江西永平铜矿火烧岗岩体中流体包裹体面研究*

南京大学学报(自然科学版) ›› 2012, Vol. 48 ›› Issue (3): 316–327.

江西永平铜矿火烧岗岩体中流体包裹体面研究*

吕赞珊¹，朱筱婷^1,2**蔡逸涛¹，解国爱¹

出版日期:2015-06-05 发布日期:2015-06-05
作者简介: (1.南京大学地球科学与工程学院，南京，210093:2.中国地质调查局南京地质调查中心，南京，210016)
基金资助:
全国危机矿山找矿项日(20089935)"闽浙赣相邻区铜多金属矿床成矿规律总结研究”

Fluid inclusion planes for the Huoshaogang granite
in the Yongping copper deposit，Jiangxi，eastern China

Lv Yun-Shan¹，Zhu Xiao-Ting 1^’2，Cai Yi-Tao¹，Xie Guo Ai¹

Online:2015-06-05 Published:2015-06-05
About author: (1 .School of Earth Sciences and Engineering Nanjing University, Nanjing, 210093，China
2. Nanjing Center, China Geological Survey, Nanjing, 210016，China)

摘要/Abstract

摘要： 江西永平铜矿区的火烧岗岩体是燕山早期侵入的似斑状黑云母花岗岩，这一时期的岩浆热液活动对该区的成矿有重要意义.通过对花岗岩中流体包裹体面(FIP)的研究，可以揭示火烧岗岩体在侵位冷缺过程中受到的区域应力场变化及受应力控制的流体运移和演化特征.流体包裹体面产状数据显示，火烧岗岩体中FIP主要发育NFF向和NW向两个优势方位，且两组方向FIP的倾角近于直立，其中NFF向FIP的形成早于NW向，推断火烧岗岩体在侵位过程中先后受到NNW向的水平拉张构造应力
场和NW向的挤压构造应力场.相对应的构造事件为占太平洋板块向华南板块之卜俯冲造成大陆腹地发生从局部拉张到挤压的构造转换.显微测温数据表明，两期FIP中的流体包裹体主要类型都为NaCI- H₂O-CO₂( N)包裹体，少部分为NaCI- H₂O包裹体，流体演化的总体趋势为早期高温度、高盐度、低密度型流体向晚期低温度、低盐度、高密度型流体演化.

Abstract: The Huoshaogang granite in the Yongping copper deposit, Jiangxi province, eastern China, a porphyric biotitic granitic intrusion, emplaced at the Early Yanshanian stage.The magma hydrothermal activity is critical to ore-forming in this area.The study of fluid inclusion planes (FIPs) is a useful way to investigate the migration of gco-fluids under certain regional stress field.The attitudes of FIPs in the Huoshaogang granite show that their preferred orientations arc NEE-and NW-striking, and subvertical.The NEE-striking FIPs are cross-cut by the NW striking FIPs, indicating that the Huoshaogang granite underwent an earlier NNW-directed extension and a later NW-directed compression, which could be related to underthrusting of the Pacific oceanic plate beneath south China. Our microthermometric data reveal that the fluids arc dominantly NaCI一H2O一CO₂(N₂)type, and they evolved with declining temperatures and salinitics and rising densities with time.

吕赞珊¹，朱筱婷^1,2**蔡逸涛¹，解国爱¹
. 江西永平铜矿火烧岗岩体中流体包裹体面研究*
[J]. 南京大学学报(自然科学版), 2012, 48(3): 316–327.

Lv Yun-Shan¹，Zhu Xiao-Ting 1^’2，Cai Yi-Tao¹，Xie Guo Ai¹. Fluid inclusion planes for the Huoshaogang granite
in the Yongping copper deposit，Jiangxi，eastern China[J]. Journal of Nanjing University(Natural Sciences), 2012, 48(3): 316–327.

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