Alkali-rich igneous rocks and related Au and Cu large and superlarge deposits in China |
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Authors: | Zhao Zhenhua Xiong Xiaolin Wang Qiang Bao Zhiwei Zhang Yuquan Xie Yingwen Ren Shuangkui |
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Affiliation: | 1.Guangzhou Institute of Geochemistry,Chinese Academy of Sciences,Guangzhou,China |
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Abstract: | The alkali-rich igneous rocks in China occur as fifteen linear distributed belts of each extending several hundreds to several thousands kilometers in length. These include most types of alkali-rich igneous rock categories discovered worldwide. The related Au, Cu large and superlarge deposits or metallogenic focus-areas include Dongping, Guilaizhuang, Yulong, etc. Direct and indirect genetic links have been found between alkali-rich igneous rocks and Au, Cu mineralization. The petrogenesis and metallogenesis of the alkali-rich igneous rocks are mainly controlled by (1) mantle enrichment, (2) strong interaction between mantle and crust, (3) lower contens of sulfur, high f O2 and high contents of volatiles, (4) the significant turn of regional tectonic framework from compress to extension and (5) the strong change of regional lithosphere structure. |
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