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《地球科学与环境学报》2020,(5)
灵湖金矿床位于华北克拉通南缘的小秦岭地区,矿体大多呈脉状产于断裂带内。成矿过程可初步划分为石英-黄铁矿、石英-多金属硫化物和石英-碳酸盐-黄铁矿3个阶段。Au主要沉淀于石英-多金属硫化物阶段。成矿期石英中发育富液两相、富气两相和H_2O-CO_2三相包裹体。石英-黄铁矿阶段发育富液两相包裹体,其完全均一温度为424℃～499℃,盐度为11.5%～13.6%NaCl_(eq),密度为0.55～0.66 g·cm~(-3);石英-多金属硫化物阶段发育富气两相、富液两相和H_2O-CO_2三相包裹体,其完全均一温度为291℃～389℃,盐度为0.4%～11.8%NaCl_(eq),密度为0.50～0.83 g·cm~(-3);石英-碳酸盐-黄铁矿阶段可见富液两相和富气两相包裹体,其完全均一温度为206℃～289℃,盐度为8.3%～22.2%NaCl_(eq),密度为0.83～0.99 g·cm~(-3)。成矿流体具有高温、中低盐度和低密度等特征。灵湖金矿床中石英的δ~(18)O_(H_2O)值为0.7‰～4.5‰,δD值为-106.4‰～-86.1‰。H-O同位素分析结果表明,成矿流体主要来源于岩浆水。矿石硫化物的δ~(34)S值为-8.5‰～2.4‰,~(206)Pb/~(204)Pb值为17.202～17.796,~(207)Pb/~(204)Pb值为15.448～15.473,~(208)Pb/~(204)Pb值为37.712～38.255。S-Pb同位素分析结果表明,成矿物质主要来源于低级下地壳部分熔融形成的花岗质岩浆。灵湖金矿床为岩浆热液型金矿,流体相分离和温度的降低是导致矿质沉淀的主要机制。 相似文献
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马家窑金矿位于胶东栖蓬福金成矿带盘马金矿田东部,本文针对该矿床主要成矿阶段典型矿石开展了流体包裹体及S同位素分析测试。研究表明,矿石中流体包裹体以纯液包裹体与富液体包裹体为主,局部发育富气体包裹体和H2OCO2三相包裹体,可见少量含子矿物富液体包裹体。包裹体均一温度集中于220～280℃,石英流体包裹体盐度（w（NaCl））集中于4.60%～8.60%,白云石流体包裹体盐度（w（NaCl））集中于5.14%～5.33%,流体密度集中于0.80～1.02g/cm3,估算成矿压力为200～285MPa,成矿深度约6.8～9.7km。矿石中黄铁矿δ34S值总体为5.3‰～15.9‰。成矿流体为中温、低密度、低盐度流体,具壳幔混合来源特征,矿床属中温中成热液矿床。 相似文献
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华北地台北缘与金矿床有关的花岗岩类以贫D为特征,由其衍生的岩浆水δD=—120‰——85‰,δ~(18)O=5.0‰—8.0‰。H,O同位素研究表明,太古宙绿岩建造金矿床成矿流体为地壳深处多源混合水,以δD,δ~(18)O十分稳定为特征;显生宙花岗岩建造金矿床成矿流体为与金铜系列花岗岩再平衡的岩浆水;火山岩建造金矿床成矿流体为大气降水与岩浆水的混合产物,以δ~(18)O的明显漂移为特征;古生代绿岩建造金矿床的成矿流体为被花岗岩侵入体加热的大气降水,以δD特别低为特征。 相似文献
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五凤金矿床是位于延边地区的浅成低温热液金矿床。矿脉的产出受不同方向断裂构造控制,主要分布于碱长花岗岩、角闪安山岩等侵入体及地层之中。研究表明,热液金矿化可分为石英--冰长石-方解石阶段,石英--方解石①阶段,石英-方解石②阶段及方解石阶段4个阶段。流体包裹体研究表明,研究区主成矿阶段石英中主要发育气液两相流体包裹体;其均一温度范围为129.8℃～236.5℃,峰值区间为190℃～220℃,盐度w （ NaCl ）为0.83％～1.98％。成矿流体为低温、低盐度的NaCl-H2 O体系热液。氢氧同位素研究结果表明,五凤金矿床成矿流体为岩浆热液与大气降水的混合流体,矿床属浅成低温热液成因类型。 相似文献
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为确定农坪金铜矿床的成矿流体特征及矿床形成机制,采集细脉浸染状金铜矿石中的石英-硫化物细脉,对石英颗粒中的流体包裹体进行了岩相学、显微测温和激光拉曼光谱分析。结果表明：脉石英中主要发育Ⅰ型气液两相、Ⅱ型含CO2三相、Ⅲ型含子矿物多相、Ⅳ型纯气相和Ⅴ型纯液相等5种类型的原生流体包裹体。不同类型包裹体的均一温度变化范围为237.8℃～399.4℃,主要集中于310℃～370℃,盐度w （ NaCl ）变化范围于1.39％～12.3％和33.32％～42.03％两个区间。代表性包裹体的激光拉曼光谱分析结果显示,成矿流体主要气相成分为H2 O、 CO2,并含有少量的CH4。综合研究后认为,农坪矿床成矿流体曾发生过沸腾作用,以至流体中的H2 O、 CO2等挥发组分大量逸出,引起金、铜等有用组分的沉淀富集。农坪金铜矿床与小西南岔金铜矿床在成矿条件及矿化特征等方面具有相似性,二者同为斑岩型金铜矿床,均属燕山晚期构造岩浆作用的产物。 相似文献
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戴里铅锌矿集区位于印度尼西亚苏门答腊岛西北部,是一个主要产于页岩、具有巨型规模的Sedex型铅锌矿。通过系统的流体包裹体测试及H、O、S、Pb等同位素分析,以对其成因进行约束。分析结果表明:①戴里铅锌矿流体包裹体均一温度范围为189~315℃,峰值为220~240℃;②δDV-SMOW值范围为-68.7‰~-76.4‰,平均为-72.9‰,δ18OV-SMOW值范围为+5.9‰~+19.5‰,平均为+16.6‰;③黄铁矿δ34SCDT值为正值,集中分布在+25.49‰~+26.36‰之间;④铅同位素显示较高的μ值（9.92~10.17,平均值为10.04）和ω值（38.06~40.51,平均值为39.26）。该矿床成矿流体温度为中温（220~240℃）,成矿流体可能以岩浆水为主,有少量浅源水的加入,硫、铅均为单一来源,其中硫主要来自海水,铅来源于上地壳。 相似文献
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《地球科学与环境学报》2019,(6)
库茹尔铜金矿床位于新疆西天山晚古生代伊什基里克裂谷带,赋矿围岩为下石炭统大哈拉军山组安山质岩屑凝灰岩,矿体受一系列断裂构造控制。有关该矿床的成矿流体特征研究不足,限制了对矿床成因的认识。以该矿床的地质特征、流体包裹体为主要研究对象,探讨了成矿流体性质、来源及演化规律,初步查明了矿床成因类型。库茹尔铜金矿床热液成矿过程可划分为石英-黄铜矿-黄铁矿-自然金阶段、石英-黄铜矿阶段和石英-绿泥石/绿帘石-方解石阶段。流体包裹体研究表明:主成矿阶段(石英-黄铜矿-黄铁矿-自然金阶段)以气液水两相包裹体为主,含少量CO_2-H_2O三相包裹体与含石盐子晶多相包裹体,均一温度分别为184℃～359℃、250℃～319℃和229℃～263℃,盐度分别为4.1%～8.5%NaCl_(eq)、1.0%～6.0%NaCl_(eq)和32.7%～33.9%NaCl_(eq);石英-黄铜矿阶段和石英-绿泥石/绿帘石-方解石阶段均以气液水两相包裹体为主,均一温度分别为144℃～212℃和114℃～163℃,盐度分别为0.2%～6.7%NaCl_(eq)和0.1%～3.1%NaCl_(eq)。库茹尔铜金矿床的初始成矿流体具中—高温、中—低和高盐度的岩浆热液特征,流体不混溶是导致Au-Cu富集成矿的主要机制,矿床成因类型应属于与斑岩成矿系统相关的次浅成低温热液矿床。 相似文献
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造山型金矿床与造山事件在时间和空间上具有十分密切的联系,对造山型金矿床的主要成矿时期、在世界和中国的分布规律、矿床地球化学特征以及成矿模型进行了总结.造山型金矿床成矿时间与大陆地壳生长过程中产生的热事件对应,主要形成于陆缘增生造山带,少量形成于陆－陆碰撞造山带.造山型金矿床的成矿流体具有低盐度(６％~１２％)、富 CO２(１０％~５０％)的特征,可以与其他类型的金矿床进行区分.就地球化学特征而言,不同时代不同地区差别较大,如太古宙与元古宙造山型金矿床成矿流体的δ１８O 值集中在６‰~１１‰、δ１３C值变化范围为０~－１０‰,而显生宙造山型金矿床δ１８O 值为７‰~１３‰、δ１３C值为０~－１０‰;太古宙造山型金矿床中硫化物的δ３４S值集中在０~９‰之间,而显生宙造山型金矿床则集中于０~１０‰之间;各时代造山型金矿床成矿流体均相对富集 D同位素,δD值集中于－８０‰~－２０‰之间.Pb和Sr同位素虽然在示踪物质来源方面研究进展较大,但是仍不能很好地指示造山型金矿床成矿物质的来源.随着研究的不断深入,地壳连续模式、变质脱挥发分模式、断层阀模式以及盆地尺度两阶段模式等成因模式先后被提出,用于描述造山型金矿床的形成过程,但关于造山型金矿床的成矿模式仍存在较大争议. 相似文献
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洒西钨铍矿床位于滇东南老君山钨锡多金属成矿区。确定早期似层状矿体和晚期脉状矿体的流体性质、来源和演化过程, 并对其流体地球化学和同位素进行约束, 可以有效探讨洒西钨铍矿床成矿机制, 为老君山矿集区下一步找矿工作提供理论思考。洒西钨铍矿床脉状矿体的形成经历了硅酸盐阶段、氧化物-硫化物阶段和碳酸盐-萤石阶段, 白钨矿和绿柱石主要形成于前两阶段。对洒西钨铍矿床脉状矿体不同阶段石英中的流体包裹体进行了岩相学特征、显微测温、激光拉曼光谱分析等研究, 并对早期似层状矿体和晚期脉状矿体矿石中石英的氢-氧同位素组成进行了测试。结果表明: 该矿床内脉状矿体的流体包裹体主要有富液相包裹体、富气相包裹体和含子矿物多相包裹体3种类型。流体包裹体的气相成分以H2O主, 含少量还原性气体如C2H2等, 液相成分也以H2O为主。从硅酸盐阶段到碳酸盐-萤石阶段, 包裹体的均一温度和盐度(NaCleq)峰值范围分别为240~360℃、2.35%~13.81%;220~310℃、4.03%~9.86%和190~270℃、2.41%~6.88%。从硅酸盐阶段到碳酸盐-萤石阶段, 成矿流体的温度呈现降低趋势, 盐度也呈降低趋势。成矿流体总体上属中-高温度、低盐度、贫CO2、含部分还原性气体的NaCl-H2O流体体系。早期似层状矿体石英样品δ DV-SMOW值变化范围小, 为-102.8‰~-99.0‰, δ 18OV-SMOW值为11.7‰~13.0‰, δ 18OH2O值为3.16‰~6.46‰; 晚期脉状矿体氧化物-硫化物阶段石英样品δ DV-SMOW值变化范围较大, 为-99.6‰~-69.5‰, δ 18OV-SMOW值为11.2‰~14.1‰, δ 18OH2O值为3.08‰~6.73‰。综合表明成矿流体主要是岩浆水, 混合有少量大气降水或有机水, 流体可能发生了沸腾作用, 加之温度的降低, 导致晚期脉状矿体氧化物-硫化物阶段主要成矿物质的沉淀。洒西钨铍矿床属于中高温热液矿床。 相似文献
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The ability of cell to modulate the fluidity of plasma membrane was crucial to the survival of microorganism at low temperature. Plasma membrane proteins, fatty acids and carotenoids profiles of Antarctic psychrophilc yeast Rhodotorula sp. NJ298 were investigated at -3 ℃, 0 ℃ and 8 ℃. The results showed that plasma membrane protein content was greater at -3 ℃ than that at 8 ℃, and a unique membrane polypeptide composition with an apparent molecular mass of 94.7 kDa was newly synthesized with SDS-PAGE analysis; GC analysis showed that the main changes of fatty acids were the percentage of unsaturated fatty acids (C18∶ 1 and C18∶ 2) and shorter chain saturated fatty acid (C10∶ 0) increased along with the decrease of the culture temperature from 8 ℃ to -3 ℃; HPLC analysis indicated that astaxanthin was the major functional carotenoids of the plasma membrane, percentage of which increased from 54.6±1.5% at 8 ℃ to 81.9±2.1% at -3 ℃. However the fluidity of plasma membrane which was determined by measuring fluorescence anisotropy was similar at -3 ℃, 0 ℃ and 8 ℃. Hence these changes in plasma membrane's characteristics were involved in the cellular cold-adaptation by which NJ298 could maintain normal plasma membrane fluidity at near-freezing temperature. 相似文献
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《极地研究(英文版)》2014,(4)
正1 Aims and Scope Advances in Polar Science(APS)is an international,peer-reviewed journal jointly sponsored by the Polar Research Institute of China and the Chinese Arctic and Antarctic Administration.APS is a comprehensive academic journal dedicated to presentation of multi-disciplinary achievements in Arctic and Antarctic expeditions and research.Its primary purpose 相似文献
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《中国海洋大学学报(英文版)》2014,(4)
<正>Copyright Submfnion of a roanusatpt inks:that the work described has not been published before(exoept In the form of an abstrW or as part of a published lecture,review,or thesis);that it is not under consideration for publication elsewhere that its publication has been approved by ail 相似文献
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《中国海洋大学学报(英文版)》2014,(6)
<正>The Journal of Ocean University of China(Oceanic and Coastal Sea Research)is a comprehensive academic quarterly sponsored by the Ocean University of China,published one volume per year.This journal is devoted to the publication of the theoretical and applied research results on oceanography and marine fisheries.The fieldcovered include the physical,chemical,biological,geo- 相似文献
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Massimo GRECO 《山地科学学报》2014,(6):1383-1384
<正>The 35th IAHR World Congress was held in Chengdu,China from September 8 to September 132013.The title of the conference was:"The Wise Finds Pleasure in Water:Meandering through Water Science and Engineering".During the congress,1239 papers were presented in 139sessions for oral presentations and 7 sessions for poster presentations.After the Congress,a Committee was appointed to select some of the best papers presented at the Congress for publication,after a 相似文献
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As an important component of the cryosphere,sea ice is very sensitive to the climate change.The study of the sea ice physics needs accurate sea ice thickness.This paper presents an electromagnetic-induction(EM) technique which can be used to measure the sea ice thickness distribution efficiently,and the successful application in Bothnian Bay.Based on the electromagnetic field theory and the electrical properties of sea ice and seawater,EM technique can detect the distance between the instrument and the ice/water interface accurately,than the sea ice thickness is obtained.Contrastive analysis of the apparent conductivity data obtained by EM and the value of drill-hole at same positions allows a construction of a transformable formula of the apparent conductivity to sea ice thickness.The verification of the sea ice thickness calculated by this formula indicates that EM technique is able to get reliable sea ice thickness with average relative error of only 12%.The statistic of all ice thickness profiles shows that the level ice distribution in Bothnian Bay was 0.4-0.6 m. 相似文献
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Based on the hydrographic data in austral summer during the 22nd Antarctic Expedition of China(2005/2006),some features can be found about the northern margin of Emery ice shelf as follows.The heat content in the surface layer(0-50 m) at the eastern end and the western end of the ice-shelf margin is much higher than that at the middle.The upper mixing-layer depth and the seasonal thermocline depth at the middle of the ice-shelf northern margin are much shallower than those at the both ends.However there is much less difference between the middle and the ends in the bottom layer.The remote sensing photos show that the inhomogeneity in the surface-layer water is closely related to the spatial distribution of the floes and polynia in the area. 相似文献
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Phylogenetic analysis based on 16S rDNA of 8 strains of cultivable bacteria isolated from Arctic sea-ice was studied.The results showed that strain BJ1 belonged to genus Planococcus,which was a genus of low mole percent G C gram-positive bacteria;strain BJ6 belonged to genus Burkholderia of β-proteobacteria and the rest 6 strain all belonged to γ-proteobacteria,of which strain BJ8 was a species of Pseudoalteromonas,strain BJ2-BJ5 and BJ7 were members of genus Psychrobacter.Phylogenetic analysis also indicated that bacteria of genus Psychrobacter of the isolates formed a relatively independent phylogenetic cluster in comparison with other bacteria belonged to genus Psychrobacter. 相似文献
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正Rapid changes of Arctic sea ice cover have been in the focus of the international climate research community in recent years.Quite a few of nations have completed a large number of related surveys and research projects in the Arctic Ocean.Up to now,China has performed six research cruises to the Arctic Ocean resulting in a significant volume of research output.Improved knowledge on the atmospheree-sea ice-ocean interactions in the Arctic is a 相似文献