辽宁鞍山地区陈台沟蛇绿岩地球化学特征

余超; 田毅; 王广伟; 豆世勇; 鲍东明; 杨玉伟

doi:10.13686/j.cnki.dzyzy.2014.06.009

辽宁鞍山地区陈台沟蛇绿岩地球化学特征

1.
辽宁省地质矿产调查院, 辽宁沈阳 110031;

2.
辽宁省物测勘查院, 辽宁沈阳 110121

详细信息

作者简介: 余超(1987-),男,从事区域地质调查工作,通信地址辽宁省沈阳市皇姑区宁山中路42号,E-mail//286149526@qq.com

中图分类号: P595

收稿日期: 2013-12-26

修回日期: 2014-03-15

刊出日期: 2014-12-31

GEOCHEMISTRY OF THE CHENTAIGOU OPHIOLITE IN ANSHAN AREA, LIAONING PROVINCE

1.
Liaoning Institute of Geology and Mineral Resources Survey, Shenyang 110031, China;

2.
Liaoning Institute of Geophysical Exploration, Shenyang 110121, China

Received Date: 26 December 2013

Revised Date: 15 March 2014

Publish Date: 31 December 2014

摘要

摘要: 岩石化学、地球化学资料表明，古太古代陈台沟蛇绿岩由绿泥滑石片岩和蛇纹岩（橄榄岩）、角闪岩类岩石（拉斑玄武岩）、石英岩（远洋深海硅质岩）组成，它们具备蛇绿岩套层序的基本特征，可能为古太古代洋壳残片.陈台沟蛇绿岩具有贫硅、贫碱、低钛，而富铁、镁，稀土总量很低的特点.微量元素分析结果表明该蛇绿岩中的玄武岩富集K、Rb、Ba等大离子亲石元素，亏损Nb、Hf等高场强元素，具有岛弧型火山岩的特点，其在稀土元素球粒陨石标准化配分图解中主要显示平坦型曲线.陈台沟蛇绿岩的形成环境可能为岛弧环境.
- 蛇绿岩 /
- 地球化学特征 /
- 岛弧环境 /
- 陈台沟 /
- 辽宁省
Abstract: Petrochemical and geochemical data show that the Paleoarchean Chentaigou ophiolite, composed of chlorite talc-schist, serpentinite (peridotite), amphibolit (tholeiite) and quartzite, has the essential characteristics of ophiolite suite, probably to be the relics of Paleoarchean oceanic crust. The Chentaigou ophiolite is characterized by poor silicon and alkali and low titanium, but rich iron and magnesium, with low total REE. Analysis on trace elements indicates that the basalt in the ophiolite is enriched in large ion lithophile elements(LILEs, such as K, Rb and Ba), whereas depleted in high field strength elements (HFSEs, such as Nb and Hf), with the characteristics of island-arc volcanic rocks. The chondrite-normalized REE distribution patterns of the ophiolite show mostly flat curves. It is concluded that the Chentaigou ophiolite probably occurred and developed in an island arc environment.
- ophiolite /
- geochemical characteristics /
- island arc environment /
- Chentaigou /
- Liaoning Province