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1.
南极乔治王岛中——新生代岩浆岩Sr—Nd—Pb同位素组成及源区特征 总被引:7,自引:1,他引:7
对乔治王岛11个火山岩和2个侵入岩样品做了Sr-Nd-Pb同位素分析,其中(87Sr/86Sr)i=0.70326~0.70392,εNd=3.02~6.72,206Pb/204Pb=17.776~18.515,207Pb/204Pb=15..506~15.571,208Pb/204Pb=37.868~38.308。根据以上同位素组成及其相互关系并结合岩石学和微量元素特征及火山岩中熔融包裹体成分,得出以下结论:(1)研究的乔治王岛岩浆岩起源于亏损地幔(DMM)和地幔流体交代成因的富集地幔EMI混合形成的源区;(2)该源区具有广义Dupal异常,它正是由于EMI组份加入即通过流体交代作用而产生的;(3)流体主要是俯冲深海沉积物脱碳酸盐作用而释放出的富CO2流体。 相似文献
2.
冀西北水泉沟正长岩杂岩体的成因 总被引:11,自引:5,他引:11
水泉沟碱性正长岩杂岩体侵入于太古宇桑干群变质岩中,岩体主要由碱性长石正长岩、角闪碱长正长岩、正长岩、石英碱长正长岩等组成,属碱性岩系列,在岩石的石英颗粒中见有熔融包体的存在。岩石的稀土元素分布模式呈平滑的右倾模式,无明显的铕异常。岩石的Pb同位素组成为206Pb/204Pb=16.457~18.286、207Pb/204Pb=15.270~15.472、208Pb/204Pb=36.539~37.393,石英的δ18O值为8.0‰~8.5‰,(87Sr/86Sr)i≈0.705,岩石的tDM为1.6~1.9Ga,εNd(t)为-7.45~-13.1,明显大于区域基底的εNd(t)值(-20±)。以上结果表明,岩体为上地幔和下地壳物质部分熔融的产物。岩体角闪石39Ar-40Ar年龄327Ma,为海西期岩浆作用的产物 相似文献
3.
南极罗斯岛及泰勒谷地区火山岩的地球化学特征及成因讨论 总被引:2,自引:0,他引:2
利用微量元素和Sr,Nd,Pb同位素资料,得出了南极罗斯岛及泰勒谷地区火山岩来自于上地幔,五个地区火山岩具有相同的源区。岩石具有大洋岛屿玄武岩(OIB)的特征。来自地幔的火山喷发的岩浆未遭受地壳物质的混染作用。地幔源区是具有高μ(=206Pb/204Pb)比值的地幔组分HIMU与亏损地幔组分DMM混合作用的结果,其中以HIMU组分为主,原生岩浆由具HIMU组分特征的深部地幔柱与浅部的DMM混合而成。 相似文献
4.
一个造山后的辉长岩—河南新县王母观岩体的地球化学特征 总被引:17,自引:1,他引:17
河南新县王母观辉长岩(261Ma)侵位在定远组(391Ma)中。岩体贫K、Zr、Y、Ta、Th、Hf,LREE略亏损,具明显的Eu正异常,εNd(t)较低(+3--1.0),εSr(t)低(-5--8),δ^18O在地幔范围内(+5.6‰-+6.4‰)。Nd-Sr同位素关系暗示岩体源于大陆下略亏损的地幔源区,推测为亏损地幔端元(DMM)与第一类富集地幔端元(EMI)混合的产物。矿物、微量元素和同位 相似文献
5.
青藏高原岩石圈演化的记录:藏北超钾质及钠质火山岩的岩石学与地球化学特征 总被引:56,自引:12,他引:44
藏北鱼鳞山超钾质火山岩为一中等规模的熔岩被, 可分为三期。前两期主要为霞石黝方白榴石响岩、霞石白榴斑岩等, 后期主要为方钠石霓石粗面岩、霓霞粗面岩等。时代为18~30 Ma。本区超钾质岩浆 Si O2 强烈不饱和、强碱性、高度富集 L R E E及 L I L E、放射成因 Sr、 Pb 及非放射成因 Nd 同位素 (86 Sr/87 Sr= 0708766~0709162, 206 Pb/204 Pb= 18882888~ 19104751, 207 Pb/204 Pb= 15642037 ~ 15828458, 208 Pb/204 Pb= 39138921 ~ 39686835 及143 Nd/144 Nd= 0512116 ~0512342),其上述特征指示岩浆源区为受到地壳物质强烈交代的富集 E M I I型地幔。藏北拉嘎拉钠质碱性橄榄玄武岩为高原面上的剥蚀残丘, 时代为60 Ma。其岩石学、 R E E、微量元素及 Sr Nd Pb 同位素指示了岩浆源区为受到洋壳俯冲物质交代的轻度富集地幔。本研究结果指示, 羌塘高原南部富集地幔的形成可能是受到印度板块俯冲的影响。 相似文献
6.
北秦岭晚古生代—中生代花岗岩类的Nd.Sr.Pb同位素地球化学特征及Nd.Sr 总被引:1,自引:0,他引:1
北秦岭晚古生代—晚中生代花岗岩类的Nd,Sr同位素研究表明:具低放射成因Pb同位素组成的花岗质岩基主要是南秦岭基底变质岩深熔的产物;而具高放射成因Pb同位素组成的原地、半原地型花岗岩类是北秦岭丹凤群有关岩石深熔和交代作用形成的产物.它们都可分为I型和S型,并可同时共存,岩浆源区中都有基性岩石物质的加入,其区别是基性岩类物质对I型花岗岩类的贡献分数较大,具有较小的亏损地幔模式年龄;由于岩浆源区中不同物质组成的混合,花岗岩类的亏损地幔模式年龄并不代表真实的壳幔分异事件的年龄.从新元古代到晚中生代,I型花岗岩类的d(t)和TDM具逐渐变小的趋势,反映了地壳中基性岩石物质发生深熔作用的时间逐渐变晚,而S型花岗岩类的d(t)增大,TDM变小,反映了基性岩石物质加入比例的增大,暗示着碰撞作用阶段具更加强烈的岩浆作用 相似文献
7.
铜陵地区高钾钙碱系列侵入岩 总被引:50,自引:3,他引:50
铜陵地区侵入岩在化学性质上不属于一般的钙碱系列岩石。它们可能是幔源碱性玄武岩浆同化古老麻粒岩相下地壳为主的酸性组分,同时发生结晶分离(AFC的产物。铜陵地区侵入岩的特点是:以石英二长闪长岩为主,高钾富碱,富Sr,δEu=0.9±。εNd和ISr较低,Pb同位素比值中等,但均有较好的线性关系。在εNd-ISr图和^207Pb/^204Pb-^206Pb/^204Pb图上,样品投影点的特点是均作陡倾斜 相似文献
8.
天山托洋峰花岗质岩石的同位素地球化学特征 总被引:5,自引:0,他引:5
分析了西天山托木尔峰地区花岗质岩石和基底岩石的稀土元素,微量元素以及O、Pb、Sr、Nd同位素组成。本区北部伊犁地块基底岩石的Nd同位素模式年龄约为1.9Ga,南部南天山褶皱带的约为0.705到0.733)表明本区花岗质岩石主要为地壳溶融产物。O、Pb、Sr、Nd同位素组成批示位于伊犁地块和南天山褶皱带的花岗岩源区岩石的Nd模式年龄都相当于伊犁地壳,但源区性质不同,前者源区δ^18O低,μ值低,T 相似文献
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武当地块基性岩墙群及耀岭河群基性火山岩的Sr,Nd,Pb,O同位素研究 总被引:9,自引:2,他引:7
武当地块基性岩墙群与耀岭河群基性火山岩的Sr、Nd、Pb同位素特征反映它们具相同的混合地幔源区。前者的(^87Sr/^86Sr)i=0.6905 ̄0.7061,εNd(t)=-1.9 ̄5.0,Δ^208Pb/^204Pb=35.49 ̄190.26,Δ^207Pb/^204Pb=4 ̄85,Th/Ta低,La/Yb变化大;后者的(^87Sr/^86Sr)i=0.6487 ̄0.7075,εNd(t)=0 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.
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
13.
Muriel Rocher Stéphane Baize Stéphane Jaillet Edward Marc Cushing Yannick Lozach 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
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正20141756 Chen Ruige(Mathematical College,China University of Geosciences,Beijing100083,China);Zhou Xun Numerical Simulation of Groundwater Level Fluctuation in a Coastal Confined Aquifer with Sloping Initial Groundwater Level Induced by the Tide(Geological Bulletin of China,ISSN1671-2552,CN11-4648/P,32(7),2013,p.1099-1104,6 illus.,16 refs.) Key words:confined water,groundwater level 相似文献
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正20141408 Cai Jia(Institute of Geology,Chinese Academy of Geological Sciences,Beijing100037,China);Liu Fulai Petrogenesis and Metamorphic P-T Conditions of Garnet-Spinel-Biotitebearing Paragneiss in Danangou Area,Daqingshan-Wulashan Metamorphic Complex Belt(Acta Petrologica Sinica,ISSN1000-0569,CN11-1922/P,29(7), 相似文献
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正20142386An Guoying(China Aero Geophysical Survey and Remote Sensing Center for Land and Resources,Beijing 100083,China)Application of Satellite Remote Sensing in Regional Hydrogeological Investigation:Taking Cenozoic Strata in Wenquan Sheet(1∶250 000)of Karakoram Range as an Example(Geosci- 相似文献
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正20141016An Chengbang(Key Laboratory of Western China’s Environmental Systems,Ministry of Education,Lanzhou University,Lanzhou 730000,China);Zhao Yongtao Lake Records during the Last Glacial Maximum from Xinjiang,NW China and Their Climatic Impli- 相似文献
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正20141538 Cao Qing(School of Earth Sciences and Engineering,Xi’an Petroleum University,Xi’an 710065,China);Zhao Jingzhou Characteristics and Significance of Fluid Inclusions from Majiagou Formation,Yichuan Huangling Area,Ordos Basin(Advances in Earth Science,ISSN1001-8166,CN62-1091/P,28(7),2013,p.819-828,7 illus.,3 tables,43 refs.) 相似文献
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正20142002 Wei Hualing(Institute of Geophysical and Geochemical Exploration,Chinese Academy of Geological Sciences,Langfang065000,China);Zhou Guohua Element Content and Mineral Compositions in Different Sizes of Soil in Tongling Area,Anhui Province(Geological Bulletin of China,ISSN1671-2552,CN11-4648/P,32(11),2013,p.1861 相似文献