Formation of Rodingite from Mantle Wedge in Dongdegou, Southwestern Tianshan Mountains——Mineralogical and Major Element Evidences
详细信息
- 责任者：Wu Su (Shandong Provincial Key Laboratory of Depositional Mineralization & Sedimentary Minerals ; College of Geological Science & Engineering ; Shandong University of Science and Technology ; Qingdao 266590 ; China) ; Kong Fanmei
- 刊名：Geological Review
- 出版年：2013
- 卷期：59(1)
- 关键词：变质岩 ; metamorphic rocks ; 天山 ; Tianshan Mountains
- 页码：p.71-82
- 图表：illus., 4 tables, 29 refs.
- 分类号：0802
- issnNo：ISSN0371-5736
- isbnNo：CN11-1952/P
摘要
Rodingite was discovered in the contact zone between amphibolite and serpentinitized ultramafic rock in mantle wedge of the upper subduction zone,Dongdegou,southwestern Tianshan Mountains. According to the degree of rodingitization,three rock types can be classified: amphibolite,rodingitized amphibolite and rodingite; corresponding mineral assemblies are: amphibole + andesine + quartz + titanite + apatite ± salite; amphibole + anorthite + diopside + clinozoisite + chlorite ± calcite; clinozoisite + grossularite + diopside + chlorite + calcite. Mineral chemistry and their major element characteristics of the rodingitic rocks show that metasomatic fluid is abundant in Ca and Al . Compared with the rodingitizition metasomatism occurred in ocean floor,the fluid contained in rodingitized rock here is much less intensive. Mass balance calculation also indicates that the convertion of amphibolite into rodingite is under the condition of enriched Ca and Al fluid. Further more,Mg adds into the rock in the early stage,but obviously decreases in the late stage during rodingitization.
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