【摘要】 本文旨在通过分析苏门答腊岛苏里安斑岩型铜矿至苏利特河矽卡岩型铜矿成矿带中埃达克质侵入岩及矽卡岩的岩石学和地球化学特征,探讨其成因意义。该成矿带是巴东地区辛卡拉克湖以东地球化学异常带的主体部分,其绝大多数侵入岩浆体皆为为Ⅰ-型花岗岩复合体,相当于印支晚期同碰撞火山弧和燕山早期碰撞后岩浆侵入活动的产物。该成矿带内的埃达克质花岗岩和闪长斑岩（早侏罗世和早白垩世）具有低的Y、Yb含量、高的ΣREE含量和Eu正异常,在构造环境判别图上落在活动大陆边缘（ACM）火山弧环境中。埃达克质岩浆来源于俯冲洋壳板片部分熔融。然而,矽卡岩主量元素与岩浆岩侵入体相比,其CaO含量增多,SiO₂、Al₂O₃、K₂O以及Na₂O含量降,REE普遍表现为Eu负异常。该成矿带内矿化矽卡岩与侵入岩的微量元素模式在蛛网图上显示某些相似性,但是二者的REE配分模式却不尽相同。矽卡岩的微量元素和稀土元素具有低Rb、Ba含量和K、Sr、P、Ti低谷,主要继承了原始岩浆和母岩埃达克质岩的共同特征。矽卡岩化是引起Ti、Yb、Y和REE总量降低的主导控制作用。更多还原

【Abstract】 The purpose of this paper is to study the petrological and geochemical characteristics of adakitic intrusive rocks and skarns in the metallogenic belt from Sulian porphyry copper deposit to Sulithe skarn copper deposit in Sumatra Island, and to explore their genetic significance. The metallogenic belt is the main part of the geochemical anomaly zone east of Lake Cincarack in Badong area. Most of its intrusive magmas are Itype granite complexes, which are equivalent to the products of magmatic intrusion after collision with volcanic arc and early Yanshanian in late Indosinian. The adakitic granite and dioritic porphyry(Early Jurassic and Early Cretaceous) in the metallogenic belt have low Y, Yb, high_REE and positive Eu anomalies, which fall in the active continental margin(ACM) volcanic arc environment on the discriminant map of tectonic environment. The adakitic magma originated from partial melting of subducted oceanic crust of the mineralized skarn and intrusive rocks in the metallogenic belt show some similarities on the cobweb maps, but the REE distribution patterns of the two rocks are different. The trace elements and rare earth elements of skarn have low Rb and Ba contents and K, Sr, P and Ti valleys, which mainly inherit the common characteristics of primitive magma and parent rock adakite. Skarnization is the dominant controlling factor for the reduction of total Ti, Yb, Y and REE.更多还原