期刊
SCIENCE CHINA-EARTH SCIENCES
卷 53, 期 11, 页码 1602-1610出版社
SCIENCE PRESS
DOI: 10.1007/s11430-010-4117-6
关键词
Longxi Formation; Hanjiang Formation; Sandbian; Ordovician graptolite; Kwangsian Orogeny
资金
- Chinese Academy of Sciences [KZCX2-YW-122, 2008ZX05008-001-001]
- Ministry of Science and Technology [2006CB806402]
- National Natural Science Foundation of China [40772002]
The Ordovician graptolite sequence of the Yongxin-Chongyi area in southern Jiangxi was suggested as a standard for the correlation of Ordovician in the Zhujiang region of South China. Based on a restudy of the Upper Ordovician graptolites, the Shikou and Huamianlong formations are recognized herein as a part of the Hanjiang Formation, corresponding only to the Diplacanthograptus caudatus-Diplacanthograptus spiniferus Zone. Two graptolite zones in the Longxi Formation of Yongxin and Chongyi, the Nemagraptus gracilis Zone and Climacograptus bicornis Zone, are redefined here. A rapid replacement of facies from the typical deep-water graptolitic black shale of Longxi Formation to the rapidly-accumulated, shallow-water clastic deposits of Hanjiang Formation indicates the tectonic initiation of the Kwangsian Orogeny. The thick clastic deposits of the Hanjiang Formation are proposed to come from a nearby source area that rose during the Kwangsian Orogeny. The D. caudatus-D. spiniferus graptolite Zone of the Hanjiang Formation indicates the initiation time of this tectonic event.
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