摘要
佳木斯地块形成与演化一直是地质学者研究的热点之一,笔者对黑龙江省东部佳木斯地区八角山岩体进行了锆石LA-ICP-MS U-Pb测年,结果显示:锆石206 Pb/238 U加权平均年龄为(207.15±0.86)Ma,岩体的形成时代应为晚三叠世。稀土元素特征为轻稀土富集,具正铕异常;微量元素Cr、Th、Sr元素相对富集,而Cs、Zr元素相对亏损。该岩体可能形成于古亚洲洋闭合后的伸展环境。
The formation and evolution of the Jiamusi massif has always been one of the hot spots of geologists.The authors have made zircon LA-ICP-MS U-Pb dating of the Bajiaoshan pluton in Jiamusi area,Eastern Heilongjiang Province.The results show that weighted average age of zircon 206 Pb/238 U is(207.15±0.86)Ma.The formation age of the pluton should be Late Triassic.The REE is characterized by enrichment of LREE with positive Eu anomaly;the trace elements Cr,Th,Sr are relatively enriched,however Cs,Zr are relatively deficient.The pluton may have been formed in an extensional environment after the closure of the paleo Asian Ocean.
作者
王建民
颜秉超
WANG Jian-min;YAN Bing-chao(Heilongjiang Natural Resources Investigation Institute,Harbin 150036,Heilongjiang,China;Information Centre of Geology and Mineral Resources of Jilin Province,Changchun 130061,Jilin,China)
出处
《吉林地质》
2020年第3期65-71,共7页
Jilin Geology
