地质科学
     首页 | 过刊浏览 |  本刊介绍 |  编委会 |  投稿指南 |  期刊征订 |  留言板 |  批评建议 |  联系我们 |  English
地质科学  1997, Vol. Issue (1): 103-109    DOI:
论文 最新目录 | 下期目录 | 过刊浏览 | 高级检索  |   
构造置换及其控矿规律——以吉林板石沟铁矿为例
屈奋雄, 张宝华, 刘如琦
冶金工业部天津地质研究院 天津 300061
STRUCTURAL TRANSPOSITION AND ITS CONTROLLING EFFECT ON IRON DEPOSITS: AN EXAMPLE FROM BANSHIGOU IRON DEPOSIT, JILIN PROVINCE, CHINA
Qu Fenxiong, Zhang Baohua, Liu Ruqi
Tianjin Geological Academy, Ministry of Metallurgy, Tianjin 300061
 全文: PDF (350 KB)   HTML( )   输出: BibTeX | EndNote (RIS)      背景资料
摘要 强烈的塑性变形使华北地台东北部太古宙鞍山群中的吉林板石沟铁矿发生强烈的构造置换;造成原始仅有二三层的铁矿褶皱重复,在X(包络线)、Y(枢纽线)方向均被拉断,形成透镜状的复式褶皱勾状体。现有的19个矿组均为这种复式褶皱的转折端,并多呈"Z"型不对称形式。根据以上控矿规律本文提出两个找矿方向,一是包络线方向,另一是枢纽线方向,对1、3矿组具体地做了勘探设计。目前本文的勘探设计已得到勘探验证,新增铁矿储量数千万吨。
服务
把本文推荐给朋友
加入我的书架
加入引用管理器
E-mail Alert
RSS
作者相关文章
屈奋雄
张宝华
刘如琦
关键词构造置换   构造控矿   找矿预测   前寒武纪条带状铁   矿板石沟铁矿   吉林省     
Abstract: Structural transposition is ubiquitous in Precambrian craton. Yet, stratigraphic division and structural study are still based on transposition foliation in many Precambian craton researches. The present work discusses the transposition features and their effects on banded iron formation in Banshigou iron deposit in north-eastern part of North China Craton (NCC). Banshigou iron deposit is a typical Precambrian banded iron formation which is composed mainly of magnetite quartzite, plagioclase amphibolites and granites, and considered to be part of an Archaean green stone belt (Qu et al, 1993). Rigorous structural analysis has proved that the Archaean rock group was subjected to intense plastic deformation (D1) during Late Archaean, which produced a set of penetrative S+F+L structures and replaced most strata of the mining area. S1 is axial planar structure to F1 folds. It was the most obvious planar structure trending E—W with nearly upright dip in the mining area and transposed the preexisting S0 to various degrees. F1 folds commonly exhibit tight to isoclinal form. Competent iron commonly became hook-shaped. L1 is the associated linear structure, such as minor fold axes, boudin lines and mullions. These all belong to B-lineation, showing maximun fabric pattern and representing the fold axis plunge 60° to 266°. In many cases, S1 is the surface form of F1 which usualy exhibit asymmetric "Z" type indicating a structural flow deformation mechanism (Милл EP, 1983) and the transposition pattern is much similar to the pattern proposed by Turner and Weiss (1963). Strain analysis shows very small k-values, indicating a dominated flatten deformation regime. Both X (movement direction) and Y (fold axis direction) have been elongate and X diretion’s elongation is larger than that along Y direction. Detailed large-scale mapping shows that contrast to the original juxtaposed lenses, the ore bodies in each of 19 ore groups are multiple fold hinges. There are only 2 or 3 layers of iron ore originally. They are tightly folded by F1, thickened in hinge areas and finally became hook-shaped folds which can be mechanically mined. Ore bodies in the limb areas between ore groups are usually broken down or attenuated. The deeper extension of the hook-shaped folds is mainly controlled by L1 generally plunging moderately to the west. The strong deformation not only broke the ore bodies in X diretion, it also attenuated or even broke the hook-shaped folds in Y direction leading to the formation of the hook-shaped folds in horizontal sections and boudinaged folds in vertical profiles. Two prospecting directions for each ore group have been proposed based on the structural controlling effects on ore bodies. The first one is enveloping line direction, expected to find the neighbouring hook-shaped folds broken off in X direction. The other is fold axis direction, expected to find the deeper boudinaged folds broken off in Y direction. Exploitation schemes for 1, 3 ore groups have been designed in this papers. Now the exploitation schemes have been conducted and millions of tons of iron ore have been found.
Key wordsStructural transposition   Banded iron formation   Prospecting   Banshigou iron ore   Jilin province   China   
收稿日期: 1996-04-10;
基金资助:危机矿山项目,由吉林板石沟铁矿资助。
引用本文:   
屈奋雄,张宝华,刘如琦. 1997, 构造置换及其控矿规律——以吉林板石沟铁矿为例. 地质科学, (1): 103-109.
Qu Fenxiong,Zhang Baohua,Liu Ruqi. STRUCTURAL TRANSPOSITION AND ITS CONTROLLING EFFECT ON IRON DEPOSITS: AN EXAMPLE FROM BANSHIGOU IRON DEPOSIT, JILIN PROVINCE, CHINA[J]. Chinese Journal of Geology, 1997, (1): 103-109.
 
没有本文参考文献
[1] 刘如琦. 吉南太古宙岩群中的大型构造置换及其对BIF矿体的控制[J]. 地质科学, 2004, (3): 407-415.
[2] 刘亮明, 王志强, 彭省临, 杨群周, 邵拥军. 综合信息论在储量危急矿山深边部找矿中的应用——以铜陵凤凰山铜矿为例[J]. 地质科学, 2002, (4): 444-452.
 
版权所有 © 2009-2017 《地质科学》编辑部
地址:北京9825信箱  邮政编码:100029
电话:010-82998109  010-82998115