现代地质Issue(4)：663-673,11.
河北雾灵山杂岩体锆石Hf同位素特征及其区域对比研究
The Hf Isotopic Characteristics of the Zircons from Wulingshan Complex in Hebei and Regional Comparative Study
摘要
Abstract
Located in Xinglong County of Hebei Province,the northern margin of North China Craton,Wuling-shan complex is a batholith with an outcrop area of 230 km2 .The complex is mainly composed of porphyry-like alkali syenite,alkaline quartz-syenite and alkali feldspar syenite porphyry.The zircon U-Pb dating for 3 samples of the earliest emplaced porphyry-like alkali syenite in the complex yielded three weighted mean ages of (128.0 ±0.6)Ma,(127.3 ±1.2)Ma and (126.8 ±0.4)Ma,respectively.It shows that the complex was intruded in the Early Cretaceous.The in situ Hf isotopic analyses of the zircons gave the two-stage model ages ranging from 1.13 to 1.75 Ga,while theεHf(t)values from -7.8 to 1.7.TheεHf(t)value combined with the petrog-raphy of dark enclave of the porphyry-like alkali syenite indicates that the Wulingshan complex was formed by mixing of different magma from crust-,lithosphere enriched mantle- and depleted mantle-derived melts.By comparing the εHf(t)values of different Early Cretaceous A-type granites occurring in the northern margin of North China Craton,we can conclude that these A-type granites were derived from different sources,with more contribution of depleted mantle composition as the time evolution.It suggests that the large-scale lithospheric thinning almost finished at that time,while the depleted mantle materials started upwelling and were involved in the magmatic activity.关键词
锆石U-Pb测年/Hf同位素/A型花岗岩/雾灵山/河北Key words
zircon U-Pb dating/Hf isotope/A-type granite/Wulingshan/Hebei分类
天文与地球科学引用本文复制引用
陈春良,江思宏,梁清玲,刘源,韩宁..河北雾灵山杂岩体锆石Hf同位素特征及其区域对比研究[J].现代地质,2014,(4):663-673,11.基金项目
国家自然科学基金项目（41030421，41273061）。 （）
