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云南白牛厂银多金属矿床成矿作用特征的稀土元素地球化学约束 总被引:1,自引:0,他引:1
为了研究白牛厂银多金属矿床成矿作用特征,对矿区岩浆岩、围岩和矿石的稀土元素进行了ICP-MS分析测试。花岗岩稀土元素组成表现了较强的Eu负异常和弱的Ce负异常。围岩稀土元素特征表现出一定程度的热水沉积成因。矿石的稀土元素组成大致可分为两组:一组矿石表现为Eu正异常或无异常和Ce负异常,反映喷流沉积稀土元素组成特征,主要是距离花岗岩体较远的白羊矿段,指示成矿热液为温度较高(>250℃)、相对还原的流体,另外,Eu正异常和Ce负异常同时出现,说明矿石沉淀时较高温度的流体与少量的海水发生了对流混合;另一组矿石表现出与岩浆岩一致的球粒陨石标准化稀土配分模式,显示岩浆热液叠加改造成因,主要是距离花岗岩体较近的穿心洞矿段和对门山矿段。两组矿石稀土元素组成特征总体来说随着花岗岩体距离的变化而变化。根据岩浆岩、围岩和矿石的稀土元素组成特征,白牛厂银多金属矿床由喷流沉积形成主矿体,燕山期花岗质岩浆活动对矿体部分叠加改造。 相似文献
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宁蒗地区白牛厂铅锌矿区位于区域性牛窝子-罗卜地帚状结构的内旋断裂带-白牛厂弧形断裂的折拐部位。该部位喜马拉雅晚期隐伏含矿斑岩体发育,其围岩地层-下二叠统(Plx)灰岩亦具一定的含矿性。由白牛厂弧形断裂伴生的低级次白牛厂帚状断裂构造带又为本区矿液运移和矿体赋存提供了良好通道和有利空间。在白牛厂隐伏斑岩体与其围岩(P1x灰岩)的外接触带、构造叠合地段,有望形成斑岩体外接触带热液型铅锌(银)多金属矿床。 相似文献
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滇东南白牛厂多金属矿床铅同位素组成及铅来源新认识 总被引:1,自引:0,他引:1
白牛厂矿床位于滇东南锡多金属成矿带中部,是一个Ag、Pb、Zn、Sn等共生的多金属矿床,但成因争议较大.前人引用早期矿床矿石矿物铅同位素数据得出矿石铅主要来源于基底岩石淋滤,矿床经历了热水沉积+岩浆热液叠加两个成矿阶段的结论.本文采用最新铅同位素数据系统研究了白牛厂矿床的铅同位素组成,其中,白牛厂矿床矿石矿物的铅同位素组成206Pb/204Pb、207Pb/204Pb和208Pb/204Pb分别为17.264~18.537、14.843~15.862和38.481~39.424;薄竹山花岗岩长石铅同位素组成206Pb/204Pb、207Pb/204Pb和208Pb/204Pb分别为18.301~18.387、15.611~15.670和38.677~38.904;薄竹山岩体接触带型矿床(点)矿石矿物铅同位素组成206Pb/204Pb、207Pb/204Pb和208Pb/204Pb分别为18.302~18.417、15.603~15.692和38.596~38.868;区域地层及矿区地层钻孔样品铅同位素组成206Pb/204Pb、207Pb/204Pb和208Pb/204Pb分别为18.307~19.206、15.622~15.809和38.436~39.932.对比四者铅同位素组成特征,白牛厂矿床矿石矿物、薄竹山花岗岩长石、薄竹山岩体接触带型矿床(点)矿石矿物具有一致的铅同位素组成,与地层铅同位素组成相差甚远,表明白牛厂矿床铅主要来自岩浆作用,在侵入的过程中可能受到了地层的轻度混染.矿床地质特征及近期地球化学和年代学研究成果表明,白牛厂矿床的形成主要受岩浆作用影响,沉积成矿作用在白牛厂矿床很可能是不存在的. 相似文献
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The Bainiuchang deposit in Yunnan Province, China, is located geographically between the Gejiu ore field and the Dulong ore
field. In addition to >7000 t Ag reserves, the deposit possesses large-scale Pb, Zn, Sn reserves and a mass of dispersed elements
(i.e., In, Cd, Ge, Ga, etc.). Based on systematic studies of sulfur isotopic composition, the authors conclude: The Bainiuchang
deposit experienced two epochs of metallogenesis, i.e., the Middle-Cambrian sea-floor exhalative sedimentary metallogenic
epoch and the Yanshanian magmatic hydrothermal superimposition metallogenic epoch. In the two metallogenic epochs, the δ34S values of sulfides were all near 0, showing a tendency of being enriched slightly in heavy sulfur. The δ34S values of sulfides in the early metallogenic epoch are within the range of 2‰–5‰ with a peak value range of 2‰–3‰ and an
average of 3.0‰, and those of sulfides in the late metallogenic epoch are within the range of 2‰–6‰ with a peak value of 3‰–4‰
and an average of 3.9‰. For the single metallogenic epoch, sulfur in the ore-forming fluids in the early epoch already reached
isotopic equilibrium and was derived mainly from underneath the magma chamber or basement metamorphic igneous rocks. Sulfur
in the sulfides in the late epoch was derived mainly from magmatic hydrothermal fluids formed in the process of remelting
of the basement metamorphic igneous rocks. 相似文献
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