Physical properties of the triassic host strata and their relations with gold mineralization in Youjiang Rift, South China     

张景荣  陆建军等 《中国地球化学学报》1998,17(3):226-233

Micro-fine disseminated gold deposits are hosted in the Triassic Baipeng Formation (argillaceous siltstone and arenaceous mudstone)in the Youjiang Rift,South China.Physical properties(grain size,specific surface,porosity and permeability)of the host rocks are studied with respect to ore-fluid cirulation,water-rock reaction and the effective volume from which ore-components could be extracted.On this basis,it is considered that the ore-fluid and oremetals were extracted mainly from the strata and hydrothermal solutions,tending to move to wards low-energy sites,depositing their gold in fault zones at the margins of the basin and in the circle fracture systems around underwater uplifts.The gold deposits resulted from the deepcirculation of hydrothermal solutions,Probably aided by multi-stage superimposition The quantites of ore-fluid necessary to form the deposits were estimated.  相似文献   

Intragenic and intergenic sequences regulating the expression of the 5＇-to-5＇ linked adult α- and β-globin genes from large yellow croaker Pseudosciaena crocea   总被引：1，自引：0，他引：1  

CHU Wuying YU Lian QIAN Ronghua MENG Tao ZHOU Ruixue FU Guihong CHEN Jia ZHANG Jianshe 《海洋学报(英文版)》2008,27(5)

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内生成矿中元素共生组合的物理因素   总被引：1，自引：0，他引：1  

李金宝  杨江  高永宝 《地球科学与环境学报》2008,30(3)

对自然界90多种元素的单质密度、沸点与熔点温度进行了统计，用元素的这些物理数据，编制了一个“元素物理性质地球化学图”。图中把自然元素分为5个亚类，用温度高低为纵坐标、单质密度大小为横坐标，建立直角坐标系，对每种元素进行了坐标定位，可直观看出自然界中元素以物理性质接近而共生组合，为矿物学、矿床学、地球化学研究提供了纲领性对比图。提出了“元素的液相温度范围”这一概念，凡是液相温度范围大的元素在自然界比较分散，成矿性比较差；凡是液相温度范围小的元素在自然界比较集中，成矿性较好。  相似文献   

2018年北极太平洋区域夏季海冰物理及光学性质的研究   总被引：2，自引：1，他引：1  

曹晓卫  卢鹏  雷瑞波  王庆凯  李志军 《海洋学报(英文版)》2020,39(9):25-37

The reduction in Arctic sea ice in summer has been reported to have a significant impact on the global climate. In this study, Arctic sea ice/snow at the end of the melting season in 2018 was investigated during CHINARE-2018, in terms of its temperature, salinity, density and textural structure, the snow density, water content and albedo, as well as morphology and albedo of the refreezing melt pond. The interior melting of sea ice caused a strong stratification of temperature, salinity and density. The temperature of sea ice ranged from –0.8℃ to 0℃, and exhibited linear cooling with depth. The average salinity and density of sea ice were approximately 1.3 psu and 825 kg/m~3, respectively, and increased slightly with depth. The first-year sea ice was dominated by columnar grained ice. Snow cover over all the investigated floes was in the melt phase, and the average water content and density were 0.74% and 241 kg/m~3, respectively. The thickness of the thin ice lid ranged from 2.2 cm to 7.0 cm, and the depth of the pond ranged from 1.8 cm to 26.8 cm. The integrated albedo of the refreezing melt pond was in the range of 0.28–0.57. Because of the thin ice lid, the albedo of the melt pond improved to twice as high as that of the mature melt pond. These results provide a reference for the current state of Arctic sea ice and the mechanism of its reduction.  相似文献   

鄂尔多斯盆地中西部长8砂岩的流体包裹体特征与油气成藏期次分析          下载免费PDF全文

罗春艳  罗静兰  罗晓容  白雪见  雷裕红  程明 《高校地质学报》2014,20(4):623

利用流体包裹体的分析测试技术与研究方法,对鄂尔多斯盆地中西部长8油层组的成藏期次进行了研究。烃类包裹
体及其伴生的盐水包裹体的岩相学特征、均一温度、盐度、密度及成分分析显示,长8储层主要发育两期烃类包裹体,第
一期分布在早期方解石胶结物、石英颗粒表面及其连生的石英加大边中以及未切穿石英颗粒的早期愈合裂缝中,其伴生盐
水包裹体的均一温度峰值为80~90℃;第二期烃类包裹体分布在石英颗粒表面和切穿石英颗粒的裂缝中,其伴生盐水包裹
体的均一温度峰值为100~120℃。储层成岩作用与油气充注微观分析、成岩-烃类充注演化时间序列研究,结合地层埋藏史
和热史分析表明,研究区经历了三期烃类充注事件：第一期（约169~161 Ma） 充注规模小,砂岩中未捕获到这一期适合进
行均一温度与成分测定的烃类包裹体,因此本研究缺乏这期包裹体的温度与成分数据;第二期（约148~135 Ma） 烃类充注
对应前述获得均一温度与成分数据的第一期烃类包裹体;第三期烃类充注规模最大,发生在早白垩世晚期的125.2~105.7 Ma
之间,为主成藏期,对应前述获得均一温度与成分数据的第二期烃类包裹体。  相似文献   

徐州沛县某矿煤矸石工程地质特性试验及地基稳定性分析     

何宝林  ;吴圣林  ;汪吉林 《中国煤炭地质》2014,(9):49-53

近年来,煤矿区用煤矸石回填、碾压后作为建筑地基基础得到了广泛的应用。以徐州沛县某矿煤矸石新鲜样品和回填多年的矸石(1#、2#)样品为例,对煤矸石的颗粒组成、矿物成份及其胀缩性进行分析,结果发现:新鲜矸石颗粒在10mm以上的含量较大,而1#、2#矸石颗粒级配在10mm以下的含量相对较大;煤矸石岩性成份主要为砂岩和泥岩,矸石样品中的粘土矿物有高岭石、绿泥石、伊利石、伊蒙混层和蒙脱石等,新鲜煤矸石中I/M混层和伊利石的含量与1#、2#矸石相比明显高出许多,因而具有较大的膨胀性;1#、2#矸石膨胀性很小,但是在遇水情况下仍具有一定的膨胀性。对煤矸石地基的破坏机理及作用过程进行了分析,并提出用矸石作地基基础时应注意的问题,认为采取适当的措施煤矸石回填地基作为建筑地基是安全可行的。  相似文献   

孔中震源的试验性研究     

Chen  ST 唐文敏 《国外煤田地质》1992,(2):48-54

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自由膨胀率质颖与自由膨胀比试验     

张炳慧  高秀芬 《地质实验室》1995,11(4):241-244

从理论和实践两方面论证了自由膨胀率的不稳定性和不可靠性，同时提出了自由膨胀比理论及测试方法。  相似文献   

Considering temperature dependence of thermo-physical properties of sandy soils in two scenarios of oil pollution     

Aleksey V. Malyshev  Anatoly M. Timofeev 《寒旱区科学》2014,6(4):0302-0308

We analyzed the heat conductivity and volumetric heat capacity of sandy soil contaminated in two scenarios of oil pollution, and also determined the temperature dependencies of these changed thermophysical properties. In the first pollution scenario, the oil product was introduced into wet river sand, and in the second case, dry sand was contaminated by the oil product and was then moistened with water. By considering these two scenarios as multicomponent dispersion systems with varying degrees of contamination and humidity, and by using a polystructural granular model with pore spaces and closed inclusions, we calculated that the heat conductivity of the sandy soil increased under the first pollution scenario and decreased under the second, but the change in the volumetric heat capacity of the sandy soil was proportional only to the amount of oil pollution, not the manner in which it was introduced. We also determined the temperature dependencies of these two thermophysical properties of sandy soil when polluted by oil, of which information will be useful for future containment and remediation of oil-contaminated soil.  相似文献   

2013年第7期要目     

《地球科学进展》2013,(6):702

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