| 光谱学与光谱分析 |
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| Study on Microarea Characteristics of Calcite in Archaean BIF from Wuyang Area in South Margin of North China Craton and Its Geological Significances |
| LI Hong-zhong1, ZHAI Ming-guo1, ZHANG Lian-chang1, YANG Zhi-jun2, 3*, ZHOU Yong-zhang2, 3, WANG Chang-le1, LIANG Jin2, 3, LUO An2 |
1. Key Laboratory of Mineral Resource, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China
2. Department of Earth Science of Sun Yat-Sen University, Guangzhou 510275, China
3. Guangdong Provincial Key Lab of Geological Processes and Mineral Resource Survey, Guangzhou 510275, China |
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Abstract The results of Raman, SEM, CL and EDS analysis show that the quartz-type BIF (banded iron formation) in Tieshanmiao formation, from Wuyang area of south North China Craton mainly contains quartz, magnetite and a small quantity of calcite. In comparison, magnetites represent the highest automorphic degree, while calcites contribute to the lowest automorphic degree. In addition, the automorphic degree of the quartz lies between magnetite and calcite. In the results of Raman analysis, the crystallinity and order degree are quite diverse in the vertical direction of the calcite band-like, and this is different from the calcite vein precipitating from the upper hydrothermal fluid. There are obvious plastic flow happening to calcite particles. During the process of plastic flow, the calcites are finally filled in the space between quartz and magnetite. This is the reason why the cross sectional shape and distributional characteristics of calcite aggregate are controlled by the particles of quartz and magnetite, which is also evidenced by the calcite filled into the slight interspace between two particles of quartz. In the Raman analysis, there are apparent differences of microarea component in calcite band-like, and this denotes that it is produced by the plastic flow and concourse process. What’s more, the calcite acts as the migration intermedium of tiny magnetite during their concourse and crystallization processes, which is witnessed by the concentrated particles of magnetite in small size in local parts of the calcites. With the help of calcite, the small magnetite particles join together to crystallize with bigger size or form aggregate of minerals.
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Received: 2013-03-09
Accepted: 2013-05-10
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Corresponding Authors:
YANG Zhi-jun
E-mail: yangzhj@mail.sysu.edu.cn
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