摘要
北山造山带中部发育大面积的晚志留世-早泥盆世侵入岩,多数花岗岩类显示正的εH(f t)值,反映了显著的大陆地壳增生。本次工作通过对白云山南侧晚志留世-早泥盆世石英闪长岩、花岗闪长岩的锆石Hf同位素分析,结合同时代的S-A型花岗岩的Hf同位素数据,认为伸展背景下年轻地壳熔融是北山造山带中部晚志留世-早泥盆世陆壳增生的主要方式。
A large area of the Late Silurian-Early Devonian intrusive rocks are developed in the central part of the Beishan Orogenic Belt.Most granitoids show positiveεHf(t)indicating the remarkable continental crustal accretion.Based on zircon Hf isotopic data on the Late Silurian-Early Devonian quartz diorite and granodiorite in the south Baiyunshan area,together with the Hf isotopic data of the contemporary S-/A-type granitoids,it is considered that juvenile crust under extensional background is the main continental crust accretion pattern during Late Silurian-Early Devonian.
作者
田健
段霄龙
程先钰
TIAN Jian;DUAN Xiao-long;CHENG Xian-yu(Tianjin Center of China Geological Survey,Tianjin 300170,China;North China Center for Geoscience Innovation PrecambrianResearch Centre,China Geological Survey,Tianjin 300170,China)
出处
《地质调查与研究》
2020年第3期207-211,223,共6页
Geological Survey and Research
基金
中国地质调查局项目“阴山成矿带小狐狸山和雅布赖地区地质矿产调查(DD20160039)”
“内蒙古温都尔庙-镶黄旗地区区域地质调查(DD20190038)”
关键词
晚志留世-早泥盆世
侵入岩
锆石Hf同位素
陆壳增生
年轻地壳
Late Silurian-Early Devonian
Intrusive rocks
zircon Hf isotopes
continental accretion
Juvenile crust
