坦桑尼亚恩泽加地区辉长岩地球物理特征及构造意义
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摘要
坦桑尼亚恩泽加地区内的某研究区第四系覆盖严重,常规地质找矿方法无从入手。为了解研究区内地层或岩性边界、构造产出环境,给选择找矿靶区提供指导作用和有效找矿信息,笔者进行了1∶1万地面高精度磁测,圈定了数条NW-SE向和NE-SW向呈线性串珠状展布的磁异常带,依据辉长岩磁性特征,推测磁异常带是由侵入辉长岩岩脉引起,从而厘清了研究区内线性构造的分布特征;结合区域构造和金矿床(点)分布规律,认为研究区内NWSE向剪切带是与金矿矿化关系最为密切的构造,应以寻找构造蚀变岩型或剪切带型金矿为主;经对NW-SE向剪切构造带(SZ6)进行地表工程揭露,发现了金矿化蚀变带。
A research area in Nzega region of Tanzania is covering so severe by fourth system that conventional geological prospecting methods are not available. In order to understand the stratigraphic or lithological boundary of the study area and to construct the production environment,it provides guidance function and effective prospecting information for the selected target area,carries out 1 ∶ 10 000 the ground high-precision magnetic survey,delineate multiple linear magnetic anomaly zone of beaded displays for NW-SE and NE-SW.Based on the magnetic characteristics of gabbro,It is speculated that the magnetic anomaly belt is caused by intrusive gabbro dyke,thus clarifying the distribution characteristics of the linear structure in the study area. Combination of regional structure and distribution of gold deposits( points),that research the shear zone for NW-SE is the most close structure with gold mineralization relationship,to look for tectonic altered rock type and shear zone type gold deposit; After the surface engineering of the shear tectonic belt( SZ6) for NW-SE was revealed,gold mineralized alteration zone was discovered.
A research area in Nzega region of Tanzania is covering so severe by fourth system that conventional geological prospecting methods are not available. In order to understand the stratigraphic or lithological boundary of the study area and to construct the production environment,it provides guidance function and effective prospecting information for the selected target area,carries out 1 ∶ 10 000 the ground high-precision magnetic survey,delineate multiple linear magnetic anomaly zone of beaded displays for NW-SE and NE-SW.Based on the magnetic characteristics of gabbro,It is speculated that the magnetic anomaly belt is caused by intrusive gabbro dyke,thus clarifying the distribution characteristics of the linear structure in the study area. Combination of regional structure and distribution of gold deposits( points),that research the shear zone for NW-SE is the most close structure with gold mineralization relationship,to look for tectonic altered rock type and shear zone type gold deposit; After the surface engineering of the shear tectonic belt( SZ6) for NW-SE was revealed,gold mineralized alteration zone was discovered.
引文
[1]李水平,袁杨森,司建涛,等.坦桑尼亚姆瓦莫拉金矿综合找矿模式[J].中国地质,2016,43(4):1409-1419.
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[11]郭友钊,张振海,张杰,等.北山成矿带黑山铜镍硫化物矿区物性特征及其找矿意义[J].物探与化探,2017,41(4):662-666.
[12]张翔,江民忠,汪远志,等.利用高精度航磁资料研究滁州—六合地区断裂构造[J].物探与化探,2017,41(2):231-241.
[13]蔡文军,冯春圆,倪卫冲,等.伊春地区铅锌多金属矿的航磁异常特征分析与研究[J].物探与化探,2016,40(5):869-875.
[14]王少帅,邓国武,汪冰,等.高精度磁测与激电测深在航磁异常查证中的应用[J].物探与化探,2016,40(5):916-922.
[15]李水平.低磁纬度地区ΔT异常处理解释方法在坦桑尼亚某地区金矿预查中的应用[J].物探与化探,2009,33(6):657-659.
[16]李水平,白德胜,程华,等.坦桑尼亚某金矿的磁力、激电异常特征[J].物探与化探,2012,36(5):737-740.
[17]李水平,王建光,白德胜,等.坦桑尼亚Maheiga金矿地球物理特征及找矿标志[J].地球物理学进展,2014,29(5):2395-2400.
[18]史建民,林泽付,胡鑫.大兴安岭地区航磁异常特征与地质构造、成矿带的关系探讨[J].地球物理学进展,2014,29(1):110-115.
[2]柳建新,孙欢乐,陈波,等.重磁方法在国内外金属矿中的研究进展[J].地球物理学进展,2016,31(2):713-722.
[3]朱丹,刘天佑,杨宇山.鄂东南地区岩体重磁异常场特征及找矿方向[J].物探与化探,2017,41(4):587-593.
[4]杜化宇,李晓禄,杨玉勤.长山壕地区金矿航放航磁特征研究[J].物探与化探,2017,41(3):421-428.
[5]崔志强.高精度航空物探在重要成矿带资源调查中的应用[J].物探与化探,2018,42(1):38-49.
[6]崔玉良,王根厚,梁晓.西藏玛依岗日地区辉长岩地球化学特征及其构造意义[J].现代地质,2017,31(2):258-266.
[7]程华,李水平,邵江波,等.坦桑尼亚Maheiga金矿区航空、地面磁力异常特征与找矿研究[J].黄金科学技术,2015,23(4):24-29.
[8]姜高珍,李以科,王安建,等.坦桑尼亚苏库玛兰德绿岩带金矿地质特征及找矿思路[J].地质与勘探,2015,51(6):1193-1199.
[9]李水平,杨东朝,程华,等.坦桑尼亚条带状含铁建造磁化率参数统计特征及其应用[J].地质与勘探,2013,49(4):784-790.
[10]李水平,王建光,程华,等.钻孔岩芯岩(矿)石磁化率参数特征并用于地层岩性划分[J].物探与化探,2013,37(5):775-778.
[11]郭友钊,张振海,张杰,等.北山成矿带黑山铜镍硫化物矿区物性特征及其找矿意义[J].物探与化探,2017,41(4):662-666.
[12]张翔,江民忠,汪远志,等.利用高精度航磁资料研究滁州—六合地区断裂构造[J].物探与化探,2017,41(2):231-241.
[13]蔡文军,冯春圆,倪卫冲,等.伊春地区铅锌多金属矿的航磁异常特征分析与研究[J].物探与化探,2016,40(5):869-875.
[14]王少帅,邓国武,汪冰,等.高精度磁测与激电测深在航磁异常查证中的应用[J].物探与化探,2016,40(5):916-922.
[15]李水平.低磁纬度地区ΔT异常处理解释方法在坦桑尼亚某地区金矿预查中的应用[J].物探与化探,2009,33(6):657-659.
[16]李水平,白德胜,程华,等.坦桑尼亚某金矿的磁力、激电异常特征[J].物探与化探,2012,36(5):737-740.
[17]李水平,王建光,白德胜,等.坦桑尼亚Maheiga金矿地球物理特征及找矿标志[J].地球物理学进展,2014,29(5):2395-2400.
[18]史建民,林泽付,胡鑫.大兴安岭地区航磁异常特征与地质构造、成矿带的关系探讨[J].地球物理学进展,2014,29(1):110-115.