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世界地质 2023, 42(3) 433-443 DOI: ISSN: 1004-5589 CN: 22-1111/P

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	花岗岩
	中志留世
	锆石 U??Pb 定年
	逊克地区
	小兴安岭北部
	本文作者相关文章
	马天宇
	赵立东
	宋志韬
	董艳秋
	高永志
	PubMed
	Article by Ma T
	Article by Zhao L
	Article by Song Z
	Article by Dong Y
	Article by Gao Y

小兴安岭北部逊克地区早古生代花岗岩年代学及岩石地球化学特征

马天宇, 赵立东, 宋志韬, 董艳秋, 高永志

黑龙江省自然资源调查院, 哈尔滨 150036

摘要：逊克岩体位于小兴安岭北部, 主要由正长花岗岩组成? 锆石 LA??ICP??MS U??Pb 定年结果表明逊克岩体形成于中志留世 (424 ± 6) Ma? 花岗岩样品具有较高的 w( SiO2 ) (65. 90% ~ 72. 63% ),富碱 w(Na2O + K2O)(8. 87% ~ 10. 18% )和 w(Al 2O3 )(13. 17% ~ 17. 15% ), 为高钾钙碱性? 准铝质岩系列岩石; 逊克岩体具有强烈的 Eu 负异常, 富集大离子亲石元素 (Rb? Th? K? Ba), 亏损高场强元素 (Nb? Ta? Ti) 和 P? Sr; 稀土元素总量高, 轻重稀土比值显示为轻稀土富集型? 岩石类型为 I 型? 低 Sr? 高 Y 特征暗示岩浆来源于中? 上部地壳的部分熔融? 结合前人研究成果, 认为小兴安岭北部中志留世花岗岩与松嫩地块和佳木斯地块的碰撞拼合有关?

关键词：花岗岩中志留世锆石 U??Pb 定年逊克地区小兴安岭北部

Natural Resources Survey Institute of Heilongjiang Province, Harbin 150036, China

MA Tianyu, ZHAO Lidong, SONG Zhitao, DONG Yanqiu, GAO Yongzhi

Natural Resources Survey Institute of Heilongjiang Province, Harbin 150036, China

Abstract: The Xunke pluton is mainly composed of syenogranite, and it is located in northern Lesser Khingan Range. LA??ICP??MS zircon U??Pb dating results indicate that the Xunke pluton was formed in the Middle Silurian (424 ± 6) Ma. The granite samples are high in w( SiO2 ) of 65. 90%??72. 63% , w(Na2O + K2O) of 8. 87%?? 10. 18% and w(Al 2O3 ) of 13. 17%??17. 15% , belonging to a high potassium?calcium?alkaline, quasi Aluminous rock series. Xunke pluton has strong negative Eu anomaly, enriched in large ionic lithophile elements (Rb, Th, K, Ba), depleted in high field strength elements (Nb, Ta, Ti) and P, Sr. The total amount of rare earth elements is high, and the ratio of light and heavy rare earth elements (LREE / HREE) suggests a light rare earth enrichment type. The rock is I type. The low Sr and high Y characteristics imply that the magma originated from partial melting of the middle and upper crust. Combined with previous research, it is suggested that the Middle Silurian granites in the northern Lesser Khingan Range are related to the collisional convergence of the Songneng and the Jiamusi massif.

Keywords: granite Middle Silurian zircon U??Pb dating Xunke area northern Lesser Khingan Range

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