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中國鎢鑛成因及分類之我見 总被引：1，自引：0，他引：1
地質論評第二卷第五期載有張君兆瑾之‘中國鎢鑛之成因及分類’,又第三卷第一期載有胡君伯素之‘中國鎢鑛分類之我見’,關於成因分類等之研究,該二文中,實多閘发,足供 相似文献
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庐枞盆地中发育一些大中型硫铁矿床,曾长期被认为是与次火山岩有关的中低温热液成因。本文从矿床层控特点、矿体形态产状、矿石沉积组构、矿物组合及其生成顺序、矿化分带、包裹体及同位素地球化学等诸方面,证明它们具显著的火山喷气沉积成因特征,并受到后期热液叠加改造。提出了大鲍庄式陆相火山喷气沉积-热液叠加改造型硫铁矿的成矿模式。 相似文献
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The major gold deposits in east China are characterized by their occurrence in pre-Cambrian host metamorphic rocks,restriction in some specific stratigraphic-structural terranes,tendentious localization in ductile or ductile-brittle shear zones,association with the syntexis type granitoids,and significant remobilization,superimposition and enrichment by the later stage Mesozoic tectono-magmatic activities. 相似文献
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论华南喷流－沉积块状硫化物矿床 总被引：27，自引：1，他引：27
现代海底喷流－沉积硫化物矿床的发现极大地推动了海底热液成矿理论的发展，也大大地提高了对古代海底喷流块状硫化物矿床的研究水平。本文指出喷流－沉积是重要的成矿作用，提出喷流－沉积矿床是华南Ｃｕ、Ｐｂ、Ｚｎ、Ｓｎ、Ａｇ、Ａｕ等矿产资源的重要来源，形成了一批超大型矿床，并将华南许多曾被认为属夕卡岩型的矿床重新确认为喷流－沉积矿床。文章还论述了华南喷流－沉积块状硫化物矿床的特征、分类、时空分布及其成矿特点等问题，提出断裂拗陷带型喷流－沉积块状硫化物矿床是华南具有特色的类型，而陆相断陷盆地中喷流－沉积矿床值得进一步深入研究 相似文献
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关于锡矿成因的若干认识——以大厂、个旧锡矿为例 总被引：2，自引：0，他引：2
锡矿的成因,70年代以前一般认为主要与花岗岩有关:花岗岩提供了气化热液及有关的成矿物质。其基本依据主要有三个:(1)世界上主要的锡矿床几乎都与花岗岩伴生;(2)与锡矿相伴生的一些花岗岩含锡量比较高,且富含挥发份,在岩体顶部这些特征更加明显;(3)一些锡矿体内矿脉的产状及其成分表明它们是由外来物质充填或交代形成的。 相似文献
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银岩斑岩锡矿产于花岗质岩浆演化晚期所形成的浅成侵位的隐伏花岗斑岩小岩株中。花岗斑岩自下而上表现出强烈的蚀变分带：较新鲜的花岗斑岩(其中发育弱钾长石化)→黑鳞云母云英岩化→黄玉云英岩化→绢英岩化→顶部硅化核。矿化主要富集在黄玉云英岩化带。通过对矿物学、岩石学和微量元素等一系列地球化学特征的研究，作者认为银岩斑岩锡矿应属于华南陆壳改造型花岗岩类成岩成矿系列的斑岩锡矿。 相似文献
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夹皮沟金矿带韧性剪切变形中的水岩反应及物质组分变化规律” 总被引：6，自引：1，他引：6
夹皮沟金矿北西向剪切带存在着长英质和镁铁质两类糜棱岩系列岩石，韧性变形中伴随的大量流体与糜棱岩之间发生了强烈的水岩反应：斜长石绢云母化和钠化，暗色矿物绿泥石化，以及大范围强烈的碳酸盐化。 相似文献
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Two kinds of mylonite series rocks,felsic and mafic,have been recognized in the NW-striking shear zone of the Jiapigou gold belt.During ductile deformation, a large amount of fluid interacted intensively with the mylonite series rocks:plagioclases were sericitized and the An values declined rapidly,finally all of them were transformed to albites;dark minerals were gradually replaced by chlorites(mostly ripidolite).Meanwhile,large-scale and extensive carbonation also took place,and the carbonatization minerals varied from calcite to dolomite and ankerite with the development of deformation.Theδ^13 Cvalues of the carbonates are-3.0‰--5.6‰suggesting a deep source of carbon.The ductile deformation is nearly an iso-volume one(fv=1).With the enhancement of shear deformation,SiO2 in the two mylonite series rocks was depleted,while volatile components such as CO2 and H2O,and some ore-forming elements such as Au and S were obviously enriched.But it is noted that the enrichment of Au in both the mylonite series rocks did not reach the paygrade of gold.The released SiO2 from water-rock interactions occurred in the form of colloids and absorbed gold in the fluid.When brittle structures were formed locally in the ductile in the ductile shear zone,the ore-forming fluids migrated to the structures along microfractures,and precipitated auriferous quartz because of reduction of pressure and temperature.Fluid inclusion study shows that the temperature and pressure of the ore-forming fluids are 245-292℃and 95.4-131.7MPa respectively;the salinity is 12.88-16.33wt% NaCl;the fluid-phase is rich in Ca^2 ,K^ ,Na^ ,Mg^2 ,F^- and Cl^-,while the gaseous phases are rich in CO2 and CH4.The δD and δ^18O values of the ore-forming fluid are -84.48‰--91.73‰and -0.247‰- 2.715‰respectively,suggesting that the fluid is composed predominantly of meteoric water. 相似文献