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1.
山东玲珑和焦家金矿成矿深度研究与测算   总被引:5,自引:0,他引:5  
吕古贤  孔庆存 《地质论评》1996,42(6):550-559
应用构造作用力影响静水压力的理论,用构造校正方法,测算了玲珑-焦有式金矿的成矿深度。焦家金矿Ⅰ、Ⅱ号矿体形成深度为2243.6m±,Ⅲ号矿体脉群形成深度为1632.4m±(105Ma±),玲珑金矿四个成矿阶段的深度分别是3455m±(213Ma±),1914.4m±(100.28Ma±),1091m±(80.67Ma±)和721m±(71.86Ma±)。  相似文献   

2.
海南抱板金矿田流体包裹体地球化学研究   总被引:4,自引:0,他引:4  
对海南抱板金矿田的外山,抱板和二甲等三个金矿进行的液体包裹体研究表明成矿流体为低盐度(0.1-6wt%NaCl),中低温(200-240℃)热液,处于中低压力(60-160MPa)下,其CO2含量较低,探针质谱分析表明流体包裹体中存在H2S,结合SO^2-4的存在,金在热液中可能是以硫氢络合物的形式迁移的。  相似文献   

3.
邱小平  潘淼 《黄金地质》1997,3(4):29-35
小营盘金矿赋存在稳定的缓倾斜石英脉中,但单纯的白色石英脉仅有微弱矿化,只有经过S懊断层剪切拉张破裂和叠加铁白云石化及硫化物蚀变的石英脉才能成为矿体,金矿体的顶底面常被铁白云石蚀变岩和糜棱岩所包裹,而且部分蚀变岩的金含量也达到工业品位,石英脉与蚀变岩作用构成矿体。因此,早期金成矿作用的时代大致与铁白云蚀变同期,含金铁白云石蚀变岩的δ^13C值平均为-4.13‰,Pb-Pb等时线年龄为2711±238  相似文献   

4.
梁新权 《岩石学报》1995,11(1):71-76
利用Sm-Nd同位素法测试了海南岛土外山金矿区花岗-绿岩系的15个样品,7个为绿岩中的斜长角闪片岩,8个为花岗(质)岩,分别获得了1700.9±20Ma和1379.7±17Ma的Sm-Nd等时年龄,各自代表了其原岩的成岩时代。同时对花岗(质)岩获得了与1700.9013220Ma相当的1690~1800Ma的Nd模式年龄。对斜长角门片岩则获得2300~2700Ma的Nd模式年龄。这些反映了海南岛于2400Ma、1700Ma、1400Ma左右发生了三次重大构造岩浆热事件。  相似文献   

5.
冀东高级变质岩石的流体包裹体研究   总被引:5,自引:5,他引:5  
刘树文 《岩石学报》1995,11(4):375-385
冀东高级变质的石榴石斜长片麻岩、含或不含石榴石的角闪二辉斜长片麻岩、紫苏花岗岩、斜长角门岩等岩石中的流体包裹体主要有4类,按形成的先后顺序依次为:(1)H2O和CO2两液相包裹体,CO2的部分均一温度是-12℃,密度1.04g/cm3,H2O含量21%~39%(mole%),CO2含量50%~71%(mole%);(2)CO2液相包裹体,冰点温度-56℃~-61℃,均一温度-7.4℃~-35.1℃,CO2密度约为1.05g/cm3,CO2含量82.1%~98.4%(mole%),还有少量的CH4、N2和H2等组分;(3)H2O和CO2多相包裹体,CO2的部分均一温度7℃~28℃,CO2密度为0.64~0.93g/cm3,气相组分以CO2、CH4和CO为主,液相成分主要是H2O和CO2;(4)多世代盐水溶液包裹体,冰点温度-0.5℃~-20℃,盐度0.87%~22.8%(wt%),盐水密度0.7~1.05g/cm3,均一温度在150℃~200℃和约300℃,存在两个峰值。不同世代的流体包裹体记录了等密度降温的P-T路径。包裹体反映的变质作用早期降温过程流体的H2O/H2O+CO2(mole)比值降低,晚期升高  相似文献   

6.
台湾金矿的化探与综合勘探刘家军,陶正章(成都理工学院,成都610059)关键词金矿,化探,综合勘探,台湾台湾的金矿主要为岩金矿,形成于燕山晚期-喜马拉雅山早期(0.9~1.6Ma)。岩金矿周围几乎均有砂矿产出。岩金矿主要分布在两个区域:(1)中央山脉...  相似文献   

7.
郭敬辉  翟明国 《岩石学报》1993,9(4):329-341
华北克通北缘中段怀安蔓菁沟高压麻粒岩混杂岩带产在太古宙怀安杂岩南缘与花岗岩带交界处,由高压其性麻粒岩,辉长质麻粒岩,英云闪长质麻粒岩和少量夕线石榴片麻岩相间排列的席状岩层物估算的早期高压变质作用条件:T=800C,P>1.4GPa。环绕斑晶的后成合晶反应边矿物组合的变质条件为:T=820C,P为0.7-0.9GPa。全岩Sm-Nd等时时线年龄2.65Ga,矿物Sm-Nd等年龄1.82Ga,锆石U-  相似文献   

8.
广东信宜东坑金矿地质特征及成因浅探   总被引:2,自引:0,他引:2  
张先学 《黄金地质》1997,3(3):42-47
东坑金矿地处云开加里东隆起带的东翼,吴川-四会大断裂的西侧,矿床赋存于震旦系云开群中亚群(Zynb)地层的中下部厚约80m的绿片岩带中。共圈出4个主矿体,其中最大矿体长1100m,平均厚度2.0m,平均品位5.58×10-6。矿石由石英细脉组成,矿床受区域脆-韧性剪切带控制,矿液来源于银岩花岗岩体的演化分异和对围岩的萃取。矿床形成温度为267~307℃,属岩浆热液交代-充填型中温热液矿床。  相似文献   

9.
彭少梅 《广东地质》1996,11(2):59-65
通过对粤北大沟谷碎裂钠长石岩型金属矿床流体包裹体的研究表明,该矿床成矿流体是震旦纪变质地层在同推覆期的动力分异热液。矿床的形成经历了5个矿化阶段(D^13-D^53)金矿化主要发生在D^23和D^43。矿床形成温度200~300℃,压力37.4~4.3MPa,为中低温,中浅成矿化。成矿流体pH为6.76~7.14,为弱酸-弱碱环境,流体为Na-Ca-Mg(F)-Cl型,金可能以硫络合物形式迁移。  相似文献   

10.
湖北蛇屋山金矿区风化型金矿床地质特征及成因浅析   总被引:5,自引:0,他引:5  
湖北嘉鱼蛇屋山金矿区风化型金矿床,矿体赋在于松散粘土层中,含不等量砾砂的粘土为含矿寄主岩。矿体呈似层状,产状平缓呈平卧状态。矿床规模大,长约1300m,宽约350m,面积达0.5km ̄2,矿体厚1.2~41.2m,Au品位(1.1~7.6)×10 ̄(-6)。矿石氧化程度高,金主要呈游离态次显微金形式存在。成矿控制因素主要受基岩岩性、地质构造环境和松散层性质。成矿物质主要来源于矿化原岩及下伏或附近基岩中的原生金矿体、具金矿化或金异常的含金地质体。矿床形成是表生风(红土)化作用的结果,为风化残积成因红土型金矿床。  相似文献   

11.
Lithostratigraphy, physicochemical stratigraphy, biostratigraphy, and geochronology of the 77–70 Ma old series bracketing the Campanian–Maastrichtian boundary have been investigated by 70 experts. For the first time, direct relationships between macro- and microfossils have been established, as well as direct and indirect relationships between chemo-physical and biostratigraphical tools. A combination of criteria for selecting the boundary level, duration estimates, uncertainties on durations and on the location of biohorizons have been considered; new chronostratigraphic units are proposed. The geological site at Tercis is accepted by the Commission on Stratigraphy as the international reference for the stratigraphy of the studied interval. To cite this article: G.S. Odin, C. R. Geoscience 334 (2002) 409–414.  相似文献   

12.
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14.
正1 Introduction Geological studies established on several sections in Lanping-Simao basin have shown that the salt-bearing strata of Mengyejing formation(Yunlong Fm.in Lanping basin)are constituted by an alternation of salt layers and interbedded facies.The latter consists mainly of mudstones,and mudstone-rich conglomerate.The mineralogy and geochemistry of salt-bearing beds and  相似文献   

15.
正On 22nd April 2014,with the approach of the 45th World Earth Day,China’s Ministry of Land and resources issued the status of China’s mineral resources in 2013.The first task of the prospecting breakthrough strategy action implemented in the last five years has been completed,and China’s security capacity for mineral resources has been significantly improved.In the  相似文献   

16.
正There are more than 700 salt lakes with area of more than 1km2 on the Qinghai-Tibet Plateau of China.In recent years,an oilfield brine was also found in the Nanyishan Section of Qaidam Basin in the Qinghai-Tibet  相似文献   

17.
正1 Introduction Physical and numerical models are constructed to investigate the evolution and mechanism of salt migration driven by tectonic processes.In recent years,we have designed and ran series of models to simulate salt  相似文献   

18.
正The study of Cretaceous-Palaeogene salt-bearing strata of the Khorat Basin Laos and the Lanping-Simao Basin in Yunnan,China has an great significance not only in explaining the basin evolution and the genesis of potash  相似文献   

19.
正Potash is one of the long-term scare deposits in China,and potash prospecting has long been listed as a key brainstorm project for our nation and geological prospecting units.There have been considerable studies in search for potash deposits in the Kuqa depression of the Tarim basin(Jackson et al.,1991;Gemmer et al.,2004;Vendeville,2005;Vendeville and Jackson,1992a,1992b),  相似文献   

20.
正1 Introduction Qaidam Basin in Qinghai,including 43 salt lakes with multiple dominant mineral such as potassium,magnesium,lithium etc.,is the most intensive distribution of Saline  相似文献   

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