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Stratigraphical Framework and Geochronology of the Jurassic-Cretaceous in Jiangxi Province and Northern Guangdong Province
- WU Jianhua，WEI Changxi，GUO Hengfei，GUO Guolin，LIU Shuai
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2019, 25(2):
309.
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Based on the degree of stratigraphical development and characteristics of rock associations, the Jurassic-Cretaceous strata
in Jiangxi Province and Northern Guangdong Province can be subdivided into northern, central and southern district bounded by the
Pingxiang-Guangfeng fault and Sannan (Quannan, Longnan and Dingnan)-Xunwu fault. Based on the unconformity and rock
associations and the assumption that “Group” corresponds to volcanic or sedimentary cycles, the northern stratigraphical district can
be subdivided into Linshan Group, Huobashan Group, and Guifeng Group; the central stratigraphical district can be subdivided into
Linshan Group, Wuyi Group, Luotang Group, and Guifeng Group; the southern stratigraphical district can be subdivided into Yutian
Group, Wuyi Group, Xingning Group, and Nanxiong Group. According to the lithology and lithofacies and the assumption that a
formation corresponds to a sedimentary lithofacies or volcanic lithofacies association, the Linshan Group can be subdivided into
Shuibei Formation (Fm) and Luoao Fm; the Yutian Group into the Shuitoujing Fm, Changpu Fm and Hangang Fm; the Wuyi Group into
Shuangfengling Fm, Ehuling Fm, and Shixi Fm; the Xingning Group into Heshui Fm and Yousheng Fm; the Luotang Group into the
Baibu Fm, Zhoutian Fm, and Dengjia Fm; the Huobashan Group into the Qiujia Fm, Tiantaishan Fm, Lengshuiwu Fm, and Zhoujiadian
Fm; the Guifeng Group into the Hekou Fm, Tangbian Fm, and Lianhe Fm and the Nanxiong Group into the Dafeng Fm, Zhutian Fm,
and Zhenshui Fm. Fossil data and zircon U-Pb ages show that the Yutian Group and Linshan Group belong to the Early Jurassic-early
Middle Jurassic, the Wuyi Group to early Early Cretaceous, the Huobashan Group to middle Early Cretaceous, the Luotang Group to
late Early Cretaceous, the Xingning Group to early Late Cretaceous-early Late Cretaceous, the Guifeng Group and the Nanxiong Group
belong to late Late Cretaceous. The contrast in lithology and lithofacies, together with zircon U-Pb age data of the volcanic rocks , the
volcanic series belong to the Wuyi Group of the early Early Cretaceous in the Lengshuikeng mining area, and the volcanic series of the
original the Wuyi Groupis belong to the Longtouzhai Group of the Late Ordovician-early Early Silurian in Shixing (Guangdong
Province)-Quannan (Jiangxi Province).
