滇西镇康放羊山Pb-Zn-Cu多金属矿床地质特征及成因初探
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摘要
放羊山Pb-Zn-Cu多金属矿床位于滇西保山地块南段,镇康复背斜南倾伏端芦子园矿集区内,是该矿集区近年来首个发现的以富铜为特征的铅锌多金属矿床。本文以放羊山矿床为研究对象,从放羊山矿区地层、构造、岩浆岩等矿区地质特征入手,详细研究了放羊山矿床矿体的产出分布、矿石组构及围岩蚀变等矿床地质特征,并将该矿床的成矿作用过程划分为热液期、叠加改造期和表生期。综合区域地质背景及矿床地质特征分析认为该矿床的形成受地层、岩性、构造和隐伏岩浆岩共同制约,为印支—燕山期强烈的挤压碰撞,地层强烈弯曲变形的构造背景下,深部隐伏岩浆出溶,含矿流体沿弯滑褶皱作用所引发的有利部位(如泥岩与灰岩的分界面等产生强烈的破碎变形部位)萃取、运移、汇聚并卸载成矿。属中温热液Pb-Zn-Cu多金属矿床,并被后期构造运动叠加改造。
The Fangyangshan Pb-Zn-Cu polymetallic deposit is located in the south section of the Baoshan massif in the western Yunnan,and it is in the Luziyuan ore-concentration area of the southern tilting of Zhenkang anticlinorium.It is the first copper-rich lead-zinc polymetallic deposit discovered in recent years.In this paper,the Fangyangshan deposit was taken as the research object,starting from the geological characteristics of the strata,structures and magmatic rocks in Fangyangshang deposit,then he geological characteristics in ore body distribution and output characteristics,ore fabric characteristics,wall rock alteration were studied in detail and the metallogenic process into hydrothermal period,superimposed transformation period and epigenetic period were divided.Based on the analysis of the regional geological background and the geological characteristics of the deposit,it was concluded that the formation of the deposit was controlled by strata,lithology,tectonics and concealed magmatic rocks.Under the tectonic background of strong collision and strong bending deformation of strata in Indosinian—Yanshanian period,the deep concealed magma dissolved and ore-bearing fluid extracted,transported,converged and unloaded along the favorable sites(For example,the interface between mudstone and limestone that produces strong crushing and deforming parts.)caused by the flexural-slip fold.It belonged to the mesothermal hydrothermal Pb-Zn-Cu polymetallic deposit and was superimposed by late tectonic movement.
The Fangyangshan Pb-Zn-Cu polymetallic deposit is located in the south section of the Baoshan massif in the western Yunnan,and it is in the Luziyuan ore-concentration area of the southern tilting of Zhenkang anticlinorium.It is the first copper-rich lead-zinc polymetallic deposit discovered in recent years.In this paper,the Fangyangshan deposit was taken as the research object,starting from the geological characteristics of the strata,structures and magmatic rocks in Fangyangshang deposit,then he geological characteristics in ore body distribution and output characteristics,ore fabric characteristics,wall rock alteration were studied in detail and the metallogenic process into hydrothermal period,superimposed transformation period and epigenetic period were divided.Based on the analysis of the regional geological background and the geological characteristics of the deposit,it was concluded that the formation of the deposit was controlled by strata,lithology,tectonics and concealed magmatic rocks.Under the tectonic background of strong collision and strong bending deformation of strata in Indosinian—Yanshanian period,the deep concealed magma dissolved and ore-bearing fluid extracted,transported,converged and unloaded along the favorable sites(For example,the interface between mudstone and limestone that produces strong crushing and deforming parts.)caused by the flexural-slip fold.It belonged to the mesothermal hydrothermal Pb-Zn-Cu polymetallic deposit and was superimposed by late tectonic movement.
引文
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[3] HOU Z Q,YANG Z S,MENG Y F,et al.Geological fluid mapping in the tong ling area:Implications for the paleozoic submarine hydrothermal system in the middle-lower Yangtze Metallogenic Belt,East China[J].Acta Geologica Sinica(English Edition),2007,81(5):833-860.
[4]李文昌,莫宣学.西南“三江”地区新生代构造及其成矿作用[J].云南地质,2001,20(4):333-346.
[5]朱华平,范文玉,高大发,等.西南三江成矿带中南段铅锌矿床成矿系列[J].沉积与特提斯地质,2008,28(4):62-67.
[6]邓军,侯增谦,莫宣学,等.三江特提斯复合造山与成矿作用[J].矿床地质,2010,29(1):37-42.
[7]李兴振,尹福光.东昆仑与西昆仑地质构造对比研究之刍议[J].地质通报,2002,21(11):777-783.
[8]聂飞,董国臣,朱华平.云南西邑铅锌矿床主要矿物学特征[J].矿物学报,2013,33(增刊2):166-167.
[9]叶霖,杨玉龙,鲍谈.云南保山地块核桃坪与芦子园铅锌成矿作用初探[J].矿物学报,2011,31(增刊1):659.
[10]李龚健.三江特提斯复合造山带构造演化与典型矿床成矿过程研究[D].北京:中国地质大学(北京),2014:1-191.
[11]邓必方.保山-镇康地区汞、铅锌矿床的成矿模式[J].云南地质,1995,14(4):355-364.
[12]夏庆霖,陈永清,卢映祥,等.云南芦子园铅锌矿床地球化学、流体包裹体及稳定同位素特征[J].地球科学,2005,30(2):177-186.
[13]黄琴辉.香格里拉陆家村银金多金属矿矿化特征及找矿标志[J].云南地质,2010,29(4):499-502.
[14]董文伟.保山镇康地块成矿条件及典型矿床成矿模式[J].云南地质,2007,26(1):56-61.
[15]蒋成兴,卢映祥,陈永清,等.滇西南芦子园超大型铅锌多金属矿床成矿模式与综合找矿模型[J].地质通报,2013,32(11):1832-1844.
[16]庄忠海.全国古地磁学岩石磁学和环境磁学应用研讨会[J].地球物理学进展,1993,8(4):125-199,205.