| 新疆阿舍勒铜锌矿区脆韧性剪切带中绢云母40Ar/39Ar年代学及其地质意义 |
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| 关键词:ductile shear zone Ar-Ar age Cu-Zn (VMS) deposit Ashele southwest margin of Altay Xinjiang |
| 基金项目:“十二五”国家科技支撑计划项目(编号: 2011BAB06B03-02);国土资源部公益性行业科研专项经费项目(编号: 200911007-06);国家自然科学基金项目(编号: 41272103) |
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| 40Ar-39Ar Dating of Sericite from the Brittle Ductile Shear Zone in the Ashele Cu-Zn Ore District, Xinjiang |
| The Ashele Cu-Zn (VMS) deposit is located on the southwest margin of the Altay orogen, north of the Maerkakuli deep fault in the Ertix Hercyian orogenic zone. The deposit occurs in volcanic rocks and pyroclastic rocks of the Middle and Lower Devonian Ashele Formation. After the main exhalative-sedimentary ore-forming stage, the deposit underwent metamorphic reformation, hydrothermal superimposition and supergene oxidation. The brittle ductile shear structures such as schistosity, stretching lineation, S-C fabrics, rotational porphyroclast, asymmetric pressure shadows, flow cleavage, zonal extinction of quartz are well developed in the Ashele Cu-Zn deposit. 40Ar/39Ar dating of sericite formed in the brittle ductile shear zone yielded isochron age of (251.6±2.9) Ma and plateau age of (251.2±1.6) Ma. The isochron age is coincident with the plateau age within the error range, which suggests that the timing of brittle ductile shearing deformation in the ore district is the Late Permian–Early Triassic, later than the main ductile shearing deformation age of Ertix sinistral strike-slip regional fault belt. The main metallogenic stage of the Ashele deposit occurred in the Early–Middle Devonian, and Late Permian–Early Triassic brittle ductile shear deformation played some transformation role in the deposit. |
| WU Yu-feng,YANG Fu-quan,LIU Feng,ZHOU Ming,CHEN Hong-qi.2015.40Ar-39Ar Dating of Sericite from the Brittle Ductile Shear Zone in the Ashele Cu-Zn Ore District, Xinjiang[J].Acta Geoscientica Sinica,36(1):121-126. |
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