中国地质2011，Vol.38Issue(2)：292-300,9.
大兴安岭东北部多宝山地区花岗岩锆石U-Pb年龄及岩石地球化学特征
Zircon U-Pb ages and geochemical characteristics of the granites in Duobaoshan area,Northeast Da Hinggan Mountains
摘要
Abstract
The Duobaoshan area in Da Hinggan Mountains is tectonically located in a fold belt between the Songneng Block and the Xing'an Block in the east of the Xingmeng oregenic belt.Large quantities of Neopaleozolc granitic rocks are distributed in this area.This lithology is mainly composed of monzonitic granite and syenogranite.SHRIMP zircon U-Pb dating yielded ages of 309.0± 3.OMa and 299.3± 2.8 Ma.Major element analyses show high SiO2 and alkali content, slightly high Al2O3 content and low MgO and CaO content.Trace element studies demonstrate the enrichment of Th, Zr.Rb, Nd, K and depletion of Ba, Sr, P, Ti.The samples are enriched in LREE (light rare earth elements) and depleted in HREE (heavy rare earth elements),suggesting a high degree of fractionation.The granites generally belong to the high-K calc-alkaline series and might have been produced by the magma that had experienced a high degree of crystallization differentiation.Petrological geochemistry shows that the granites are quite similar to S-type granite, with the material source derived from the crust.关键词
多宝山地区/花岗岩/锆石U-Pb年龄/SHRIMP/年代学/岩石地球化学Key words
Duobaoshan area / granite / zircon U-Pb age / SHRIMP / geochemical characteristicsi分类
天文与地球科学引用本文复制引用
曲晖,李成禄,赵忠海,王卓,张俭峰..大兴安岭东北部多宝山地区花岗岩锆石U-Pb年龄及岩石地球化学特征[J].中国地质,2011,38(2):292-300,9.基金项目
中国地质调查局"黑龙江多宝山地区矿产远景调查"项目(1212010781024)资助. （1212010781024）
