豫南地区与萤石成矿有关的花岗岩地质特征、岩石化学特征及其成矿规律

GraniteGeological,Rock Chemical Features Related to Fluorite Mineralization and Ore-forming Pattern in Southern Henan Area

豫南萤石成矿带分布众多萤石矿床(点),大中型萤石矿与区内华北陆块南缘燕山早白垩世花岗岩体关系密切,赋存于岩体外缘及其内外接触带内的断裂破碎带中。这些赋矿花岗岩以正长花岗岩为主、次为二长花岗岩,花岗岩具有高硅富碱低镁、钙的特征,岩石一般具有富集Rb、Th、U、K、Nb、Zr、Hf、Y、Ce元素,Sr、Ta、P、Ti等元素显著亏损特征;轻稀土富集,重稀土亏损明显,Eu负异常明显特征。通过系统收集区内地质矿产资料着重对燕山晚期赋矿花岗岩地质特征、岩石化学特征进行研究,总结该区赋矿花岗岩萤石矿成矿规律,以期对该区萤石矿找矿工作起到借鉴作用。

In the southern Henan fluorite mineralization belt has distributed numerous fluorite ore deposits(spots).Large and medium sized fluorite ores and North China landmass southern margin Yanshanian early Cretaceous granite mass in the area are closely related and hosted in granite outer margin and internal,external contact zone shattered fault zones.Those ore hosting granites are mainly syenogranite,while adamellite the second.Granite has high silicon,rich alkali,low magnesium and calcium features.Rock is generally enriched Rb,Th,U,K,Nb,Zr,Hf,Y and Ce elements,while Sr,Ta,P and Ti elements obvious deficit;LREE enriched,HREE obvious deficit and Eu negative anomaly obvious.Through systematic acquisition of the area’s geological and minerals data,emphatically studied late Yanshanian geological,lithochemical features,summarized ore hosting granite fluorite ore-forming pattern,hope can be a reference for fluorite prospecting in the area.