新疆额尔齐斯构造带哲兰德金矿白云母<sup>40</sup>Ar/<sup>39</sup>Ar同位素年龄及地质意义

刘国仁; 李彦; 王蕊; 王海培; 杨成栋; 陈琦; 祁世军

doi:10.15898/j.cnki.11-2131/td.201707130118

新疆额尔齐斯构造带哲兰德金矿白云母⁴⁰Ar/³⁹Ar同位素年龄及地质意义

⁴⁰Ar/³⁹Ar Dating of Muscovite from the Zhelande Au Deposit, Irtysh Tectonic Zone, Xinjiang and Its Geological Implications

摘要

摘要: 哲兰德金矿是额尔齐斯构造带上重要的造山型金矿，产出于韧性剪切带中，金矿化赋存于黄铁矿化闪长岩脉、含金石英脉和黄铁矿化千枚岩中，矿化与韧脆性剪切变形有关。沿剪切面理发育的白云母、绿泥石等新生矿物，为测定金矿形成时代提供了依据。本研究利用白云母⁴⁰Ar/³⁹Ar年代学手段，确定了韧性剪切带的形成时代和金成矿时代。结果表明白云母坪年龄为295.4±1.6 Ma，韧性剪切变形和金成矿作用发生在295 Ma，略早于多拉纳萨依金矿形成时间。结合前人资料认为，新疆额尔齐斯构造带造山型金矿形成于295~270 Ma。

Abstract:
BACKGROUNDThe Zhelande gold deposit is an important orogenic gold deposit in the Irtysh tectonic belt. This deposit is hosted in the ductile shear zone. Mineralization occurs as gold-bearing pyritized diorite veins, gold-bearing quartz veins, and gold-bearing pyritized phyllite. The mineralization is related to the brittle-ductile shear deformation. Muscovite, chlorite and other new minerals occurred in the shear surface.
OBJECTIVESTo determine the metallogenic age by ⁴⁰Ar/³⁹Ar method.
METHODSMuscovite ⁴⁰Ar/³⁹Ar dating was used to constrain the timing of ductile shear deformation and gold mineralization.
RESULTSResults show that the plateau age of the muscovite is 295.4±1.6 Ma, suggesting that the ductile shear deformation and gold mineralization occurred at about 295 Ma, slightly earlier than the formation of the Duolanasayi gold deposit.
CONCLUSIONSCombined with previous data, the orogenic gold deposits in the Irtysh tectonic belt of Xinjiang possibly formed at 295-270 Ma.

HTML全文

参考文献(25)

施引文献

资源附件(0)

新疆额尔齐斯构造带哲兰德金矿白云母40Ar/39Ar同位素年龄及地质意义

40Ar/39Ar Dating of Muscovite from the Zhelande Au Deposit, Irtysh Tectonic Zone, Xinjiang and Its Geological Implications

新疆额尔齐斯构造带哲兰德金矿白云母⁴⁰Ar/³⁹Ar同位素年龄及地质意义

⁴⁰Ar/³⁹Ar Dating of Muscovite from the Zhelande Au Deposit, Irtysh Tectonic Zone, Xinjiang and Its Geological Implications