黑龙江二股营林场二长花岗岩地球化学特征及成因

现代矿业 ›› 2016, Vol. 32 ›› Issue (10): 91-95.

黑龙江二股营林场二长花岗岩地球化学特征及成因

江峰¹，李慧¹，张国宾²

1.黑龙江省有色金属地质勘查局七〇三队；2.辽宁工程技术大学地质工程系

出版日期:2016-10-25 发布日期:2016-11-25
基金资助:
* 黑龙江省矿产资源勘查基金项目( 编号: SD2002—022，SD20050—36)

Petrogeochemistry Characteristics and Genesis of the Monzonitic Granite in Erguying Forest Farm in Heilongjiang Province

Jiang Feng¹，Li Hui¹，Zhang Guobin²

1.The 703 team of Nonferrous Metals of Geology and Mineral Investigation Bureau of Heilongjiang Province；2.Department of Geology, Liaoning Technical University

Online:2016-10-25 Published:2016-11-25

摘要/Abstract

摘要： 黑龙江二股营林场二长花岗岩位于小兴安岭东北部，为伊春—延寿岩浆构造带的重要组成部分。在分析区域地质背景的基础上，结合相关测试结果，对区内二长花岗岩地球化学特征及成因进行了详细讨论，结果表明：①二长花岗岩具有富硅（w(SiO₂)65.23%~71.20%）、高铝（w(Al₂O₃)13.46%~17.07%）、富碱（w(Na₂O+K₂O)6.56%~8.27%）的特征，为偏铝质高钾钙碱性岩石系列；②二长花岗岩相对富集大离子亲石元素（如K、Rb、Ba）和化学性质活泼的不相容元素（如U、Th），相对亏损高场强元素（如Nb、Sr、Ti）及重稀土元素（如Y、Yb、Lu），具有与I型花岗岩相似的地球化学特征；③二长花岗岩形成于与太平洋板块俯冲作用相关的火山弧构造环境。

关键词: 二长花岗岩, 地球化学特征, 成因, 火山弧构造环境

Abstract: The monzonitic granite in Erguying forest farm is located in the northeast area of Lesser Khingan Mountaines,it is the important part of the Yichun-Yanshou magma belt.Based on analyzing the regional geological background,combing with the related test results,the petrogeochemistry characteristics and genesis of the monzonitic granite in Erguying forest farm are discussed in detail.The results show that:①the monzonitic granite with the characteristics of high silica (w(SiO₂) 65.23%~71.20%),alumina (w(Al₂O₃) 13.46%~17.07%) and rick alkali (w(Na₂O+K₂O)6.56%~8.27%),it belongs to the partial aluminum calc-alkalic rock series with high potassium;②the monzonitic granite is enriched in large ion lithophile elements (such as K、Rb、Ba) and incompatible elements with lively chemical properties (such as U, Th), it is relatively depleted in high field strength elements (such as Nb、Sr、Ti) and heavy rare earth elements (such as Y、Yb、Lu ),the petrogeochemistry characteristics of the monzonitic granite is similar to the ones of I type granite;③the monzonitic granite is formed in volcanic arc tectonic environment related to the Pacific plate subduction.

Key words: Monzonitic granite, Petrogeochemistry characteristics, Genesis, Volcanic arc tectonic environment

江峰, 李慧, 张国宾. 黑龙江二股营林场二长花岗岩地球化学特征及成因[J]. 现代矿业, 2016, 32(10): 91-95.

JIANG Feng, LI Hui, ZHANG Guo-Bin. Petrogeochemistry Characteristics and Genesis of the Monzonitic Granite in Erguying Forest Farm in Heilongjiang Province[J]. Modern Mining, 2016, 32(10): 91-95.

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