阳山金矿床位于甘肃省文县境内,是西秦岭地区代表性的金矿床之一,其矿床成因和类型一直存在诸多争议.对阳山金矿床矿体产出特征、矿区构造、控矿构造与控岩构造的关系及矿床H、O、S同位素进行了研究.研究发现,矿体产于花岗斑岩上下盘及其富集的断层破碎带中,二者在空间上关系密切,均受背斜转折端虚脱构造和褶皱翼部层间断层的控制,受控于同一构造系统;主成矿期石英成矿主阶段流体δ18 OV-SMOW变化范围为8.75‰~10.12‰、δDV-SMOW变化范围为-82.4‰~-74.1‰,显示成矿流体主要来源于岩浆热液;毒砂、辉锑矿 δ34 S变化范围为-6.3‰~0.9‰,显示深源硫的特征;花岗斑岩中锆石LA-ICP-MS U-Pb测年年龄为214.8 Ma±6.4 Ma.综合研究认为,阳山金矿床为印支末期与岩浆作用有关的中低温岩浆热液型矿床.
Yangshan Gold Deposit,located in Wenxian County of Gansu Province,is one of the most typical gold deposits in west Qinling. However,the genesis and classification of the ore deposit have been controversial. This paper mainly discusses the relation between the characteristics of the orebody,the structure of the deposit,the ore-controlling structure and the rock-controlling structure,and studies the H,O and S isotopes in the deposit. The conclusion is that the orebody occurs in both the hanging wall and footwall of granite porphyry and its fault fracture zone. The two are closely related in space,both controlled by the fault zone located between the collapsing part of the turning point of the anticline and the wings of the fold. The δ18 OV-SMOW value of fluid in the quartz associated with mineralization ranges from 8. 75 ‰ to 10. 12‰whileδDV-SMOW from -82. 4‰to -74. 1‰,indicating a magmatic origin. Theδ34 S value of the arsenopyrite and stibnite is from -6. 3‰to 0. 9‰,indicating the origin of a deep source. The exact age of the granite porphyry obtained by single grain zircon using LA-ICP-MS is 214. 8 Ma ± 6. 4 Ma. Overall,it is concluded that Yangshan Gold Deposit belongs to a medium low-temperature hydrothermal ore deposit associated with magmatic activities in Indosinian period.
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