应用体波模拟和反演确定震源参数中某些易犯的错误...     

Wagn.  GS 金耀 《世界地震译丛》1992,(5):35-42

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地震前兆研究     

Paul  GS 韩德润 《地壳构造与地壳应力》1997,(2):36-38

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物探技术在布敦乌拉隐伏矿产勘查中的应用效果     

刘永祥  刘福胜  王欣  韩晓阳  谢磊 《中国煤炭地质》2021,(3):60-63

内蒙古西乌珠穆沁旗布敦乌拉矿区多为第四系覆盖。在该矿区多金属勘查中,依据土壤地球化学圈定的矿化异常布置激电中梯测量,圈定1处激发极化率异常区,长度约890m,宽度约520m,位于已知断层F 1与推断断层F 2之间。采用可控源音频大地电磁测深剖面对该激电异常进行探测,解释视充电率多峰异常与反演电阻率高低跳跃对应区域为矿致异常区。通过钻探验证,发现银多金属矿床资源储量523.93万t,取得了良好的地质找矿效果。  相似文献   

De—xpert—一种识别沉积体系的专家系统     

Vish.  GS 杨耀忠 《国外石油地质》1993,(1):74-77

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磁铁矿的磁学性质与条带构造     

刘永祥 《长春地质学院学报》1990,20(1):69-78

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麻粒岩成因：变质观     

Harl.  SL 刘永祥 《世界地质》1991,10(2):1-32

尽管许多当代评述都强调麻粒岩在其压力—温度(P—T)条件和轨迹方面的一致性,但实际上麻粒岩保存了指示它们的形成模式多样性的一系列重要的岩石学特征。对90多个麻粒岩地体或产状的测定,揭示出其中50％以上记录了超出许多作者提出的7.5±1Kb和800±50℃平均麻粒岩范围的P—T条件。特别是,不断识别出的温度很高(900～1000℃)的一些地体的数量还在增加,这两种P—T条件都是根据特殊的矿物组合和地温压力测定确定的。确定和解释P—T历史的岩石成因网格和地温压力测定法二者都是在反应结构范围内判断的,而反应结构既可证明很大的P—T条件范围确实是真实的,又可证明近等温减压(ITD)和近等压冷却(IBC)两种P—T轨迹都是主要的。正象在南印度和斯里兰卡见到的那样,由富CO_2流体进入而引起斜长角闪岩—麻粒岩的转化是一种例外情况,不代表大多数地体中有关的流体过程。然而,人们认为缺少流体条件是在接近它们记录的热高峰时间的大多数麻粒岩的特征。把ITD麻柱岩解释为地壳碰撞增厚过程中形成的。伴随的岩浆填加作用是一个重要的额外热源。但没有把侵蚀作用单独看作是碰撞后的主要减薄过程。换言之,ITD轨迹是在中等或略低的速率扩张期间与构造剥露有关的、削减非常迅速的(1～2mm/年暴露)阶段产生的。IBC麻粒岩可能形成于各种各样的环境中。呈现逆时针P—T历史的麻粒岩被解释为形成于大量岩浆增生作用的下部地区,这些地区有或无附加地壳扩张。正常厚度地壳的扩张期间也可形成浅部(<0.5GPa)的IBC麻枉岩,但较深层位的IBC则要求更复杂的模式。在地壳深部出现的许多IBC麻粒岩可能形成于经受碰撞后非常迅速(5mm/a)扩张变薄的增厚地壳中。推测在许多麻粒岩中与其说ITD,还不如说IBC轨迹的保存主要是与增厚地壳的扩张减薄的速率和时间范围有关,而且也应当见到ITD到IBC之间的混杂轨迹。大多数IBC麻粒岩,也许还有许多ITD麻粒岩,都没有作为产生它们的构造幕的结果暴露在地表,但是,它们在这些事件之后,在中部或下部地壳中保留了很长一段时间(100～200Ma)。大多数麻粒岩地体最后剥露只有通过它们掺杂到与其形成无关的、后来的构造和岩浆事件中才能发生。  相似文献   

借助地面模型进行航空像片GIS正射投影数字化   总被引：1，自引：0，他引：1  

Tudor  GS 张保钢 《武测译文》1994,(2):46-50

为更新地理信息系统的数据库，需对单张原始航片数字化的空间数据进行解析改正。用数字地形数据和适宜的水平控制基础可编制共线改正模型。用这种像片数字化方法可在没有摄影测量设备和数字化仪工作站情况下更新空间数据库。数据录入人员不需专门的摄影测量训练。对所测量的地面目标的测试表明，像片数字化法的精度（５．５±３ｍｍ）超过了用现有的野外数据输入方法所达到的精度。野外工作人员拥有数据的所有权并能控制更新过程。该  相似文献   

The speciation of dissolved copper,cadmium and zinc in Manila Bay,Philippines     

Velasquez IB  Jacinto GS  Valera FS 《Marine pollution bulletin》2002,45(1-12):210-217

At present, there is a very limited information on the levels and distribution of dissolved metals in Manila Bay. In this study, the horizontal and vertical distribution of operationally defined species (labile, bound and total) of dissolved copper (Cu), cadmium (Cd) and zinc (Zn) were determined using differential pulse anodic and cathodic stripping voltammetry in water samples obtained from 18 stations in November 1998. In addition, the 24-h variability in the concentrations of these species at different depths in the water column was determined. These measurements were complemented by the determination of temperature, salinity, dissolved oxygen, chlorophyll a, particulate organic carbon and nutrients. Results showed that more than 50% of total dissolved copper and cadmium were labile while 50% of total dissolved zinc was organically bound. Vertical profiles showed that Cu, Cd and Zn concentrations were generally high at the surface. Zinc and cadmium were characterised by the presence of a mid-depth minimum while copper did not show any clear vertical trend.

Dissolved Cu concentrations during the spatial and diurnal samplings ranged from 0.32 to 6.95 nM and 1.52 to 45.65 nM, respectively. For Cd, the concentrations in 18 stations ranged from 0.05 to 2.92 nM, and from 0.03 to 2.42 nM over a 24-h period. Zn concentrations ranged from 2.48 to 147.43 nM and 2.87 to 88.27 nM during the spatial and diurnal samplings, respectively. The large variation in the concentration of Cu, Cd and Zn in the bay was observed to be associated with the presence of a large vertical density gradient in the water column, which appeared to limit the exchange of materials between the surface and bottom waters. Elevated levels of these metals near point sources suggest anthropogenic inputs in the bay.  相似文献   

Tar ball frequency data and analytical results from a long-term beach monitoring program     

Owens EH  Mauseth GS  Martin CA  Lamarche A  Brown J 《Marine pollution bulletin》2002,44(8):770-780

Following the spill of fuel oils from the New Carissa in February 1999, approximately 300 km of beaches on the Pacific coast of North America were surveyed. A long-term observation program focused on the documentation of stranded tar balls in the vicinity of the spill site. Systematic beach surveys which were conducted over the period March 1999 to April 2001 and semi-logarithmic scale, time-series plots proved the most useful format for identifying trends. Beach monitoring continued through to August 2001. by which time 212 tar balls had been analyzed by GC/MS for their chemical characteristics. The samples of tar balls collected between February 1999 and August 2001 were qualitatively compared with New Carissa source oils (NCSO) and 101 (48%) were not consistent with NSCO. The presence of tar balls that are not related to an incident can confound attempts to define cleanup or endpoint criteria and to assess possible injury to natural resources.  相似文献   

First Results from Viper: Detection of Small-scale Anisotropy at 40 GHz     

Peterson JB  Griffin GS  Newcomb MG  Alvarez DL  Cantalupo CM  Morgan D  Miller KW  Ganga K  Pernic D  Thoma M 《The Astrophysical journal》2000,535(2):L83-L86

Using all available major samples of Seyfert galaxies and their corresponding closely matched control samples of nonactive galaxies, we find that the bar ellipticities (or axial ratios) in Seyfert galaxies are systematically different from those in nonactive galaxies. Overall, there is a deficiency of bars with large ellipticities (i.e., "thin" or "strong" bars) in Seyfert galaxies compared to nonactive galaxies. Accompanied with a large dispersion due to small number statistics, this effect is strictly speaking at the 2 sigma level. To obtain this result, the active galaxy samples of near-infrared surface photometry were matched to those of normal galaxies in type, host galaxy ellipticity, absolute magnitude, and, to some extent, redshift. We discuss possible theoretical explanations of this phenomenon within the framework of galactic evolution, and, in particular, of radial gas redistribution in barred galaxies. Our conclusions provide further evidence that Seyfert hosts differ systematically from their nonactive counterparts on scales of a few kiloparsecs.  相似文献