Metallogenic law and metallogenic prediction of Qitianling ore-concentrated area
The Qitianling ore-concentrated region is distinguished by its intricate deep geological framework,encom-passing multi-stage and multi-type magmatic activity and mineralization.It stands as a pivotal base for nonfer-rous and rare metal resources within the central sector of the Nanling metallogenic belt.The regional metallogen-ic types are predominantly characterized by series of middle-low and middle-high temperature mineralization.The polymetallic ore-bearing wall rocks exhibit distinct ore-forming characteristics,and the ore-controlling structures are marked by the interplay of folds and a network of multi-directional faults.Spatially,regional plutons and ores are governed by the influence of deep-seated faults.In terms of magmatic and metallogenic lineage,the area pro-vides a comprehensive record of the multi-stage magmatic and mineralization processes that have unfolded from the Late Indosinian to the Late Yanshanian periods,with complex correlations between the timing and chemical compositions of these events.The later-stage lithofacies generally display a higher degree of evolution.The area has developed a sequence of evolutionary metallogenic associations,which include:Tin polymetallic associations linked to the Late Indosinian Orogenic Extension;tungsten-tin,molybdenum-bismuth-lead,and zinc associations associated with crust-mantle interactions during the Middle to Late Yanshanian;Tungsten-molybdenum-bismuth-lead and zinc associations related to the Middle to Late Yanshanian;and Tin,rare earth elements,and fluorite as-sociations connected to the Late Yanshanian crustal remelting.It is hypothesized that there may be deep channels extending into the mantle within the Qitianling ore-concentrated area,with small rock bodies gradually transition-ing from visible outcrops to concealed,extensive batholiths deeper down.The Qitianling pluton in this region pri-marily intruded from the south to the north and was emplaced within a near"S"shaped expansion zone,formed by left-lateral strike-slip movements.The northern margin,which is also an overlap and"S-shaped"concave area,is favorable for the formation of large-scale mineralization.Considering the concept of"full mineralization with missing prospecting"across various scales,the Qitianling pluton and its surrounding areas are anticipated to yield breakthroughs in specific types such as porphyry,quartz vein,and greisen;in strata ranging from Devonian to Carboniferous to Permian;and in element assemblages including lithium,rare earth elements,and tin.Consequent-ly,based on an analysis of the metallogenic regularities and deep structures within the Qitianling ore-concentrated area,this paper proposes two key prospective areas:① the area outside the Furong tungsten,tin,lead,and silver prospect,and ② the Qitianling pluton-Liaojiawan-Qinghedong tungsten,tin,lead,and zinc prospect area.It pro-vides a theoretical basis for further prospecting.
metallogenic lawdeep structurefull mineralization and missing prospectingmetallogenic pre-dictionQitianling
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