滇西北北衙斑巖型金多金屬礦田構(gòu)造體系及其控礦作用
發(fā)布時間:2018-10-08 09:35
【摘要】:北衙斑巖型金多金屬礦床是西南"三江"多金屬成礦帶新生代斑巖型礦床的典型代表,是滇西北新生代構(gòu)造-巖漿-成礦事件的產(chǎn)物。北衙金多金屬礦田構(gòu)造發(fā)育,構(gòu)成一套褶皺-斷裂-節(jié)理控巖控礦構(gòu)造系統(tǒng),控制和形成了"五位一體"礦床類型組成兩大成礦系統(tǒng):Ⅰ斑巖成礦系統(tǒng),(1)受斑巖體內(nèi)斷裂、節(jié)理裂隙及爆破角礫巖筒控制的斑巖型Cu-Au-(Fe)礦床,(2)受斑巖與圍巖接觸帶構(gòu)造控制的夕卡巖型Au-Fe-(Cu)礦床,(3)受圍巖層間斷裂破碎帶、斷裂、節(jié)理裂隙控制的熱液脈型Au-Fe礦床,(4)沿北衙組灰?guī)r與青天堡組砂泥巖界面及北衙組層間斷裂破碎帶產(chǎn)出的中低溫?zé)嵋盒蚉b多金屬礦床;Ⅱ氧化淋濾成礦系統(tǒng),(5)受巖溶洞穴和不整合面控制的氧化淋濾富集型Au礦床。通過構(gòu)造形跡的幾何學(xué)、運(yùn)動學(xué)分析和力學(xué)性質(zhì)鑒定,筆者認(rèn)為該礦田自燕山晚期—喜馬拉雅早期印度-歐亞板塊碰撞以來主要經(jīng)歷了四期構(gòu)造活動,其主壓應(yīng)力分別經(jīng)歷了近EW向→近SN向→NW向→近EW向的轉(zhuǎn)變過程,依次形成了南北構(gòu)造帶、東西構(gòu)造帶和北東構(gòu)造帶,分別歸屬于三江—滇中經(jīng)向構(gòu)造體系金沙江—程海南北構(gòu)造帶、云南緯向構(gòu)造體系湯丹—鶴慶—蘭坪東西構(gòu)造帶和麗江北東構(gòu)造帶。筆者認(rèn)為,早南北構(gòu)造帶構(gòu)成礦田控巖控礦構(gòu)造格架,東西構(gòu)造帶是控制與喜馬拉雅中期富堿斑巖有關(guān)的斑巖成礦系統(tǒng)的主導(dǎo)性構(gòu)造體系,晚南北構(gòu)造帶既對先前形成的金多金屬礦體產(chǎn)生破壞或(和)改造富集,又是控制喜馬拉雅晚期氧化淋濾成礦系統(tǒng)的主導(dǎo)性構(gòu)造體系。
[Abstract]:The Beiya porphyry type gold polymetallic deposit is a typical representative of the Cenozoic porphyry type deposit in the "Sanjiang" polymetallic metallogenic belt in southwest China, and is the product of the Cenozoic tectonic-magmatic metallogenic events in Northwest Yunnan. The structure of Beiya gold polymetallic ore field is developed, forming a set of fold, fault-joint-controlled rock and ore-controlling structure system, controlling and forming "five-in-one" deposit types, forming two ore-forming systems: 鈪,
本文編號:2256289
[Abstract]:The Beiya porphyry type gold polymetallic deposit is a typical representative of the Cenozoic porphyry type deposit in the "Sanjiang" polymetallic metallogenic belt in southwest China, and is the product of the Cenozoic tectonic-magmatic metallogenic events in Northwest Yunnan. The structure of Beiya gold polymetallic ore field is developed, forming a set of fold, fault-joint-controlled rock and ore-controlling structure system, controlling and forming "five-in-one" deposit types, forming two ore-forming systems: 鈪,
本文編號:2256289
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