摘要
作者首次于浙西南地区发现中国东南大陆边缘目前已知的最古老的吕梁期岩浆花岗岩类,铬石U-Pb年龄为1878±27Ma,它们侵位于下元古界八都群(2050—2500Ma)的中下部,主要岩性有花岗岩、花岗闪长岩、石英二长岩和淡色花岗岩,后者与斜长角闪岩共生,具有与芬兰Kalanti辉长岩-奥长花岗岩岩套分子相似的REE模式和成因,前几种花岗岩类则与长英质片麻岩共生,系陆壳重(深)熔作用的产物。
The authers frist discovered PalaeoProterozoic magma typy of granites in longquan area of SW Zhejing, which are the oldest (?) the continental margin if SE China。Zircon U-Pb in the granite is 1 878±27 Ma(20). The granites emplace in the lower-middle metamorphic rock sevis of Palaeoproterozoic Bada Group(2.05-2.50Gp). The major types of rocd include granite, granodiorite, admellite and yosemitite. The latter is in paragenesis with amphibolite and has REE distribution pattern and genesis similar Fenland Kalanti gabbroid-trondhjemites suite. The other granites are in paragenesis with felsic gneiss, beonging to crustal anatexitic granite of Palaeoproterozoic metamorphic cycle.
出处
《矿物岩石》
CAS
CSCD
1991年第3期29-39,共11页
Mineralogy and Petrology
关键词
花岗岩
地质
早元古代
成因
浙江
granite, matamorphic formation, Palaeoproterozoic, Zhejiang
