CAJ | 학술논문

提位于冈底斯中北部地区的日阿铜多金属矿床是尼雄矿田铜成矿作用的典型代表，是措勤—申扎铁铜多金属成矿带的重要组成部分。本文对矿床成矿岩体黑云母花岗岩进行了矿物电子探针、主量元素、微量元素分析并用LA?ICP?MS技术对其中的锆石进行了U-Th-Pb同位素测定。结果表明，黑云母花岗岩属钾玄岩系列，为典型的I型花岗岩，源区为壳幔混合来源，获得锆石U?Pb年龄为（89.9±1.6）Ma，与矿区基性侵入岩年龄一致。结合前人研究成果，认为矿区晚白垩世早期的双峰岩浆活动与成矿作用关系密切。综合矿区所处大地构造环境，认为矿区岩浆活动受北侧的班公湖—怒江洋壳和南侧雅鲁藏布江洋壳俯冲的双重控制。
제위우강저사중북부지구적일아동다금속광상시니웅광전동성광작용적전형대표，시조근—신찰철동다금속성광대적중요조성부분。본문대광상성광암체흑운모화강암진행료광물전자탐침、주량원소、미량원소분석병용LA?ICP?MS기술대기중적고석진행료U-Th-Pb동위소측정。결과표명，흑운모화강암속갑현암계렬，위전형적I형화강암，원구위각만혼합래원，획득고석U?Pb년령위（89.9±1.6）Ma，여광구기성침입암년령일치。결합전인연구성과，인위광구만백성세조기적쌍봉암장활동여성광작용관계밀절。종합광구소처대지구조배경，인위광구암장활동수북측적반공호—노강양각화남측아로장포강양각부충적쌍중공제。
The Ri’a copper-polymetallic deposit, as a typical representative copper metallogenesis of the Nixiong orefield and an <br> important part of Cuoqin-Shenzha iron-copper metallogenetic belt, is located in the middle north of Gangdise. The authors analyzed the mineral composition, major elements, trace elements, and U-Th-Pb composition of zircon from biotite granite associated with copper mineralization in the Ri’a copper polymetallic deposit by LA-ICP-MS. The results show that the biotite granite has typical characteristics of I-type granite, belongs to shoshonite series and must have originated from a crustal-mantle provenance. Zircon U-Th-Pb dating yielded 206Pb/238U age of(89.9±1.6)Ma, which is consistent with the age of mafic intrusive in the Ri’a copper-polymetallic deposit. Combined with the results of previous studies, the authors hold that the bimodal magmatism of Early Late Cretaceous was closely related to mineralization of the Ri’a copper-polymetallic deposit. In consideration of the tectonic environment, the authors propose that the magmatism was controlled by the subduction of both Bangong Co-Nujiang ocean crust and Brahmaputra ocean crust.