新疆富蕴县舍勒高金矿地质地球化学特征及地质意义
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摘要
舍勒高金矿是位于额尔齐斯构造带东部的小型金矿。通过野外观测,将矿床的形成分为石英黄铁矿化、石英绢云母黄铁矿及碳酸盐化3个阶段。通过岩石地球化学研究发现,赋矿岩石大离子亲石元素富集K,Rb等元素,亏损Nb,Ta,Ti等部分高场强元素;轻稀土元素(LREE)较重稀土元素(HREE)富集,Nb/Ta值为16.39～20.50,反映岩浆可能源于下地壳或上地幔的熔融,并有上地壳物质混入,为大陆岛弧至大陆边缘构造环境下的火山活动产物。矿床中金可能是深部岩浆热液沿断裂上升时,萃取围岩中的成矿物质形成的。
Shelegao gold deposit is located in the east of ertix tectonic belt. Metallogenic period of ore deposit is divided into three stages:Quartz pyrite stage,Quartz sericite pyrite stage and Carbonation stage.The ore-hosting rocks are relatively enriched in large ion lithophile elements(K,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(16.39～20.50),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.The gold in the deposit may be the deep magmatic hydrothermal activity rising along the fault,extracting ore-forming materials from surrounding rock.
Shelegao gold deposit is located in the east of ertix tectonic belt. Metallogenic period of ore deposit is divided into three stages:Quartz pyrite stage,Quartz sericite pyrite stage and Carbonation stage.The ore-hosting rocks are relatively enriched in large ion lithophile elements(K,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(16.39～20.50),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.The gold in the deposit may be the deep magmatic hydrothermal activity rising along the fault,extracting ore-forming materials from surrounding rock.
引文
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[2]赵玉社,张彬.新疆富蕴县萨尔布拉克金矿地质特征及找矿标志[J].西北地质,2014,47(2):156-163.
[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,(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,(5):1-5.
[8]闫升好,王义天,张招崇,等.新疆额尔齐斯金矿带的成矿类型、地球动力学背景及资源潜力[J].矿床地质,2006(6):693-704.
[9]王燕海,徐九华,刘泽群,等.额尔齐斯成矿带萨尔布拉克金矿床的构造-成矿流体[J].地学前缘,2011,18(5):55-66.
[10]沈远超,申萍,李光明,等.新疆额尔齐斯金矿带构造控矿规律研究[J].矿床地质,2007(1):33-42.
[11]赵海滨,韦定君,刘雪刚,等.新疆额尔齐斯金矿带典型金矿床特征及成矿预测[J].黄金科学技术,2012,20(5):40-44.
[12]Taylor S.R.,Mclennan S.M..The continental crust:its composition and evolution[M].1985,Oxford:Blackwell.
[13]Thompson R.N..British Tertiary volcanic province[J].Scott.J.Geol.,1982,18,59-107.
[14]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.
[15]Mckenizie D.P..Some remarks on the movement of small melt fractions in the mantle[J].Earth and Planetary Science Letters,1989,95:53-72.
[16]王京彬,徐新.新疆北部后碰撞构造演化与成矿[J].地质学报,1981,(1):23-31.
[17]Bailey J.C..Geochemical criteria for a refined tectonic discrimination of orogenoc andesites[J].Chem.Geol.,1981,32:139-159.