Ar-Ar Dating of the Ductile Shear Zones in the Yulekenhalasu Cu-(Mo) Ore Deposit
详细信息
- 责任者：Yang Fuquan (Key Laboratory of Metallogeny and Mineral Assessment ; MLR ; Institute of Mineral Resources ; Chinese Academy of Geological Sciences ; Beijing 100037 ; China) ; Qin Jihua
- 刊名：Geotectonica et Metallogenia
- 出版年：2013
- 卷期：37(1)
- 关键词：斑岩铜矿床 ; porphyry copper deposit ; 斑岩钼矿床 ; porphyry molybdenum deposit ; 韧性剪切带 ; ductile shear zones ; 准噶尔盆地 ; Junggar Basin
- 页码：p.1-10
- 图表：illus., 1 table, 37 refs.
- 分类号：1001
- issnNo：ISSN1001-1552
- isbnNo：CN44-1595/P
摘要
The Yulekenhalasu porphyry copper-(molybdenum) deposit occurs in the diorite porphyry, porphyroid quartz monzonite, and volcanic rocks of the Beitashan Formation. Mineralization occurs as veinlet, veinlet- disseminated and stockwork. The ore-forming processes can be divided into three mineralization periods: porphyry, shear deformation and supergene. 40Ar/39Ar dating was performed on the muscovite and biotite, which yielded two plateau ages of (283.8±1.5) Ma and (277.0±2.0) Ma, and isochron ages of (285.4±3.1) Ma and (277.0±4.0) Ma, respectively. Two plateau ages are coincident with the isochron ages within error, which reflect the ductile shearing deformation in the ore district took place in the Early Permian (284~277) Ma. The ductile shearing deformation age in the Yulekenhalasu ore deposit is coincident with the age of Irtysh-Mayinebo fault belt. The porphyry Cu-(Mo) mineralization took place in the Middle Devonian (374 Ma), while the ductile shearing deformation in the Early Permian reformed the Cu-(Mo) ore deposit.
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