| 鲁西蒙山山脉中段早前寒武纪花岗质岩石岩石学和单锆石年龄 |
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| 关键词:zircon isotopic geochronology granitoids early Precambrian west Shandong |
| 基金项目:山东省地质矿产局第二地质队资助 |
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| The Petrologic Characteristics and Sing-Zircon Dating of the Early-Precambrian TTG in the Middle of Mengshan Mountains |
| The middle of Mengshan Mountains area, i.e., Pingyi County and Mengyin County in the west Shandong Province, is the east part of the north China craton. It is a typical area for the Precambrian geological research in China. There the cropped rocks are mainly TTG. Eight samples of the TTG have been collected from Puzhaosi, Songshan, Qiuziyu, Ningzidong, Huaguozhuang, Zhougongdi, Yuliangdian and Domgjintai areas in the Counties. The zircons from the TTG were dated by using the Kober's method on the thermal ion mass spectrometer MAT261 in the Isotope Laboratory of Institute of Geology, Chinese Academy of Geological Sciences. The ages of the most of zircons are of 2 600 Ma, 2 500 Ma and 2 400 Ma, which reflect that the severe magmatic events took place at the end of Archaean and the beginning of Proterozoic. Among all of the samples, the zircons in Dongjintai biotite tonallite are the oldest, i.e., 2 868±13 Ma, 2 712±5 Ma, 2 711±7 Ma (2σ).The 2 400 Ma,which may represent the latest stage geologic action in Archaean. |
| YANG Chun,SONG Biao,YANG Miao,ZHANG Sheng-xiang,CHEN Hua-guo,GAO Ai-ping.1997.The Petrologic Characteristics and Sing-Zircon Dating of the Early-Precambrian TTG in the Middle of Mengshan Mountains[J].Acta Geoscientica Sinica,18(3):324-329. |
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