| 中国大陆科学钻100～850m深度岩心的贵金属地球化学 |
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| 关键词:precious metals platinum group elements (PGE) geochemistry CCSD eclogite peridotite |
| 基金项目:中国大陆科学钻探（CCSD）工程项目 |
| 作者 | 单位 | E-mail | | 王登红 | 中国地质科学院矿产资源研究所,北京,100037 | wangdenghong@sina.com | | 陈毓川 | 中国地质科学院,北京,100037 | | | 徐珏 | 中国地质科学院矿产资源研究所,北京,100037 | | | 余金杰 | 中国地质科学院矿产资源研究所,北京,100037 | | | 李纯杰 | 中国地质科学院矿产资源研究所,北京,100037 | |
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| Precious Metals Geochemistry of Cores from 100 to 850 m Depth of the Chinese Continental Scientific Drilling |
| This paper reports geochemical characteristics of platinum group elements (PGEs) as well as gold and silver obtained for the first time in the core samples from the depth of 100 m to 850 m in the Chinese Continental Scientific Drilling (CCSD) hole. The average contents of PGE from 100 m to 850 m are very low (Ir<0.1×10 -9,Os<0.3×10 -9,Pd<0.5×10 -9,Pt<0.4×10 -9,Rh<0.1×10 -9,Ru<0.4×10 -9), usually lower than the average content of PGE in the earth crust, and much lower than their normal contents in the mantle or mantle-derived mafic-ultramafic rocks. Such extremely low contents of PGEs in eclogites and peridotites from the CCSD can be considered to be a negatively abnormal feature, strongly suggesting that most of the platinum group elements must have been activated and mobilized away from their original mafic-ultramafic rocks during the metamorphic process in the Sulu-Dabie ultra-high pressure (UHP) metamorphic belt. Both ecologites and peridotites have very low contents of PGEs, and their chondrite-normalized patterns are different. These characteristics can be used to differentiate different kinds of metamorphic rocks or restore metamorphic rocks. Considering that platinum group minerals (PGMs) such as laurite and iridic platinum were found in the Jiangzhuang ultramafic intrusion near the CCSD site, the model is acceptable that the PGEs in the original mafic-ultramafic rocks were transferred and concentrated in some unknown ore-bearing bodies during the metamorphic process. It is therefore possible to find PGE-bearing orebodies in future at the CCSD site in the eastern part of the Sulu-Dabie UHP belt. |
| WANG Deng-hong,CHEN Yi-chuan,XU Yue,YU Jin-jie,LI Chun-jie.2005.Precious Metals Geochemistry of Cores from 100 to 850 m Depth of the Chinese Continental Scientific Drilling[J].Acta Geoscientica Sinica,26(6):535-540. |
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