發(fā)布時(shí)間：2018-08-04 09:21

【摘要】：南秦嶺竹山地區(qū)發(fā)育強(qiáng)烈的志留紀(jì)堿性巖漿活動(dòng),主要巖性包括正長(zhǎng)巖、火成碳酸巖、粗面巖和堿性玄武巖,侵位時(shí)間集中于450~430 Ma。該期堿性巖漿活動(dòng)主要形成于幔源堿性玄武質(zhì)巖漿結(jié)晶分異演化,巖漿源區(qū)以HIMU組分為主,具有HIMU和EMⅠ、EMⅡ多種富集地幔端員混合特征。堿性雜巖體普遍發(fā)育鈮、稀土礦化,形成了廟埡、殺熊洞、天寶等大型或超大型礦床。區(qū)域性深大斷裂及其次級(jí)斷裂控制了堿性雜巖體或堿性火山雜巖的空間展布,富堿和較高的結(jié)晶分異程度是成礦有利條件。幔源與洋殼俯沖消減、陸源沉積物再循環(huán)以及地幔流體交代作用關(guān)系密切。該期堿性巖漿-成礦事件形成于板塊邊緣巖石圈強(qiáng)烈伸展和幔源巖漿底侵上涌背景。
[Abstract]:There are strong Silurian alkaline magmatic activities in the Zhushan area of the South Qinling Mountains. The main lithology includes syenite, igneous carbonate, trachyte and alkaline basalt, and the emplacement time is concentrated at 450 Ma 430 Ma. The alkaline magmatic activity in this period was mainly formed in the crystallization differentiation and evolution of mantle derived alkaline Black Tortoise magma. The magmatic source region is dominated by HIMU components, which has the characteristics of HIMU and EM 鈪，

本文編號(hào)：2163380