湖南千里山岩体中金红石化学成分标型特征研究  

Typomorphic features of the rutiles from the Qianlishan biotite granite in Hunan Province

作　　者：王耀可 鲁安怀[1] 李斌[1] 王智琳[1] 束正祥 WANG Yao-ke;LU An-huai;LI Bin;WANG Zhi-lin;SHU Zheng-xiang(School of Geosciences and Info-Physics,Central South University,Changsha 410083,China)

机构地区：[1]中南大学地球科学与信息物理学院

出　　处：《岩石矿物学杂志》2019年第5期693-704,共12页Acta Petrologica et Mineralogica

摘　　要：金红石是湖南千里山岩体黑云母花岗岩中一种常见的副矿物。本文通过分析千里山黑云母花岗岩中金红石的化学成分,探讨了金红石对岩浆热液演化与钨锡成矿的指示作用。结果表明,金红石主要受热液蚀变作用的影响呈3种形态产出。第1种为形成于黑云母裂隙的他形金红石;第2种是颗粒较大的单晶金红石;第3种是呈集合体产出且粒度不等的条带状金红石。随着黑云母花岗岩的蚀变与成矿作用的不断增强,黑云母花岗岩金红石中的元素钨不断富集,表明金红石中的钨含量可以作为花岗岩成矿能力的判别标志,含钨高的金红石对钨矿的形成富集有一定的指示意义,可作为钨矿找矿的标志之一。Rutile is a common accessory mineral in the Qianlishan biotite granite. In this paper,the authors investigated chemical significance of rutiles in tracing the magmatic-hydrothermal evolution and W-Sn metalogic process based on their typomorphic features. The results show that three forms of rutiles caused by the influence of the hydrothermal fluid can be identified. The first type of rutile occurs in the biotite fissure,being anhedral rutile,the second type is composed of euhedral crystals with relatively large grain size. The third type of rutile occurs as aggregates with banded and anisomerous structures. The continual increase of tungsten content of rutile with the enhancement of alteration and mineralization suggests that the tungsten content in the rutile can be used as a criterion for the ore-forming capability of granite,and the high tungsten-bearing rutile can indicate the formation and enrichment of the tungsten. In the future,these phenomena can be used as prospecting marks in search for tungsten deposits.

关 键 词：金红石 千里山岩体 钨矿 微量元素 

分 类 号：P578.47[天文地球—矿物学] P618.67[天文地球—地质学]