2016年6月，第22卷，第2期，254-263页
Jun 2016,Vol.22,No.2，pp.254263 DOI: 10.16108/j.issn10067493.2015102
高校地质学报
Geological Journal of China Universities
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
郑德顺，孙风波，程涌，张飞鹏 1.河南理工大学资源环境学院，焦作454000： 2.昆明冶金高等专料学校矿业学院，昆明650000
捕要：华北克拉通南缘古-中元古代构造-沉积演化的筛冲说、裂解说之争由来已久，兵马沟组作为熊耳群形成后的第一套碎屑沉积岩层，对解释上述过程有重要意义。该文通过对豫西伊川地区的兵马沟组泥质岩微量及稀土元素的地球化学特征分析，探讨了其沉积环境、物源，进而揭示了其发育的大地构造背景。结果表明：(1)兵马沟组泥质岩稀土元素含量高，球粒陨石标准
Rb；(2)Ce=指数、V/V+Ni反映了泥质岩沉积时的还原环境Sr/Ba、B/Ga表明其为由陆相至海相的过渡型沉积；(3)Cn/Zr、Th/U 等元素比值关系反应其物源无深部物质加人，La/Yb-Ce、Co/Th-La/S:图解表明物源为中酸性火山岩及少量稳定陆壳物质；(4)Th-Sc-Zr/10、Th-Co-Zz/10图解表明其物源主要来自大陆岛弧。综合上述分析结果，结合区域地质信息，可以得出中元古界
兵马沟组形成于大陆岛弧弧后盆地，崩耳群分布区为中元古代筛冲成因的大陆岛弧区。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
中图分类号：P597
文献标识码：A
文章编号：10067493（2016）02025410
GeochemicalCharacteristicsofArgillaceousRocksofthe
MesoproterozoicBingmagouFormationinYichuan,WesternHenan
andItsEnvironmentandProvenance
ZHENG Deshun', SUN Fengbo', CHENG Yong, ZHANG Feipeng 1. Institute of Resource and Environment, Henan Polytechnic University, Jiaozuo 454000, China
2. School of Mines, Kunming Metallury College, Kunming 650000, China
Abstract: The PaleaoMesoproterozoic tectonic and sedimentary evolution of southem 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 fomed 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 negative &,, anomaly insignificant &,, and enrich Rh, Th, La, Ce, Nd, Zr, Hf, etc. Compared with the average upper erust, it was enriched in Se, V, Cr , Co, Ni, Rh. Also we found that Cese index and V/V + Ni ratio reflected a reduction argillaceous sedimentary environment, and Sr/Ba and B/Ga ratios indicate its
收稿日期：201505-12；修回日期：201507-15 基金项目：国家自然科学基金项目（41272118）
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