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缅甸佤邦西所村金矿控矿因素与成矿规律研究

2020-08-06刘会嘉*,王庆,韦松佚

国土资源导刊 2020年2期

刘会嘉*,王庆,韦松佚

文章编号:1672-5603(2020)02-01-4

摘 要 西所村金矿位于佤邦温高县东部,为近年勘查发现的矿床,含7个金矿体,Au品位3.64~6.54×10-6,估算(333+334)金资源量3.7t。本文对该区岩金矿床金成矿地质背景,对区内金矿床特征及与金成矿相关的地层、构造、岩浆岩等控矿条件进行了分析研究,总结了该金矿床成矿规律。

关键词 控矿条件;成礦规律;西所村金矿;佤邦

中图分类号:P618.51 文献标识码:A

Ore Controlling Factors and Metallogenic Regularity of Xishuocun Gold Deposits Wa State Myanmar

Liu Huijia , Wang Qing , Wei Songyi

(Hunan Institute of Geophysical and Geochemical Exploration,Changsha Hunan  410116)

Abstract: The Xisuocun gold deposits is located in the east of Wengao County, Wa State. It was discovered 5 years ago.It is composed of 7gold ore bodies, and the gold grade changes between 3.64~6.54×10-6,the gold resources are 3.7t(333+334).This paper introduces the geological background of gold mineralization in the area, summary and classification of the characteristics of gold deposits in the area. The ore controlling conditions related to gold mineralization, such as strata, structures and magmatic rock, are analyzed and studied. At the same time, the metallogenic characteristics of gold deposits are discussed and summarized.

Keywords: ore control conditions; metallogenic regularity; Xisuocun gold deposits;Wa State

1 成矿地质背景

缅甸佤邦西所村金矿区位于温高县东部,属青藏西印支板块的一个部分,地处掸泰马板块的北部,东面与中国南方-东印支板块搭界。西面与印度板块拼合;掸泰马板块经历了漫长的长距离的一系列重大地质事件,包含长期的漂移、碰撞、缝合、俯冲,以及再分开、再缝合等,形成现在的印支板块独特的构造形态。历经四次板块大构造运动和发展,使掸泰马板块及其邻近地块形成独特的构造单元、沉积建造、岩浆活动和变质特征, 同时伴生丰富和颇具特色的矿产资源。

2 矿床特征

2.1 矿体赋存状态

该金矿床类型为为破碎带蚀变岩型,矿体严格受断裂构造的控制。矿体主要赋存在断裂破碎带的硅化蚀变岩中,硅化破碎带大体呈近南北向分布,局部向西倾斜,矿体主要产于硅化破碎带,其次为其两盘的绢英岩化千枚岩中, 偶见含金、黄铁矿石英细脉与硅化破碎带呈40-60°夹角穿插在围岩里, 但一般无工业价值。

2.2 矿体特征

矿体产于一组近南北向的硅化蚀变破碎带中,分别在Ⅰ、Ⅱ、Ⅲ、Ⅳ、Ⅴ号5条……

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