论文部分内容阅读
通过对秦岭东段主要金红石矿床赋矿层位地质及地球化学特征的研究及对矿源层形成时的构造环境的分析 ,划分出 4种不同的成矿构造环境。中元古代以来 ,本区地壳处于强烈的陆 洋壳演化分异阶段 ,在北秦岭宽坪小洋盆、桐柏 大别古陆形成了与幔源成因有关的矿源层 ;在杨子地块北缘的被动陆缘拉张海盆形成了与沉积有关的矿源层。晚古生代以来 ,本区处于陆壳演化阶段 ,成矿构造环境为陆缘裂陷海槽环境 ,矿源层的形成与壳源岩浆有关
Through the study on the geologic and geochemical characteristics of the ore-bearing beds of the major rutile deposits in the eastern part of Qinling and the tectonic environment during the formation of the source beds, four different metallogenic tectonic settings were identified. Since the Mesoproterozoic, the crust in this area was in the stage of evolutional differentiation of the continental crust. In the Kuping small oceanic basin of North Qinling, the source rock related to mantle origin was formed in Dabie ancient land of Tongbai. In the Yangzi block north Passive margin of the margin stretches the sea basin to form the source layer associated with sedimentary. Since the Late Paleozoic, the area was in the continental evolution stage, the metallogenic tectonic environment was continental rift trough environment, and the formation of source rocks was related to crustal magma