Oxygen isotope composition of scheelite in magmatic-hydrothermal W deposits: Tracing fluid source and evolution process

被引：0
|
作者：
Wu K. [1 ,2 ]
Liu B. [1 ,2 ]
Wu Q. [1 ,2 ]
Li H. [1 ,2 ]
机构：
[1] MOE Key Laboratory of Metallogenic Prediction of Nonferrous Metals and Geological Environment Monitoring, Central South University, Changsha
[2] School of Geosciences and Info-Physics, Central South University, Changsha
来源：
Earth Science Frontiers | 2024年 / 31卷 / 02期
关键词：
fluid source; magmatic-hydrothermal; Nanling; oxygen isotope; scheelite;
D O I：
10.13745/j.esf.sf.2023.2.85
中图分类号：
学科分类号：
摘要：
A large number of magma tic hydrothermal tungsten deposits were formed in Nanling area in the Mesozoic with complex fluid source and evolution process. The ore deposits differ in the ore-forming granite type, intrusion depth and surrounding rock, and formed under influences of multi-stage fluid activities and meteoric water mixing. In this study the oxygen isotope composition of scheelites from different types of tungsten deposits are analyzed. The results show that scheelite related to S-type granite intrusion had the highest dmO values (5. 7%- 7.8%), and those to A- and I-type granites had the lowest (2.9%„-4.5%) and in-between (5. 6%o) <?laO values, respectively. The ore-forming fluids in the early stage were mainly magma tic water, while the contribution of meteoric water in the late stage varied, where the addition of meteoric water, which had little effect on skarnization and greisenization, had large impact on quartz vein mineralization. The c?180 values in single quartz vein scheelite grain showed high spatial heterogeneity, with a decreasing trend from core to edge, reflecting multi-stage fluid activity. The study concludes based on the §™0 data that although scheelite of the early stage had undergone magmatic differentiation, fluid exsolution and hydrothermal precipitation, it still retains some characteristics of magmatic melt; while scheelite of early-late stage can reveal the fluid source and evolution in detail. The mineralization of skarn and greisen scheelite is mainly related to intense fluid-rock interactions, while scheelite precipitation in quartz vein is mainly related to the addition of large amounts of meteoric water. © 2024 Science Frontiers editorial department. All rights reserved.
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页码：299 / 312
页数：13
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