广西佛子冲铅锌矿床地质特征及找矿前景研究
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摘要
本文在大量的野外地质调查、室内测试分析和资料综合整理的基础上,总结出了佛子冲铅锌矿床的矿体类型、矿物组合、围岩蚀变、成矿期次等基本内容。
通过对区内的黑云母二长花岗岩、花岗斑岩中的锆石进行SHRIMP U-Pb测年得知,黑云母二长花岗岩的年龄为(450±6)Ma、花岗斑岩的年龄为(96.7±1.4)Ma和(95.8±1.2)Ma。结合该地区岩浆岩的稀土和微量元素特征,得出了该区的岩浆岩除黑云母二长花岗岩外,花岗闪长岩、花岗斑岩、英安斑岩是属同期火山岩浆在不同阶段演化的产物。
佛子冲铅锌矿床中的矿体可以分为层状矿体和块状矿体两种。除产于破碎带中的矿体外,大部分层状矿体的稀土配分曲线与该地区的块状矿体、块状绿色岩、岩浆岩基本一致,少量层状矿体的稀土配分曲线显示中等的负铕异常,与部分层状绿色岩的特征相似,显示了成矿过程中地球物理化学条件的差异性。通过对佛子冲矿床中流体包裹体主要为H2O-NaCl盐水溶液,成矿温度为110～190℃和300～400℃,成矿流体具有低盐度低密度的特征。通过对矿床中闪锌矿、方铅矿、黄铜矿的稳定同位素研究得出佛子冲铅锌矿床的δ34S‰值集中分布于0‰附近,在直方图上呈陡立的塔式分布,显示了成矿物质来源的均一性和深源性,具有典型的岩浆硫或海水还原层中硫同位素的特点。矿石铅同位素的模式年龄为136Ma,在铅同位素演化图上的投点多落在造山带铅与上地壳铅曲线附近,且矿石铅样品明显呈线性分布,表明佛子冲矿床的铅的来源比较单一,主要与燕山期岩浆岩关系密切。综上所述,佛子冲铅锌矿床是与燕山期岩浆作用关系密切的高中温热液矿床。
通过对佛子冲铅锌矿田中主要赋矿围岩的矿物成分、结构构造、围岩蚀变、稀土元素特征的研究,得出了赋矿围岩绿色岩的成因,进而总结出了绿色岩的控制条件。结合矿体三维立体图,得出佛子冲铅锌矿床的南部和深部具有较好的找矿前景。
This paper sum up the elements of ore type, mineral composition, rock alteration and mineralization of the times of Fozichong lead-zinc deposits, on the basis of large numbers of field investigation and indoor test analysis and synthesize information.
The zircons of biotite monzogranite and granite porphyry at Fozichong Pb-Zn deposit yield a SHRIMP U-Pb age of (450±6) Ma, (96.7±1.4) Ma and (95.8±1.2) Ma. Combined with the rare earth and trace element characteristics of the igneous rocks in this area, we got that the granidiorite, granite porphyry and dacite porphyry were formed by the magma differentitation of the same magma source and epoch, except the biotite adamellite.
The ore body of Fozichong lead-zinc deposits can be divided into two kinds of layered ore bodies and massive ore bodies. In addition to the ore bodies produced in the fracture zone, the REE of most layered ore bodies are basically the same to the region's massive ore body, massive green rocks, magmatic rocks, A small amount of REE of layered ore body show moderate negative Eu anomaly, with some similar characteristics of layered green rocks, Shows the differences of geophysical and chemical conditions of ore-forming process. The fluid inclusions in Fuzichong Deposit are mainly H2O-NaCl liquid inclusions with low salinity and low density. These inclusions mainly homogenize at temperatures range from 110℃to 190℃or from 340℃to 400℃. Sulfur isotopic investigations of sphalerite, galenite and chalcopyrite demonstrate thatδ34S values of Fuzichong Pb-Zn deposit distribute like a tower clock which are concentrated in the vicinity of 0‰, suggesting a relatively homogeneous and deep material supply. Ore lead isotope model age is 136Ma, most of its dots fall on the Pb isotope evolution map near the orogen curve and the upper crust curve, and Pb isotope of the Pb ore sample was linearly Distribution, indicate the Pb source of Fuzichong ore field relatively simple, mainly closely related with Mesozoic magmatic rocks. To sum up the above arguments, Fozichong Pb-Zn deposit is an epithermal deposit closely related to Yanshanian magmatism.
According to the study on its mineral compositions, textures and structures, wall rock alteration and rare earth elements of the main ore-bearing rocks, we found the genesis of the main ore-bearing rocks, which is green rocks, and then summed up the control conditions of the green rocks. Combined with the three-dimensional map of the orebodies, a good prospects of mineral exploration in deep mine and south of mine field is suggested.
通过对区内的黑云母二长花岗岩、花岗斑岩中的锆石进行SHRIMP U-Pb测年得知,黑云母二长花岗岩的年龄为(450±6)Ma、花岗斑岩的年龄为(96.7±1.4)Ma和(95.8±1.2)Ma。结合该地区岩浆岩的稀土和微量元素特征,得出了该区的岩浆岩除黑云母二长花岗岩外,花岗闪长岩、花岗斑岩、英安斑岩是属同期火山岩浆在不同阶段演化的产物。
佛子冲铅锌矿床中的矿体可以分为层状矿体和块状矿体两种。除产于破碎带中的矿体外,大部分层状矿体的稀土配分曲线与该地区的块状矿体、块状绿色岩、岩浆岩基本一致,少量层状矿体的稀土配分曲线显示中等的负铕异常,与部分层状绿色岩的特征相似,显示了成矿过程中地球物理化学条件的差异性。通过对佛子冲矿床中流体包裹体主要为H2O-NaCl盐水溶液,成矿温度为110～190℃和300～400℃,成矿流体具有低盐度低密度的特征。通过对矿床中闪锌矿、方铅矿、黄铜矿的稳定同位素研究得出佛子冲铅锌矿床的δ34S‰值集中分布于0‰附近,在直方图上呈陡立的塔式分布,显示了成矿物质来源的均一性和深源性,具有典型的岩浆硫或海水还原层中硫同位素的特点。矿石铅同位素的模式年龄为136Ma,在铅同位素演化图上的投点多落在造山带铅与上地壳铅曲线附近,且矿石铅样品明显呈线性分布,表明佛子冲矿床的铅的来源比较单一,主要与燕山期岩浆岩关系密切。综上所述,佛子冲铅锌矿床是与燕山期岩浆作用关系密切的高中温热液矿床。
通过对佛子冲铅锌矿田中主要赋矿围岩的矿物成分、结构构造、围岩蚀变、稀土元素特征的研究,得出了赋矿围岩绿色岩的成因,进而总结出了绿色岩的控制条件。结合矿体三维立体图,得出佛子冲铅锌矿床的南部和深部具有较好的找矿前景。
This paper sum up the elements of ore type, mineral composition, rock alteration and mineralization of the times of Fozichong lead-zinc deposits, on the basis of large numbers of field investigation and indoor test analysis and synthesize information.
The zircons of biotite monzogranite and granite porphyry at Fozichong Pb-Zn deposit yield a SHRIMP U-Pb age of (450±6) Ma, (96.7±1.4) Ma and (95.8±1.2) Ma. Combined with the rare earth and trace element characteristics of the igneous rocks in this area, we got that the granidiorite, granite porphyry and dacite porphyry were formed by the magma differentitation of the same magma source and epoch, except the biotite adamellite.
The ore body of Fozichong lead-zinc deposits can be divided into two kinds of layered ore bodies and massive ore bodies. In addition to the ore bodies produced in the fracture zone, the REE of most layered ore bodies are basically the same to the region's massive ore body, massive green rocks, magmatic rocks, A small amount of REE of layered ore body show moderate negative Eu anomaly, with some similar characteristics of layered green rocks, Shows the differences of geophysical and chemical conditions of ore-forming process. The fluid inclusions in Fuzichong Deposit are mainly H2O-NaCl liquid inclusions with low salinity and low density. These inclusions mainly homogenize at temperatures range from 110℃to 190℃or from 340℃to 400℃. Sulfur isotopic investigations of sphalerite, galenite and chalcopyrite demonstrate thatδ34S values of Fuzichong Pb-Zn deposit distribute like a tower clock which are concentrated in the vicinity of 0‰, suggesting a relatively homogeneous and deep material supply. Ore lead isotope model age is 136Ma, most of its dots fall on the Pb isotope evolution map near the orogen curve and the upper crust curve, and Pb isotope of the Pb ore sample was linearly Distribution, indicate the Pb source of Fuzichong ore field relatively simple, mainly closely related with Mesozoic magmatic rocks. To sum up the above arguments, Fozichong Pb-Zn deposit is an epithermal deposit closely related to Yanshanian magmatism.
According to the study on its mineral compositions, textures and structures, wall rock alteration and rare earth elements of the main ore-bearing rocks, we found the genesis of the main ore-bearing rocks, which is green rocks, and then summed up the control conditions of the green rocks. Combined with the three-dimensional map of the orebodies, a good prospects of mineral exploration in deep mine and south of mine field is suggested.
引文
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[2]雷良奇.广西河三铅锌(银)矿床的成矿物理化学条件[J].桂林工学院学报,1996,7,16(3)272～276；
[3]冯佐海等.佛子冲铅锌矿田火山岩覆盖区构造控矿特征[J],有色金属矿产与勘查,1999,12,8(6)：423～427；
[4]张会琼.佛子冲铅锌矿田构造控矿特征与成矿预测[D],中国地质大学(北京),2007；
[5]杨斌等.广西佛子冲铅锌矿田两种矿石类型及其成因意义[J]'桂林工学院学报,2002,22(2)109～113；
[6]徐海.广西佛子冲地区成矿模式与找矿模式研究[J].有色金属矿产与勘查,1995,12,4(6)341～345；
[7]徐海等.广西佛子冲铅锌矿田地质特征及找矿前景[J].广西地质,1996,9(4)；
[8]雷良奇等.广西佛子冲铅锌(银)成矿带多元素富集特征及矿床成因[J].矿床地质,2002,21(1)：74～82；
[9]雷良奇等.佛子冲火山岩区隐伏铅锌矿床的类型归属及成矿远景.地质与勘探,2002,1,38(1)9～14；
[10]梁锦叶等.佛子冲铅锌矿田火山岩覆盖区接触—断裂带控矿特征[J].桂林工学院学报,2000,20(2)：128～132；
[11]雷良奇等.广西佛子冲火山岩覆盖区孔坡隐伏铅锌矿床定位预测[J].有色金属矿产与勘查,1999,12,8(6)：439～441：
[12]杨斌等.广西佛子冲铅锌矿田成因刍议[J],广西地质,2000,13(1)：21～27；
[13]杨斌等.广西佛子冲铅锌矿田绿色岩特征及成因[J].成都理工学院学报,2001,28(4)：355～359；
[14]杨斌.广西佛子冲铅锌多金属矿田热水沉积—叠生改造成矿与找矿模式[D].成都理工大学,2001；
[15]吴烈善.广西佛子冲铅锌矿田喷流沉积岩地球化学特征[J].矿物岩石地球化学通报,2004,10,23(4)：326～331：
[16]吴烈善等.桂东南佛子冲铅锌矿田成矿预测研究[J].南方国土资源,2004,9：18～20；
[17]广西地勘局204队.佛子冲矿区成矿规律与成矿预测[R].1987.7；
[18]赵晓鸥等.广西三河铅锌矿矿床成因及成矿条件分析[J],广西地质,1990,3(2)：47～56；
[19]张乾.广西河三铅锌矿田同位素和微量元素特征及矿床成因[J].有色金属矿产与勘查,2(4)247～253；
[20]雷良奇.广西河三铅锌(银)矿床成矿规律及成因[J].桂林冶金地质学院学报,1994,1,14(1)：23～30；
[21]雷良奇等.广西佛子冲铅锌(银)矿田岩浆岩的时代及地球化学特征[J].岩石学报,1995,11(1)：77～82；
[22]李玉平.广西佛子冲铅锌矿田含矿围岩稀土元素地球化学特征与矿床成因探讨[J].广西地质,1993,6(4)：53～61；
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