Geochemistry and Its Tectonic Implications of the Zuoquan-Zanhuang Complex
详细信息
- 责任者：Xiao Lingling (Institute of Geology ; Chinese Academy of Geological Sciences ; Beijing 100037 ; China) ; Liu Fulai
- 刊名：Acta Petrologica Sinica
- 出版年：2013
- 卷期：29(2)
- 关键词：杂岩 ; complexes ; 变质岩 ; metamorphic rocks ; 山西 ; Shanxi Province ; 河北 ; Hebei Province
- 页码：p.533-550
- 图表：illus., 3 tables, 64 refs.
- 分类号：0802
- issnNo：ISSN1000-0569
- isbnNo：CN11-1922/P
摘要
The Zuoquan metamorphic complex is located at the central-southern segment of the nearly NS-striking Trans-North China Orogen, in the southwest of the Zanhuang metamorphic complex. Felsic gneiss, biotite-plagioclase gneiss, amphibolite, mica schist and quartzite are the main and important types of metamorphic rocks in Paleoproterozoic-Late Archean. These metamorphic rocks were carefully studied through field investigations, petrographical and geochemical research. It was found that the geochemical characteristics of the rocks exposed both in the Zuoquan and Zanhuang areas were similar. Three types of protoliths of felsic gneiss, biotite-plagioclase gneiss and amphibolite were recognized: meta-sedimentary rocks, meta-granitic rocks and meta-basites. The meta-sedimentary rocks were originally sedimentary mudstones or graywackes coming mainly from upper crustal felsic rocks. REE distribution patterns of the rocks are similar to those of the PAAS and averaged upper-crustal compositions. Provenance of the mudstones or graywackes was weakly to moderately weathered and possibly formed in an active continental margin with the beginning of an island arc. The protoliths of meta-granitic rocks intrusive contact with meta-sedimentary rocks were intermediate-acidity intrusive rocks, and formed in a continental marginal arc environment. Protoliths of meta-basites were possibly calc-alkaline and tholeiitic rocks with lower ΣREE, weakly enrichment of LREE and visible crustal contamination characteristics. These rocks were formed in volcanic arcs within continental margin comparable to the present-day continental margin. It was inferred that the Zuoquan metamorphic complex and the Zanhuang metamorphic complex were involved in the subduction-collision process of the Eastern Block and the Western Block to form the coherent basement of the North China Craton along the Trans-North China Orogen.
© 2004-2018 中国地质图书馆版权所有 京ICP备05064691号 京公网安备11010802017129号 地址：北京市海淀区学院路29号 邮编：100083 电话：办公室：(+86 10)66554848；文献借阅、咨询服务、科技查新：66554700 |