西藏帮浦东段——笛给铅锌多金属矿床激电异常特征及找矿方向
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摘要
冈底斯成矿带东段矿产资源丰富,矿床类型复杂,前人大多以帮浦、甲马、驱龙等重要矿床作为主要研究对象,对帮浦东段—笛给铅锌矿区研究较少,特别是地球物理方面鲜有研究。以帮浦东段—笛给铅锌矿区地球物理激电异常作为主要研究对象,物性参数测定结果显示铅锌矿体具有中高视极化率特征,而黄铁矿化视极化率为区内最高,认为低阻中高极化区域才是区内找矿的重点部位;激电异常指示了帮浦东段F1、F2含矿断裂具有往东延展特性,帮浦东段—笛给铅锌矿区结合部位存在含矿角砾岩筒,推断深部存在含矿岩体;笛给矿区古近系古新统典中组属于高硫型盖层,其下具有寻找矽卡岩铅锌矿的良好地质条件;新认识了两区找矿模型,应为斑岩-矽卡岩-中低温热液型铅锌多金属矿床。
The eastern section of Gangdese metallogenic belt is rich in mineral resources and it has complex types of deposits.Previous works mainly focus on important deposits such as Bangpu,Jiama and Qulong.However,a little research has been done on eastern Bangpu-Digei Pb-Zn mining area and even less on the geophysics conditions of this area.In this paper,characteristics of geophysical induced polarization(IP)anomalies of eastern Bangpu-Digei Pb-Zn mining area were taken as the main object of study.The results of physical property parameter determination indicated that Pb-Zn orebodies were characterized by mediumhigh apparent polarizability.The authors believed that regions with low resistivity and medium-high polarizability were targets of prospecting since the apparent polarizability of pyritization was the highest in the area.The IP anomalies indicated that ore bearing fracture F1 and F2 in eastern Bangpu extended to the east,and ore-bearing breccia pipe occurred at the junction part of eastern Bangpu and Digei Pb-Zn mining area.Thus the ore-bearing rock bodies were hypothesized to exist at depth.Palaeocene Dianzhong Formation of Paleogene system in Digei mining area was high sulfur overlying stratum,under which the geological conditions were favorable to prospecting of skarn type Pb-Zn deposits.The prospecting model of these two areas was re-recognized and determined as porphyry-skarn type medium-low temperature hydrothermal Pb-Zn polymetallic deposits.
The eastern section of Gangdese metallogenic belt is rich in mineral resources and it has complex types of deposits.Previous works mainly focus on important deposits such as Bangpu,Jiama and Qulong.However,a little research has been done on eastern Bangpu-Digei Pb-Zn mining area and even less on the geophysics conditions of this area.In this paper,characteristics of geophysical induced polarization(IP)anomalies of eastern Bangpu-Digei Pb-Zn mining area were taken as the main object of study.The results of physical property parameter determination indicated that Pb-Zn orebodies were characterized by mediumhigh apparent polarizability.The authors believed that regions with low resistivity and medium-high polarizability were targets of prospecting since the apparent polarizability of pyritization was the highest in the area.The IP anomalies indicated that ore bearing fracture F1 and F2 in eastern Bangpu extended to the east,and ore-bearing breccia pipe occurred at the junction part of eastern Bangpu and Digei Pb-Zn mining area.Thus the ore-bearing rock bodies were hypothesized to exist at depth.Palaeocene Dianzhong Formation of Paleogene system in Digei mining area was high sulfur overlying stratum,under which the geological conditions were favorable to prospecting of skarn type Pb-Zn deposits.The prospecting model of these two areas was re-recognized and determined as porphyry-skarn type medium-low temperature hydrothermal Pb-Zn polymetallic deposits.
引文
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[13]付强,杨竹森,郑远川,等.西藏龙马拉Cu-Fe-Pb-Zn多金属矿床金云母Ar-Ar定年及其地球动力学意义[J].岩石矿物学杂志,2014,33(2):283-293.
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[15]杨毅,多吉,刘鸿飞,等.西藏列廷冈铁多金属矿床辉钼矿Re-Os定年及其地质意义[J].中国地质,2014,41(5):1181-1191.
[16]张林奎,范文玉,高大发.西藏勒青拉铁铅锌矿床成矿模式[J].地球学报,2012,33(4):673-680.
[17]LANG Xinghai,TANG Juxing,LI Zjijun,et al.U-Pb and ReOs geochronological evidence for the Jurassic porphyry metallogenic event of the Xiongcun district in the Gangdese porphyry copper belt,southern Tibet,PRC[J].Journal of Asian Earth Sciences,2014,79(2):608-622.
[18]ZHAO Junxing,QIN Kezhang,LI Guangming,et al.Collision-related genesis of the Sharang porphyry molybdenum deposit,Tibet:Evidence from zircon U-Pb ages,Re-Os ages and Lu-Hf isotopes[J].Ore Geology Reviews,2014,56:312-326.
[19]孙广沅,莫江平,郝以顺,等.西藏达龙钨钼多金属矿床矿化分带特征[J].矿产与地质,2017,31(1):46-52.
[20]张晓东,方捷,张定源,等.激发极化法在东溪金矿接替资源勘查中的应用[J].物探与化探,2017,41(3):445-451.
[21]王富春,李玉龙,鲁海峰,等.青南纳日贡玛斑岩型铜钼矿床物化探异常特征及找矿模型[J].物探与化探,2016,40(6):1055-1062.
[22]王宏宇,李涛.双频激电法在西澳矿产勘查中的应用[J].物探与化探,2016,40(5):923-928.
[23]周云海,王备战,樊金生,等.物探方法在谢坑矽卡岩型金铜矿勘查中的应用效果[J].矿产与地质,2006,20(4/5):548-551.
[24]周多.激发极化法在辽宁本溪某矽卡岩型铜多金属矿勘查中的应用[J].地质与勘探,2016,52(4):688-694.
[25]孙仁斌.时间域激发极化法在内蒙古镶黄旗某锌钨多金属矿的应用[J].地质与勘探,2017,53(3):519-527.
[2]徐志刚,陈毓川,王登红,等.中国成矿区带划分方案:附图(中国三级成矿区带图)[M].北京:地质出版社,2008.
[3]唐菊兴,王立强,郑文宝,等.冈底斯成矿带东段矿床成矿规律及找矿预测[J].地质学报,2014,88(12):2545-2554.
[4]白荣龙,王乾,钟康惠,等.西藏帮浦斑岩-矽卡岩型铜钼铅锌矿床地质特征分析[J].有色金属工程,2015,5(6):69-73.
[5]马平,郑有业.西藏冈底斯东段帮浦铜多金属矿床成矿流体特征[J].华南地质与矿产,2014,30(1):7-15.
[6]周仕伟,郝江波,夏廷高,等.帮浦矿区东段铅锌矿床地质特征及找矿方向[J].四川地质学报,2016,36(4):598-601.
[7]郎兴海,唐菊兴,杨宗耀,等.西藏自治区谢通门县斯弄多铅锌矿区地球物理特征及找矿方向[J].地质与勘探,2017,53(3):508-518.
[8]唐菊兴,陈毓川,王登红,等.西藏工布江达县沙让斑岩钼矿床辉钼矿铼-锇同位素年龄及其地质意义[J].地质学报,2009,83(5):698-704.
[9]唐菊兴,多吉,刘鸿飞,等.冈底斯成矿带东段矿床成矿系列及找矿突破的关键问题研究[J].地球学报,2012,33(4):393-410.
[10]郎兴海,陈毓川,唐菊兴,等.西藏谢通门县雄村斑岩型铜金矿床成因讨论:来自元素的空间分布特征的证据[J].地质论评,2010,56(3):384-402.
[11]高一鸣,陈毓川,唐菊兴,等.西藏工布江达地区亚贵拉铅锌钼矿床辉钼矿Re-Os测年及其地质意义[J].地质通报,2011,30(7):1027-1036.
[12]费光春,温春齐,周雄,等.西藏洞中拉铅锌矿床石英激光探针40Ar-39 Ar定年及地质意义[J].矿物岩石,2010,30(3):38-43.
[13]付强,杨竹森,郑远川,等.西藏龙马拉Cu-Fe-Pb-Zn多金属矿床金云母Ar-Ar定年及其地球动力学意义[J].岩石矿物学杂志,2014,33(2):283-293.
[14]唐菊兴,黄勇,李志军,等.西藏冈谢通门县雄村铜金矿床元素地球化学特征[J].矿床地质,2009,28(1):15-28.
[15]杨毅,多吉,刘鸿飞,等.西藏列廷冈铁多金属矿床辉钼矿Re-Os定年及其地质意义[J].中国地质,2014,41(5):1181-1191.
[16]张林奎,范文玉,高大发.西藏勒青拉铁铅锌矿床成矿模式[J].地球学报,2012,33(4):673-680.
[17]LANG Xinghai,TANG Juxing,LI Zjijun,et al.U-Pb and ReOs geochronological evidence for the Jurassic porphyry metallogenic event of the Xiongcun district in the Gangdese porphyry copper belt,southern Tibet,PRC[J].Journal of Asian Earth Sciences,2014,79(2):608-622.
[18]ZHAO Junxing,QIN Kezhang,LI Guangming,et al.Collision-related genesis of the Sharang porphyry molybdenum deposit,Tibet:Evidence from zircon U-Pb ages,Re-Os ages and Lu-Hf isotopes[J].Ore Geology Reviews,2014,56:312-326.
[19]孙广沅,莫江平,郝以顺,等.西藏达龙钨钼多金属矿床矿化分带特征[J].矿产与地质,2017,31(1):46-52.
[20]张晓东,方捷,张定源,等.激发极化法在东溪金矿接替资源勘查中的应用[J].物探与化探,2017,41(3):445-451.
[21]王富春,李玉龙,鲁海峰,等.青南纳日贡玛斑岩型铜钼矿床物化探异常特征及找矿模型[J].物探与化探,2016,40(6):1055-1062.
[22]王宏宇,李涛.双频激电法在西澳矿产勘查中的应用[J].物探与化探,2016,40(5):923-928.
[23]周云海,王备战,樊金生,等.物探方法在谢坑矽卡岩型金铜矿勘查中的应用效果[J].矿产与地质,2006,20(4/5):548-551.
[24]周多.激发极化法在辽宁本溪某矽卡岩型铜多金属矿勘查中的应用[J].地质与勘探,2016,52(4):688-694.
[25]孙仁斌.时间域激发极化法在内蒙古镶黄旗某锌钨多金属矿的应用[J].地质与勘探,2017,53(3):519-527.