地幔橄榄岩部分熔融及相转变（尖晶石相→斜长石相）过程中的固相化学成分演化──Ⅰ．实验研究

在温度为ｌｌ３０─ｌ４５０℃，压力为０．４─２．０ＧＰａ条件下，实验研究了地幔橄榄岩部分熔融及相转变（尖晶石相→斜长石相）过程中的固相化学成分演变。在部分熔融中，随熔融度的增大，橄榄石的Ｍｇ／（Ｍｇ＋Ｆｅ）尖晶石和斜方辉石的Ｍｇ／（Ｍｇ＋Ｆｅ）及Ｃｒ／（Ｃｒ＋Ａｌ）逐渐增大；而橄榄石中的Ｃａ含量增至单斜辉石消失后逐渐降低；尖晶石中的Ｔｉ以较低的含量（ＴｉＯ２＜０．１５％）保持不变或稍有降低；斜方辉石中的Ｔｉ含量及单斜辉石的Ｎａ和Ｔｉ含量逐渐降低，直至非常小的值。在从尖晶石橄榄岩向斜长石橄榄岩的相转变过程中，尖晶石强烈富Ｔｉ，且其Ｃｒ／（Ｃｒ＋Ａｌ）逐渐增大；斜方辉石中的Ｔｉ含量和Ｃｒ／（Ｃｒ＋Ａｌ）同时逐渐增大；单斜辉石中的Ｎａ含量降低而Ｔｉ含量升高或保持不变。当斜长石橄榄岩经受了部分熔融（即使很微弱），其在相转变过程中引起的各矿物相的化学成分特征要全部消失，而表现部分熔融作用的特征。这可作为判别橄榄岩在斜长石相域内是否经历了部分熔融的标志。关键词     

一种新的闪石共存对—铁闪石与铁韭闪石对

新近在我国山西省娄烦县尖山铁矿的角闪片岩中发现一种取向连生的镁铁质闪石与钙质闪石共存对。电子探针分析确定它们分别为铁闪石Ｋ０．００１（Ｎａ０．０２７Ｃａ０．０７３Ｍｎ０．０３１Ｆｅ＾２＋１．８０１）１．９３２（Ｆｅ＾２＋２．９４８Ｍｇ１．９６４Ｔｉ０．００２Ａｌ０．０８７）５Ｓｉ８．０６９Ｏ２２．１０（ＯＨ）２与铁韭闪石（Ｋ０．１３５Ｎａ０．４６１）０．５９６（Ｎａ０．０８８Ｃａ１．８５３Ｍｎ０．     

八庙—青山金红石矿床化学成分与成矿关系

本矿床是我国金红石矿床重要的成因及工业类型，为具有特定化学成分的岩石在特定变质条件下形成的。本文通过对大量数据的处理，查明了化学成分和成矿的关系，高Ａｌ２Ｏ３，ＭｇＯ，Ｆｅ２Ｏ３＋ＦｅＯ，Ｋ２Ｏ，Ｐ２Ｏ５，Ｈ２Ｏ＾＋，ＭｎＯ，低ＳｉＯ２，ＣａＯ，Ｎａ２Ｏ，ＣＯ２，Ｓ等，利于钛富集；高ＴｉＯ２，ＭｇＯ，Ｐ２Ｏ５，Ｓ，低ＳｉＯ２，ＣａＯ，Ｋ２Ｏ，Ａｌ２Ｏ３，Ｆｅ２Ｏ３／ＦｅＯ，利于金红石形成，高Ｓｆ，     

斜磷铁锰矿族的新变种─—镁斜磷铁锰矿

镁斜磷铁锰矿产于四川某地含铍伟晶岩的中部，该伟晶岩分带性弱，但钠长石化发育，与之共生的矿物有镁电气石、蓝色绿柱石、石榴石、白云母、石英及黄铁矿等。镁斜磷铁锰矿为肉红色块状体，玻璃光泽，摩氏硬度５．５－６．０，比重３．８１，具（００１）解理，在单偏光下无色或带有灰色的白色，多色性弱，突起较高，Ｎｇ＝１．７３４，Ｎｍ＝１．７２８，Ｎ＿Ｐ＝１．６７５，Ｎｇ－Ｎ＿Ｐ＝０．０５９，斜消光，Ｒ＞Υ。镁斜磷铁锰矿的化学成分Ｗ（Ｂ）／％是Ｍｇｏ６．２ｌ．Ｃａｏ０．０７，Ａｌ＿２Ｏ＿３０．８ｉ，Ｓｉｏ＿２ｏ．３９，ＭｎＯｌ４．３６．Ｆｅｏ＿３５．４８，Ｐ＿２ｏ＿５４ｌ．８５，∑９９．１７。     

湘西晚前寒武纪层状硅质岩的热水沉积地球化学标志及其环境意义

湘西晚前寒武纪层状硅质岩化学成分纯净,硅质矿物平均含量９５％以上。岩石富Ｆｅ、Ｍｎ,相对贫Ａｌ、Ｔｉ、Ｍｇ,富含Ｂａ、Ａｓ、Ｓｂ、Ａｇ、Ｕ等微量元素。Ｆｅ／Ｔｉ、（Ｆｅ＋Ｍｎ）／Ｔｉ、Ａｌ／（Ａｌ＋Ｆｅ＋Ｍｎ）、Ｕ／Ｔｈ比值及ＡｌＦｅＭｎ、ＦｅＭｎ（Ｎｉ＋Ｃｏ＋Ｃｕ）三角图均表明岩石为热水来源沉积岩。稀土元素总量低,Ｃｅ负异常,重稀土相对富集,显示主要为热水沉积作用的产物。δ３０Ｓｉ、δ１８Ｏ值及岩石的形成温度清楚地表明组成岩石的二氧化硅来源于热水。岩石的ＭｎＯ／ＴｉＯ２、δＣｅ及δ３０Ｓｉ值分析表明硅质岩沉积于大陆边缘斜坡半深海至大洋盆地深海环境中     

浙西石炭纪层状硅质岩地球化学特征及其意义

在浙西石炭纪地层中存在与地层整合产出的层状硅质岩。硅质岩中ＦｅＯ、ＭｎＯ、ＴｉＯ２、Ａｌ２Ｏ３、ＭｇＯ、ＣａＯ、Ｎａ２Ｏ、Ｋ２Ｏ等含量相对较高，富集Ａｓ、Ｓｂ、Ｂｉ、Ａｕ、Ａｇ、Ｇａ，Ｆｅ２Ｏ３／ＦｅＯ、ＳｉＯ２／Ａｌ２Ｏ３、ＳｉＯ２／（Ｎａ２Ｏ＋Ｋ２Ｏ）、ＳｉＯ２／ＭｇＯ比值较小，稀土元素总量低，Ｃｅ弱负异常，重稀土相对富集，包裹体富含气相组份ＣＨ４、ＣＯ２、Ｎ２、ＣＯ、Ｈ２，具热水沉积硅质岩的地球化学特征。在Ｆｅ—Ｍｎ—（Ｎｉ＋Ｃｏ＋Ｃｕ）三角图及ＳｉＯ２—Ａｌ２Ｏ３、ＳｉＯ２—Ｆｅ２Ｏ３图上均属于热水沉积硅质岩。硅质岩中硅、氧同位素也显示其热水成因之特点。硅质岩的硅同位素和稀土元素Ｃｅ／Ｃｅ※值表明本区层状硅质岩主要是在浅海环境下沉积的。硅质岩的形成温度较高，为９８℃～１５２℃     

冲绳海槽浮岩的蚀变作用原因

在冲绳海槽海底浮岩的蚀变中ＳｉＯ２和Ｎａ２Ｏ相对含量明显减少，而Ｆｅ２Ｏ３、ＴｉＯ２、ＣａＯ、ＭｇＯ、ＣＯ２、ＭｎＯ和Ｐ２Ｏ５含量则明显增加；Ａｌ２Ｏ３、Ｋ２Ｏ、ＦｅＯ含量基本保持不变。蚀变作用导致了赤铁矿、针铁矿和非晶质Ｆｅ、Ｍｎ氧化物和绿泥石等粘土矿物的生成。多数微量元素的含量在蚀变样品中增加，尤其是Ｃｒ、Ｃｏ、Ｘｃ、Ａｓ、Ｂｒ、Ｒｂ和Ｔｈ。除Ｎｄ外轻稀土元素含量增加，大部分重稀土元素含量减小     

新发现的沂蒙矿类质同象系列矿物：K（Ti5Fe3Cr2Mg2）12O19及Ba（…

在山东蒙阴金伯利岩中，首次发现了沂蒙矿类质同象系列新的富Ｔｉ矿物（变）种。理想的晶体化学式可表达为：Ｋ（Ｔｉ５Ｆｅ３Ｃｒ２Ｍｇ２）１２Ｏ１９（简称Ｋ－Ｔｉ沂蒙矿）（Ｂａ，Ｋ）（Ｔｉ５Ｆｅ４Ｍｇ２Ｃｒ）１２Ｏ１９（简称Ｂａ－Ｔｉ沂蒙矿）从而与原来确定的沂蒙矿Ｋ（Ｃｒ５Ｔｉ３Ｆｅ２Ｍｇ２）１２Ｏ１９和钡钛铁铬矿（Ｂａ，Ｋ）（Ｃｒ４Ｆｅ４Ｔｉ３Ｍｇ）１２Ｏ１９ｇ一起构成了金伯利岩中ＡＭ１２Ｏ１９磁铁铅矿     

新疆莫托萨拉铁锰矿硅质岩特征及其成因探讨

莫托萨拉铁锰矿硅质岩呈层状产于铁矿中,含热水沉积矿物。岩石的Ｆｅ２Ｏ３,Ａｕ,Ａｇ,Ｃｕ,ｐｂ,Ｚｎ,Ａｓ,Ｓｂ,Ｈｇ质量分数高,Ｃｒ,Ｎｉ,Ｃｏ,ＦｅＯ,Ａｌ２Ｏ３质量分数低,ｅ（Ａｌ）／ｗ（Ａｌ＋Ｍｎ＋Ｆｅ）比值低,这些元素组合指示出其热水 成因,在判别硅质岩形成作用的主元素和微量元素关系图上,硅质岩主要位于热水沉积作用的范围内或接近于热水沉积作用。岩石的稀土元素和Ｏ,Ｓｉ同位且成表明硅质岩是     

北祁连山寒武─奥陶纪硅质岩岩石化学特征及形成环境

通过对北祁连地区寒武－奥陶纪硅质岩岩石化学特征研究，揭示硅质岩在成分上具有明显差异，这种差异是由于其生成构造环境不同而形成的。一般形成于大洋中脊的硅质岩在岩石化学成分上富于Ｆｅ＿２Ｏ＿３和ＭｎＯ，而Ａｌ＿２Ｏ＿３含量最低。形成于近弧环境的硅质岩在成分上相对富含ＦｅＯ＋ＭｇＯ＋ＣａＯ，而Ａｌ＿２Ｏ＿３较洋脊的稍高．但不及形成于深海盆地的硅质岩。富含Ａｌ＿２Ｏ＿３而贫Ｆｅ＿２Ｏ＿３、ＭｎＯ、ＦｅＯ、ＭｇＯ和ＣａＯ的硅质岩形成于近陆的深海或半深海盆地或初始洋盆的盆缘地带。由此可见，硅质岩岩石化学成分具有明显的指相意义。然而，研究表明，硅质岩中ＳｉＯ＿２含量的高低并不具有指相意义。     

The terrestrial fauna of the Late Triassic Pant-y-ffynnon Quarry fissures,South Wales,UK and a new species of Clevosaurus (Lepidosauria: Rhynchocephalia)

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.     

Définition d'une limite multicritère ; stratigraphie du passage Campanien–Maastrichtien du site géologique de Tercis (Landes,SW France)Definition of a multi-criteria boundary; stratigraphy of the Campanian–Maastrichtian interval of the geological site at Tercis (Landes,SW France)

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.     

The effect of water on accessory phase solubility in subaluminous and peralkaline granitic melts

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.     

Quaternary stresses revealed by calcite twinning inversion: insights from observations in the Savonnières underground quarry (eastern France)

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).     

NONMETALS DEPOSITS

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.)     

MATHEMATICAL GEOLOGY

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,     

PROSPECTING EXPLORATION

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.)     

STRUCTURAL GEOLOGY

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-     

STRUCTURAL GEOLOGY

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