Nature and Geochemical Effects of Fluids during Ductile Shearing of UHP Eclogite
详细信息
- 责任者：Gao Li’e (Institute of Geology ; Chinese Academy of Geological Sciences ; Beijing 100037 ; China) ; Zeng Lingsen
- 刊名：Acta Petrologica Sinica
- 出版年：2011
- 卷期：27(4)
- 关键词：榴辉岩 ; eclogite ; 元素地球化学 ; elements geochemistry ; 苏鲁造山带 ; Su-Lu Orogenic Belt
- 页码：p.1095-1115
- 图表：8 illus., 6 tables, 86 refs.
- 分类号：0802
- 出版序号：839
- issnNo：ISSN1000-0569
- isbnNo：CN11-1922/P
摘要
///Ductile shear zone is a highly coupled system that involves both mechanical and chemical processes at the presence of aqueous fluids at relatively high temperature conditions. Sample DH-2G, an intensively sheared eclogite, consists of garnet, omphacite, rutile, and minor phengite, zoisite, hornblende, plagioclase, quartz, zircon and apatite. Omphacite and rutile show similar pattern. Electron microprobe and LA-ICP-MS analyses were performed on garnet, omphacite and rutile grains. The data show that 1) major and trace element contents in garnet-I and garnet-II are almost the same, except Ni; and 2) omphacite-I and omphacite-II also do not show substantial differences in major element composition; but they do have significant differences in trace element geochemistry, especially in REEs. The fluids, the important carrier of mobile elements (LILE and LREE) and relatively immobile elements (HFSE), conspicuously affect the rheology of subduction crust and could contribute to the rapid exhumation of UHP slab.
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