首页|冀东高家店金矿床成因:来自金及载金黄铁矿化学成分、流体包裹体和氢氧硫同位素的证据

冀东高家店金矿床成因:来自金及载金黄铁矿化学成分、流体包裹体和氢氧硫同位素的证据

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高家店金矿床位于华北克拉通北缘冀东矿集区中部,为典型的蚀变岩型金矿床,少部分为石英脉型,赋存于高家店岩体的花岗岩和闪长岩内,受断裂构造控制.为了探讨高家店金矿床的成因,文章对其开展了详细的矿床地质特征、金及载金黄铁矿化学成分、流体包裹体和氢氧硫同位素研究.结果表明,高家店金矿床热液成矿期包括 4 个阶段,其中Ⅱ和Ⅲ阶段为金的主要成矿阶段.黄铁矿是金的主要载体矿物,金矿物为自然金和银金矿,以独立的金矿物的形式赋存于黄铁矿中.主成矿阶段黄铁矿Fe和S含量及Fe/S元素比值揭示金矿床具有岩浆热液型的特征.主成矿阶段流体包裹体类型以富液相的两相H2O溶液包裹体为主,其次为含CO2 三相包裹体,属中温、中低盐度流体.不同成矿阶段的流体δ18OH2O值为 1.82‰～5.60‰,δD值为-83.3‰～-55.3‰,指示流体主要来自岩浆水,并有少量大气降水混入.主成矿阶段黄铁矿δ34S值为 2.40‰～5.61‰,显示地幔硫或岩浆硫特征,揭示成矿物质硫主要来自于深部岩浆.综合研究认为,高家店岩体的多期次岩浆侵入活动为金成矿提供了充足的热源及成矿流体,因而高家店金矿床成因类型为岩浆热液型.
Genesis of Gaojiadian gold deposit in eastern Hebei Province:Evidences from chemical composition of gold and gold-bearing pyrite,fluid inclusions,and H-O-S isotopes
The Gaojiadian gold deposit is located in the central part of the ore concentration area from eastern Hebei Province on the northern North China Craton.It is a typical altered rock type gold deposit,with a small portion being quartz vein type.It occurs in the granite and diorite of the Gaojiadian rock body and is controlled by fault structures.In order to explore the genesis of the Gaojiadian gold deposit,a systematic studies of deposit geology,the chemical composition of gold and gold-bearing pyrite,fluid inclusions,and H-O-S isotopes have been carried out in this paper.The results indicate that the hydrothermal mineralization period of the Gaojiadian gold deposit includes four stages,with stagesⅡandⅢbeing the main mineralization stages.Pyrite is the main carrier of gold minerals,gold minerals are divided into natural gold and silver-gold ore,accumulated within pyrite as indepen-dent gold minerals.The Fe and S content and Fe/S element ratio of pyrite during the main mineralization stage re-veal that the gold deposit has the characteristics of magmatic hydrothermal type.The type of fluid inclusions in the main mineralisation stage is dominated by liquid-rich two-phase H2O solution inclusions,followed by CO2-containing three-phase inclusions,which are medium-temperature,medium-low-salinity fluids.The δ18OH2O val-ues of the fluids in different mineralisation stages range from 1.82‰ to 5.60‰,and the δD values range from-83.3‰to～-55.3‰,indicating that the fluids are mainly from magma water,with a small amount of atmospheric precipitation mixed in.The δ34S value of pyrite in the main mineralisation stage is 2.40‰～5.61‰,showing the characteristics of mantle sulphur or magma sulphur,revealing that the sulphur of mineralisation material mainly comes from deep magma.The comprehensive study concludes that the multi-phase magmatic intrusion activities of the Gaojiadian rock body provided sufficient heat sources and metallogenic fluids for gold mineralisation,and thus the Gaogadian gold deposit is of magmatic-hydrothermal type.

pyriteEMPAfluid inclusionsH-O-S isotopesGaojiadian gold depositeastern Hebei Province

杨爱雪、吕水、许曼、邢运涛、刘海龙、韦文国、安梦莹

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河北省地质矿产勘查开发局第五地质大队(河北省海洋地质环境调查中心),河北唐山 063000

黄铁矿 电子探针 流体包裹体 氢氧硫同位素 高家店金矿床 冀东

河北科技厅重点研发项目河北省自然资源厅科研项目河北地质矿产勘查开发局科研项目河北地质矿产勘查开发局科研项目

22374201D13000024P00F2D410444H13000022P0069B410037Y13000023P0069B410163U

2024

10.16111/j.0258-7106.2024.02.010

矿床地质
中国地质学会矿床地质专业委员会 中国地质科学院矿床地质研究所

矿床地质

CSTPCD北大核心
影响因子：2.163
ISSN：0258-7106
年,卷(期)：2024.43(2)
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