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1.
广西栗木钨锡铌钽矿区流体包裹体及氢氧同位素研究 总被引：2，自引：0，他引：2
本文通过对广西栗木矿区金竹源矿床和水溪庙矿床的流体包裹体研究,得出该矿区流体包裹体主要有两相H_2O-NaCl和H_2O-NaCl-CO_2两种类型。显微测温结果表明:两相H_2O-NaCl型流体包裹体均一温度主要集中于181.9~258.8℃,盐度w(Na Cleq)主要集中于4.01%~6.87%,密度0.690~0.988 g/cm3;H_2O-NaCl-CO_2型流体包裹体均一温度为178.5~331.1℃,主要集中在两个温度段,分别为高-中温段(265.3~315.5℃)和中-低温段(202.3~264.1℃),盐度w(NaCleq)主要集中在0.21%~5.05%,密度为0.678~0.886 g/cm3。栗木矿区成矿流体有两个温度集中段,且具有低盐度、低密度的特征。氢氧同位素研究结果表明:金竹源矿床钨锡铌钽矿化花岗岩石英δD值为-73.6‰~-62.8‰,δ~(18)OV-SMOW值为7.5‰~8.9‰,计算得δ~(18)OH2O值为6.00‰~7.40‰;水溪庙矿床钨锡铌钽矿化花岗岩石英δD值为-73.8‰~-58.3‰,δ~(18)OV-SMOW值为11.0‰~13.2‰,计算得δ~(18)OH2O值为9.50‰~11.70‰,水溪庙矿床含钨锡石英脉石英δD值为-75.3‰~-56.6‰,δ~(18)OV-SMOW值为11.8‰~14.1‰,计算得δ~(18)OH2O值为2.20‰~4.50‰。栗木矿区钨锡铌钽矿化花岗岩成矿流体来源于岩浆水,含钨锡石英脉成矿流体来源于岩浆水和大气降水的混合流体。 相似文献
2.
湖南瑶岗仙钨矿稳定同位素地球化学研究 总被引：2，自引：0，他引：2
瑶岗仙矿区拥有大规模脉型钨矿和矽卡岩型钨矿,以及中型铅锌矿床。石英脉型钨矿床脉体中的多阶段性、空间分带性均不明显,围岩蚀变规模小。矽卡岩型钨矿床蚀变规模大,多阶段,成矿温度跨度大,分带明显。石英脉型钨矿床硫化物δ34S=-2.6~3.9‰,平均-0.35‰,范围集中于0值附近,塔式分布;δ18O＝12.4‰~14.4‰,δD=-60‰~-54‰,δ18O值、δD值集中,变化范围很小。矽卡岩矿床δ34S=-1.3~3.6‰,平均0.99‰,略高于石英脉型钨矿床;石英δ18O＝1.5‰~11.7‰（杮竹园数据）,变化范围大。铅锌矿床δ34S=-2.9~1.4‰,平均-0.8‰,略低于钨矿;石英δ18O＝12.1‰~15.4‰,δD=43‰~51‰,变化范围更大。石英脉型、矽卡岩型钨矿和铅锌矿铅同位素组成范围相似,206Pb/204Pb=18.548~18.701,207Pb/204Pb=15.691~15.811,206Pb/204Pb=38.809~39.212。地质和S、Pb、H、O同位素研究说明,瑶岗仙矿区脉型钨矿与矽卡岩型钨矿床含不同的稳定同位素,显示成矿物质和成矿流体来源的差异性,成矿过程也不相同。脉型矿床成矿物质和成矿流体具体较单一的岩浆来源,没有明显的大气降水参与;而矽卡岩型矿床成矿物质主要来自于岩浆,也有沉积岩围岩的贡献,早阶段成矿流体来自于岩浆,中晚阶段有大量的大气降水参与成矿。与矽卡岩型钨矿床相比,脉型矿床成矿作用具有较低的水/岩比值。铅锌矿的地质地球化学特征更加相似于矽卡岩外围的分带形成的铅锌矿,即铅锌矿化属于矽卡岩演化至硫化物阶段的成果,而与石英脉型钨矿床无明显关系。 相似文献
3.
湖南柿竹园钨锡多金属矿田野鸡尾矿床同位素地球化学研究 总被引：4，自引：3，他引：4
湖南柿竹园钨锡多金属矿田野鸡尾矿床产于千里山花岗岩岩体东南缘与泥盆系中统棋梓桥组和泥盆系上统佘田桥组灰岩接触带附近。是一个富含钨、锡、铅锌等多种金属的矽卡岩-云英岩-硫化物复合型矿床,在空间上具有明显的分带现象。研究表明,该矿床中花岗岩造岩矿物的ε~(18)O 值在-1.7‰～ 12.1‰之间,其中石英的δ~(18)O 值较高,变化范围为8.4‰～12.1‰,钾长石为3.8‰～8.6‰,黑云母为-1.7‰～-1.4‰。石英-钾长石和钾长石-黑云母矿物对的氧同位素平衡温度为350℃～630℃,低于一般花岗岩的结晶温度。石英包裹体的δD为-56‰～-62‰,位于正常岩浆水的范围之内。矽卡岩期流体的δ~(18)OH_2O 为8.2‰～9.2‰,δD为-100‰～-156‰;云英岩流体的δ~(18)O_(H_2O)为4.9‰～6.7%e,δD为-69‰;硫化物期流体的δ~(18)O_(H_2O)为2.5‰～-36.1‰,δD为-54‰;晚期石英脉流体的δ~(18)O_(H_2O)为-7.3‰,δD为-58‰。从矽卡岩到晚期石英脉,成矿流体的氢氧同位素组成具有独特的演化特征,可以用沸腾去气作用和岩浆水与雨水混合作用来解释。矿区围岩灰岩和大理岩的占δ~(18)O_(SMOW)值为4.2‰～20.0‰,δ~(13)C_(PDB)为-6.0‰～0.3‰,灰岩与大理岩的δ~(18)O 和δ~(13)C 显著不同,用矿化和蚀变过程中水-岩相互作用和同位素交换反应可以圆满地解释。矿床硫化物的δ~(34)S 值为 2.8‰～ 8.9‰,其中矽卡岩硫化物的δ~(34)S 在 2.8‰～ 8.9‰之间;云英岩中硫化物δ~(34)S 在 3.4‰～ 6.9‰之间;硫化物阶段的δ~(34)S 在 3.7‰～ 6.3‰之间。估算的成矿流体总硫δ~(34)S_(∑S)约为3‰,表明硫的主要来源可能来自千里山花岗岩岩浆。综合氢氧碳硫同位素组成研究,本文认为野鸡尾矿床成矿物质主要来自千里山花岗岩,也可能有少部分物质来源于围岩沉积岩。 相似文献
4.
在前人研究成果的基础上,对江西新余良山钼矿床的地质特征进行了详细研究,系统测试了矿床中石英脉型钼矿石样品的氢、氧、硫和铅同位素组成,进而探讨钼矿床的成矿流体性质以及成矿物质来源。良山钼矿床δD值变化范围-61‰~ -57.9‰,平均值-59.1‰;δ18OV-SMOW值变化于7.1‰~10.5‰,平均值9.2‰,流体的δ18OH2O值变化于-3.32‰~-0.52‰,平均值-1.52‰,表明成矿流体具有岩浆水和大气降水混合流体特征。硫化物的δ34SV-CDT值为-1.8‰~2.6‰,极差4.4‰,平均值1.12‰,其中黄铁矿δ34SV-CDT值为-1.8‰~2.6‰,辉钼矿δ34SV-CDT值为0.8‰~2.3‰,硫同位素表现为较小的正值特征,具有典型的岩浆硫组成特点。良山钼矿石中的矿石铅同位素206Pb/204Pb值为17.555~19.474,207Pb/204Pb值15.486~15.768,208Pb/204Pb值37.942~39.943,μ值9.35~9.7,ω值37.06~38.31,Th/U值3.8~3.96,矿石铅为混合铅,表明成矿物质为混合来源。良山钼矿床应为岩浆热液型-石英脉型钼矿床,是中生代华南板块板内构造演化区域金属成矿作用大爆发的产物。 相似文献
5.
大坞尖钨矿床位于扬子陆块南缘与华夏古陆块的接合部位,是皖南地区典型的层控矽卡岩型矿床,近年来在该区域内钨多金属矿的找矿取得很大的突破。成矿流体及成矿物质来源的确定对矿床成因研究、找矿方向及区域成矿规律认识具有重要意义。文章对主成矿期的石英和黄铁矿进行了氢、氧和硫同位素测试。数据显示,主成矿期石英的流体包裹体中水的δD_(SMOW)值为-98.2‰~-70.1‰,δ18O_(SMOW)值为11.5‰~13.9‰之间,成矿流体主要来自岩浆水,有大气降水的混合;黄铁矿的δ34SV-CDT值为4.6‰~5.2‰,硫源单一,主要为岩浆来源,可能有少量地层S混入。矿床氢、氧和硫稳定同位素研究表明,燕山期大钨尖地区大规模的构造-岩浆活动不仅带来了大量的成矿物质,而且使地层中的成矿物质活化迁移,并在有利的构造部位沉淀富集,从而形成钨多金属矿床。 相似文献
6.
甲岗雪山钨钼矿床位于西藏自治区申扎县境内,是西藏首例云英岩型钨矿床,关于该矿床的研究对探讨区域成矿机制和指导找矿都具有重要意义.成矿作用与矿区内的二长花岗岩紧密相关,矿体主要产于岩体内部和紧邻岩体的围岩中.矿体的类型包括云英岩型和石英脉型,矿石多呈细脉状或者浸染状产在云英岩或云英岩化二长花岗岩体内部,少量呈大脉状产于围岩地层中.为了研究该矿床成矿流体及成矿物质的来源,挑选云英岩型矿体和石英脉型矿体中的黑钨矿、石英进行H、O同位素测试,挑选金属硫化物进行S、Pb同位素测试.结果显示,黑钨矿δ18OV-SMOW(‰)值集中在3.7~4.7;石英的δ18O水值为2.0‰~4.3‰,δD值为-131‰^-84‰,表明成矿流体主要来源于脱气后的岩浆水,可能混入了极少量大气降水.矿石硫化物δ34S的值为+2.2‰^+5.3‰,表明硫来自岩浆;硫化物的206Pb/204Pb、207Pb/204Pb、208Pb/204Pb值分别为18.582 2~18.797 1、15.671 7~15.760 6、39.462 5~39.501 2,进一步表明成矿物质铅主要来源于中拉萨地体前寒武纪变质基底部分熔融产生的岩浆,可能有少量来自围岩地层. 相似文献
7.
8.
《矿物学报》2017,(6)
滇西腾冲-梁河锡矿带是三江特提斯成矿域重要的锡多金属成矿区,目前已发现具有代表性的大型锡矿床2个:古近纪的梁河来利山锡矿床和晚白垩纪的腾冲小龙河锡矿床。对这2个矿床主成矿阶段形成的黄铁矿样品进行了硫同位素测定,结果表明来利山锡矿床黄铁矿的δ~(34)SCDT值为+4.9‰~+6.7‰,平均值+5.5‰(n=10);小龙河锡矿床δ~(34)SCDT值为+5.0‰~+8.1‰,平均值+6.3‰(n=32)。两个锡矿床的δ~(34)SCDT值与矿区花岗岩的δ~(34)SCDT值(0~+5.7‰)范围基本一致,暗示这2个矿床的成矿流体中的硫均主要来自花岗岩浆。结合已有研究资料,认为腾冲-梁河锡矿带这两个典型锡矿床与矿区花岗岩具有同时性,其成矿流体均主要源自各矿区花岗岩浆的分异演化,花岗岩浆还为锡矿化提供了部分Sn成矿物质,小龙河和来利山锡矿床的锡成矿作用与花岗岩浆活动具有密切的联系,属于花岗岩岩浆热液矿床。 相似文献
9.
大湖塘石门寺钨矿床碳、氧、硫同位素研究 总被引：1，自引：0，他引：1
石门寺钨矿是大湖塘钨矿床的北矿段,位于我国下扬子成矿省之江南隆起东段成矿带西部,钦杭结合带的北侧。针对此细脉浸染型钨矿体中金属硫化物中的硫同位素和方解石中的碳、氧同位素进行了测定,结果显示细脉浸染型矿体中黄铜矿样品的δ34S值介于-2.6‰~-0.3‰之间,平均值为-1.31‰;辉钼矿样品的δ34S值介于-1.2‰~0.3‰之间,平均值为-0.53‰。矿体的硫主要来至深部岩浆或者上地幔。方解石δ13 CV-PDB值介于-11.42‰~-5.76‰之间,平均值为-7.06‰;δ18 OV-SMOW的变化范围为7.13‰~16.34‰,平均值为11.79‰,说明成矿流体中的碳主要来源于深部岩浆或者上地幔,并受到有机碳的混合。大湖塘石门寺钨矿段的成矿物质主要来源于大湖塘燕山期S型花岗岩岩浆,但不排除成矿流体在上升的过程中萃取了一部分围岩的成矿物质。 相似文献
10.
盘古山钨矿是江西南部重要的黑钨矿-辉铋矿石英脉型矿床之一,对该矿床主成矿期形成的5件石英样品进行了氢氧同位素测定,结果显示,δ18O值变化范围为11.35%~13.33‰,δD变化于-65%~-58%之间,计算后得到的成矿流体的δ18O值变化范围为3.96%~5.94‰。据此判断,盘古山钨矿的成矿流体在主成矿阶段主要由岩浆水构成,结合前人的研究成果,进一步分析认为石英脉型钨矿主成矿阶段主要为岩浆流体,而大气降水的兑入则可能多发生于晚成矿阶段。 相似文献
11.
Emily Keeble David I. Whiteside Michael J. Benton 《Proceedings of the Geologists' Association. Geologists' Association》2018,129(2):99-119
Pant-y-ffynnon Quarry in South Wales yielded a rich cache of fossils in the early 1950s, including articulated specimens of new species (the small sauropodomorph dinosaur Pantydraco caducus and the crocodylomorph Terrestrisuchus gracilis), but no substantial study of the wider fauna of the Pant-y-ffynnon fissure systems has been published. Here, our overview of existing specimens, a few described but mostly undescribed, as well as freshly processed material, provides a comprehensive picture of the Pant-y-ffynnon palaeo-island of the Late Triassic. This was an island with a relatively impoverished fauna dominated by small clevosaurs (rhynchocephalians), including a new species, Clevosaurus cambrica, described here from a partially articulated specimen and isolated bones. The new species has a dental morphology that is intermediate between the Late Triassic Clevosaurus hudsoni, from Cromhall Quarry to the east, and the younger C. convallis from Pant Quarry to the west, suggesting adaptive radiation of clevosaurs in the palaeo-archipelago. The larger reptiles on the palaeo-island do not exceed 1.5?m in length, including a small carnivorous crocodylomorph, Terrestrisuchus, and a possible example of insular dwarfism in the basal dinosaur Pantydraco. 相似文献
12.
Gilles Serge Odin 《Comptes Rendus Geoscience》2002,334(6):409-414
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
13.
The effect of water on accessory phase solubility in subaluminous and peralkaline granitic melts 总被引：4，自引：0，他引：4
The solubilities of columbite, tantalite, wolframite, rutile, zircon and hafnon were determined as a function of the water contents in peralkaline and subaluminous granite melts. All experiments were conducted at 1035 °C and 2 kbar and the water contents of the melts ranged from nominally dry to approximately 6 wt.% H2O. Accessory phase solubilities are not affected by the water content of the peralkaline melt. By contrast, solubilities are affected by the water content of the subaluminous melt, where the solubilities of all the accessory phases examined increase with the water content of the melt, up to 2 wt.% H2O. At higher water contents, solubilities are nearly constant. It can be concluded that water is not an important control of accessory phase solubility, although the water content will affect diffusivities of components in the melt, thus whether or not accessory phases will be present as restite material. The solubility behaviour in the subaluminous and peralkaline melts supports previous spectroscopic studies, which have observed differences in the coordination of high field strength elements in dry vs. wet subaluminous granitic glasses, but not for peralkaline granitic glasses. Lastly, the fact that wolframite solubility increases with increasing water content in the subaluminous melt suggests that tungsten dissolved as a hexavalent species. 相似文献
14.
15.
Muriel Rocher Stéphane Baize Stéphane Jaillet Edward Marc Cushing Yannick Lozac&#x;h Francis Lemeille 《Comptes Rendus Geoscience》2003,335(8):701-708
Calcite samples were extracted both from the rock matrix and the superficial coating of a karstified fault plane of an underground quarry, located in the eastern border of the Paris basin. The karstification is dated as Quaternary. Analysis of mechanical calcite twinning reveals that only the calcite matrix has also undergone a compression trending WNW that can be attributed to the Mio-Pliocene alpine collision. Both coating and matrix have undergone a strike-slip regime with σ1 roughly trending north–south, that could correspond to the regional present-day state of stress, a strike-slip compression rather trending NNW, modified by local phenomena. To cite this article: M. Rocher et al., C. R. Geoscience 335 (2003). 相似文献
16.
正20141520 Bo Ying(Key Laboratory of Metallogeny and Mineral Assessment,MLR,Beijing 100037,China);Liu Chenglin Saline Spring Hydrochemical Characteristics and Indicators for Potassium Exploration in Southwestern and Northern Tarim Basin,Xinjiang(Acta Geoscientica Sinica,ISSN1006-3021,CN11-3474/P,34(5),2013,p.594-602,5 illus.,3 tables,28 refs.) 相似文献
17.
正20141243Chen Ge(Hangzhou Research Institute of Petroleum Geology,PetroChina,Hangzhou 310023,China);Si Chunsong Study on Sedimentary Numerical Simulation Method of Fan Delta Sand Body(Journal of Geology, 相似文献
18.
正20142599Chen Sanming(Guangxi Key Laboratory of Concealed Deposits Exploration,Guilin University of Technology,Guilin541004,China);He Yuzhou Block Model and Reserves Estimation of Panzhihua Iron Deposit Based on 3D Geological Modeling(Journal of Guilin University of Technology,ISSN1674-9057,CN45-1375/N,33(4),2013,p.610-615,9illus.,1table,15refs.) 相似文献
19.
正20140594 Bai Daoyuan(Hunan Institute of Geology Survey,Changsha 410016,China);Zhong Xiang Faults in the Jingzhou Basin and Their Tectonic Settings(Geotectonica et Metallogenia,ISSN1001-1552,CN44-1595/P,37(2),2013,p.173-183,6illus.,59refs.)Key words:basin evolution,tectonic setting,South China In the Upper Paleozoic and Jurassic se- 相似文献
20.
正20141912Cao Hui(State Key Laboratory for Continental Tectonics and Dynamics,Institute of Geology,Chinese Academy of Geological Sciences,Beijing 100037,China)Gravitational Collapse and Folding during Orogenesis:A Comparative Study of FIA Trends and Fold Axial Plane Traces(Geology in China,ISSN1000-3657,CN11-1167/P,40(6),2013,p.1818-1828,9illus.,35refs.,with 相似文献