浙西南早元古代花岗质岩石的年代
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A GeochronologicaI Study on Early Proterozoic Granitic Rocks,Southwestern Zhejiang
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    摘要:

    用单颗粒锆石U-Pb稀释法获得的浙西南前寒武纪变质基底中花岗质岩石的年龄为:下际二长花岗岩1975±80Ma,里庄二长花岗岩1870±36Ma,田后花岗闪长岩1832±80Ma,三枝树混合岩1963±44Ma。这些年龄数据证实本区基底岩石在1875±100Ma时期经历了一次广泛强烈的岩浆热事件,表明八都群(麻源群)岩石的形成应早于2.0Ga。三枝树地区“鹤溪群”中混合岩年龄为1863±44Ma,斜长角闪岩全岩矿物Sm-Nd等时线年龄为2071±48Ma,表明景宁三枝树地区变质岩的时代应为早元古代,并非原来所属“鹤溪群”划归的晚古生代,这套变质岩可能是浙闽变质基底的一部分。

    Abstract:

    U-Pb isotopic ages of four Early Praterozoic granitic bodies in southern Zhejiang have been determined:Xiaji admellite 1975士180Ma, Lizhuang adme- llite 1870士136Ma, Tianhuo granodiorite 1832士80Ma, and Sanzhishu migmatite 1863士144Ma, These data show that the rocks of the Zhejiang-Fujian Preca- mbriari metamorphic basement underwent an intense magmatic thermal event in the period of 1875士100Ma.This magmatic thermal event, which resulted in migmatization, granitization and magmatic intrusion in the basement rocks, played an important role in the formation of Zhejiang-Fujian stable crystalline basement. These results also suggest that the formation of the host rocks of the granitic rocks, namely Badu (Mayuan) Group, occured be- fore 2.OGa. The 1863士44Ma U-Pb age of migmatite and 2071士48 Sm-Nd iso- chron age of amphibolite in Sanzhishu demonstrate that at least part of the "Hexi" Group is of Early Proterozoic rather than Late Paleozoic. The meta- morphic rocks in Sanshishu may be a part of Zhejiang-Fujian metamorphic 'basement.

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甘晓春,李惠民,孙大中,金文山,赵凤清,1995,浙西南早元古代花岗质岩石的年代[J].岩石矿物学杂志,14(1):1~8. Gan Xiaochun, Li Huimin, Sun Dazhong, Jin Wenshan, Zhao Fengqing,1995,A GeochronologicaI Study on Early Proterozoic Granitic Rocks, Southwestern Zhejiang[J]. Acta Petrologica et Mineralogica,14(1):1~8.

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