Study on the Mineralogical Features of Chloritoid in Hongmiaoling Formation of Dongshan, Tanzhesi, West Beijing, China
详细信息
- 责任者：Huang Dubin (School of Geoscience and Surveying Engineering ; China University of Mining and Technology ; Beijing 100083 ; China) ; Guan Xinbang
- 刊名：Acta Mineralogica Sinica
- 出版年：2012
- 卷期：32(2)
- 关键词：硬绿泥石 ; chloritoid ; 北京 ; Beijing
- 页码：p.200-204
- 图表：2 illus., 3 tables, 15 refs.
- 分类号：0700
- issnNo：ISSN1000-4734
- isbnNo：CN52-1045/P
摘要
The mineralogical features of chloritoid in Hongmiaoling Formation of Dongshan, Tanzhesi, West Beijing, China were studied by using polarization microscope, X-ray diffraction (XRD), Raman spectroscopy(Raman), scanning electron microscope (SEM) and energy dispersive spectrometer (EDS). The results show that, rose-like or fasciculate chloritoid in this area is monoclinic crystal with contact twin. Its chemical formula can be written as (Fe2+, Mg)(Al, Fe3+)2SiO5(OH)2 as Fe2+ is oxidized to Fe3+ and replaces Al3+. Paragonite is found in the sample, indicating the metallogenic temperature of 350~500 ℃. The orientation of chloritoid shows that chloritoid is a stress mineral,and its formation may be related to the deeply structural controlled hydrothermal activities.
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