凡口铅锌矿床同位素地球化学证据   总被引：3，自引：0，他引：3  

汪礼明  徐文忻  李蘅  彭省临 《地球学报》2005,26(Z1):164-167

对凡口铅锌矿床不同成矿阶段进行矿物包裹体温度、硫和铅同位素测定，获得成矿第Ⅰ阶段温度为300±50℃，第Ⅱ、Ⅲ阶段温度为250±50℃；并获得矿床硫化物的S同位素组成为2.1‰～26.5‰，具有δ34SPy＞δ34SSp＞δ34SGn；第Ⅰ阶段硫化物的硫同位素组成随赋存层位由老到新硫同位素有逐渐减小趋势；第Ⅱ阶段硫化物的δ34S为14.3‰～23.8‰；第Ⅲ阶段硫化物的δ34S为5.7％~15.7‰，具有从早阶段至晚阶段硫同位素组成变化范围从大至小的减小趋势。分析获得68件铅同位素数据，其中硫化物的206Pb/204Pb比值为18.023～18.847；207Pb/204Pb比值为15.700～15.820；208Pb/204Pb比值为38.056～39.796。灰岩全岩的206Pb/204Pb比值为18.230～18.860；207Pb/204Pb比值为15.640～16.000；208Pb/204Pb比值为38.714～39.960。辉绿岩的206Pb/204Pb比值为18.570～18.650；207Pb/204Pb比值为15.260～15.620；208Pb/204Pb比值为38.650～38.960。第Ⅰ阶段δ34OH2O为13.3‰~13.1‰，δD为－50.2‰～－61.5‰；第Ⅱ阶段δ18OH2O为－2.4‰～＋10.8‰，δD为－50.2‰～－63.2‰；第Ⅲ阶段δ18OH2O为－4.9‰～－14.3‰，δD为－59.0‰～－61.0‰。  相似文献   

锌精矿氧压酸浸液中铟的提取研究   总被引：2，自引：0，他引：2  

杨仲平  靳晓珠  马亚君  施意华 《矿产与地质》2006,20(6):706-708

对锌精矿氧压酸浸液中铟的提取进行了研究,在1.0m o l/L的H2SO4介质中,铟可被P204定量萃取,当萃取相比为O/A=1/4,进行三级萃取,平衡时间为3m in时,In萃取率达97%以上;对负载有机相用3m o l/L的HC l进行三级反萃,O/A=5/1,平衡时间为3m in,In反萃率为99.62%。  相似文献   

桂林市乌金河流域污染分析     

雷金勇  黄伟  余谦  莫斌  徐文炘 《矿产与地质》2006,20(3):317-322

通过对乌金河流域点污染源的实测与面污染源的估算,初步确定点面污染源排污总量,并用单项超标法、等标污染负荷法对乌金河流域的水质进行评价,分析了流域的污染特征,同时对如何防治水污染提出了一些看法。  相似文献   

电吸附找矿法在捕获常规化探方法难以发现的异常时的有效性     

杨芳芳  卢宗柳  周奇明  陆一敢 《矿产与地质》2006,20(4):479-483

电吸附找矿法是一种针对寻找隐伏矿而研制的找矿新方法，它属金属活动态提取法的一种，其找矿原理是：深埋藏隐伏矿在地电化学作用下发生溶解，溶解出来的矿物质在各种迁移动力的驱动下，从地下深部向上运移到地表，进入土壤形成后生异常。后生异常组分多属活动态，但活动态组分不仅存在于后生异常中，也存在于同生异常——原生晕异常和次生晕异常中，因此，应用电吸附找矿法寻找露头矿和浅埋藏矿时，其效果与常规化探方法是一样的；但电吸附找矿法的主要作用是可应用于寻找深埋藏隐伏矿，因由隐伏矿引起的后生异常活动态组分含量很低，常规化探方法很难发现它，而电吸附找矿法却能捕获它。  相似文献   

绿柱石的成因与特征的研究   总被引：1，自引：0，他引：1  

阮青锋  张良钜  张昌龙  雷威  饶灿  廖宝丽  曾伟来 《矿产与地质》2008,22(3):265-269

绿柱石是提炼稀有金属铍的重要矿石矿物,也是重要的宝石矿物。文章从绿柱石的矿床特点、包裹体和谱学特征、绿柱石的优化处理及人工合成等方面,对国内近年来在绿柱石研究方面的进展进行了综述,并对绿柱石的研究方向提出了一些建议。  相似文献   

物探技术在那勤滑坡地质灾害勘察中的应用     

刘新华  李业君  张玉池 《矿产与地质》2008,22(4):370-372

在防城那勤滑坡体勘察中,利用多道瞬态瑞利面波法和高密度电阻率法等综合物探方法,准确地确定滑坡体的几何形态、滑坡体滑动的规模以及岩体的风化深度,为滑坡体的治理提供了全面、准确的数据资料,表明该方法在滑坡体治理中具有良好的应用效果。  相似文献   

桂中1井井中化探指标的异常特征和指示意义   总被引：2，自引：1，他引：1  

谷珊珊  陈远荣  贾国相  姚锦其  张志伟 《矿产与地质》2008,22(5):461-465

井中化探作为一种新的油气监测和早期盆地勘查评价的地球化学技术越来越引起人们的关注,文章优选了酸解烃（SC1-SC4）、热释烃（RC1-RC4）、二维荧光（FL327、FL327、FL399）、后生碳酸盐（△C）和热释汞（Hg）等作为评价指标,通过对桂中1井各种化探指标的异常特征分析,表明区内存在油气生成潜力,并指出了其主要生油气层段和储油气层段。  相似文献   

湖南香花岭锡多金属矿床同位素地球化学研究   总被引：4，自引：0，他引：4  

周涛  刘悟辉  李蘅  徐文炘  戴塔根 《地球学报》2008,29(6):703-708

笔者对湖南香花岭锡多金属矿床成矿期不同的矿物组合进行矿物包裹体温度和硫、铅同位素测定,获得了锡石-硫化物阶段平均-温度为350℃,硫化物阶段平均均-温度为250℃.锡石-硫化物中黄铁矿的δ34为-1.O‰～+5.4‰;闪锌矿的δ34S为+0.8‰-+5.8‰;磁黄铁矿的δ34S为+1.5‰～5.2‰;方铅矿的δ34S为-1.0‰+3.6‰,具有变化范围小,组成稳定的特点.方铅矿的206Pb/204Pb值为17.785～19.341,207Pb/204Pb值为15.416～16.452,208Pb/204Pb值为38.357～42.579.硫同位素指示硫来源于岩浆,铅同位素指示是多来源.  相似文献   

The Late Jurassic Zedong ophiolite: A remnant of subduction initiation within the Yarlung Zangbo Suture Zone (southern Tibet) and its tectonic implications     

《Gondwana Research》2020

The Zedong ophiolite is the largest ophiolite massif east of Dazhuqu in the Yarlung Zangbo Suture Zone in the southern Tibetan Plateau. However, its age, geodynamic setting and relationship to the Xigaze ophiolite remain controversial. New zircon U–Pb ages, whole-rock geochemical and Nd–Pb isotopic data from ophiolitic units provide constraints on the geodynamic and tectonic evolution of the Zedong ophiolite. U–Pb zircon geochronology of dolerite lavas and late gabbro–diabase dikes yield weighted mean ages of 153.9 ± 2.5 Ma and 149.2 ± 5.1 Ma, respectively. Strong positive ε_Nd(t) and positive Δ7/4Pb and Δ8/4Pb values indicate derivation from a highly depleted mantle source with an isotopic composition similar to that of the Indian MORB-type mantle. The geochemistry of ophiolitic lavas and early dikes are analogous to typical island arc tholeiites whereas late dikes are similar to boninites. The geochemistry of these rock types suggests multi-stage partial melting of the mantle and gradually enhanced subduction influences to the mantle source through time. Combined with the MORB-like 162.9 ± 2.8 Ma Luobusha ophiolitic lavas, we suggest that the Luobusha lavas, Zedong lavas and early dikes originated in an infant proto-arc setting whereas late dikes in the Zedong ophiolite originated in a forearc setting. Together, they represent a Neo-Tethyan subduction initiation sequence. The Late Jurassic intra-oceanic proto-arc to forearc setting of the Zedong ophiolite contrasts with the continental margin forearc setting for the Xigaze ophiolite, which suggests a laterally complex geodynamic setting for ophiolites along the Yarlung Zangbo Suture Zone.  相似文献   

Petrological,chemical and depositional aspects of eastern Himalayan coals from elephant flat area,Kameng district,Arunachal Pradesh,India     

《International Journal of Coal Geology》1987,8(3):279-297

The eastern Himalayan coals of India associated with Permian (Lower Gondwana) sediments in the Kameng district of Arunachal Pradesh have petrographic and chemical properties differing from Peninsular Permian coals.The coals are moderately to highly crushed and have reached a semianthracitic stage. Macerals are highly reflecting and homogenized. Vitrinite and inertinite exhibit a crushing effect in the form of criss-cross fissures and cracks. Exinite is unidentifiable and has attained an inertinitic reflectivity. The Kameng coals are of high rank with average fixed carbon 88.75% and volatile matter 13.75% on d.a.f. basis. The reflectance values (R_o-max 2.02–2.31% in oil) of these coals are quite high with marked anisotropy.It is inferred that these peculiar coal properties have been attained due to prolonged tectonic disturbance in the area during the later Himalayan orogeny. The coal characteristics suggest that these coals were formed in a humid tropical climate within a deltaic regime. The depositional site experienced occasional marine influx due to tectonically controlled subsidence during peat accumulation.  相似文献