Study on the metallogenesis during the early stage of continental collision in southern Gangdese, Tibet
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摘要:
冈底斯带南部发育有大量的斑岩铜钼矿床和矽卡岩型铜铅锌多金属矿床，形成了斑岩铜矿带和多金属矿带。前人的研究表明，成矿带内的矿床形成年代大都小于30Ma，处于碰撞后期伸展构造环境。本文对冈底斯带中南部的甲龙矽卡岩型铁矿、撒当金银矿床(点)和多底沟矽卡岩型钼矿床(点)开展了年代学研究，结果显示：甲龙铁矿黑云母二长花岗斑岩的锆石LA-ICP-MS U-Pb年龄为61.1±0.4Ma，MSWD=0.94；撒当赋矿安山岩锆石LA-ICP-MS U-Pb年龄为62.6±0.5Ma，MSWD=1.51；多底沟钼矿床(点)3件辉钼矿Re-Os模式年龄为64.3±0.8Ma~69.2±3.3Ma，加权平均模式年龄为66.7±6.4Ma (MSWD=8.1)。三个矿床(点)的同位素年龄表明成岩成矿事件和印度-欧亚板块陆陆碰撞早期构造岩浆事件有关。结合前人工作，我们提出冈底斯中南部发生了大规模与陆陆碰撞早期岩浆事件有关的成矿作用，形成了大面积分布的矿床，具有良好的找矿前景，应引起更多关注。
Abstract:Many porphyry Cu-Mo and Cu-Pb-Zn polymetal deposits have been found in the southern Gangdese belt, forming a porphyry copper ore belt and a polymetal ore belt, respectively. Previous geochronologic results indicate that most deposits in the southern Gangdese belt were formed after 30Ma and in post-collisional extension evnironment. In this paper, we analyze zircon U-Pb age of igneous rocks closely associate with the Jialong skarn Fe deposit and the Sadang Au-Ag deposit, respectively, and molybdenite Re-Os age of the Duodigou skarn Mo deposit in the southern Gangdese. The Jialong biotite monzonite granite closely associated with skarn Fe deposit has zircon LA-ICP-MS U-Pb age of 61.1±0.4Ma with MSWD=0.94. The Sadang andesite closely associated with Au-Ag mineralization has zircon LA-ICP-MS U-Pb age of 62.6±0.5Ma with MSWD=1.51. The molybdenite Re-Os model ages of the Duodigou skan Mo deposit varies from 64.3±0.8Ma to 69.2±3.3Ma, with an average weight age of 66.7±6.4Ma, MSWD=8.1. Our new results suggest that the three deposits own their origin to the magmatic events triggered by early Indus-Eurasia collision. Our results, together with former work, reveal that the southern Gangdese has undergone large-scale mineralization associated with the strong magmatic activities during the early Indus-Eurasia collision. It is, therefore, suggested that the southern Gangdese could be an important target area for mineralization related to early Indus-Eurasia collision.
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Key words:
- Gangdese /
- Continental collision /
- Ore forming age /
- Tibet
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图 1
研究矿点区域地质简图(据西藏自治区地质矿产局, 1993修改)
Figure 1.
Simplified geological map of the study deposits (modified after BGMRX, 1993)
图 2
甲龙斑状黑云母二长花岗岩体(a)和撒当安山岩(b)锆石U-Pb年龄谐和图，内插为累计概率统计图
Figure 2.
Condordia plots showing the zircon U-Pb analyses of the Jialong porphyritic biotite monzonite granite (a) and the Sadang andesite (b), the inserts are probability plots
图 3
甲龙斑状黑云母二长花岗岩(a)和撒当安山岩(b)锆石样品阴极发光图
Figure 3.
CL photos of analyzed zircon grains from the Jialong porphyritic biotite monzonite granite (a) and from the Sadang andesite (b)
图 4
冈底斯带南缘地质及碰撞早期矿床布简图(据Zheng et al., 2012修改)
Figure 4.
Simplified geological map of the southern Gangdese ore belt, Tibet (modified after Zheng et al., 2012)
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