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1.
河南栾川南部地区与Mo—W矿床有关的燕山期花岗岩特征 总被引：9，自引：0，他引：9
河南栾川南部分布着一系列与钼钨矿化有关的燕山期花岗岩小岩体。根据这些岩体的含矿性、地质及地球化学特征可将其分为三类。第一类岩体往往与大型一超大型Ｍｏ－Ｗ矿床有关，岩体顶部有纹层状石英层，石英辉钼矿脉发育。岩石中ＳｉＯ２、Ｋ２Ｏ、Ｒｂ含量高，Ｋ２Ｏ／Ｎａ２Ｏ、Ｒｂ／Ｓｒ比值高，Ａｌ２Ｏ３、ＦｅＯ、ＣａＯ、Ｎａ２Ｏ、Ｓｒ含量低。第二类岩体往往与中小型Ｍｏ－Ｗ矿床有关，岩体中含辉钼矿石英脉发育较差，岩石中ＳｉＯ２、Ｋ２Ｏ含量中等，Ｋ２Ｏ／Ｎａ２Ｏ比值中等。第三类岩体不含Ｍｏ－Ｗ矿，岩体中各种脉体不发育，岩石中ＳｉＯ２、Ｋ２Ｏ、Ｒｂ含量低，Ｋ２Ｏ／Ｎａ２Ｏ、Ｒｂ／Ｓｒ比值相对较低，Ａｌ２Ｏ３、Ｎａ２Ｏ、Ｓｒ含量相对较高。研究还表明小岩体的分异演化程度与小岩体的合矿性有密切的内在联系。 相似文献
2.
追索北峪奥长花岗岩与围岩（早元古代绛县群变富钾流纹岩）接触关系，发现北峪奥长花岗岩已侵入于围岩地层中，表明其为早元古代岩浆型侵人体。使用全岩Ｒｂ－Ｓｒ等时线方法测定北峪奥长花岗岩时代，获得的年龄为２１０７±５９Ｍａ（２），由此推断北峪岩体成岩时代为２１００Ｍａ，代表了本区绛县运动岩浆深成事件年龄。其８７Ｓｒ／８６Ｓｒ初始比值为０．７０２３，呈现出幄源花岗岩的特点，但结合其铝过饱和特点以及具高的Ｏ全岩比例，推测其主要来源于下地壳麻粒岩相变质的沉积岩，但可能存在地幔物质添加或已遭受地幔交代作用的改造。 相似文献
3.
山西中条山地区北峪奥长花岗岩的同位素年龄和同位素地球化学特征 总被引：1，自引：0，他引：1
赵风清 《前寒武纪研究进展》1997,20(1):44-50
追索北峪奥长花岗岩与围岩接触关系，发现北峪奥长花岗岩已侵入于围地层中，表明其为早元古代岩浆型侵入体。使用全岩Ｒｂ－Ｓｒ等时线方法测定北峪奥长花岗岩时代，获得的年龄为２１０７±５９Ｍａ（２σ），由此推断北峪岩体成岩时代为２１００Ｍａ，代表了本区绛县运动岩浆成事件年龄。 相似文献
4.
赣东北蛇绿混杂岩带中大洋斜长花岗岩的地球化学和岩石成因 总被引：10，自引：0，他引：10
赣东北蛇绿混杂岩带中的西湾斜长花岗岩富Ａｌ２Ｏ３和Ｎａ２Ｏ,贫Ｋ２Ｏ;Ｓｒ、Ｂａ和Ｔｈ含量高,而Ｒｂ和高场强元素含量很低;ＬＲＥＥ富集、无Ｅｕ异常;δＮｄ（ｔ）值高,为５．３９。（＾８７Ｓｒ／＾８６Ｓｒ）ｉ低,为０．７０２７。这些特征表明西湾斜长花岗岩是大洋斜长花岗岩。在Ｌａ／Ｓｍ－Ｌａ图中,该斜长花岗岩与超基性岩和基性岩的分离结晶趋势不一致,所以它不是岩浆分离结晶的产物,而可能是基性岩石小比例部 相似文献
5.
嵩山A型花岗岩的地质地球化学特征和构造环境 总被引：8，自引：0，他引：8
从岩石学、岩石化学、微量元素、ＲＥＥ等方面讨论了嵩山古元古代钾长花岗岩体的地质地球化学特征，结果表明这些岩体属于Ａ型花岗岩，其ＳｉＯ２、Ｋ２Ｏ、Ｋ２Ｏ／Ｎａ２Ｏ、Ｆ、Ｇａ、Ｈｆ、Ｒｂ、Ｙ、Ｃｏ、Ｇａ／Ａｌ、ＲＥＥ高，Ａｌ２Ｏ３、ＭｇＯ、ＣａＯ、Ｎａ２Ｏ、Ｂａ、Ｓｒ、Ｖ、Ｔｈ低，Ｅｕ为０．１５～０．２７，Ａ／ＣＮＫＭ＜１．１０，这些岩体是与古元古代熊耳群火山岩相伴生的钾质侵入岩，两者均形成于非造山的大陆裂谷环境，表明华北陆台南缘在古元古代晚期处于拉张的非造山构造环境。 相似文献
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吉乃县塔斯特岩体地质地球化学特征及含矿性评价 总被引：5，自引：0，他引：5
塔斯特岩体由石英闪长岩、英云闪长岩、二长花岗岩和钾长花岗岩组成。岩石均具有高Ｎａ低Ｋ,Ｎａ２Ｏ、Ｆｅ２Ｏ３、Ｈｆ、Ｋ／Ｒｂ偏高,Ｋ２Ｏ、ＣａＯ、ＦｅＯ、Ｒｂ、Ｓｒ、Ｎｂ、∑ＲＥＥ、δ＾１８Ｏ、Ｒｂ／Ｓｒ明显偏低的特点。岩石化学和地球化学特征表明该岩体为形成于火山弧环境的“Ｉ”型花岗岩。岩体中Ａｕ、Ａｇ、Ａｓ、Ｂｉ、Ｃｕ等成矿元素明显富集,并与该岩体中金矿床、矿点的元素组合一致,说明该岩体与Ａｕ的成 相似文献
8.
鲁西北台北斜东缘沙沟地区深熔型花岗岩质量平衡分析表明（１）以体积守恒为限制条件，深熔型二长花岗质片麻岩带入１．９０－１．９２％的质量，微斜长石花岗岩带和４．４６－４．５５％，的质量，深熔型花岗岩类有Ｋ２Ｏ、ＳｉＯ２、Ｒｂ、Ｂａ的获得，ＴｉＯ２、Ａｌ２Ｏ３、ＦｅＯ、Ｆｅ２Ｏ３、ＭｎＯ、ＭｇＯ、ＣａＯ、Ｎａ２Ｏ、Ｐ２Ｏ５、及Ｃｒ、Ｎｉ、Ｃｏ、Ｓｒ、Ｚｒ、Ｔａ、Ｎｄ则损失；９２）风岩类的质量等比线显示， 相似文献
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扬子克拉通北缘的铁船山岩体形成于新元古代，其岩石类型为霓石－钠铁门石花岗岩，岩石富碱质、Ｓｔ、Ｆｅ、ＲＥＥ和高场强元素，而贫Ａｌ、Ｃａ、Ｍｇ、Ｓｒ、Ｂａ、Ｃｏ、Ｎｉ等组分，δＥｕ＝０．２０，Ａ／ＫＮＣ＝０．８５，Ｋ２Ｏ＋Ｎａ２Ｏ／Ａｌ２Ｏ３＝１．０９，Ａ·Ｒ＝９．２８，岩石属典型的Ａ型花岗岩，Ｎｄ、Ｓｒ和Ｏ同位素示踪反映其成岩物质来自于壳幔混合源区。根据区域地质背景的综合分析，岩体形成于活动陆缘的张裂构造环境，属活动板块边缘拉张型花岗岩。 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
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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
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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
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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
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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
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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