关键词: 苏南地区, 沉积岩, 地球化学, 沉积环境, 构造背景, 物源分析

Abstract:

Based on the testing and analyzing of trace elements and rare-earth elements of 333 sedimentary rocks from Shengke-1 well, the sedimentary environment, provenance and tectonic setting on the Mesozoic and Paleozoic are revealed in Southern Jiangsu Province. The research indicates that the Upper Chisia Formation in Southern Jiangsu Province presented apparently oxygen-rich characteristic. The sedimentary environment of Southern Jiangsu Province on the Mesozoic and Paleozoic is the alternative variation pattern of marine and continent. According to the analysis of REE、∑LREE/∑HREE、w(La)、w(Ce)、w(La)/w(Yb)、δEu in clastic rocks and the diagrams of La-Th-Sc、Th-Sc-Zr/10, the provenances of the Upper of Longtan Formation、Fengtou Formation and Gaojiabian Formation are the active continental margin setting, but the Lower of Longtan Formation is the continental island arc type, and probably the Wutong Formation is maybe passive continental margin setting. Based on the δEu the REE distribution pattern and La/Yb-∑REE, the provenances of these stratums are the upper earth shell and there are many provenances. The source rocks of Gaojiabian Formation and Fengtou Formation of Silurian are dominated by sedimentary rock and granite. The source rock of the Wutong Formation is sedimentary rock from Cathaysia and Jiangnan uplift.

Key words: Southern Jiangsu Province, sedimentary rocks, geochemistry, sedimentary environment, tectonic setting, provenance