高校地质学报2016，Vol.22Issue(2)：254-263,10.DOI:10.16108/j.issn1006-7493.2015102
豫西伊川地区中元古界兵马沟组泥质岩地球化学特征及其环境与物源示踪
Geochemical Characteristics of Argillaceous Rocks of the Mesoproterozoic Bingmagou Formation in Yichuan, Western Henan and Its Environment and Provenance
摘要
Abstract
The Paleao-Mesoproterozoic tectonic and sedimentary evolution of southern North China craton has been debating for long time, with controversies focusing on whether it is a subduction or cracking rift. As the first sedimentary layer formed after Xiong’er Group, the Mesoproterozoic Bingmagou Formation is important to address this issue. Based on the analysis of geochemical characteristics of REE and trace element of argillaceous rocks in Bingmagou Formation, the sedimentary environment and properties of provenance and their tectonic significance were discussed in this study. The results showed that Chondrite normalized REE and trace elements have a high differention between LREE and HREE, which showed anomaly negativeδEu, anomaly insignificantδCe, and enrich Rb, Th, La, Ce, Nd, Zr, Hf, etc. Compared with the average upper crust, it was enriched in Sc, V, Cr , Co, Ni, Rb. Also we found that Ceanom index and V/V+Ni ratio reflected a reduction argillaceous sedimentary environment, and Sr/Ba and B/Ga ratios indicate its transitional environment from continent to marine. In addition, Cr/Zr, Th/U and other elements ratios prove its provenance is not deep material, and La/Yb-Ce, Co/Th-La/Sc diagrams indicate the provenance is middle-acidic volcanic rocks. Furthermore, Th-Sc-Zr/10, Th-Co-Zr/10 illustrations indicate its provenance is mainly from continental volcanic arc. Taken these results and regional geological information together, it can be concluded that Bingmagou Formation in Yichuan was formed in an extensional back-arc basin, Xiong’er Group was an arc island.关键词
华北南缘/中元古界兵马沟组/泥质岩/地球化学特征/沉积环境/物源Key words
southern North China craton/Mesoproterozoic Bingmagou Formation/argillaceous rock/geochemical characteristic/sedi-mentary environment/provenance分类
天文与地球科学引用本文复制引用
郑德顺,孙风波,程涌,张飞鹏..豫西伊川地区中元古界兵马沟组泥质岩地球化学特征及其环境与物源示踪[J].高校地质学报,2016,22(2):254-263,10.基金项目
国家自然科学基金项目 （）
