内蒙古八大关地区塔木兰沟组安山岩年代学和地球化学研究

doi:10.13686/j.cnki.dzyzy.2021.04.002

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摘要对海拉尔北部八大关地区塔木兰沟组安山岩进行的锆石U-Pb年代学、全岩地球化学等分析工作，揭示了塔木兰沟期安山岩构造背景及岩石成因意义，并探讨了蒙古-鄂霍次克缝合带构造演化史.LA-ICP-MS锆石U-Pb定年结果显示其形成于160.9~164.0 Ma.岩石地球化学特征表明，安山岩为高钾钙碱性岩石，轻重稀土分馏明显，（La/Yb）_N=9.97~26.85，Eu呈微弱负异常-弱正异常（δEu=0.71~1.11）；微量元素以富集大离子亲石元素Rb、U、Th、K，强烈亏损Sr、P、Ti，相对亏损Nb、Ta为特征.岩浆可能来源于流体交代的地幔楔，并在岩浆演化过程中经历了明显的分离结晶作用.结合区域演化史，认为八大关地区塔木兰沟组安山岩形成于蒙古-鄂霍次克洋闭合后岩石圈的伸展环境.

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关键词 ：塔木兰沟组, 安山岩, 额尔古纳地块, 蒙古-鄂霍次克洋, 内蒙古

Abstract：The paper analyzes the zircon U-Pb chronology and whole-rock geochemistry of the andesites from Tamulangou Formation in Badaguan area of northern Hailar to reveal the tectonic setting and petrogenesis of the andesites, and discusses tectonic evolution history of Mongolia-Okhotsk suture zone. The LA-ICP-MS zircon U-Pb dating results show the rocks were formed in 160.9-164.0 Ma. The lithogeochemical characteristics indicate the andesites belong to high-K calc-alkaline rock with notable fractionation of LREE and HREE,(La/Yb)_N of 9.97-26.85, and slight negative-weak positive Eu anomaly (δEu=0.71-1.11); The trace elements are characterized by enrichment of LILEs (Rb, U, Th and K), severe depletion of Sr, P and Ti, and relative depletion of Nb and Ta. The magma may be derived from the fluid-metasomatized mantle wedge and experienced obvious fractional crystallization during evolution. Combined with the regional evolution history, it is believed that the andesites in the study area were formed in the lithospheric extension environment after the closure of Mongolia-Okhotsk Ocean.

Key words： Tamulangou Formation andesite Erguna block Mongolia-Okhotsk Ocean Inner Mongolia

收稿日期: 2021-03-01

PACS:	P595
	P597

基金资助:中国地质调查局项目"内蒙古1：5万八大关牧场、郭古道阿拉山、八大关铜矿、达拉孙诺尔、查干诺尔、黑泡子幅区域地质矿产调查"（12120113053700）.

作者简介: 崔家瑞(1987-),男,工程师,主要从事区域地质、地球化学、放射性地质、工程地质等领域工作,通信地址辽宁省沈阳市沈北新区孝信街12号,E-mail//174608138@qq.com

引用本文:

崔家瑞, 韩志滨, 陈德兵, 李研. 内蒙古八大关地区塔木兰沟组安山岩年代学和地球化学研究[J]. 地质与资源, 2021, 30(4): 414-424.
CUI Jia-rui, HAN Zhi-bin, CHEN De-bing, LI Yan. GEOCHRONOLOGY AND GEOCHEMISTRY OF THE ANDESITES FROM TAMULANGOU FORMATION IN BADAGUAN AREA, INNER MONGOLIA. GEOLOGY AND RESOURCES, 2021, 30(4): 414-424.

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http://manu25.magtech.com.cn/Jweb_dzyzy/CN/10.13686/j.cnki.dzyzy.2021.04.002 或 http://manu25.magtech.com.cn/Jweb_dzyzy/CN/Y2021/V30/I4/414

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