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- Title
华北克拉通北缘中元古界杨庄组碳酸盐岩 地球化学特征及其地质意义.
- Authors
杨晋东; 赵峰华; 秦胜飞; 邹雨; 宋昌贵; 孙宇翔
- Abstract
In order to study its structural-sedimentary environment and provenance,we collected carbonate rocks in research area and used method of combining geochemical analysis and geological background. Conclusions are drawn as follows. The content of rare earth elements of Yangzhuang Formation outclasses that of pure dolomite and shows a remarkable correlativity between Al2O3 and ΣREE+Y,and REE+Y distribution pattern of PAAS is similar to shale(besides Eu positive anomaly),which indicate its depositional process was influenced by terrigenous clastic significantly. Yangzhuang Formation experienced marine transgression-regression cycle,and change curves of Sr/Ba and ΣREE+Y and their correlation show that sea level eustacy controls the content of terrigenous clastic. The relation diagrams of La/Sc-Th/Co,La-Th-Sc and TiO2-Zr and analysis of element geochemical characteristics combined with magmatism and tectonic evolution show that the terrigenous clastic of carbonate rocks in Yangzhuang Formation originated from acid-felsic igneous rocks under continental rift environment in Proterozoic. The sedimentary facies of the Yangzhuang Formation are supralittoral zone and inter tidal zone,and seawater has strong oxidability,which is not conducive to the source rock development.
- Subjects
CLASTIC rocks; CARBONATE rocks; IGNEOUS rocks; RARE earth metals; ANALYTICAL geochemistry; DOLOMITE; GEOCHEMICAL modeling
- Publication
Natural Gas Geoscience, 2020, Vol 31, Issue 2, p268
- ISSN
1672-1926
- Publication type
Article
- DOI
10.11764/j.issn.1672-1926.2019.10.016