西藏冈底斯铜多金属成矿带基于MRAS资源评价系统的成矿预测

Based on Mineral Resource Assessment System(MRAS) for the Metallogenic Prognosis in Gangdese Metallogenic Belt,Tibet

西藏冈底斯成矿带是我国西部的重点成矿区带之一,特提斯演化与碰撞造山多阶段的构造演化和中生代以来广泛而强烈的花岗质岩浆侵入活动,在冈底斯成矿带形成了以岩浆作用为主的铜铁多金属矿床系列与矿床组合,主要的矿床类型有斑岩型铜钼矿、矽卡岩型铜铁多金属矿和热液型铅锌银矿。作者在区域地质条件、成矿规律与典型矿床研究的基础上,总结了斑岩型铜钼矿、矽卡岩型铜铁金属矿以及热液型铅锌银矿床的区域预测模型变量与与预测变量通过预测成果检验调整后各的权重,并利用MRAS资源评价系统对冈底斯成矿带进行了成矿预测,新圈出了一些重要的找矿远景区,如夏马日-弄如日铜金矿找矿远景区、则学-纳如松多铅锌银找矿远景区等,指出冈底斯成矿带的斑岩型和矽卡岩型矿床还具有进一步的找矿潜力。

As one of the most important and hopeful mineral resource potential metallogenic belt in western China, the Tibetan Gangdese metallogenic belt underwent phases of tectogenesis and large-scale granite magma intrusive rocks, and developed a large number of magmatism related Cu-Mo and Pb -Zn-polymetallic mineral ore deposits. The main deposit-type in Gangdese metallogenic belt were porphyry-type Cu-Mo deposit, Skarn-type Cu-Pb- Zn deposit and hydrotherm-type silver-bearing polymetallic ore deposit. Base on the study of metallogenic conditions, metallogenie regularity, and model deposit, the authors summarized the regional predicted model and forecasting forecasting indexes system of porphyry-type Cu-Mo deposit, Skarn-type Cu -Pb-Zn deposit and hydrotherm-type silver-bearing polymetallic ore deposit in Gangdese metallogenic belt. Using the assessment method of mineral resource assessment system（MRAS） , the metallogenic prognosis had been done for Porphyry Cu-Mo deposits, skarn-type Cu-Pb-Zn deposits and hydrotherm-type silver-bearing polymetallic deposits in Gangdese metallogenic belt. the results of metallogenic prognosis show that the magmatism related of porphyry Cu-Mo deposits, skarn-type Cu-Pb-Zn deposits and hydrotherm-type silver-bearing polymetallic deposits in Gangdese metallogenic had farther mineral resource potential.