摘要
甲马铜多金属矿床位于西藏冈底斯火山-岩浆弧中的一个弧后盆地,并赋存于该盆地上侏罗统多底沟组礁灰岩与下白垩统林布宗组下部的砂板岩之间,矿床的含矿岩石为矽卡岩。作者在对其地质特征分析的基础上,通过其中矿物流体包裹体的特征、均一温度、包裹体成分的研究,并与典型岩浆热液接触交代矽卡岩矿物流体包裹体和现代海底热(卤)水的对比,显示该矿床层状矽卡岩矿物的形成温度、流体成分与典型岩浆热液接触交代矽卡岩存在较大差异;而与现代海底热(卤)水有较大的相似性。因此,推断甲马矿床层状矽卡岩的形成与岩浆热液没有直接的成因联系,而很有可能是与盆地演化过程中的热(卤)水活动有关。
The Jiarna copper and polyrnetal deposit is located in a back arc sedimentary basin and occurs as stratiform and stratoid bodies in the transitional zone between the reef lirnestone（J3d） and sandy slate （K1l）. Skarn as ore-bearing rock in the Jiama deposit, having particular geological characteristics, has been concerned greatly by investigators. On the basis of studies on the characters of the fluid inclusions in the minerals, such as homogenization temperature and composition, and compared with the fluid composition and temperature of the fluid inclusions from the Jiarna skarn and typical skarn-type deposits, the hot brine in modern seafloor, this article holds that the formation temperature, fluid composition of the stratabound skarn rnainerals in the Jiarna deposit are different greatly from the typical skarn-type deposits, but are comparability similar to the hot brine from modern seafloor. So, the authors conclude that the stratabound skarn of the Jiama deposit has nothing to do with magma hydrotherrnal solution, and however, has likely something to do with the hot brine in the basin.
出处
《成都理工大学学报（自然科学版）》
CAS
CSCD
北大核心
2006年第3期285-293,共9页
Journal of Chengdu University of Technology: Science & Technology Edition
基金
科技部重点基础前期研究专项(2003CCA019)
南京大学成矿作用国家重点试验室开放研究基金
原地矿部定向基金(地科97-20)联合资助项目
关键词
冈底斯
甲马
火山-岩浆弧
层控矽卡岩
流体包裹体
Gandise volcanic-magmatic arc
Jiama stratabound skarn deposit
ore-forming fluid
characteristics and origin
