高级检索
    国显正, 贾群子, 李金超, 孔会磊, 栗亚芝, 许荣科, 南卡俄吾. 东昆仑热水钼矿区似斑状黑云母二长花岗岩元素地球化学及年代学研究[J]. 中国地质, 2016, 43(4): 1165-1177. DOI: 10.12029/gc20160404
    引用本文: 国显正, 贾群子, 李金超, 孔会磊, 栗亚芝, 许荣科, 南卡俄吾. 东昆仑热水钼矿区似斑状黑云母二长花岗岩元素地球化学及年代学研究[J]. 中国地质, 2016, 43(4): 1165-1177. DOI: 10.12029/gc20160404
    GUO Xian-zheng, JIA Qun-zi, LI Jin-chao, KONG Hui-lei, LI Ya-zhi, XU Rong-ke, Namhka Norbu. Geochemical characteristics and geochronology of porphyroid biotite monzogranite from the Reshui Mo polymetallic deposit, East Kunlun Mountains[J]. GEOLOGY IN CHINA, 2016, 43(4): 1165-1177. DOI: 10.12029/gc20160404
    Citation: GUO Xian-zheng, JIA Qun-zi, LI Jin-chao, KONG Hui-lei, LI Ya-zhi, XU Rong-ke, Namhka Norbu. Geochemical characteristics and geochronology of porphyroid biotite monzogranite from the Reshui Mo polymetallic deposit, East Kunlun Mountains[J]. GEOLOGY IN CHINA, 2016, 43(4): 1165-1177. DOI: 10.12029/gc20160404

    东昆仑热水钼矿区似斑状黑云母二长花岗岩元素地球化学及年代学研究

    Geochemical characteristics and geochronology of porphyroid biotite monzogranite from the Reshui Mo polymetallic deposit, East Kunlun Mountains

    • 摘要: 热水钼矿区处于东昆仑造山带东段,大地构造位置位于北昆仑岩浆弧,区内侵入岩较发育,其中与热水钼多金属矿密切相关的矿化似斑状黑云母二长花岗岩岩相学及地球化学数据显示,SiO2含量在67.64%~71.09%,铝饱和指数(A/CNK)为0.86~1.11,为准铝质到过铝质,K2O/Na2O值1.35~2.32,里特曼指数为1.73~1.99,属于高钾钙碱性I型花岗岩。岩石总体上富集大离子亲石元素Rb、Th、U、K、Pb等,明显亏损高场强元素Ta、Nb、Ce等,贫P、Ti。稀土元素总量(ΣREE)为94.27×10-6~127.44×10-6,平均为110.92×10-6,稀土元素配分曲线呈右倾型,具有较明显的轻稀土富集、重稀土亏损的特征,弱到中等程度的负铕异常。LA-ICP-MS锆石U-Pb年龄为(230.9±1.4)Ma,形成于印支期,钼多金属矿与这一时期岩浆活动密切相关。综合分析表明,似斑状黑云母二长花岗岩形成构造体制转换阶段,在热水地区具有寻找斑岩型矿床潜力。

       

      Abstract: The Reshui Mo polymetallic deposit is located at the North Kunlun magmatic arc, where lots of intrusive rocks occur. Geochemical data reveal that the porphyroid biotite monzogranite from East Kunlun is rich in silicon (67.64%-71.09%), Al2O3 (13.8%-14.57%), Na2O(2.23%-3.02%), and K2O(3.95%-5.18%), with ratios of K2O/Na2O being 1.35-2.32 and A/CNK being 0.86-1.11, 1.01 on average, suggesting that the granite should belong to high potassic calc-alkaline and I type granite. The porphyroid biotite monzogranite is intensively depleted in HFSE (Ta, Nb, mCe), enriched in LILE (Rb, Th, U, K, Pb), and poor in P, Ti. The total rare earth elements (ΣREE) are 94.27×10-6-127.44×10-6, with an average of 110.92×10-6. The rare earth element distribution curve shows the right-inclined type, and has characteristics of obvious enrichment of light rare earth and depletion of heavy rare earth elements. LA-ICP-MS zircon U-Pb dating shows that the formation age of the rock is (230.9±1.4) Ma, belonging to Indosinian stage. The molybdenum polymetallic deposit is closely related to the magmatic activity during this period. Based on tectonic history and the structure environment in combination with the geochemical characteristics, the authors hold that the porphyritic biotite monzonitic granite of the Reshui deposit was formed at the structural transformation stage, and Rershui area has potential for finding porphyry deposits.

       

    /

    返回文章
    返回