辽宁青城子矿集区铅锌-银-金矿床硫化物化学成分及找矿意义
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P578.2

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国家重点研发计划项目(2018YFC0603804);中国地质调查局项目(12120115034001,DD2016005201)


Chemical composition and prospecting significance of sulfides in Pb-Zn-Ag-Au deposits of the Qingchengzi ore concentration area, Liaoning Province
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    摘要:

    对辽宁青城子铅锌-银-金矿床的主要矿石矿物方铅矿、闪锌矿和黄铁矿进行了显微鉴定、电子探针和ICP-MS分析,获得它们的固结顺序为:黄铁矿早于闪锌矿,二者早于方铅矿(闪锌矿交代黄铁矿,方铅矿交代前两者)。从硫化物成分空间分布可以判断成矿流体以甸南-榛子沟为中心分别向二道-喜鹊沟和大地-白云迁移。根据方铅矿固结温度(327℃)参考石英流体包裹体均一温度(322℃),限定以方铅矿为主的矿床其硫化物形成温度约为322~327℃;利用Cd在方铅矿-闪锌矿分配系数温度计获得铅锌矿成矿温度在344~464℃之间,结合闪锌矿出溶黄铜矿温度(高于350℃),参考石英流体包裹体均一温度(300~360℃),并参考黄铁矿发生脆性变形温度(400℃),获得以闪锌矿为主的矿床硫化物形成温度约为360~400℃,银铅锌矿床的成矿温度被限定在390~400℃;由于自然金主要赋存在黄铁矿微裂隙中,利用黄铁矿发生脆性变形温度并结合石英流体包裹体温度(230~370℃)约束金成矿温度约为370~400℃。成矿温度较高可能归因于样品采集位置较深所致;最后利用矿石矿物、侵入岩、围岩微量元素对比分析判断成矿流体与中生代(特别是印支期)侵入岩具有亲缘性,根据印支期岩浆混合特征认为岩浆混合作用可能对本地区成矿作用具有重要贡献。

    Abstract:

    For the purpose of clarifying the ore-forming fluid and the origin of the lead-zinc-silver-gold deposit, the authors used galena, sphalerite and pyrite for microscopic identification, electron microprobe analysis and ICP-MS analysis. The results show that their consolidation sequence is pyrite, followed by sphalerite (altered pyrite by sphalerite) and galena (altered sphalerite and pyrite by galena). From the spatial distribution of sulfides composition, the authors detected that the migrated pathway of ore-forming fluid was from Diannan-Zhenzigou to Erdaogou-Xiquegou and Dadi-Baiyun, respectively. The formation temperature of sulfides dominated by galena is about 322~327℃ according to the consolidation temperature of galena (327℃) and the uniform temperature of quartz fluid inclusions (322℃). Meanwhile, the sulfide formation temperature of sulfides dominated by sphalerite is about 360~400℃ with reference to the uniform temperature of quartz fluid inclusion (300~360℃), the temperature of chalcopyrite dissolved from sphalerite (>350℃), the temperature of galena-sphalerite formation (344~464℃) using the Cd partition coefficient thermometer in galena-shpalerite and the experimental brittle deformation temperature (about 400℃) of pyrite, but the ore-forming temperature of Ag(Pb-Zn) ore deposits was limited to 390~400℃. Since natural gold mainly occurs in pyrite micro-fractures, the brittle deformation temperature of pyrite (about 400℃) and the temperature of quartz fluid inclusions (230~370℃) constrain the metallogenic temperature of gold to about 370~400℃. The higher metallogenic temperature of Ag(Pb-Zn) and gold deposits may be attributed to the deeper location of the samples collected. At last, the relative relationship between the ore-forming fluid and the Mesozoic (especially the Indosinian period) magmatic rocks was judged by the comparative analysis of trace elements. According to the characteristics of the Indosinian magmatic mixing, it is considered that the magmatic mixing might have contributed to the mineralization in this area.

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李德东,王玉往,邱金柱,王伟,李生辉,周国超,张志超,2020,辽宁青城子矿集区铅锌-银-金矿床硫化物化学成分及找矿意义[J].岩石矿物学杂志,39(6):665~684.

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  • 收稿日期:2020-07-09
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  • 在线发布日期: 2020-11-13
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