China’s crust-and mantle-source pegmatites and their discriminating criteria |
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| Authors: | Tianren Zou Yueqing Yang Yongquan Guo Yunxiang Ni |
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| Institution: | 1. Institute of Mineral Deposits of the Chinese Academy of Geological Sciences, China
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| Abstract: | According to their material sources, China’s pegmatities can be divided into two broad types: (1) the crust-source pegmatites derived mainly from the upper continental crust, which can be subdivided into metamorphic differentiated, mixed metasomatic and anatectic magmadifferentiated pegmatites, and (2) the mantle-source pegmatites generated from the mantle, including those related to late differentiates and carbonatites. In space, carbonatites are usually accompanied with alkaii syenite. The criteria of discriminating the two-source pegmatites of China are listed as follows: - Rock-forming minerals (micas and feldspars);
- REE distribution patterns;
- Zr/Hf ratios in zircons; and
- Species of apatite and REE contents.
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