玛浪勒铜矿床位于西藏仲巴县隆格尔乡,大地构造位置属于措勤-申扎火山岩浆弧。矿体呈脉状产于灰岩与则弄群安山岩及安山质晶屑凝灰岩的接触带及其附近。基于矿床野外地质特征、室内岩矿鉴定以及流体包裹体显微测温的研究表明:玛浪勒铜矿床至少存在2个阶段的成矿作用,即方解石-硫化物阶段和后期地下水热液叠加改造阶段。石英和方解石主要发育富液相的气液两相包裹体,其中,方解石-硫化物成矿阶段的包裹体均一温度为177-271℃,盐度w(NaCleqv)为5.26%-20.37%;地下水热液叠加改造阶段的均一温度为118-170℃,盐度w(NaCleqv)为1.91%-16.15%。成矿流体密度为0.90-1.07g/cm^3,估算成矿压力为9.16-26.84MPa,对应的成矿深度为0.92-2.68km。基于赋矿安山岩富集大离子亲石元素、亏损高场强元素的地球化学特征分析表明,该矿床形成于班公湖-怒江特提斯洋南向俯冲的构造背景下,为与火山期后热液相关的浅成低温热液矿床。区域该类型矿产勘查最新进展的综合分析表明,在措勤-申扎火山岩浆弧上寻找与火山期后热液相关铜矿床的潜力较大。
Malangle copper deposit is located in the north of Zhongba County, Tibet, and its tectonic position belongs to the Cuoqin-Shenzha volcanic arc. The ore bodies mainly occur as veins in the contact zone between limestone and volcanic rocks, or nearby the contacts. The field geological features,indoor identification of rock and minerals and the characteristics of fluid inclusion indicate that at least two mineralizing episodes occurred in the Malangle deposit: calcite-sulphide and the groundwater hydrothermal overprinting. The homogenization temperature and salinity of fluid inclusions in calcite-sulphide stage and ground-water hydrothermal overprinting stage mainly vary from 177-271, 5.26%--20.37% NaCleqv and 118-170℃ ,1.91%-16.15% NaCloqv, respectively. The density of ore-forming fluid ranges from 0.90-1.07 g/cm^3 , minerogenic pressure ranges from 9.16-26.84 MPa and the corresponding minerogenic depth varies from 0. 92--2. 68 km. The geochemical characteristics of ore bearing andesite show enrichment of LILE and depletion of HFSE, and indicate the mineralization occurred at the tectonic setting of Bangong lake-Nujiang Tethys ocean southward subduction, Malangle deposit associated with the post-volcanic hydrothermal and belong to epithermal deposit.