CAJ | 학술논문

玉龙斑岩铜矿带扎拉尕斑岩铜钼矿床位于玉龙斑岩铜矿带中北部,赋矿岩体侵入下二叠统火山岩及三叠系砂泥岩中,主要由早阶段为二长花岗斑岩及晚阶段正长花岗斑岩组成。分析了早阶段二长花岗斑岩及晚阶段正长花岗斑岩锆石 LA-ICP-MS U-Pb 年龄。早阶段二长花岗斑岩该年龄为(38.5±0.2) Ma, MSWD=1.12,晚阶段正长花岗斑岩该年龄为(38.5±0.2) Ma, MSWD=1.08,早阶段和晚阶段含矿斑岩体锆石U-Pb 年龄完全一致。这表明早晚两阶段成矿岩体是在很短的时间间隔内形成的。扎拉尕赋矿斑岩体形成年龄为(38.5±0.2) Ma。据扎拉尕斑岩矿床形成时代及藏东地区在始新世至渐新世地质构造背景,提出扎拉尕斑岩矿床和玉龙斑岩铜矿带的形成与印度板块-欧亚板块碰撞在藏东地区形成的走滑构造活动诱发的岩浆活动有关,为陆陆碰撞走滑构造环境的斑岩矿床。
옥룡반암동광대찰랍소반암동목광상위우옥룡반암동광대중북부,부광암체침입하이첩통화산암급삼첩계사니암중,주요유조계단위이장화강반암급만계단정장화강반암조성。분석료조계단이장화강반암급만계단정장화강반암고석 LA-ICP-MS U-Pb 년령。조계단이장화강반암해년령위(38.5±0.2) Ma, MSWD=1.12,만계단정장화강반암해년령위(38.5±0.2) Ma, MSWD=1.08,조계단화만계단함광반암체고석U-Pb 년령완전일치。저표명조만량계단성광암체시재흔단적시간간격내형성적。찰랍소부광반암체형성년령위(38.5±0.2) Ma。거찰랍소반암광상형성시대급장동지구재시신세지점신세지질구조배경,제출찰랍소반암광상화옥룡반암동광대적형성여인도판괴-구아판괴팽당재장동지구형성적주활구조활동유발적암장활동유관,위륙륙팽당주활구조배경적반암광상。
The Zalaga porphyry Cu-Mo deposit is located at the northern domain of the Yulong porphyry copper ore belt in the eastern Tibet. The porphyry emplaced into the lower Permian volcanic rock and Late Triassic sandstone and could be divided into early stage monzonite granite porphyry and late stage syenogranite porphyry. Both stages of the porphyry were dated, respectively, using zircon LA-ICP-MS U-Pb method. The early stage monzonite granite porphyry has zircon LA-ICP-MS U-Pb age of (38.5±0.2) Ma, MSWD=1.12 and the late stage syenogranite porphyry has zircon LA-ICP-MS U-Pb age of (38.5±0.2) Ma, MSWD=1.08. The early porphyry has the same zircon LA-ICP-MS U-Pb age as that of the late stage porphyry, suggesting that the early porphyry and late stage porphyry emplaced almost at the same time and that the Zalaga porphyry was emplaced during the Late Eocene. Based on the structural condition of the period during Eocene to Oligocene in eastern Tibet, it is concluded that the Zalaga porphyry Cu-Mo(Au) deposit and the Yulong porphyry copper ore belt has genetic relation to the activities of strike-slip fault zone which transverses the lithosphere mantle and triggered the magmatic activities caused by the collision between Indian and Asia continents.