川西南大梁子铅锌矿床构造分级控矿规律与控矿构造组合样式

Structural graded ore-controlling rule and ore-controlling structural combination pattern of Daliangzi lead-zinc deposit in southwestern Sichuan

大梁子铅锌矿床位于扬子地块西南缘的川西南矿集区内,矿体展布明显受构造控制。针对该矿床构造分级控矿规律与控矿构造组合样式不清的问题,基于矿田地质力学理论与方法,通过不同级别的典型控矿构造力学性质鉴定及不同期次构造筛分,厘清了控矿构造组合样式及其形成机理。研究表明,成矿构造体系为印支晚期NE向构造带,在NW-SE向主压应力作用下,矿床内形成的不同级别构造分级控制了矿床、矿体和矿脉的展布;形成不同尺度的控矿构造组合样式:矿床尺度的走滑为主断裂-褶皱构造组合、矿体尺度的为“多”字型、“入”字型及“黑色破碎带”构造组合。本研究为该矿床深部及外围找矿勘查提供了重要依据。

The Daliangzi lead-zinc deposit is located in the southwestern Sichuan ore concentration area in the southwestern margin of the Yangtze block, and the ore body′s occurrence obviously controlled by the structure.Aiming at the problem of unclear ore-controlling rules and combinations of ore-controlling structures, based on the theory and method of ore field geomechanics, through the identification of the mechanical properties of typical ore-controlling structures at different levels and the structural screening of different stages, the ore-controlling structures, assemblages and their formation mechanisms were clarified. The research shows that the metallogenic structural system is the late Indosinian NE structural belt.Under the NW-SE principal compressive stress, the resulting structures of different scales control the occurrence of the ore deposit, ore body and ore vein;At the same time, form various structural assemblages: strike-slip at the deposit scale is dominated by fault-fold tectonic assemblages, and orebody-scale assemblages are “multi-shaped”, “in-shaped” and “black fractured zone” structural assemblages.This study provides an important basis for prospecting and exploration in the deep and peripheral parts of the deposit.