山东山城金矿Ⅰ号脉矿物找矿标型

I号矿脉是山城金矿区中主要的工业矿体之一.黄铁矿和石英是主要的载金矿物,其标型特征是在矿脉空间上有规律的分布.矿体上部的黄铁矿以聚形晶为主,主要是八面体和立方体聚形晶以及立方体、八面体和五角十二面体聚形晶.黄铁矿的电物理性质,vnp＞|-17|,α＞|-120|.石英相对吸光度D1、D2、D2/D3、D3/D1、D2+3/D1相对较大.矿体下部的黄铁矿晶体形态主要是立方体单晶和立方体与八面体聚形晶,vnp＜|-17|,α＜|-120|,D1、D2、D2/Da、Da/D1、D2+3/D1相对较小.依据矿物标型展布规律,结合矿脉金含量的分布、载金矿物黄铁矿的晶体形态和热电性,以及石英相对吸光度的空间展布特征,建立了矿物学找矿模型,对深部矿脉进行了预测.     

山东纪山金矿矿物标型的空间分布

胶东半岛西北部招掖金矿带内的纪山金矿，3号脉和3号支脉是主要的工业矿体。矿物标型的空间分带：3号脉矿体上部，黄铁矿形态以八面体晶面发育的聚形晶体(Fo)为主，黄铁矿热电动势(Vn)绝对值小于18．5mV，石英中水的相对吸光度(D1)为6．00—4．50，石英中二氟化碳的相对吸光度(D2)为1．05—0．75；矿体下部，黄铁矿以立方体晶面发育的聚形晶体(Fc)为主，Vn绝对值大于18．5mV，D1为4．50—3．00，D2为0．75—0．55。3号支脉矿体上部，黄铁矿形态主要以Fo类聚形晶体为主，Vn绝对值小于21．0mV，D1为4．50—4．00，D2为0．80—0．70；矿体下部，黄铁矿形态主要出现Fc类聚形晶体，Vn绝对值大于21．0mV，D1为4．00—3．00，D2为0．70—0．55。矿物标型特征与矿石金品位相关。     

龙水金矿床黄铁矿热电性标型特征的研究

龙水金矿床的主要载金矿物黄铁矿，具有五角十二面体为主，立方体为辅聚形的粗晶压碎的特征，其热电性标型在Ⅰ号矿脉带、17号、19号矿体160m中段以上为空穴型，其深部出现电子型，根据黄铁矿热电性变化特征，预测深部仍有一定的找矿远景。     

龙水金矿床黄铁矿热电性标型特征的研究

龙水金矿床的主要载金矿物黄铁矿，具有五角十二面体为主，立方体为辅聚形的粗晶压碎的特征；其热电性标型在Ｉ号矿脉带、１７号、１９号矿体１６０ｍ中段以上为空穴型，其深部出现电子型，根据黄铁矿热电性变化特征，预测深部仍有一定的找矿远景。     

陕西双王金矿黄铁矿晶体形态和热电性特征对深部含矿性的预测

提要：黄铁矿是一种重要的载金矿物,在金矿床的寻找和评价工作中,黄铁矿晶体形态及热电性标型的研究尤为重要。本文通过对陕西双王角砾岩型金矿床矿体KT8和矿体KT9中ZK18、ZK30和ZK40三个坑内钻孔进行系统采样,从矿物学角度研究主要载金矿物黄铁矿的晶型及热电性特征。结果表明：黄铁矿晶形较为简单,仅出现立方体、八面体、五角十二面体及其组合成的聚形,其中以{hk0}习性的晶形为主,总体上晶形出现率由高到低依次为{hk0}、{100}、{111}。黄铁矿热电导电型多以混合型为主,其中N型热电系数为-322.0~-1.7μV·℃-1,P型热电系数为1.7 ~346.7μV·℃-1,黄铁矿热电参数变化较大,估算矿体剥蚀率为53.67%~60.12%,指示矿体KT8中钻孔30和40、矿体KT9中钻孔18深部均具有较好的矿化前景。     

煤层中的硫化铁矿物及其成因

在太原西山石炭—二迭纪月门沟煤系的某些煤层中,发现有不同形状和大小的硫化铁矿物结核。这种结核有非晶质和结晶质的。在1煤层中的黄铁矿,由大量的八面体和八面体与立方体聚晶,组成许多草莓状的黄铁矿群体。有的黄铁矿晶体排列成五边形状、羽状、平行状和同心圆状。在黄铁矿结核中,有一些板状的白铁矿与其共生。 在8煤层中的白铁矿晶体有:胶粒状、草莓状、短柱状、窗格状、纤维状、板状、放射状、叶片状、鸡冠状和筛状结构等形态。黄铁矿晶体有五角十二面体、立方体与八面体聚晶。本文探讨了该硫化铁矿物的成因。     

金厂沟梁金矿床矿脉原生地球化学特征及深部含矿性评价

金厂沟梁金矿床的矿脉走向主要为NW向和近SN向，NW向矿脉中矿体赋存深度比近别向矿脉浅约200m。近南北向矿脉的金矿体主要赋存在矿脉向西凸出与平稳变化的转折部位。As、Sb含量和F3因子得分值的高值指示矿体上部，Co、Mo含量和F5因子得分值的高值指示矿体的下部或尾部。黄铁矿是最主要的载金矿物，中粒、半自形晶，碎裂发育，晶体内含杂质较多的黄铁矿合金率高。在东矿区，近SN向矿脉的探矿重点应放在手找六中段以上部位的平行矿脉，NW向矿脉的探矿重点应放在二-三中段以上的较浅部位。     

埃及东南部沙漠地区汉默斯(Hamash)金矿中金从黄铜矿—黄铁矿中的重新运移

在埃及东南部的汉默斯沙漠地区,黄铁矿、黄铜矿和金有的产于石英脉中和花岗岩中,有的则以星散状、浸染状矿体赋存于高度蚀变的变质火山岩剪切带中。这些矿物的形成部分与磁黄铁矿、蓝辉铜矿、锑黝铜矿、辉铜矿、斑铜矿和铜蓝有关。黄钞矿具有两种晶形:(1)含有原生硫化物包裹体的自形—半自形巨型晶体,(2)细晶集合体。黄铜矿具有三种晶形:(1)自形巨型晶体,(2)细晶含微包裹体,(3)它型残余物。硫化物矿物有三个形成阶段,这三个阶段与热液的连续冷却结晶过程有关。在无序的高温热液阶段金以基质存在于早期硫化矿物中,在温度逐渐降低的后期阶段,含金黄铁矿经过重新运移,产生了自然金,显微镜分析结果证明,金和铜在晚期的黄铁矿中相对富集,分析研究过的表层蚀变矿物有:针铁矿、褐铁矿、金以及铁和铜的碳酸盐矿物和硫化物。     

江西茅排金矿矿物学找矿标志

黄铁矿和石英是主要的载金矿物。黄铁矿形态标型、成分标型、热电性标型和石英红外光谱标型特征具有指导找矿意义。江西茅排金矿区270m中段47勘探线及37～33勘探线的矿物标型特征为：黄铁矿形态见有八面体和五角十二面体，五角十二面体和八面体等聚形；出现空穴心型导电和混合型导电黄铁矿，若为电子心型导电黄铁矿，其热电动势和热电系数的绝对值相对较大；黄铁矿成分中检测出Cu；石英相对吸光度（37～33勘探线）DH2O 0.940 3, DCO2 0.1961, DCO2/DH2O0.259 1,略低于矿区研究样品的平均值（DH2O1.3267,DCO20.3090,DCO2/DH2O0.3382）.表明该处应位于矿体的中上部，矿体向下有一定的延伸。     

江西大背坞金矿自然金及主要载金矿物标型特征

研究大背坞金矿自然金及主要载金矿物的标型特征认为：自然金形态复杂多样,粒度以大于０．０７６ｍ ｍ 的中粗粒自然金占其总矿物量的７５．２５％ ,从而导致金矿化极不均匀,自然金成色为９８１～９９５,其嵌布形式以石英硫化物裂隙金为主。黄铁矿、毒砂在矿体中分布极不均匀。黄铁矿以立方体自形晶占７７．２％ ,含砷高达２４００×１０－ ６～２１４００×１０－ ６。统计表明,金在粒度小于０．５ｍ ｍ 的中细粒黄铁矿中更高度富集,含金量大于１００×１０－ ６。毒砂以柱状自形—半自形晶及三连晶为主,宏观上可见几率比黄铁矿低,毒砂中平均含金３２．９９×１０－ ６,含钴、锑低,反映热液型毒砂的特点。矿化石英的包裹体研究表明,成矿流体是一种岩浆水与变质水的混合流体。     

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.     

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).     

HYDROGEOLOGY

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     

METAMORPHIC PETROLOGY

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),     

SERIALS

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GEOPHYSICAL EXPLORATION

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-     

QUATERNARY GEOLOGY & GEOMORPHOLOGY

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-     

PETROLEUM GEOLOGY

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.)     

GEOCHEMISTRY

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