川滇黔地区铅锌矿床稳定同位素地球化学研究现状综合分析   总被引：2，自引：0，他引：2  

仲文斌  张均  王健  杨青  张哲坤  程元路 《矿床地质》2017,36(1):200-218

川滇黔接壤区是中国重要的铅锌多金属成矿区,目前已经发现了会泽、天宝山、大梁子等超大型-大型铅锌矿床。文章通过系统总结分析区域内铅锌矿床稳定同位素(C、H、O、S同位素)数据,结合区域构造控矿特征,表明成矿热液的碳、氧主要来源于碳酸盐岩围岩,个别矿床可能有有机碳或幔源碳参与成矿作用。黔西北地区从靠SE侧威宁-水城构造带上的铅锌矿床至NW侧垭都-蟒硐构造带上的铅锌矿床,方解石的δ~(13)CV-PDB值从0.6‰~2.5‰转变为-5.3‰~1.5‰,δ18OV-SMOW值从23.3‰~25.5‰转变为11.3‰~20.9‰,均显示出逐渐变小的趋势;SN向小江断裂带内各矿床表现出线性关系,并且具有向δ~(13)CV-PDB、δ~(18)OV-SMOW都亏损的方向偏移趋势,NE向断裂带内的各矿床C、O同位素则表现为集中一致的分布特征。H、O同位素显示成矿流体具有建造水(热卤水和油田卤水)特征,部分可能有大气降水、变质水和岩浆水参与成矿作用。矿床硫源主要为同时代海水硫酸盐的热化学还原(TRS)形成的还原硫,个别矿床细菌还原硫酸盐(BSR)形成的富含轻硫的油气藏中的H2S可能为成矿过程提供了部分硫来源。黔西北地区铅锌矿床S同位素组成具有从SE侧至NW侧向轻硫方向偏移的趋势,SN向小江断裂带内铅锌矿床S同位素组成较为集中一致,NE方向断裂带内铅锌矿床S同位素则具有从SW侧至NE侧向轻硫方向偏移的趋势,TSR的反应强度和反应速率降低可能是导致向轻硫方向偏移的重要原因之一。  相似文献   

Geochemical evidence for strong ongoing methanogenesis in Sanhu region of Qaidam Basin     

SHUAI YanHua  ZHANG ShuiChang  SU AiGuo  WANG HuiTong  CAI BaoYuan & WANG Hui Research Institute of Petroleum & Development  Beijing  China 《中国科学:地球科学(英文版)》2010,(1)

Sanhu depression of Qaidam Basin is the largest biogenic gas production region in China.Headspace samples were collected from two wells in this region,and hydrogen and propylene compounds were detected in these samples with a certain concentration.The stable hydrogen isotope ratio of H 2 is relatively light (-700‰--820‰).The stable carbon isotope ratio of propylene ranges from -27‰ to -40‰,which coincides with the rule of change of the stable carbon isotope of kerogen at the corresponding horizon.The charac...  相似文献   

A Hybrid Approach: Indirect Electro‐Oxidation Followed by In Situ Electrogeneration of H2O2 in Real Textile Effluent          下载免费PDF全文

Priyadharshini Aravind  Rajeswari Selvaraj  Angappan Sankarmahalingam  Subramanian Kandasamy 《洁净——土壤、空气、水》2016,44(4):362-370

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地质勘探过程中煤层气联测氢气方法     

杨忠红  马婧 《四川地质学报》2009,29(2):244-246

瓦斯的危害和煤层气的利用,不断在推进着瓦斯地质理论、煤层气开发利用技术的进步和发展。在以往的诸多研究中,不论是防治瓦斯的危害还是着眼于煤层气的利用,甲烷都是研究的重点。但是,除甲烷之外,还有没有其它影响或控制瓦斯危害和煤层气利用的组分或因素呢？煤层气（瓦斯）联测氢气的方法和应用研究,就是循着这一思路而做的探索性工作。  相似文献   

Analyzing Effects of Shrub Canopy on Throughfall and Phreatic Water Using Water Isotopes,Western China   总被引：1，自引：0，他引：1  

Yuhong Liu  Zhen Xu  Fude Liu  Lixin Wang  Shuqing An  Shirong Liu 《洁净——土壤、空气、水》2013,41(2):179-184

Alpine shrub Quercus aquifolioides was selected to study the effects of shrub canopy on throughfall and phreatic water by analyzing the isotopic time series of precipitation, canopy throughfall and phreatic water and examining correlations among these series in Wolong Nature Reserve, Western China. Based on analysis of precipitation data in 2003, the local meteoric water line during the rainy season was δD = 8.28 × δ¹⁸O + 8.93, and the primary precipitation moisture in this region originated from the Pacific Ocean in the summer. Stable isotope analysis showed that the main supply of throughfall and phreatic water was from precipitation, and the shrub canopy has an important effect on the processes of rainwater transmuted into throughfall and phreatic water. Moreover, the differences of δD and δ¹⁸O values between rainwater and throughfall were relevant to rainfall. Due to interception of the shrub canopy, there had a response hysteresis of phreatic water to the various rainfall events, which was mostly 2 days, except that this hysteresis was ≤1 day when rainfall was >15 mm/day.  相似文献   

祁连山冻土区天然气水合物分解气碳氢同位素组成特征   总被引：4，自引：0，他引：4  

刘昌岭  贺行良  孟庆国  业渝光  祝有海  卢振权 《岩矿测试》2012,31(3):489-494

开展祁连山冻土区天然气水合物气体同位素研究,是解决其气体成因、来源等科学问题的一个重要手段。本研究采集祁连山南麓多年冻土区水合物科学钻探DK2和DK3孔共8个含水合物的岩芯样品,采用真空顶空法收集样品中水合物的分解气,分别用气相色谱(GC)、气相色谱同位素比值质谱(GC-IRMS)测定其气体成分和同位素组成,测试结果表明:祁连山冻土区天然气水合物样品的气体碳氢同位素变化较大,甲烷、乙烷和丙烷的碳同位素(δ13C)变化范围分别为-52.6‰～-48.1‰、-38.6‰～-30.7‰和-34.7‰～-21.2‰,而二氧化碳的碳同位素(δ13C)最低为-27.9‰,最高为16.7‰;甲烷、乙烷和丙烷的氢同位素(δD)变化范围分别为-285‰～-227‰、-276‰～-236‰和-247‰～-198‰。通过对这些碳氢同位素进行综合研究,包括气体分子组成与同位素的关系分析、甲烷的碳氢同位素之间的关系判断等,结果表明研究区天然气水合物的气体主要来源于热解气,而且是在淡水环境中形成的有机成因气。  相似文献   

MAGNETOTELLURIC SOUNDING AND LATERAL INHOMOGENEITIES IN THE LITHOSPHERE     

《International Geology Review》2012,54(11):1340-1369

ABSTRACT

Libyan Desert Glass (LDG), rediscovered in modern times in 1932, is an ultrahigh-temperature glass composed of nearly pure SiO₂. LDG is found as surface float in Egypt’s Libyan (Western) Desert, its strewnfield defined by the intersection of major faults. Extra-terrestrial components are present in LDG but there is no associated impact crater. LDG is not an impactite, nor do pieces exhibit aerodynamic forms. Extremely viscous silica remained hot long enough to flow several centimetres. Additional constraints on the origin of LDG are imposed by exotic materials found nearby: a dark 30-gram granular micro-diamond mass, mullite-magnetite-silica glass rocks with micro-diamonds, lumps of fine-grained magnetite, titanium filaments, titanium nitride, titanium aluminide, aluminium oxycarbonitride, phosphides, silver, zirconium, zinc, carbonaceous grains, and metal grains coated with carbonaceous materials. The region is underlain by 500–3000 m of flat-lying sandstone composed of quartz grains and little else. To account for LDG and the other unusual materials and nearby outgassing vents, serpentinization is evoked. Products of this complex low-temperature crustal process include serpentine, magnetite, aqueous silica, and great quantities of hydrogen. The hydrogen, produced in Basement rocks beneath the sandstones, may have risen along faults, passing around grains of quartz (with which it does not react) until slowed by tight conditions, perhaps self-sealed by silica produced during serpentinization. Columns of quartz hundreds or thousands of metres high with intergranular spaces filled with H₂ (±CH₄) may have been established with some hydrogen leaking into the surface domain while still more was produced at depth. Disturbance by occasional impacts or airbursts, large or small, would violently release great columns of pressurized hydrogen, which, ignited, would burn until exhaustion. Such sustained heating events could be repeated. Exotic products might come from materials formed cold in the outer solar system, transformed in a great flickering flame with temperatures perhaps exceeding 1800°C.  相似文献   

Fluid Inclusions and Hydrogen,Oxygen, Sulfur Isotopes of Nuri Cu‐W‐Mo Deposit in the Southern Gangdese,Tibet     

Lei CHEN  Kezhang QIN  Jinxiang LI  Bo XIAO  Guangming LI  Junxing ZHAO  Xin FAN 《Resource Geology》2012,62(1):42-62

The Nuri Cu‐W‐Mo deposit is located in the southern subzone of the Cenozoic Gangdese Cu‐Mo metallogenic belt. The intrusive rocks exposed in the Nuri ore district consist of quartz diorite, granodiorite, monzogranite, granite porphyry, quartz diorite porphyrite and granodiorite porphyry, all of which intrude in the Cretaceous strata of the Bima Group. Owing to the intense metasomatism and hydrothermal alteration, carbonate rocks of the Bima Group form stratiform skarn and hornfels. The mineralization at the Nuri deposit is dominated by skarn, quartz vein and porphyry type. Ore minerals are chalcopyrite, pyrite, molybdenite, scheelite, bornite and tetrahedrite, etc. The oxidized orebodies contain malachite and covellite on the surface. The mineralization of the Nuri deposit is divided into skarn stage, retrograde stage, oxide stage, quartz‐polymetallic sulfide stage and quartz‐carbonate stage. Detailed petrographic observation on the fluid inclusions in garnet, scheelite and quartz from the different stages shows that there are four types of primary fluid inclusions: two‐phase aqueous inclusions, daughter mineral‐bearing multiphase inclusions, CO₂‐rich inclusions and single‐phase inclusions. The homogenization temperature of the fluid inclusions are 280°C–386°C (skarn stage), 200°C–340°C (oxide stage), 140°C–375°C (quartz‐polymetallic sulfide stage) and 160°C–280°C (quartz‐carbonate stage), showing a temperature decreasing trend from the skarn stage to the quartz‐carbonate stage. The salinity of the corresponding stages are 2.9%–49.7 wt% (NaCl) equiv., 2.1%–7.2 wt% (NaCl) equiv._, 2.6%–55.8 wt% (NaCl) equiv. and 1.2%–15.3 wt% (NaCl) equiv., respectively. The analyses of CO₂‐rich inclusions suggest that the ore‐forming pressures are 22.1 M Pa–50.4 M Pa, corresponding to the depth of 0.9 km–2.2 km. The Laser Raman spectrum of the inclusions shows the fluid compositions are dominated in H₂O, with some CO₂ and very little CH₄, N₂, etc. δD values of garnet are between ?114.4‰ and ?108.7‰ and δ¹⁸O_H2O between 5.9‰ and 6.7‰; δD of scheelite range from ?103.2‰ to ?101.29‰ and δ¹⁸O_H2O values between 2.17‰ and 4.09‰; δD of quartz between ?110.2‰ and ?92.5‰ and δ¹⁸O_H2O between ?3.5‰ and 4.3‰. The results indicate that the fluid came from a deep magmatic hydrothermal system, and the proportion of meteoric water increased during the migration of original fluid. The δ³⁴S values of sulfides, concentrated in a rage between ?0.32‰ to 2.5‰, show that the sulfur has a homogeneous source with characteristics of magmatic sulfur. The characters of fluid inclusions, combined with hydrogen‐oxygen and sulfur isotopes data, show that the ore‐forming fluids of the Nuri deposit formed by a relatively high temperature, high salinity fluid originated from magma, which mixed with low temperature, low salinity meteoric water during the evolution. The fluid flow through wall carbonate rocks resulted in the formation of layered skarn and generated CO₂ or other gases. During the reaction, the ore‐forming fluid boiled and produced fractures when the pressure exceeded the overburden pressure. Themeteoric water mixed with the ore‐forming fluid along the fractures. The boiling changed the pressure and temperature, oxygen fugacity, physical and chemical conditions of the whole mineralization system. The escape of CO₂ from the fluid by boiling resulted in scheelite precipitation. The fluid mixing and boiling reduced the solubility of metal sulfides and led the precipitation of chalcopyrite, molybdenite, pyrite and other sulfide.  相似文献   

西藏谢通门县邦弄含铁电英岩脉的地质特征及成因分析   总被引：1，自引：0，他引：1  

夏祥标  郑来林  李军敏  李再会 《矿床地质》2011,30(4):742-748

文章介绍了西藏谢通门县邦弄地区含铁电英岩脉的地质特征.电英岩脉的延伸方向大致与区内的断层平行,围岩为中粒斑状角闪黑云二长花岗岩.电英岩脉中见有不同程度的铁矿化,共有23条矿化较好的含铁电英岩脉.含铁电英岩脉中矿石矿物为赤铁矿(镜铁矿),脉石矿物为石英、电气石及少量的白云母和长石.矿石具叶片状、鳞片状结构,块状构造,矿石...  相似文献   

赣南崇义淘锡坑钨矿床氢、氧、硫同位素地球化学研究   总被引：11，自引：2，他引：9  

宋生琼  胡瑞忠  毕献武  魏文凤  石少华 《矿床地质》2011,30(1):1-10

赣南崇义县淘锡坑钨矿位于南岭东西向构造带东段与武夷山NE-NNE向构造带南段的复合部位,属于以石英脉型黑钨矿为主的钨多金属矿床.文章通过氧、氧、硫同位素地球化学特征的研究,探讨了淘锡坑钨矿成矿流体的来源及演化.研究结果显示:δD值介于-77‰～-45‰之间;石英矿物的δ18O值介于+7.3‰～+12.2‰之间,计算给出...  相似文献