Geological characteristics and the prospecting significance of the spodumene-muscovite pegmatite in the Renli ore-field, Hunan Province

被引：0

作者：

Shi W. ^{[1
]}

Zhou F. ^{[2
]}

Liu X. ^{[3
]}

Li P. ^{[4
]}

Huang Z. ^{[2
]}

Wen C. ^{[5
]}

Chen Q. ^{[2
]}

Su J. ^{[2
]}

Huang X. ^{[2
]}

Zhang Z. ^{[2
]}

Zhang L. ^{[2
]}

Chen H. ^{[2
]}

Liu J. ^{[6
]}

Hu X. ^{[2
]}

机构：

[1] Geological Bureau of Hunan Province, Changsha

[2] No. 311 Geological Party of Hunan Nuclear Geological Bureau, Changsha

[3] Hunan Eco-enviromnenal Affairs Center, Changsha

[4] MNR Key Laboratory of Metallogeny and Mineral Assessment, Institute of Mineral Resources, Chinese Academy of Geological Sciences, Beijing

[5] Hunan Institute of Geological Survey, Changsha

[6] Hunan Nuclear Institute of Geological Survey, Changsha

来源：

Dizhi Xuebao/Acta Geologica Sinica | 2020年 / 94卷 / 03期

关键词：

Geochemical characteristics; Hunan Province; Prospecting direction; Rare metal spodumene-muscovite pegmatite; Renli ore-field;

D O I：

10.19762/j.cnki.dizhixuebao.2020138

中图分类号：

学科分类号：

摘要：

The Renli ore field is located on the southwest margin of the tongue like section of the Mufushan batholith in the middle part of the Jiangnan orogenic belt between the Yangtze and the Cathaysian blocks. Rare metal pegmatites in the Renli ore field display spatially zonal mineralization. The pegmatite type in the northeast of the ore field is the muscovite pegmatite, but is spodumene-muscovite in the southwest. In this paper, the geological and geochemical characteristics of the three representative spodumene muscovite pegmatites in the ore field are studied. The analysis data shows that the average value of SiO2 is 71.8%, Al2O3 is 16.1%, the mole ratio of Al2O3/CaO+Na2O+K2O (A/CNK=1.52~13.0) is more than 1. 1, the differentiation index (DI) is 89.7~97.5, and the content of F is 0.04%~0.84%. These samples exhibit moderate Eu anomalies (δEu=0.27~0.87), ΣREE=2.07~14.8, and LREE/HREE=6.90~15.9. Based on the above data we propose that: (1) the granitic pegmatites in the Renli ore field are typical highly differentiated composite granitic pegmatites formed under the peraluminous magmatic system, which is rich in alkali, rare metals, and Hf-Zr. The mineralization of lithium, niobium, tantalum and other rare metals is closely related to phosphorization. (2) Spodumene-muscovite pegmatite has good internal zoning, and its crystallization differentiation time is later than muscovite pegmatite. We speculate that the longer crystallization and differentiation time of pegmatite magma is more favorable for the enrichment of Li element. The mineralized combination of rare metal in the ore field exhibit evolution trend of Be+Nb+Ta→Be+Nb+Ta+Li→Be+Li. (3) The Renli ore field is rich in lithium ore resources that are mainly concentrated in the southwest of the ore field. It is expected to further increase the tantalum and niobium resources in the ore field and has the potential to become a large high-grade lithium deposit. Furthermore, more attention should be paid to the poor Nb-Ta concentration area of the spodumene pegmatites during the process of lithium exploration in the Renli ore-field. © 2020, Science Press. All right reserved.

引用

页码：817 / 835

页数：18

共 37 条

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