| 青海东昆仑哈陇休玛钼多金属矿床成矿流体特征及成矿模式 |
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| 引用本文： | 许庆林,孙丰月,李碧乐,杨延乾.青海东昆仑哈陇休玛钼多金属矿床成矿流体特征及成矿模式[J].吉林大学学报(地球科学版),2022,52(5):1512-1524. |
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| 作者姓名： | 许庆林 孙丰月 李碧乐 杨延乾 |
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| 作者单位： | 1.山东科技大学地球科学与工程学院，山东 青岛 266590
2.吉林大学地球科学学院，长春 130061
3.青海省地质调查局，西宁 810001
4.自然资源部高原荒漠区战略性矿产勘查开发技术创新中心，西宁 810001 |
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| 摘 要： | 哈陇休玛钼多金属矿床是东昆仑成矿带东段目前仅有的中型斑岩型矿床。为了查明其成矿流体性质及成矿物质来源，构建矿床成矿模式，本文进行了详细的流体包裹体和H-O-S同位素研究。流体包裹体显微测温显示，哈陇休玛矿床发育气液两相和含CO2三相两种类型包裹体，成矿流体呈现中高温（集中于280~340 ℃）、高盐度（w(NaCl),集中于6.00%~18.00%）和中等密度(集中于0.64~0.92
g/cm3）特点，成矿深度为2.4~4.1 km，形成于中浅成环境。H-O同位素显示，成矿流体具有岩浆水和大气降水混合的特征，但主体以岩浆水为主；S同位素显示，成矿物质主要来自于深部岩浆。结合区域构造演化认为，哈陇休玛矿床成矿模式为印支晚期东昆仑地区发生强烈壳幔混合作用，形成富含成矿元素的混合岩浆，含矿流体在随混合岩浆上升的过程中发生流体沸腾，并与大气降水混合冷却，导致成矿物理化学条件发生变化，促使成矿物质沉淀成矿。
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| 关 键 词： | 成矿流体 H-O-S同位素 成矿模式 哈陇休玛钼多金属矿床 |
Characteristics of
Ore-Forming Fluids and Metallogenic Model of the Halongxiuma Molybdenum
Polymetallic Deposit in East Kunlun,Qinghai Province |
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| Xu Qinglin,Sun Fengyue,Li Bile,Yang Yanqian.Characteristics of
Ore-Forming Fluids and Metallogenic Model of the Halongxiuma Molybdenum
Polymetallic Deposit in East Kunlun,Qinghai Province[J].Journal of Jilin Unviersity:Earth Science Edition,2022,52(5):1512-1524. |
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| Authors: | Xu Qinglin Sun Fengyue Li Bile Yang Yanqian |
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| Institution: | 1.
College of Earth Science and Engineering, Shandong University of Science and
Technology, Qingdao 266590, Shandong, China2.
College of Earth Sciences, Jilin University, Changchun 130061, China3.
Qinghai Geological Survey, Xining 810001, China4.Technology Innovation Center for Exploration and
Exploitation of Strategic Mineral Resources in Plateau Desert Region, Ministry of Natural Resources, Xining 810001, China |
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| Abstract: | Halongxiuma
molybdenum polymetallic deposit is the only medium-sized porphyry deposit in
the eastern part of the East Kunlun metallogenic belt. Based on the detailed
study of fluid inclusions and H-O-S isotopes, this paper finds out the nature
of ore-forming fluids and the source of ore-forming materials, and constructs
the metallogenic model of this deposit. Petrography and microthermometry of
fluid inclusions show that two types of inclusions, namely gas-liquid two-phase
and CO2 containing
three-phase, are developed in Halongxiuma deposit. The ore-forming fluids are
characterized by medium to high temperature (concentrated in 280-340 ℃), high salinity (concentrated in
6.00%-18.00%) and medium density (concentrated in 0.64-0.92 g/cm3),
and the metallogenic depth is 2.4-4.1 km, suggesting that the deposit was
formed in a meso-epithermal environment. The results of H-O isotope show that
the ore-forming fluids are derived from the mixing of magmatic and atmospheric
water, and the main component is magmatic water; The results of S isotope show
that the ore-forming materials mainly come from the deep magma. Combined with
the regional tectonic evolution, it is considered that the metallogenic model
of Halongxiuma deposit is as follows: Firstly, intense crust-mantle mixing
occurred in East Kunlun area during the Late Indosinian, producing a mixed
magma rich in ore-forming elements; Then the ore-bearing fluids boiled during
the ascent of the mixed magma and cooled down due to the addition of
JP2]atmospheric water, resulting in the changes in the physical and chemical
conditions of mineralization, and promoting the precipitation of metallogenic
materials. |
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| Keywords: | ore-forming fluid H-O-S isotope metallogenic model Halongxiuma molybdenum polymetallic deposit |
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