黑龙江富源沟晚三叠世中-基性火山岩的厘定及地质意义

doi:10.13686/j.cnki.dzyzy.2023.06.003

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摘要黑龙江省西北部漠河市西部地区新厘定出非正式填图单元——富源沟中-基性火山岩,其岩石组合为灰色、灰绿色玄武安山岩、辉石玄武岩、英安质火山碎屑岩等. 获得安山岩LA-ICP-MS锆石U-Pb测年的加权平均年龄为245±3 Ma,其最小的岩浆锆石²⁰⁶Pb/²³⁸U谐和年龄为201±2 Ma,另外获得火山口附近英安质火山角砾岩加权平均年龄为201±1 Ma,其形成时代应为晚三叠世. 岩石地球化学特征显示,富源沟中-基性火山岩为一套钙碱性系列岩石,富集大离子亲石元素Ba、K、Sr等和轻稀土元素,亏损高场强元素Nb、Ta、Ti、P等和重稀土元素,具有弧岩浆岩地球化学特征. 该火山岩的厘定说明,大兴安岭北部地区存在晚三叠世中-基性火山岩浆活动事件. 综合本区火山岩的特征并结合区域上研究成果,认为其形成与蒙古-鄂霍次克大洋板片南向俯冲作用相关.

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关键词 ：中-基性火山岩, 岩浆活动, 锆石U-Pb年龄, 晚三叠世, 蒙古-鄂霍次克洋, 黑龙江省

Abstract：The Fuyuangou intermediate-basic volcanic rocks, composed of gray-grayish green basalt andesite, pyroxene basalt and dacite pyroclastic rocks, is a newly identified informal mapping unit in the western Mohe City of northwest Heilongjiang Province. The LA-ICP-MS zircon U-Pb dating results yield the weighted mean age of andesite of 245±3 Ma, and the minimum ²⁰⁶Pb/²³⁸U concordia age of magmatic zircon is 201±2 Ma. Besides, the weighted mean age of dacitic volcanic breccia near the crater is 201±1 Ma, indicating that it was formed in Late Triassic. The lithogeochemical characteristics show that the Fuyuangou intermediate-basic volcanic rocks, belonging to calc-alkaline series, are enriched in LILEs(Ba, K and Sr) and LREEs, and depleted in HFSEs(Nb, Ta, Ti and P) and HREEs, with the geochemical features of arc magmatic rocks. The determination of the volcanic rocks suggests an intermediate-basic volcanic magmatic activity event in Late Triassic in the northern Daxinganling Mountains. Combined the characteristics of the volcanic rocks in the area with regional research results, it is considered that the formation of the volcanic rocks is related to the southward subduction of Mongol-Okhotsk oceanic slab.

Key words： intermediate-basic volcanic rock magmatic activity zircon U-Pb dating Late Triassic Mongol-Okhotsk Ocean Heilongjiang Province

收稿日期: 2021-07-26

PACS:

P597

基金资助:中国地质调查局项目"内蒙古1:5万洛古河、兴华沟林场、阿凌河、1072.3高地幅区域地质矿产调查"(DD2016007803),"全国陆域及海区地质图件更新与共享"(DD20190370).

作者简介: 王文东(1985-),男,高级工程师,主要从事区域地质研究工作,通信地址黑龙江省哈尔滨市南岗区保健副路1号,E-mail//bedrock@yeah.Net

引用本文:

王文东, 刘涛, 周传芳, 杨华本, 杜兵盈, 刘宇崴. 黑龙江富源沟晚三叠世中-基性火山岩的厘定及地质意义[J]. 地质与资源, 2023, 32(6): 670-680.
WANG Wen-dong, LIU Tao, ZHOU Chuan-fang, YANG Hua-ben, DU Bing-ying, LIU Yu-wei. IDENTIFICATION OF THE LATE TRIASSIC FUYUANGOU INTERMEDIATE-BASIC VOLCANIC ROCKS IN HEILONGJIANG PROVINCE: Geological Implication. GEOLOGY AND RESOURCES, 2023, 32(6): 670-680.

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