黑龙江省穆棱县砍椽沟金矿床地质、地球化学特征及成因
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摘要
砍椽沟金矿床位于佳木斯地块内,是佳木斯—牡丹江成矿带内发现的一个重要金矿床。矿体呈层状、似层状产出于大理岩、糜棱岩化花岗岩内,形态、产状受北东向构造控制。岩石地球化学分析结果表明,与成矿密切相关的糜棱岩化花岗岩具有高硅、高钾、富碱、贫镁、贫铝、贫钙特征,富集Rb、Th等大离子亲石元素,贫Nb、Ta、Ba等高场强元素,具有明显的Eu负异常,应属于A型花岗岩;Ta与Nb同时表现出明显的亏损,反应其岩浆可能来自于地幔。根据矿体特征、矿石特征、成矿岩体地球化学特征等信息,认为该矿床类型为热液交代型金矿床,且形成于与板块俯冲相关的构造环境中。后期韧性剪切作用使金矿化发生了活化与富集,对金矿体进一步形成具有一定的控制作用。
Kanchuangou Gold Deposit is located in Jiamusi Block and is an important gold deposit in Jiamusi-Mudanjiang metallogenic belt. The gold ore body is in stratiform-like and vein form and occurs in griotte and mylonitize granite. The morphology and occurrence are controlled by NE-trending structure. The litho-geochemical analysis results show that the mylonitized granite closely related to mineralization has high Si and K,rich alkali and low Mg,Ca and Al,and enriches LILE such as Rb and Th,lacks HFS elements such as Nb,Ta and Ba,and is evidently negative Eu anomaly,showing that mylonitized granite belongs to A type granite. Ta and Nb simultaneously exhibit obvious loss,showing the ore-forming magma probably derives from the mantle. According to ore body characteristics,ore features and ore-forming rock geochemical characteristics,it is concluded that the deposit is hydrothermal fluid metasomatic gold deposit formed in the tectonic environment concerning plate subduction. Au mineralization generates further activation and concentration through late ductile shearing,which has certain control of further ore body forming.
Kanchuangou Gold Deposit is located in Jiamusi Block and is an important gold deposit in Jiamusi-Mudanjiang metallogenic belt. The gold ore body is in stratiform-like and vein form and occurs in griotte and mylonitize granite. The morphology and occurrence are controlled by NE-trending structure. The litho-geochemical analysis results show that the mylonitized granite closely related to mineralization has high Si and K,rich alkali and low Mg,Ca and Al,and enriches LILE such as Rb and Th,lacks HFS elements such as Nb,Ta and Ba,and is evidently negative Eu anomaly,showing that mylonitized granite belongs to A type granite. Ta and Nb simultaneously exhibit obvious loss,showing the ore-forming magma probably derives from the mantle. According to ore body characteristics,ore features and ore-forming rock geochemical characteristics,it is concluded that the deposit is hydrothermal fluid metasomatic gold deposit formed in the tectonic environment concerning plate subduction. Au mineralization generates further activation and concentration through late ductile shearing,which has certain control of further ore body forming.
引文
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[8]孙德有,吴福元,高山,等.吉林中部晚三叠世和早侏罗世两期铝质A型花岗岩的厘定及对吉黑东部构造格局的制约[J].地学前缘,2005,12(2):263-275.
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[2]薛明轩.黑龙江省内生金矿成矿作用研究[D].长春:吉林大学,2012.
[3]鲍正德,王文明.黑龙江省牡丹江岩金矿床找矿标志[J].矿物学报,2013,33(增刊2):737-738.
[4]唐铭君,杨言辰,杨兆武,等.黑龙江省英城子金矿床:后韧性剪切型金矿床[J].黄金,2011,32(7):19-25.
[5]刘福,邓翔云,王岳,等.黑龙江省老柞山金矿床地质特征及找矿方向[J].黄金,1996,17(8):11-14.
[6]黑龙江省第四地质勘察院.黑龙江省穆棱市砍椽沟金矿区储量核查报告[R].哈尔滨:黑龙江省第四地质勘察院,2010.
[7]张旗,冉皞,李承东.A型花岗岩的实质是什么?[J].岩石矿物学杂志,2012,31(4):621-626.
[8]孙德有,吴福元,高山,等.吉林中部晚三叠世和早侏罗世两期铝质A型花岗岩的厘定及对吉黑东部构造格局的制约[J].地学前缘,2005,12(2):263-275.
[9]贾小辉,王强,唐功建.A型花岗岩的研究进展及意义[J].大地构造与成矿学,2009,33(3):465-480.
[10]吴锁平,王梅英,戚开静.A型花岗岩研究现状及其述评[J].岩石矿物学杂志,2007,26(1):57-66.