Zircon U-Pb age and its significance of the granodiorite from Siruyidieer Pb-Zn deposit, Taxkorgan, Xinjiang, China
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摘要:
对塔什库尔干斯如依迭尔铅锌矿点与成矿作用有关的花岗闪长岩开展了系统的年代学、岩石地球化学研究工作。LA-ICP MS锆石U-Pb定年结果表明，花岗闪长岩成岩年龄为12.7±0.13Ma，与前人在塔什库尔干地区获得的苦子干和卡日巴生岩体(11Ma) 年龄在误差范围内相一致，表明斯如依迭尔铅锌矿点成矿作用发生于喜山期；岩石地球化学分析结果表明，它们为弱过铝质，具富Al、K，属于高钾钙碱性-钾玄岩系列，相对富集Rb、Ba、Th、U等大离子亲石元素(LILE)、亏损Zr、Y、Ta、Nb等高场强元素(HFSE) 和稀土总量相对较高，形成于造山后伸展构造体制。区内独特的成矿特征，是青藏高原西北缘构造转换带对主碰撞带造山作用过程响应的记录；区内独特的成矿事件，是该区在喀喇昆仑走滑断裂系统早期挤压、晚期拉张影响下，是强烈的富碱岩浆活动和成矿作用的产物。区内主干断裂及其次级断裂常常控制富碱岩浆岩体及相关矿床定位和分布。
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关键词:
- 花岗闪长岩 /
- LA-ICP-MS锆石U-Pb定年 /
- 喜山期 /
- 斯如依迭尔铅锌矿 /
- 塔什库尔干
Abstract:This paper gave detailed studies on the chronology, petrology and geochemistry of the granodiorites, which are related to the mineralization in Siruyidieer Pb-Zn deposit, Taxkorgan, Xinjiang, China. Zircon LA-ICP-MS U-Pb results yield a concorde age of 12.7±0.13Ma for the granodiorites, is consistent with the existing age (11Ma). Based on these, the Siruyidieer Pb-Zn was formed during Himalayan Period. The rocks are weak aluminum, are characterized by enrichment in aluminium and kalium, and belong to high-K calcic-alkaline-shoshonite series. In addition, the rocks have high large ion lithophile elements (LILE) (Rb, Ba, Th, U, etc.) and total rare earth element, low high field strength elements (HFSE) (Zr, Y, Ta, Nb, etc.). The granodiorites were derived from post-orogenic extensive setting. The distinctive metallogenic characteristics in study area are good record for the respond between tectonic transition zone and major collision zone in northwest of Qinghai-Tibet Plateau. Moreover, the mineralization events in this area are the result of alkali-rich magamtism and minerogenesis in different tectonic setting. The distribution of alkali-rich magama and deposits in study area are controlled by main and secondary faults.
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Key words:
- Granodiorite /
- Zircon LA-ICP-MS U-Pb dating /
- Himalaya /
- Siruyidieer Pb-Zn deposit /
- Taxkorgan
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图 1
新疆塔什库尔干地区地质简图(据胡建卫等，2010)
Figure 1.
Geological sketch map of Taxkorgan area, Xinjiang (after Hu et al., 2010)
图 2
斯如依迭尔花岗闪长岩的地球化学图解
Figure 2.
Geochemistry diagrams of the granodiorite in Siruyidieer
图 3
微量元素原始地幔标准化蛛网图(a, 标准化值据Sun and Mcdonough, 1989) 与稀土元素球粒陨石标准化配分曲线图(b, 标准化值据Boynton，1984)
Figure 3.
Primitive mantle normalized trace element spdier diagram (a, normalization values after Sun and Mcdonough, 1989) and chondrite-normalized REE patterns diagram (b, normalization values after Boynton, 1984)
图 4
斯如依迭尔花岗闪长岩锆石阴极发光(CL) 图像
Figure 4.
Cathodoluminescence (CL) images of zircon grains from the Siruyidieer granodiorite
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