河南省嵩县萑香洼金矿矿床地质特征

萑香洼大型构造蚀变岩型金矿床位于华北陆块南缘华山-熊耳山贵金属-多金属成矿带的东部，区内多期次构造岩浆活动频繁，成矿地质条件优越。矿体受F985主含金构造蚀变带严格控制。矿化作用分为五个阶段，其中钾长石-（金）黄铁矿阶段（Ⅱ）为主要成矿阶段。研究表明该矿床为浅成中低温岩浆期后热液金矿床，最佳成矿温度在180℃～265℃之间，成矿深度范围为0．68km～0．83km。成矿溶液总体以富钠、钙为特点，成矿流体为含卤素和碱质的水溶液，主要属于NaClH2O、CO2～H2O体系，主成矿阶段成矿溶液呈弱酸性，成矿后阶段为弱碱性。由早到晚δ^34S值从较小负值向较大负值变化，具深源硫特征。

Geological characteristics of the Huanxiangwa Au deposit in Song County of Henan Province

The Huanxiangwa gold deposit, which is a large scale structural alteration type Au deposit, is located in east part of the precious metallic-polymetallic metallogenic belt in Huashan-Xiong＇ershan on the southern edge of North China Craton. The tectonic magmatic activities in this area are very frequent with the ore-forming conditions being ascendant. The orebodies in this area are strictly controlled by F985 which is a major Au-bearing structural alteration belt. The mineralization can be classified in 5 phases, of which the K- feldspar-（Au） pyrite phase （Ⅲ ） is the maior one for ores＇ forming. The research has shown that this deposit is a postmagmatic epithermal-mesothermal Au deposit with the best ore-forming temperature being 180℃～ 265℃, as well as the ore-forming depth being 0. 68km-0. 83km. The general characteristics of the ore- forming solution are rich in elements of Na, Ca with the ore-forming fluid being the liquor containing halogen and alkali matters, which belong to the NaCl-H2O,CO2-H2O systems. The ore-forming solution in the major ore-forming phase presented in weak acid, while it presented in alkalescence in the later metallogenic phases. From earlier phase to later phase, theδ^34S value has changed from higher negative to lower negative, which indicates the characteristics of deep-source S element.