| 新疆阿尔泰克兰盆地基底发现晚寒武世—早奥陶世地层——来自LA-MC-ICP-MS锆石U-Pb年龄证据 |
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| 关键词:zircon U-Pb dating schist Late Cambrian–Early Ordovician strata Kelan Basin Altay |
| 基金项目:新疆阿勒泰地区资源补偿奖励资金项目“新疆阿尔泰山南缘克兰盆地成矿规律研究及资源潜力评价”和国土资源部公益性行业科研专项经费项目(编号: 201211073) |
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| The Discovery of the Late Cambrian–Early Ordovician Strata in the Basement of the Kelan Basin, Altay, Xinjiang: Constrains from Zircon LA-MC-ICP-MS U-Pb Dating |
| Previous researchers held that the exposed basement in the Kelan Basin, Altay, Xinjiang, is the Middle–Upper Silurian Kulumiti Group composed of schists, gneisses, granulites, and meta-sandstones and derived from terrigenous clastic rocks and volcanic rocks. In this study, LA-MC-ICP-MS U-Pb analyses of zircons from the sillimanite mica schist, biotite plagioclase hornblende schist, and amphibolite schist of the original “Kulumiti Group” at the base and in the periphery of the Kelan Basin yielded weighted mean 206Pb/238U ages of (489.7±2.5) Ma, (480.6±1.3) Ma, and (494.9±2.4) Ma, respectively, which indicate that this suite of schists was formed during 495 to 481 Ma, belonging to the Upper Cambrian–Lower Ordovician strata. This suite of rocks at the base and in the periphery of the Kelan Basin, by contrast, is considered as belonging to a new set of lithostratigraphic units, rather than the Middle–Upper Silurian Kulumiti Group, Sinian–Lower CambrianKanasi Group, and the Middle–Upper Ordovician Haba Group. This discovery plays a key role in understanding the geological setting and tectonic evolution of the Altay Orogenic Belt. |
| YANG Fu-quan,CHAI Feng-mei,LI Qiang,GU Gao-ling,YANG Cheng-dong.2017.The Discovery of the Late Cambrian–Early Ordovician Strata in the Basement of the Kelan Basin, Altay, Xinjiang: Constrains from Zircon LA-MC-ICP-MS U-Pb Dating[J].Acta Geoscientica Sinica,38(6):859-871. |
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