| 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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| 引用本文：杨淳,宋彪,潘淼,张胜祥,陈华国,高爱萍.1997.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[J].地球学报,18(3):324-329. |
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| 基金项目:山东省地质矿产局第二地质队资助 |
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| 中文摘要:用Ｋｏｂｅｒ方法测定了平邑县、蒙阴县普照寺闪长岩、松山－邱子峪二长花岗岩、周公地－花果庄－宁子洞花岗闪长岩、余粮店辉长岩和东近台英云闪长岩的锆石年龄。多数样品中的锆石反映了多于一期的地质记录，其中东近台英云闪长岩中的锆石（２８６８±１３Ｍａ、２７１２±５Ｍａ、２７１１±７Ｍａ和２５９８±６Ｍａ误差均为２σ），反映了本区最老的地质记录；部分样品中的２４００Ｍａ可能反映了太古宙最后一期的地质作用；而大部分样品中的锆石显示了２５００Ｍａ和２６００Ｍａ的地质记录，即岩浆活动多集中于２６００Ｍａ、２５００Ｍａ和２４００Ｍａ。这与太古宙末期地质活动重新加剧有关。 |
| 中文关键词:锆石 同位素地质年代学 花岗质岩石 早前寒武纪 鲁西 |
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| The Petrologic Characteristics and Sing-Zircon Dating of the Early-Precambrian TTG in the Middle of Mengshan Mountains |
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| Abstract: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. |
| keywords:zircon isotopic geochronology granitoids early Precambrian west Shandong |
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