河南嵩县庙岭金矿地质特征与钾长石40Ar/39Ar定年
Geological characteristics and K-feldspar 40Ar/39Ar dating of the Miaoling gold deposit in Songxian County, Henan Province
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摘要: 河南嵩县庙岭金矿位于华北陆块南缘熊耳山—外方山地区。矿床赋存于中元古界熊耳群火山岩中近南北向断裂带内，矿体呈似层状、透镜状产出，矿石具浸染状、细网脉状构造和微细粒它形粒状晶粒结构、交代结构，围岩热液蚀变有硅化、钾长石化、绢云母化、黄铁矿化等，矿化具有多阶段的特点，属破碎带蚀变岩型金矿。成矿热液蚀变矿物钾长石Ar-Ar法测年的结果：坪年龄为121.6Ma±1.2Ma，等时线年龄为117.0Ma±1.6Ma，表明矿床形成于早白垩世，与熊耳山地区祁雨沟、瑶沟等金矿床形成于同一时期，属与早白垩世构造-岩浆-流体活动有关的产物。
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关键词:
- 破碎带蚀变岩型金矿 /
- 钾长石40Ar-39Ar定年 /
- 庙岭金矿 /
- 河南
Abstract: The Miaoling gold deposit in Songxian County of Henan Province is located in the Xiong′ershan-Waifangshan area on the south margin of North China craton. The ore deposit is hosted in the Mesoproterozoic volcanic rocks of Xiong′er Group, along a NS-trending fracture zone. Ore bodies occur in layered and lenticular forms, and ores have disseminated and stockwork structure with anhedral fine-grained texture and replacement texture. Hydrothermal alterations of the wall rock include silicification, K-feldspathization, sericitization, pyritization etc. Mineralizations show multi-stage characteristics and the gold deposit is of the fracture zone altered rock type. 40Ar-39Ar plateau age and isochron age of K-feldspar are respectively 121.6Ma±1.2Ma and 117.0Ma±1.6Ma, indicating that the ore deposit was formed in Early Cretaceous, identical in age with Qiyugou, Yaogou and other gold deposits in Xiong'ershan area. They therefore may be products of structure-magma-fluid activity in Early Cretaceous. -
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