摘要
采自陕豫交界秦岭群中的榴辉岩主要由石榴子石和绿辉石组成，同时还含有少量的角闪石和金红石。本工作由四个单矿物和全岩五个样，测得Sm－Nd等时年龄为400±16Ma，（r＝0．997575），εNd＝十3．6，说明在加里东期北秦岭造山带发生过高压变质事件。
Eclogite and coesite-bearing ecloGite occur in the northern part of the Qinling complex inthe Guanpo area, northern Qinling mountains. Well-preserved eclogite consists mainly of om-phacite and garnet, with minor rutile, amphibole, etc. On the basis of garnet, omphacite, rutile,amphibole and whole rock, the Sm-Nd isochron age of eclogite from northern Qinling mountains is400±16Ma (r= 0. 997 575 ), with εNd= + 3. 6, indicating that the eclogite was formed in the Caledonian cycle. The formation age and original source are different from those of the high-pressure garnet-amphibole and garnet-clinopyroxenite rocks from the Shongshugou area. This suggests thatthere have occurred two high-pressure metamorphic events in the Dabie-Qinling orogenic belt.
出处
《矿物学报》
CAS
CSCD
北大核心
1996年第4期349-352,共4页
Acta Mineralogica Sinica
基金
国家自然科学基金!48970O97
关键词
榴辉岩
同位素年龄
钐
钕
northern Qinling mountains
eclogite
Sm-Nd isochron age
