黑龙江省龙江地区新太古代花岗岩的发现
投稿时间:2017-03-23  修订日期:2017-04-24  点此下载全文
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作者单位E-mail
钱程 沈阳地质矿产研究所 qch1985123@163.com 
陈会军 沈阳地质矿产研究所  
陆露 沈阳师范大学古生物学院  
庞雪娇 沈阳地质矿产研究所  
秦涛 沈阳地质矿产研究所  
中文摘要:松嫩地块位于兴蒙造山带东部,其内及周边地区早前寒武纪的岩石记录报道极少。笔者对黑龙江省龙江县大泉子屯碎裂岩化花岗岩进行年代学和地球化学研究表明,该岩石的锆石LA ICP MS U-Pb年龄为2579±15 Ma(n=20,MSWD=0.49),代表了花岗岩的结晶年龄,为新太古代晚期,地球化学特征显示该花岗岩为富钠花岗岩,具TTG中奥长花岗岩特征。本套新太古代花岗岩为松嫩地块及其周边地区的首次报道,证实了龙江地区存在早前寒武纪地质记录,为本区新太古代TTG岩石组合的寻找提供依据,也说明松嫩地块及其周边地区不仅存在古元古代岩浆活动记录、也存在新太古代岩浆活动记录,同时为松嫩地块及其周边大量的新太古代岩浆成因碎屑锆石的来源研究提供依据,为兴蒙造山带中残留的早期地质记录研究及兴蒙造山带的构造格局划分提供新材料。
中文关键词:松嫩地块  新太古代  富钠花岗岩  锆石U-Pb年龄  龙江地区
 
Discovery of Neo-Archean Granite in Longjiang Region, Heilongjiang Province
Abstract:Report about Early Precambrian rock records is few at Songnen Massif and its surrounding area, located in the eastern Xing-Meng Orogenic Belt. In this paper, authors study geochronology and geochemistry of cataclasitic granite from Daquanzi Village in Longjiang Country, Heilongjiang Province. Results show that the granite, having a concordia 207Pb/206Pb age of 2579±15 Ma(n=20, MSWD=0.49) using zircon LA ICP MS U-Pb method, was crystallized at late Neoarchean, and belongs to soda-rich granite, with the characteristics of trondhjemite, TTG. The finding of Neoarchean granite is the first report at Songnen Massif and its surrounding area, and confirms that early Precambrian geologic record is existed at Longjiang area, contributing to seek for Neoarchean TTG. This finding indicates that, in Songnen Massif and its surrounding area, there is Neoarchean magmatic activity not only Paleoproterozoic, providing a basis for source of mass Neoarchean detrital orginal zircons. This study provides new materials for the researches of remaining early geological records and geotectonic framework of Xing-Meng Orogenic Belt.
keywords:Songnen Massif  Neoarchean  Soda-rich granite  Zircon U-Pb dating  Longjiang region
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