地球学报2018，Vol.39Issue(1)：27-36,10.DOI:10.3975/cagsb.2017.122001
黑龙江省龙江地区新太古代花岗岩的发现
The Discovery of Neoarchean Granite in Longjiang Area, Heilongjiang Province
摘要
Abstract
Reports about Early Precambrian rocks in Songnen Massif and its surrounding areas located in the eastern Xing–Meng Orogenic Belt are very insufficient. In this paper, the authors studied geochronology and geochemistry of cataclasitic granite from Daquanzi Village in Longjiang Coutry, Heilongjiang Province. The results show that the granite, having a concordia 207Pb/206Pb age of (2 579±15) Ma (n=20, MSWD=0.49) determined by zircon LA ICP MS U-Pb method, was crystallized in Late Neoarchean, thus belonging to soda-rich granite with the characteristics of trondhjemite, TTG. The discovery of Neoarchean granite is the first report in Songnen massif and its surrounding areas, which confirms that early Precambrian geological record exists in Longjiang area, thus contributing to the search for Neoarchean TTG. This discovery indicates that, in Songnen massif and its surrounding areas, there existed Neoarchean magmatic activity not merely in Paleoproterozoic, thus providing a basis for source of large quantities of Neoarchean detrital orginal zircons. This study provides new materials for the researches on remaining early geological records and geotectonic framework of Xing-Meng orogenic belt.关键词
松嫩地块/新太古代/富钠花岗岩/锆石U-Pb年龄/龙江地区Key words
Songnen massif/Neoarchean/Soda-rich granite/zircon U-Pb dating/Longjiang region分类
天文与地球科学引用本文复制引用
钱程,陈会军,陆露,庞雪娇,秦涛,汪岩..黑龙江省龙江地区新太古代花岗岩的发现[J].地球学报,2018,39(1):27-36,10.基金项目
本文由中国地质调查局地质调查项目(编号:DD20160048-01 （）
12120114085601 （）
DD20160345-17 （）
1212011220435 （）
DD20160123-03)资助.This study was supported by China Geological Survey(Nos.DD20160048-01,12120114085601,DD20160345-17,1212011220435 and DD20160123-03). （Nos.DD20160048-01,12120114085601,DD20160345-17,1212011220435 and DD20160123-03）
