平泉县洼子店金矿区碾子沟矿段矿床地质特征

本文通过分析平泉县洼子店金矿区碾子沟矿段的成矿地质条件,认为Cu、Pb、Zn、Au、Ag矿化与围岩关联不明显,而与构造有密切关系,岩体内异常组合Mo、Bi、W、Mn、Hg、Au、Cu、Ag主成矿元素与Au、Cu相关性较高,激电异常峰值较明显的点异常由埋藏较浅的隐伏矿体所引起。矿化特征主要为细脉浸染状金(铜)矿化、接触带上金(银)矿化、斑岩中的浸染状金矿化以及地表风化残积型金矿化;矿体似层状,稳定;以黄铁矿为主,呈具自形-半自形-它形粒状结构、交代结构、填隙结构、碎裂结构等结构,以浸染状构造为主,有益、有害元素含量均微少。经历了早期磁铁矿-钛铁矿阶段,热液活动的黄铁矿阶段,形成以黄铜矿-方铅矿-闪锌矿为主,伴生少量辉铜矿、砷黝铜矿为主的硫化物阶段,之后形成细脉状、浸染状硫化物矿石,在压扭性构造活动期下,构造热液使岩石发生蚀变并伴有金矿形成。

Ping Quan county Wazidian Gold mining area Nianzigou mining block ore deposit geological characteristics

This paper analyzes the ore-forming geological conditions of the Nianzigou ore section of the Zizidian gold deposit in Pingquan County, and concludes that the correlation between Cu, Pb, Zn, Au, Ag mineralization and surrounding rock is not obvious, but is closely related to the structure. The main ore-forming elements of Mo, Bi, W, Mn, Hg, Au, Cu and Ag are highly correlated with Au and Cu. The point anomaly of the anomalous peak of the anomaly is caused by the buried shallow ore body. The mineralization features are mainly fine vein-impregnated gold (copper) mineralization, gold (silver) mineralization in the contact zone, disseminated gold mineralization in porphyry, and surface weathering residual gold mineralization; the ore body layer is layered. Stable; mainly composed of pyrite, with self-formed-semi-self-shaped--formed granular structure, metasomatic structure, interstitial structure, fragmentation structure, etc., mainly characterized by disseminated structure, beneficial and harmful element content Little. After the early magnetite-ilmenite phase and the hydrothermal activity of the pyrite stage, the formation of chalcopyrite-galena- sphalerite is mainly accompanied by a small amount of chalcopyrite and arsenic antimony ore. In the sulphide stage, fine vein-like, disseminated sulphide ore is formed. Under the period of compression and torsion tectonic activity, the hydrothermal fluid is structurally altered and accompanied by gold deposit formation.