摘要
河南省三门峡市曲里石英闪长斑岩中锆石的阴极发光图像显示其具有两种类型,即具有细微震荡环带的自形锆石和具有继承核与生长边的浑圆状锆石。具有细微震荡环带岩浆锆石的SHRIMPU-Pb年龄(117.7±1.6Ma)显示该石英闪长斑岩体的形成时间为早白垩世;浑圆状锆石核部SHRIMPU-Pb谐和年龄为620Ma和219Ma,这表明该石英闪长斑岩的母岩浆可能起源于经历了超高压变质作用改造的华南地块基底物质的部分熔融。
Cathodoluninescence (CL) images show that there are two types of zircon in the Quli quartz diorite porphyry, Sanmenxia City, Henan Province, i.e. euhedral zircond with fine oscillatory zoning and rounded zircons with an inherited core and growth rims. SHRIMP U-Pb dating of the zircons with fine oscillatory zoning of magmatic origin indicates that quartz diorite porphyry was formed at 117.7±1.6 Ma (Early Cretaceous). SHRIMP U-Pb concordia ages of the cores of rounded zircons are 620 and 219 Ma, suggesting that the parental magma for the quartz diorite porphyry may have been derived from partial melting of basement materials of the South China block that had been modified by ultrahigh-pressure metamorphism.
出处
《中国地质》
CAS
CSCD
2004年第4期379-383,共5页
Geology in China
基金
国家自然科学基金项目(40172030和40133020)资助。
