河台金矿中稀土元素在韧性剪切过程中迁移行为的研究  

Transportation of REE in Ductile Shear Zone in Hetai Gold Deposit

作　　者：杨凤根[1] 王鹤年[2] 华仁民[2] 

机构地区：[1]中国科学院南京土壤研究所,江苏南京210008 [2]南京大学地球科学系内生金属矿床成矿机制研究国家重点实验室,江苏南京210093

出　　处：《中国稀土学报》2004年第1期164-170,共7页Journal of the Chinese Society of Rare Earths

基　　金：国家自然科学基金重点资助项目(49733012)

摘　　要：通过对两类糜棱岩及其原岩的稀土元素含量的分析研究,结果表明,稀土元素在韧性剪切过程中发生有规律的成分变异。在云母石英片岩及混合岩形成糜棱岩、超糜棱岩过程中,即随着变形强度的增强,单个稀土元素、轻稀土、重稀土和稀土总量均出现有规律的增加或减少,而稀土元素配分模式不变。通过对构造岩变形前后的等比分析,认为两类不同的糜棱岩类中稀土元素的成分变异极小,但存在少量稀土元素的迁入和迁出,变化的原因是在岩石变形过程中发生了体积的改变和大量的流体作用影响,并导致轻稀土相对富集、重稀土相对亏损的分异作用。The REE transportation in two sorts of mylonites of ductile shear zone, in Hetai gold deposit, Guangdong Province, was studied and the results show that there is REE compositional variation regularly in the ductile shear zone. When mica-quartz schist and migmatite are changing into mylonites or ultramylonites, i.e, along with intensifying deformation, the contents of each rare earth element and the total contents of the LREE, HREE and REE increase or decrease regularly, but the REE patterns of the rock are accordant. The isocon diagram of the tectonic rocks before and after deformation shows that the REE compositional variation of the mylonites or ultramylonites are very small, but there is a few REE moving in or out in the rock deformation. The reason of the REE compositional variation is that there are volume change and fluid flow in the rock deformation, and it leads to the LREE relative enrichment and HREE relative loss.

关 键 词：地球化学 成分分异 韧性剪切带 河台金矿 稀土 

分 类 号：P618.51[天文地球—矿床学] P595[天文地球—地质学]