academy of Sciences (UCAS), Beijing 100049, PR China.

Keywords:

• ostracods
• Pennsylvanian
• East Junggar
• Shiqiantan Formation
• palaeoenvironment

Acknowledgements

Jiayuan Huang and Congying Liu (NIGPAS) provided assistance in the field. Our reviewers and the Editorial Board of Alcheringa provided constructive comments and manuscript improvements.

Disclosure statement

No potential conflict of interest was reported by the author(s).

Additional information

Funding

This work was supported financially by the outsourcing project of the Research Institute of Experiment and Detection, Petrochina Xinjiang Oilfield Company [2020-C4010], Strategic Priority Research Program of Chinese Academy of Sciences [XDB26000000], Natural Science Foundation of China [41472001], and China Geological Survey grants [1212011120502, 1212011220245].