新疆扎格依库都克金矿地球化学特征及地质意义
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摘要
扎格依库都克金矿位于哈萨克斯坦-准噶尔板块北缘、额尔齐斯构造带南部。围岩蚀变硅化、黄铁矿化、褐铁矿化、绢云母化。矿区原生晕测量成果显示Au,As,Sb,Bi,W等元素与金矿化关系密切,矿床中的金可能是深部岩浆热液活动沿断裂上升,萃取围岩中的成矿物质形成的。赋矿岩石地球化学研究表明,大离子亲石元素K,Ba,Rb等富集,Nb,Ta,Ti等部分高场强元素亏损;轻稀土元素(LREE)相对重稀土元素(HREE)轻度富集,Nb/Ta值为19.63～26.00,显示岩浆可能源于下地壳或上地幔熔融,且有上地壳物质混入,是大陆岛弧至大陆边缘构造环境下的火山活动产物。
Zhageyikuduke gold deposit is located in the Northern margin of Kazaka-Junggar plate and the Southern Erzis tectonic belt.The wall rock alterations are mainly silicification,pyritization,ferritization,sericitization.Primary halo measurement results show that the elements such as Au-As-Sb-Bi-W,which are closely related to gold mineralization.The gold in the deposit may be the deep magmatic hydrothermal activity rising along the fault,extracting ore-forming materials from surrounding rock.The ore-hosting rocks are relatively enriched in large ion lithophile elements(K,Ba,Rb,etc.)and depletion in high field strength elements(Nb,Ta,Ti,etc.).Light rare earth elements(LREE)are lightly enriched,which is relative to heavy rare earth elements(HREE).Nb/Ta ratio(19.63～26.00),which suggest that the magma may originate from the melting of the lower crust or the upper mantle,and the material of the upper crust is mixed into the magma,which is the product of volcanic activity in the continental island arc to continental margin tectonic environment.
Zhageyikuduke gold deposit is located in the Northern margin of Kazaka-Junggar plate and the Southern Erzis tectonic belt.The wall rock alterations are mainly silicification,pyritization,ferritization,sericitization.Primary halo measurement results show that the elements such as Au-As-Sb-Bi-W,which are closely related to gold mineralization.The gold in the deposit may be the deep magmatic hydrothermal activity rising along the fault,extracting ore-forming materials from surrounding rock.The ore-hosting rocks are relatively enriched in large ion lithophile elements(K,Ba,Rb,etc.)and depletion in high field strength elements(Nb,Ta,Ti,etc.).Light rare earth elements(LREE)are lightly enriched,which is relative to heavy rare earth elements(HREE).Nb/Ta ratio(19.63～26.00),which suggest that the magma may originate from the melting of the lower crust or the upper mantle,and the material of the upper crust is mixed into the magma,which is the product of volcanic activity in the continental island arc to continental margin tectonic environment.
引文
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[3]董永观,朱韶华,芮行健,等.新疆萨尔布拉克金矿矿床地球化学及矿床成因[J].火山地质与矿产,1994,(4):21-34.
[4]应立娟,王登红,梁婷,等.新疆乔夏哈拉铁铜金矿的矿床成因及其成矿模式[J].矿床地质,2009,28(2):211-217.
[5]李泰德.新疆富蕴县乔夏哈拉金铜铁矿地质特征及成因分析[J].地质与勘探,2002,38(1):18-21.
[6]吕书君,张志欣,杨富全,等.准噶尔北缘老山口铁铜金矿床成矿流体及成矿机制[J].矿床地质,2012,31(3):517-534.
[7]沈远超,申萍,曾庆栋,等.新疆阿尔泰金矿带主要金矿类型、成矿规律及成矿预测[J].地质与勘探,2004,40(5):1-5.
[8]Sun S.S.,Mcdonough W.F..Chemical and Isotopic Systematics of Oceanic Basalts:Implications for Mantle Composition and Processes[J].Geological Society of London Special Publications,1989,42:313-345.
[9]Taylor S.R.,Mclennan S.M..The continental crust:its composition and evolution[M].1985.
[10]Thompson R.N..British Tertiary volcanic province[J].Scott.J.Geol.,1982,18:59-107.
[11]Bailey J.C..Geochemical criteria for a refined tectonic discrimination of orogenoc andesites[J].Chem.Geol.,1981,32:139-159.
[12]王京彬,徐新.新疆北部后碰撞构造演化与成矿[J].地质学报,2006,80(1):23-31.