LOCATING OF CONCEALED SKARN IRON ORE DEPOSIT BASED ON MULTIVARIATE INFORMATION CONSTRAINTS: A CASE STUDY OF BEIYA GOLD MINE IN YUNNAN PROVINCE

IF 1.6 4区地球科学 Q3 GEOCHEMISTRY & GEOPHYSICS

地球物理学报 Pub Date : 2017-01-01 DOI:10.1002/CJG2.30029

Wang Qiao, Wang Xu-ben, Yang Jian, Minseok Gang, Guo Jing

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引用次数: 3

Abstract

Skarn deposit is one of the main gold-polymetallic deposits in Beiya, Yunnan, and constrained by its porphyries, structures and stratums, the favorable ore-prospecting spaces are contact zones between intermediateacid rocks and carbonatite. Based on the physical characteristics of rocks, we realized the transition between target geological body and the geophysical field and extracted the useful information. Skarn iron deposits are characterized by low-medium resistivity in contact zone, low density of porphyries, high susceptibility and high polarizability of the iron ore. Utilizing the geological and geophysical information, we analyzed ore-controlling factors in different stages, implemented the locating of concealed skarn iron deposits, established a geophysical exploration mode, verified the validity of the study method on the periphery of the ore district and obtained favorable exploration results. We also proposed a locating and predicting method for the concealed skarn iron deposits, which is applicable to Beiya and other similar ore-forming geological conditions.

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基于多元信息约束的隐伏矽卡岩型铁矿床定位——以云南北崖金矿为例

夕卡岩矿床是云南北崖地区主要的金多金属矿床之一，受斑岩、构造和地层的制约，中酸性岩与碳酸盐岩的接触带是有利的找矿空间。根据岩石的物理特征，实现了目标地质体与地球物理场之间的转换，提取出有用的信息。矽卡岩铁矿具有接触带低中电阻率、斑岩密度低、铁矿高磁化率和高极化率的特点。利用地质和地球物理资料，分析了不同阶段控矿因素，实现了隐伏矽卡岩铁矿的定位，建立了地球物理找矿模式。在矿区外围验证了研究方法的有效性，取得了良好的找矿效果。提出了隐伏矽卡岩型铁矿的定位预测方法，适用于北崖及其他类似成矿地质条件。

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