【摘要】 苏云河钼矿位于西准噶尔西部,巴尔鲁克山西段,是近年发现的大型斑岩型钼矿。矿区Ⅱ号岩体主要为灰—灰白色二长花岗斑岩及斑状二长花岗岩,发育较强钼铜矿化。岩体高硅,中等富碱,A/CNK=0.98~1.06,σ=1.39~2.18,为高钾钙碱性系列弱过铝质花岗岩,经过了较强烈的分异演化;稀土总量较低,轻重稀土分馏弱,Eu负异常较明显,相对富集Rb、Th、U、K等,亏损Ba、Sr、P、Ti等。岩体应源于新元古代新生基性下地壳的部分熔融,形成于晚石炭世俯冲相关的岛弧环境。结合前人研究,认为Ⅱ号岩体和Ⅰ号岩体源区相同(似),分离结晶作用导致其发育不同的成矿元素组合;Ⅱ号岩体的形成演化为区内斑岩型钼、铜矿化提供了重要条件。更多还原

【Abstract】 The Suyunhe molybdenite deposit located in the western part of Barluk mountain of western Junggar,is a large-sized porphyry deposit discovered in recent years.The strong copper-molybdenum mineralization is relatively associated with No.2 granitic pluton in the deposit area and the plutonic intrusions are predominantly monzonitic granite porphyry and porphyritic monzonitic granite.The intrusive rocks are characterized by high Si O2,rich alkali content accompanied with a range of A/CNK ratio from 0.98 to 1.06 and the range of σvalue from 1.39 to 2.18,which indicates that the pluton belongs to the high potassium calc alkaline and weakly peraluminous granite series and experienced a strong differentiation and evolution process.The REE concentrations are low,and there is unobvious differentiation between LREE and HREE with obvious Eu negative anomaly.The rocks are relatively enriched in elements such as Rb,Th,U and K etc.,and depleted in elements of Ba,Sr,P and Ti etc..The magma mainly originated from partial melting of Neoproterozoic newborn mafic lower crust,formed in the Late Carboniferous continental margin arc environment.In combination of previous study,it is thought that No.1 granitic intrusion,and No.2 granitic intrusion has similar original source.The fractional crystallization of magma led dissimilar mineralization.Formation and evolution of the No.2 granitic intrusion provided important conditions for porphyry copper and molybdenum mineralization in the region.更多还原