| 内蒙古奥尤特铜-锌矿床绢云母40Ar-39Ar同位素年龄及地质意义 |
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| 关键词:40Ar-39Ar geochronology sericite Cu-Zn deposit Aououte Inner Mongolia |
| 基金项目:国家自然科学基金项目(编号:40573025) |
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| 40Ar-39Ar Geochronology of the Aououte Cu-Zn Deposit in Inner Mongolia and Its Significance |
| Located in the easternmost part of the Early Paleozoic Chaganobo-Aououte-Chaobuleng tectono-magmatic belt along the southern edge of the Siberian plate, the Aououte deposit is an important copper-zinc deposit within the Erenhot-Dong Ujmqin Banner metallogenic belt. In order to obtain the ore-forming age, the authors measured the sericite separates from the copper-zinc sulfide ore of the Aououte deposit by the 40Ar-39Ar incremental heating method and, as a result, obtained an 40Ar-39Ar plateau age of (286.5±1.8)Ma(2σ), an isochron age of(287 ± 10)Ma(2σ) with the MSWD value of 0.45, and an initial 40Ar/36Ar value of 284 ± 74. As sericite and metallic minerals were formed almost simultaneously, and the plateau age is in agreement with the isochron age within a reasonable error range, the 40Ar-39Ar dating results of the sericite can be regarded as the ore-forming age of the Aououte copper-zinc deposit. Many researchers believe that the Aououte deposit and its neighboring mineralized areas were mostly formed during the Yanshanian orogeny. This paper, however, shows that the formation of the Aououte copper-zinc deposit was related to Late Hercynian magmatism and, after that, the deposit was exposed at the surface and subjected to weathering, leaching and enrichment. The authors believe that the isotopic age is of great significance in the study of regional geological evolution, the investigation of the ore-forming processes of metallic deposits and the exploration of concealed copper-zinc deposits in the Aououte mineralized district and its neighboring areas. |
| ZHANG Wan-yi,NIE Feng-jun,LIU Yan,JIANG Si-hong,XU Dong-qing,GUO Ling-jun.2008.40Ar-39Ar Geochronology of the Aououte Cu-Zn Deposit in Inner Mongolia and Its Significance[J].Acta Geoscientica Sinica,29(5):592-598. |
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