Crustally Derived Carbonatite from the Daqinshan Area: Zircon Features and SHRIMP Dating
详细信息
- 责任者：Dong Chunyan (Beijing SHRIMP Centre ; Institute of Geology ; Chinese Academy of Geological Sciences ; Beijing 100037 ; China) ; Liu Dunyi
- 刊名：Acta Geologica Sinica
- 出版年：2009
- 卷期：83(3)
- 关键词：孔兹岩 ; khondalite ; SHRIMP定年 ; SHRIMP dating ; 大青山 ; Daqing Mountains
- 页码：p.388-398
- 图表：7 illus., 1 table, 37 refs.
- 分类号：0802
- issnNo：ISSN0001-5717
- isbnNo：CN11-1951/P
摘要
The khondalite suit in the Daqinshan area has been subdivided into garnet-biotite gneiss, diopside gneiss and marble subunits. Diopside marble of diopside gneiss subunit is considered to be crustally derived carbonatite in terms of geology, petrography, geochemistry, zircon features and dating. Zircons from the crustally derived carbonatite contain various inclusions, including baddeleyite, calcite, apatite, titanite, quartz, feldspar, pyroxene and CO2. The zircons commonly have core-rim structures. Mostly cores show oscillatory zoning in CL and plane polarized light images, suggesting a magmatic origin. The zircon without distinct structural change may represent a metamorphic origin. The baddeleyite inclusions occur in both magmatic and metamorphic zircons. Magmatic and metamorphic zircons from four samples give ages of 1.95 ~ 1.93 Ga and 1.90~ 1.89 Ga, respectively.
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