共查询到20条相似文献,搜索用时 109 毫秒
1.
2.
3.
镇旬微细浸染型金矿地质特征与找矿方向 总被引:4,自引:0,他引:4
南秦岭公馆—回龙汞锑矿带北西边缘的旬阳县惠家沟金矿、小河金矿等微细浸染型金矿,是南秦岭最有前景的金矿类型之一。本文介绍了该类型金矿的地质特征,并对小河金矿和惠家沟金矿的异同进行了对比,分析了成矿控制条件,探讨了汞锑与金相互关系,指出了找矿方向。 相似文献
4.
5.
6.
内蒙古赤峰郊区索虎沟金矿矿脉与煌斑岩的成因联系 总被引:2,自引:0,他引:2
本文在对沟虎沟金矿区域地质背景、矿床地质地球化学和金的成矿作用的研究基础上,对煌斑岩的归属、地质地球化学特征及煌斑岩的形成时代和成因机制进行了讨论。着重对金矿脉与煌斑岩的密切时空关系和成因联系进行了剖析,最终确立了索虎沟金矿的煌斑岩成矿模式。煌斑岩与金矿代表了同一构造岩浆活动中两次既相对独立又有联系的热带件的产物,与上地幔地下地壳的局部重熔和岩浆分离结晶有关。 相似文献
7.
8.
9.
10.
本文在对索虎沟金矿区域地质背景、矿床地质地球化学和金的成矿作用的研究基础上,对煌斑岩的归属、地质地球化学特征及煌斑岩的形成时代和成因机制进行了讨论,着重对金矿脉与煌斑岩的密切时空关系和成因联系进行了剖析,最终确立了索虎沟金矿的煌斑岩成矿模式。煌斑岩与金矿代表了同一构造岩浆活动中两次既相对独立又有联系的热事件的产物,与上地幔和下地壳的局部重熔和岩浆分离结晶有关。 相似文献
11.
In Zhangbaling Tectonic Belt,two types of mineralization,auriferous quartz veins and alteration halos,can observed within many deposits.The pressure of metallogenesis of auriferous alteration halos is much higher than that of quartz vein,the temperatures of metallogeneses of these two types of orebodies are don't the same Geochemistry study indicates that both of them are micro-mesothermal deposits related to Yanshanian granites.The results of proton microprobe analysis of sulphides from the gold deposits in the area show that the "invisible" gold existed in sulphides is in the form of micro inclusions,and the concentration of "invisible" gold in sulphide minerals within quartz vein is poorer than that from alteration halos.Field observation shows that the structural modality of the fractures controlling the orebodies of auriferous quartz vein is different from that of the auriferous alteration zones.The fracture controlling the orebodies of auriferous alteration halos is compress-shear fracture,auriferous quartz vein is controlled by extensive fault.The alteration halos crosscut by auriferous quartz vein.The wallrocks of the former altered strongly and developed alteration zones well.The wallrocks of auriferous quartz vein altered slightly.The results of tectonogeochemical study shows that the concentration of associated metallogenesis elements and intensity of alteration are positively correlated with tectonic deformation strength for auriferous alteration halos.It indicates that it is probably a general character for micro-mesothermal gold deposits due to the multistages of metallogeneses took place.The tectonic environment is the most important fact determining the mechanism of fluid flow and precipitation of gold,and then the types of mineralization and modes of gold. 相似文献
12.
韧性剪切带中含金石英脉的就位机制 总被引:1,自引:0,他引:1
本文以韧性剪切带中含金石英脉的地质特征分析为基础。重点讨论:a.绿片岩相—低角闪岩相环境中的韧性剪切带内,变形岩石的韧—脆性转变既受温度、压力条件控制,又受高压流体相的广泛介入影响。对于多阶段金矿化过程,流体相的存在对岩石力学性质的转变具有更重要的意义;b.Roberts(1987)论述的含矿Riedal裂隙系(D、P、R、R′和T、P′)中不同类型裂隙内含金石英脉的就位机制有很大的差异;c.Ramsay的破裂—愈合机制可以很好地解释沿R、R′、T和某些沿D、P就位的含金石英脉的形成;d.本文作者提出液压扩容破裂机制是沿D、P方向就位的某些含金石英脉的重要就位过程。 相似文献
13.
14.
云南墨江金矿床含金硅质岩的地球化学特征和成因 总被引:22,自引:1,他引:21
中石炭统金厂组(C2j)下部含金硅质岩是云南墨江金矿庆的主要围岩之一,具有沉积结构构造,含热水沉积矿物。岩石的FeO、Fe2O3、Au和Ag含量高;Cr、Ni和Co含量高、变化大;MnO/TiO2和TFe/TiO2比值较大;Au含量与NiCr含量相关性低,Au可能不是后期热液作用带入的。在判别硅质岩形成作用的一系列元素和微量元素关系图上,含金硅质岩位于热水沉积作用的范围内或接近于热水沉积作用。岩石 相似文献
15.
16.
17.
18.
19.
20.
Geochemical Features and Formation of the Auriferous Cherts in the Mojiang Gold Deposit,Yunnan 总被引:1,自引:0,他引:1
Auriferous cherts in the Middle Carboniferous Jinchang Formation are the dominant host rocks of auriferous quartz veins and mixed orebodies comprised of gold-bearing quartz veins and cherts in the Mojiang gold deposit.The rocks exhibit sedimentary texture and structure and are composed of hot-water deposited minerals.The FeO,Fe2O3,Au and Ag contents of the auriferous cherts are high;the Cr,Ni and Co contents are also high but significantly variable;MnO/TiO2 and TFe/TiO2 ratios are relatively higy.As viewed from a few diagrams that distinguish different chert formations,the auriferous cherts are in or near the range of hot-water deposited cherts.Because the correlation coefficients between Au contents and those of Cr, Ni of the rocks are negative,a great Au amount in the cherts might not be brought about by later hydrothermal alterations.The rare-earth elements,O and Si isotopic compositions of the auriferous cherts demonstrate that the cherts belong to hot-water deposited rocks.The later hydrothermal alterations made the petrochemical compositions of the cherts deviate from the characteristics of hot-water deposition.In general,the geological and geochemical features of the auriferous cherts demonstrate that the rocks were formed by hot water deposition. 相似文献