%0 Journal Article
%T An in situ zircon Hf isotopic,U-Pb age and trace element study of banded granulite xenolith from Hannuoba basalt: Tracking the early evolution of the lower crust in the North China craton<br>An in situ zircon Hf isotopic,U-Pb age and trace element study of banded granulite xenolith from Hannuoba basalt： Tracking the early evolution of the lower crust in the North China craton
%A ZHENG Jianping
%A LU Fengxiang
%A YU Chunmei
%A TANG Huayun
%A <br>ZHENG Jianping
%A LU Fengxiang
%A YU Chunmei & TANG Huayun Faculty of Earth Sciences
%A China University of Geosciences
%A Wuhan
%A China
%J 科学通报(英文版)
%D 2004
%I 
%X Backscattered electron images, in situ Hf isotopes, U-Pb ages and trace elements of zircons in a banded granulite xenolith from Hannuoba basalt have been studied. The results show that the banded granulite is a sample derived from the early lower crust of the North China craton. It is difficult to explain the petrogenesis of the xenolith with a single process. Abundant information on several processes, however, is contained in the granulite. These processes in-clude the addition of mantle material, crustal remelting, metamorphic differentiation and the delamination of early lower crust. About 80% of zircons studied yield ages of 1842 ±40 Ma, except few ages of 3097-2824 Ma and 2489-2447 Ma. The zircons with ages older than 2447 Ma have high εHf (up to +18.3) and high Hf model age (2.5-2.6 Ga), indicating that the primitive materials of the granulite were derived mainly from a depleted mantle source in late Archean. Most εhf of the zircons with early Proterozoic U-Pb age vary around zero, but two have
%K granulite xenolith
%K in situ zircon analysis
%K Hf isotope
%K U-Pb dating
%K lower crust evolution
%K North China craton
%K mantle-crust interaction<br>锆石
%K 变质岩
%K 捕虏岩
%K 玄武岩
%K 稳定地块
%K 中国
%K 北部地区
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=01BA20E8BA813E1908F3698710BBFEFEE816345F465FEBA5&cid=96E6E851B5104576C2DD9FC1FBCB69EF&jid=DD6615BC9D2CFCE0B6F945E8D5314523&aid=84C52280F65EFA4368A0F9B420ECD47D&yid=D0E58B75BFD8E51C&vid=2A3781E88AB1776F&iid=38B194292C032A66&sid=CAA7BAE04CB631A1&eid=B8F8200D88DDC7D6&journal_id=1001-6538&journal_name=科学通报(英文版)&referenced_num=3&reference_num=40