本溪地区BIF中玄武质围岩的高场强元素特征

doi:10.12068/j.issn.1005-3026.2016.08.022

东北大学学报:自然科学版 ›› 2016, Vol. 37 ›› Issue (8): 1172-1176.DOI: 10.12068/j.issn.1005-3026.2016.08.022

本溪地区BIF中玄武质围岩的高场强元素特征

韩创益^1,2，王恩德¹，付建飞¹，罗衷热²

(1. 东北大学资源与土木工程学院，辽宁沈阳110819; 2. 金策工业综合大学资源勘探工程学院，平壤999093)

收稿日期:2015-06-29 修回日期:2015-06-29 出版日期:2016-08-15 发布日期:2016-08-12
通讯作者: 韩创益
作者简介:韩创益(1980-)，男，朝鲜人，东北大学博士研究生; 王恩德(1957-)，男，辽宁盖州人，东北大学教授，博士生导师.
基金资助:
国家重点基础研究发展计划项目(2012CB416800)；国家自然科学基金资助项目(41372098)；中央高校基本科研业务费专项资金资助项目(N120401003).

HFSE Characteristics of Basaltic Volcanic Wall Rocks Around BIFs in Benxi Area

HAN Chang-ik^1,2， WANG En-de¹， FU Jian-fei¹， RA Chong-yol²

1. School of Resources & Civil Engineering， Northeastern University， Shenyang 110819， China; 2. College of Geoexploration Engineering， Kimchaek University of Technology， Pyongyang 999093， DPRK.

Received:2015-06-29 Revised:2015-06-29 Online:2016-08-15 Published:2016-08-12
Contact: HAN Chang-ik
About author:-
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摘要/Abstract

摘要： 辽宁本溪地区条带状铁矿(BIF)与其玄武质火山围岩之间的时空关联非常密切.对于玄武质火山围岩高场强元素(HFSE)的研究表明:w_○Nb/w_○Ta比值(7.00~19.93)表现出明显的分异，而w_○Zr/w_○Hf比值(33.46~38.28)则变化不大；从弓长岭到南芬、歪头山样品的w_○Nb/w_○Ta比值变化具有明显的循序性.这种高场强元素的迁移和分异特征反映出俯冲作用与盆地演化之间的关联.研究区玄武质火山围岩(w_○Nb/w_○Yb)_N比值大于1(1.21~18.45，平均2.72)，这进一步表明，其形成的构造背景为陆内弧后盆地提供了有利于BIF形成的条件.

关键词: 本溪地区, BIF, 玄武质火山围岩, 高场强元素, 陆内弧后盆地

Abstract: BIFs have spatial and temporal association with their basaltic volcanic wall rocks in Benxi area of Liaoning Province. Through an analysis on the HFSE (high field-strength element)characteristics of basaltic volcanic wall rocks around BIFs， it was found that their w_○Nb/w_○Ta ratios (7.00~19.93) were remarkably fractionated， but the fractionation of w_○Zr/w_○Hf ratios (33.46~38.28) was not so obvious. In addition， the fractionation of w_○Nb/w_○Ta ratios had regional tendency from Gongchangling to Nanfen and Waitoushan. These migration and fractionation characteristics of HFSE showed a connection between basin evolution and subduction process. Their (w_○Nb/w_○Yb)_N ratios (1.21~18.45， average 2.72) were greater than 1， further suggesting that the tectonic setting for BIFs in the studied area was an intra-continental back arc basin.

Key words: Benxi area, BIF, basaltic volcanic wall rock, HFSE (high field-strength element), intra-continental back arc basin

中图分类号:

P612

韩创益，王恩德，付建飞，罗衷热. 本溪地区BIF中玄武质围岩的高场强元素特征[J]. 东北大学学报:自然科学版, 2016, 37(8): 1172-1176.

HAN Chang-ik， WANG En-de， FU Jian-fei， RA Chong-yol. HFSE Characteristics of Basaltic Volcanic Wall Rocks Around BIFs in Benxi Area[J]. Journal of Northeastern University Natural Science, 2016, 37(8): 1172-1176.

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本溪地区BIF中玄武质围岩的高场强元素特征

HFSE Characteristics of Basaltic Volcanic Wall Rocks Around BIFs in Benxi Area

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