江西云山复式岩体的地球化学特征及与锡成矿关系探讨

江西永修县云山岩体位于九岭隆起北侧,为二云母花岗岩复式岩体,其地球化学特征表明它是一种富硅、富碱、贫钙、过铝且富轻稀土的陆壳重熔型花岗岩,岩浆分异程度较高。云山岩体中Sn、W含量较高,为锡矿床提供了丰富的成矿物质来源,岩浆侵入与构造活动为成矿作用创造了条件。岩浆在侵位过程中进行了较为彻底的结晶分异,最终成矿物质在云山复式岩体呈岩舌、岩瘤状突出转折部位内接触带构造及各次级构造中富集成矿。在总结区内找矿标志的基础上,根据区内地、矿、物、化、遥等找矿信息,共圈定邓家山-桐木坑、余白田-红花脑、周田-王家岭、大杨-刘家坪、庵塘-马颈、板家塘-板家坳、耕源、佛祖山-焦冲等预测区8处,具有一定找矿潜力。

Geochemical Characteristics and Related to Sn Mineralization of Yunshan Granitic Pluton,Jiangxi Province

The Yunshan granite is a calc-alkaline pluton composed of muscovite alkali granite,two-mica alkali feldspar granite and biotite adamellite,in the northern of Jiuling uplift.It is rich in Si,alkali,aluminum,comparatively rich in light rare earth elements,and depleted in calcium,belonging to crust-source re-melting high-differentiated granitoids.The high content of Sn and W in Yunshan granite can be provided ore-forming materials,which transported and deposited by favorable magma and structure activity.The ore-bodies are usually found as akmolith and bosse in inner contact zone of Yunshan granite and secondary structures.On the basis of summing up the regional prospecting criteria,according to the geological,geophysical,geochemical and remote sensing information,eight prospecting potential areas are pointed out：Dengjiashan-Tongmukeng,Yubaitian-Honghuanao,Zhoutian-Wangjialing,Dayang-Liujiaping,Antang-Majing,Banjiatang-Banjiaao,Gengyuan,Fozushan-Jiaochong,etc.