| 中国大陆科学钻100～850 m深度岩心的贵金属地球化学 |
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| 引用本文： | 王登红,陈毓川,徐珏,余金杰,李纯杰.中国大陆科学钻100～850 m深度岩心的贵金属地球化学[J].地球学报,2005,26(6):535-540. |
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| 作者姓名： | 王登红 陈毓川 徐珏 余金杰 李纯杰 |
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| 作者单位： | 中国地质科学院矿产资源研究所,北京,100037;中国地质科学院,北京,100037;中国地质科学院矿产资源研究所,北京,100037;中国地质科学院矿产资源研究所,北京,100037;中国地质科学院矿产资源研究所,北京,100037 |
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| 基金项目： | 中国大陆科学钻探（CCSD）工程项目 |
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| 摘 要： | 本文对CCSD超深钻中首次获得的铂族元素及金、银的地球化学特点进行了分析和研究,结果表明各类样品的铂族元素含量均偏低,100～850 m深度平均Ir小于0.1×10-9,Os小于0.3×10-9,Pd小于0.5×10-9,Pt小于0.4×10-9,Rh小于0.1×10-9,Ru小于0.4×10-9,只有个别橄榄岩样品的铂族元素含量接近于地壳丰度,但远远低于超基性岩的一般含量.这种极低的铂族元素含量,属于"负异常",表明在变质作用过程中铂族元素发生了活化转移.榴辉岩和橄榄岩的铂族元素含量都偏低,但其球粒陨石标准化配分明显具有明显不同的特点,利用铂族元素仍然可以帮助对变质岩进行分类或恢复原岩.前人在蒋庄超基性岩岩体的人工重砂中发现有铂族矿物,其中包括有铱铂矿.可见,铂族元素是可以活化转移的,其活化转移的原因还需要探讨,是在结晶分异过程中转移的、还是在折返过程中活化的、或者是在造山运动结束之后由于其他原因而造成的,尚需要深入研究.
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| 关 键 词： | 贵金属 铂族元素 地球化学 中国大陆科学钻探 |
Precious Metals Geochemistry of Cores from 100 to 850 m Depth of the Chinese Continental Scientific Drilling |
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| WANG Deng-hong,CHEN Yi-chuan,XU Yue,YU Jin-jie and LI Chun-jie.Precious Metals Geochemistry of Cores from 100 to 850 m Depth of the Chinese Continental Scientific Drilling[J].Acta Geoscientia Sinica,2005,26(6):535-540. |
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| Authors: | WANG Deng-hong CHEN Yi-chuan XU Yue YU Jin-jie and LI Chun-jie |
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| Institution: | Institute of Mineral Resources, CAGS, Beijing 100037;Chinese Academy of Geological Sciences, Beijing, 100037;Institute of Mineral Resources, CAGS, Beijing 100037;Institute of Mineral Resources, CAGS, Beijing 100037;Institute of Mineral Resources, CAGS, Beijing 100037 |
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| Abstract: | 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. |
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| Keywords: | precious metals platinum group elements (PGE) geochemistry CCSD eclogite peridotite |
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