粤东北仁差盆地察甘火山岩型铀-多金属矿床成矿特征及其成矿机理探讨
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摘要
察甘矿床是粤东北地区仁差火山岩盆地中已查明的火山岩型铀-多金属矿床,其矿化以铀、钼、金、银为主。通过对矿床成矿特征的分析,将成矿分为3个主要阶段。深部矿体受隐伏断裂破碎带控制,为岩浆热液型矿床,与壳内重熔岩浆有关,包括两个成矿阶段,即白垩世晚期形成金、银、钼等硫化物矿床,古近纪形成铀矿床,两者在同一空间紧密共生;浅部矿体受层间裂隙控制,与表生作用有关,在古近纪晚期之后形成铀钼沉积型矿床。
Chagan deposit is an uranium-polymetal deposit ascertained in Rencha Volcanic Basin in northeast Guangdong,which's mineralization is mainly of uranium,molybdenum,gold,silver.Based on the analysis of the metallogenic characteristics of the deposit,the mineralization is divided into three main stages.The deep orebodies are controlled by the concealed fault zone and belong to magmatic hydrothermal type deposit related to the activity of magma caused by intracrustal partial-melting,which were formed in two mineralization stages:the formation of gold,silver,molybdenum and other sulfide deposits in the Late Cretaceous,and the formation of uranium deposits in the Paleogene,both closely associated in the same space.The shallow orebodies,which belong to sedimentary deposit type of uranium and molybdenum,are controlled by the inter-layer fractures and related to supergenesis,were formed after the Late Paleogene.
Chagan deposit is an uranium-polymetal deposit ascertained in Rencha Volcanic Basin in northeast Guangdong,which's mineralization is mainly of uranium,molybdenum,gold,silver.Based on the analysis of the metallogenic characteristics of the deposit,the mineralization is divided into three main stages.The deep orebodies are controlled by the concealed fault zone and belong to magmatic hydrothermal type deposit related to the activity of magma caused by intracrustal partial-melting,which were formed in two mineralization stages:the formation of gold,silver,molybdenum and other sulfide deposits in the Late Cretaceous,and the formation of uranium deposits in the Paleogene,both closely associated in the same space.The shallow orebodies,which belong to sedimentary deposit type of uranium and molybdenum,are controlled by the inter-layer fractures and related to supergenesis,were formed after the Late Paleogene.
引文
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[2]刘延勇,卢映新,梁业武,等.仁差火山盆地多金属成矿条件分析[J].桂林工学院学报,2007,27(4):469-473.
[3]陈国能.成矿元素的离子结构及其在花岗岩成矿过程中的行为[J].地学前缘,2011,18(1):89-94.
[4]汤谨晖,娄峰,甘炳艳,等.粤东北仁差盆地早侏罗世花岗岩基底LA-ICP-MS锆石U-Pb年龄及其地质意义[J].地质通报,2016,35(6):989-997.
[5]黎彤,饶纪龙.中国岩浆岩的平均化学成分[J].地质学报,1963,43(3):1-60.
[6]刘延勇,卢映新,梁业武,等.粤东北仁差盆地火山岩基本特征[J].桂林工学院学报,2007,27(2):159-164.
[7]MIDDLEMOST E A K.Naming materials in the magma/igneous rock system[J].Earth-Science Reviews,1994,37(3):215-224.
[8]PEARCE J A,HARRIS N B W,TINDLE A G.Trace element discrimination diagrarns for the tectonic interpretation of granitic rocks[J].Joumal of Petrology,1984,25(4):956-983.
[9]DUPUY C,DOSTAL J.Trace element geochemistry of some continental tholeiites[J].Earth Planet Sci.Lett,1984,67(1):61-69.
[10]王玉生,李文君.华南东部中新生代火山岩型铀矿成矿规律,勘查模式及找矿远景[J].铀矿地质,1995,11(3):140-146.
[11]陈国能,邱惟,卢映新,等.陆壳多次重熔与火山岩型铀-多金属矿田的形成[J].地学前缘,2015,22(4):22-28.
[12]CHEN G N,GRAPES R.Granite genesis:in–situ melting and crustal evolution[M].Dordrecht,Netherland:Springer,2007.