广西栗木锡钨铌钽矿床岩浆液态不混溶作用及其与矿化的关系
锡钨多金属矿化多与Li—F碱长花岗岩有关,其岩浆演化晚期常发生较大规模的液态分异作用。广西采木锡钨铌钽矿与成矿有关的岩体包括肉红色中粒碱长花岗岩以及顶部的白色细粒碱长花岗岩。矿化产于碱长花岗岩顶部附近,主要矿化类型包括花岗岩型钨锡铌钽矿化、似伟晶岩型钨矿化、长石石英脉型钨矿化和石英脉型钨锡矿化。碱长花岗岩中存在大量岩浆液态不混溶现象,包括矿囊、似伟晶岩和细晶岩等。地质地球化学研究发现,岩浆液态不混溶作用贯穿于栗木碱长花岗岩分异演化的全过程,矿囊代表岩体中富含钨锡和挥发份的岩浆,岩体顶部的似伟晶岩和细晶岩是碱长花岗岩岩浆分异的结果。在岩浆液态不混溶作用过程中,W、Sn、Nb、Ta等成矿元素以及挥...
Saved in:
Published in | 地质与勘探 Vol. 49; no. 6; pp. 1046 - 1055 |
---|---|
Main Author | |
Format | Journal Article |
Language | Chinese |
Published |
2013
|
Subjects | |
Online Access | Get full text |
Cover
Loading…
Summary: | 锡钨多金属矿化多与Li—F碱长花岗岩有关,其岩浆演化晚期常发生较大规模的液态分异作用。广西采木锡钨铌钽矿与成矿有关的岩体包括肉红色中粒碱长花岗岩以及顶部的白色细粒碱长花岗岩。矿化产于碱长花岗岩顶部附近,主要矿化类型包括花岗岩型钨锡铌钽矿化、似伟晶岩型钨矿化、长石石英脉型钨矿化和石英脉型钨锡矿化。碱长花岗岩中存在大量岩浆液态不混溶现象,包括矿囊、似伟晶岩和细晶岩等。地质地球化学研究发现,岩浆液态不混溶作用贯穿于栗木碱长花岗岩分异演化的全过程,矿囊代表岩体中富含钨锡和挥发份的岩浆,岩体顶部的似伟晶岩和细晶岩是碱长花岗岩岩浆分异的结果。在岩浆液态不混溶作用过程中,W、Sn、Nb、Ta等成矿元素以及挥发份不断富集,形成岩浆岩型、长英质脉型以及石英脉型矿化。不同类型的矿化对应岩浆液态不混溶作用的不同阶段,由此建立了栗木矿床岩浆液态不混溶的成矿演化模型。 |
---|---|
Bibliography: | Guangxi, Limu, alkali-feldspar granite, liquid immiscibility 11-2043/P WANG Yan-li,PENG Qi-ming,ZHU Xin-you, CHENG Xi-yin,FU Qi-bin,YANG Yi(1. China University of Geosciences, Beijing 100083 ;2. China Non-ferrous Metals Resource Geological Survey, Beijing 100012; 3. Ministry of Land and Resources of the People's Republic of China, Beijing 100812; 4. Sinotech Minerals Exploration Co. ,Ltd. , Beifing 100012; 5. Faculty of Land Resource Engineering, Kunming University of Science and Technology, Kunming , Yunnan 650093 ) Tin-tungsten polymetallic mineralization is generally related to Li-F-rich alkali feldspar granites, and large-scale liquid immiscibility usual- ly occurred in its late magmatic stage. In the Limu tin-tungsten-niobium-tantalum deposit, rock masses related to the mineralization include red medium- grained alkali feldspar granite and white fine-grained alkali feldspar granite ( albite granite). The mineralization occurred near the top of the alkaline gran- ite, and the main mineralization types includ |
ISSN: | 0495-5331 |