中国钼矿主要矿集区及其资源潜力探讨   总被引：18，自引：0，他引：18       下载免费PDF全文

黄 凡陈毓川  王登红袁忠信 陈郑辉 《中国地质》2011,38(5):1111-1134

钼矿是中国的优势矿种之一,在全国范围内均有分布。矿床成因类型以斑岩型、矽卡岩型和热液脉型为主,成矿时代以中生代和新生代为主。新世纪,随着科技进步,钼的应用领域逐渐扩大,带动了中国钼矿的勘探和开采工作,取得了一系列找矿新突破,特别是在非传统的钼矿产区发现了许多大型和超大型钼矿,使中国钼矿资源量有了大的突破,基本上改变了过去"南钨北钼"的原有格局。本文在广泛搜集资料的基础上,总结了中国钼矿资源特点,并综合考虑岩浆、构造、地层、流体、成矿时代等因素,初步将中国钼矿划分为17个大的矿床集中区(矿集区),简单介绍了矿集区的基本地质特征和成矿特征,给出了几个最重要矿集区的区域成矿模式,同时根据已有资料和找矿新进展,对主要钼矿矿集区进行了资源潜力分析,并对中国钼矿找矿工作提出了建议。  相似文献   

Re–Os and U–Pb Geochronology of the Erlihe Pb–Zn Deposit, Qinling Orogenic Belt, Central China, and Constraints on Its Deposit Genesis     

ZHANG Fan  LIU Shuwen  LI Qiugen  SUN Yali  WANG Zongqi  YAN Quanren  YAN Zhen 《《地质学报》英文版》2011,85(3):673-682

The Erlihe Pb–Zn deposit is an important mine of the Pb–Zn metallogenic zone in the South Qinling Orogen. It has been considered a sedimentary exhalative deposit in previous investigations because the ore body occurs concordantly at the transitional location of an upright fold. Re and Os isotopic analyses for paragenetic pyrites with sphalerite and galena from the ore body have been used to determine the timing of mineralization and to trace the source of metallogenic materials. The Re–Os isotopic data of four pyrite samples construct an isochron, yielding a weighted average age of 226±17 Ma (mean square weighted deviation=1.7), which is considered the main mineralization age. A dioritic porphyrite vein sample, showing weaker mineralization, was also dated using the SHRIMP zircon U–Pb isotopic method to constrain the youngest metallogenic age of the ore deposit, because it distributes along a group of tensional joints cutting not only the upright fold in the deposit field, but also the main ore bodies. The dioritic porphyrite sample yields a weighted mean 206Pb/238U age of 221±3 Ma, which is slightly younger than the Re–Os isotopic isochron age of the pyrites, considered as the upper age limit of the mineralization, namely the ending age of the mineralization. The Os isotopic compositions of sulfide minerals distribute within a range between Os isotopic compositions of the crust and the mantle, indicating that the ore deposit can be derived from magma-related fluid, and the metallogenic materials are most likely derived from the mixing source of the crust and the mantle. The Erlihe Pb–Zn deposit and associated dioritic porphyrite vein, important records of Qinling tectonic–magmatism–mineralization activities, were formed during the Triassic collisional orogeny processes.  相似文献   

Geological, geochemical characteristics and isotope systematics of the Longqiao iron deposit in the Lu-Zong volcano-sedimentary basin, Middle-Lower Yangtze (Changjiang) River Valley, Eastern China   总被引：8，自引：0，他引：8  

Zhou Taofa  Wu Mingan  Fan Yu  Duan Chao  Yuan Feng  Zhang Lejun  Liu Jun  Qian Bing  Franco Pirajno  David R. Cooke 《Ore Geology Reviews》2011,43(1):154-169

The Middle-Lower Yangtze (Changjiang) River Valley metallogenic belt is located on the northern margin of the Yangtze Craton of eastern China. Most polymetallic deposits in the Changjiang metallogenic belt are clustered in seven districts where magmatism of Mesozoic age (Yanshanian tectono-thermal event) is particularly extensive. From west to east these districts are: E-dong, Jiu-Rui, Anqing-Guichi, Lu-Zong, Tong-Ling, Ning-Wu and Ning-Zhen. World-class iron ore deposits occur in the Lu-Zong and Ning-Wu ore clusters, which are mainly located in continental fault-bound volcanic-sedimentary basins. One of these deposits is the Longqiao iron deposit, discovered in the northern part of the Lu-Zong Basin in 1985. This deposit consists of a single stratabound and stratiform orebody, hosted in sedimentary carbonate rocks of the Triassic Dongma'anshan Formation. A syenite pluton (Longqiao intrusion) is situated below the deposit. The iron ore is massive and disseminated and the ore minerals are mainly magnetite and minor pyrite. Wall rock alteration mostly consists of skarn minerals, such as diopside, garnet, potassic feldspar, quartz, chlorite, phlogopite and anhydrite. Thin sedimentary siderite beds of Triassic age occur as relict laminated ore at the top and the margin of the magnetite orebody. These sideritic laminae are part of Triassic evaporite-bearing carbonate deposits (Dongma'anshan Formation).Sulfur isotopic compositions show that the sulfur in the deposit was derived from a mixture of magmatic hydrothermal fluids and carbonate–evaporite host rocks. Similarly, the C and O isotopic compositions of limestones from the Dongma'anshan Formation indicate that these rocks interacted with magmatic hydrothermal fluids. The O isotopic compositions of the syenitic rocks and minerals from the deposit show that the hydrothermal magnetite and skarn minerals were formed from magmatic fluids. The Pb isotopic compositions of sulfides are similar to those of the Longqiao syenite. Phlogopite coexisting with magnetite in the magnetite ores yielded a plateau age of 130.5 ± 1.1 Ma (2σ), whereas the LA-ICP MS age of the syenite intrusion is 131.1 ± 1.5 Ma, which is slightly older than the age of phlogopite.The Longqiao syenite intrusion may have crystallized from a parental alkaline magma, generated by partial melting of lithospheric mantle, during extensional tectonics. The ore fluids were probably first derived from magma at depth, later emplaced in the sedimentary rocks of the Dongma'anshan Formation, where it interacted with siderite and evaporite-bearing carbonate strata, resulting in the formation of magnetite and skarn minerals. The Longqiao iron deposit is a skarn-type stratabound and stratiform mineral system, genetically and temporally related to the Longqiao syenite intrusion. The Longqiao syenite is part of the widespread Mesozoic intracontinental magmatism (Yanshanian event) in eastern China, which has been linked to lithospheric delamination and asthenospheric upwelling.  相似文献   

不同氧化锰矿物对光催化降解苯酚的影响   总被引：1，自引：0，他引：1  

张嵌  冯雄汉  邱国红  谭文峰  刘凡  LIU Fan 《矿物学报》2011,31(2):263-273

合成层状结构的酸性和碱性水钠锰矿以及隧道结构的锰钾矿和钙锰矿,将其用于苯酚的光催化降解研究。分别采用X射线衍射(XRD)、原子吸收光谱(AAS)、扫描电镜(SEM)、BET氮气吸附法和紫外可见漫反射光谱(UV-Vis DRS)对供试锰氧化物的晶体结构、化学组成、微观形貌、比表面积以及光吸收性能等进行了表征。研究表明,暗反应条件锰氧化物对苯酚的降解作用较弱,而UV-Vis光照能显著促进锰氧化物对苯酚的降解。光照反应12 h后,锰钾矿、酸性水钠锰矿、钙锰矿以及碱性水钠锰矿的苯酚降解率分别为92.1%、77.3%、57.4%和45.8%;对应的TOC去除率分别由暗反应时的6.3%、11.2%、2.0%和4.6%提高至62.1%、43.1%、25.4%和22.5%。4种供试锰氧化物均具有光催化活性,其大小顺序为:锰钾矿>酸性水钠锰矿>钙锰矿>碱性水钠锰矿。UV-Vis光照下氧化锰矿物光化学降解苯酚主要存在3种降解机制———苯酚的直接光解,锰氧化物的化学氧化和锰氧化物的光化学催化,其中光催化降解起主导作用。  相似文献   

碎屑锆石对班公湖地区晚侏罗世-早白垩世沉积物源的制约   总被引：2，自引：0，他引：2       下载免费PDF全文

樊帅权  史仁灯  丁林  张国凯 《地质科学》2011,(3):847-864

本文对班公湖地区中生代沙木罗组（J3—K1s）和日松组（J3r）地层的碎屑锆石进行了形态学及U-Pb年代学的研究。结果表明：锆石颗粒粒径约为100～150 μm,内部结构清晰,晶体为长柱状,自形程度较高,多数锆石不含暗色包体及浑圆形内核; 有些锆石颗粒有扇型分带结构。Th/U比值较大,多数大于0.1,均值约为0.86,说明岩浆的成因以锆石为主体,部分颗粒或晶体可能为变质成因; 锆石年龄主要分布在6个区间范围内： 1）180～100 Ma, 2）350～180 Ma, 3）600～450 Ma, 4）1100～600 Ma, 5）1800～1400 Ma, 6）2200～1800 Ma。锆石U-Pb年龄谱对应了羌塘地块经历的几次构造热事件,验证了晚侏罗世—早白垩世班公湖地区的物源主要来自其北部的羌塘地块。  相似文献   

塔里木盆地柯坪地区奥陶系鹰山组台内滩储层地层特征对比研究:以石灰窑和大湾沟剖面为例          下载免费PDF全文

胡晓兰  樊太亮  于炳松  高志前  王建平  李让彬 《地学前缘》2011,18(3):339-346

塔里木盆地碳酸盐岩礁滩体储层已经成为当前油气勘探的热点.以塔里木盆地柯坪地区石灰窑和大湾沟露头剖面为例,对奥陶系鹰山组台内滩地层的岩相组成及层序地层特征两个方面进行深入对比研究,并在此基础上分析了碳酸盐岩台内滩地层发育的控制因素.结果表明:(1)石灰窑地区和大湾沟地区鹰山组地层发育特征存在差异,石灰窑剖面以薄层颗粒灰岩...  相似文献   

基于城市化的中国能源消费前景分析及对碳排放的相关思考   总被引：3，自引：0，他引：3  

樊杰  李平星 《地球科学进展》2011,26(1):57-65

工业化和城市化是中国未来的两大发展趋势.以往对中国未来能源消费及碳排放的预测大都是从工业化层面出发,忽略了城市化过程导致的生活能源消费的巨大增量.推动城市化进程是提升生活质量、满足人的基本权利的重要手段;立足城市化进程,保障人均能源消费及碳排放空间是确保人人享有基本的生存权和发展权的重要基础.从对中国城市化进程的发展态...  相似文献   

Development of 57 novel polymorphic microsatellite markers in half-smooth tongue sole (Cynoglossus semilaevis)     

Guidong Miao  Ying Xu  Di Wang  Songlin Chen  Tingjun Fan  Yongsheng Tian 《中国海洋大学学报(英文版)》2011,10(3):241-245

Half-smooth tongue sole (Cynoglossus semilaevis) is a promising species for aquaculture in China.The wild population of C. semilaevis is under threat from environmental factors. Microsatellite markers are very suitable for assessing genetic diversity. Four microsatellite-enriched libraries of half smooth tongue sole (Cynoglossus semilaevis) were constructed,from which 57 polymorphic microsatellites were isolated and characterized.The polymorphism of these microsatellites was assessed by genotyping in 30 ind...  相似文献   

汶川地震灾后重建地区的人口容量分析     

高晓路  陈田  樊杰 《地理学报(英文版)》2011,21(3):521-538

Assessment of population carrying capacity is a key task in the reconstruction planning of areas struck by disasters, in which the precision of estimation is required. This study developed a decision-making model for estimating the population capacity of the involved townships and cities in the 2008 Wenchuan Earthquake based on the assessment of the suitability for reconstruction of the areas. Through analysis, arable land resources were argued to be the critical constraint of population capacity in these areas. Then, the spatial differentiations of the post-quake development conditions across different regions were analyzed with respect to their natural environments, socio-economic development and quake damages. The expected levels of urbanization, family incomes and income structures, output levels of land, and the reliance of agricultural population on arable land were estimated by different regions. With these parameters, the population capacities of the involved townships and cities in three scenarios were estimated. The total population capacity of the entire areas is abundant compared with the actual post-quake population; however, the status of over-population substantially varies across space. It was suggested to put the emphasis of post-quake resettlement policy on those counties where earthquake had been the main causes of over-population. In the Full Recovery Scenario, three mountain counties were identified including Wenchuan, Beichuan and Maoxian, with a total over-population of about 100,000 people.  相似文献   

真鲷（Pagrus major）vasa基因5′端启动子克隆及表达载体构建          下载免费PDF全文

林帆  刘清华  李军  隋娟  肖志忠  徐世宏  马道远  肖永双 《海洋与湖沼》2011,42(2):186-192

采用染色体步移（Genome walking）的方法克隆了真鲷vasa基因5′侧翼序列,采用生物信息学方法分析潜在的顺式作用元件,并与斑马鱼核心启动子进行比对,在此基础上构建了绿色荧光蛋白表达载体。序列分析结果显示：克隆得到的真鲷vasa基因5′侧翼序列序列长度为2762bp,其中包括TATA-box、CAAT-box...  相似文献