Y11B航空物探(电/磁)综合站西北找水初步成果   总被引：1，自引：1，他引：0  

孟庆敏 《物探与化探》1998,22(4):241-246

1997年9月23日～10月8日,在甘肃省安西—敦煌地区用Y11B航空物探(电/磁)综合站和GPS导航定位进行了地下水勘查试生产工作。用均匀大地模型,结合已知的水文地质资料,初步圈定了淡水区、过渡类型水区、咸水区和苦水区及泉水湖。所推断的水质和土壤含盐量与大的水文地质单元和1:20万水文地质普查报告都吻合得很好,且细节更为清楚。对差异较大的地方做了分析和解释。  相似文献   

Sequence stratigraphy of Holocene incised-valley fills and coastal evolution in the Gulf of Cádiz (southern Spain)     

Dabrio  Cristino J.  Zazo  Cari  Lario  Javier  Goy  José Luis  Sierro  Francisco J.  Borja  Francisco  González  José Ángel  Flores  José Abel 《Geologie en Mijnbouw》1998,77(3-4):263-281

This first sedimentary interpretation of two incised-valley fills in the Gulf of Cádiz (southern Spain), which accumulated during the last fourth-order eustatic cycle in response to fluvial incision, changes of sea level, and correlative deposition, relates the filling of the estuarine basins and their barriers with four regional progradation phases, H₁ to H₄. The cases studied are the wave-dominated Guadalete, and the mixed, tide and wave-dominated Odiel-Tinto estuaries. The sequence boundary is a type-1 surface produced during the lowstand of the Last Glacial period ca. 18 000 ¹⁴C yr BP. No fluvial lowstand deposits were found in the area. Due to rapid transgression the valley fills consist of transgressive and highstand sediments. The maximum landward advance of the estuarine barriers occurred ca. 6500–6000 ¹⁴C yr BP during the maximum of the Flandrian transgression, but there is no evidence of sea level rising appreciably above the present. A large part of the estuaries was filled during H₁ (ca. 6500–4400 ¹⁴C yr BP) but ravinement by shifting tidal inlets destroyed most of the coeval barriers. During the H₂ phase (ca. 4200–2550 ¹⁴C yr BP) sedimentation was favoured by arid conditions and concentrated in the axial estuarine zones and the barriers. Between H₂ and H₃ prevailing winds changed from W to WSW, increasing spit growth to the east and south-east. Progradation of bay-head deltas and flood-plains during H₃ (ca. 2300–800 ¹⁴C yr BP) and H₄ (500 yr ago to the present) further reduced the accommodation space in the largely-filled valleys, and sediment by-passed the estuaries and accumulated in the estuarine barriers as fast-growing spits. Arid conditions and increasing human activity have caused rapid coastal modifications.  相似文献   

中国数字地震台网数字化地震资料使用指南     

涂毅敏  陈运泰 《地震地磁观测与研究》1998,19(4):1-7

由于数字地震记录仪具有记录频带宽,分辨率高,动态范围大以及易于用计算机处理等优点,所以数字地震台网产出的数字地震资料成为地震活动性,震源机制,地球内部研究,地震监测及预报等的最基本数据源。  相似文献   

Some applications of humidity profiles estimated from INSAT infra red digital cloud imagery data     

Onkari Prasad  Sant Prasad  Kanti Prasad  R. R. Kelkar 《Journal of Earth System Science》1998,107(1):5-18

Moisture profiles have been estimated over the region bounded by the latitudes 40°N and 40°S and longitudes 30°E to 130°E using INSAT digital infra red cloud imagery data. The representativeness of these profiles in representing moisture field associated with the development and movement of synoptic scale systems during the period September 15th, 1996 to March 31st, 1997 has been examined. It has been shown that the changes in the moisture field associated with the withdrawal of the southwest and northeast monsoons from the Indian sub-continent, development and movement of synoptic scale sytems (depressions, tropical cyclones and waves in easterlies) and equatorial troughs in the Indian Ocean could be clearly seen in humidity profiles. The initial development of tropical systems is first seen in the humidity field in the upper troposphere. These profiles could be used in monitoring the initial development and subsequent movement of tropical systems. Further the data on moisture distribution from the data gap regions of the Indian Ocean could be used as an additional source of moisture in numerical analysis and prognosis.  相似文献   

CGG解释工作站Fastedit成多图的一种方法     

张虹 《物探化探计算技术》1998,(2)

在对ＣＧＧ解释工作站系统的深入分析基础上,提出了“处理成图数据、Ｆａｓｔｅｄｉｔ一次成多图、降低生产成本”的改进方法。  相似文献   

三维地震数据的方位角时差校正及其应用     

侯爱源  曾锦光 《物探化探计算技术》1998,20(3):270-273

三维地震数据的同一共中心点道集是由不同方位角的地震道组成的。当地下地层倾斜时,共中心点道集的反射同相轴就存在方位角时差。本文根据方位角时差校正（ＡＭＯ）的基本原理,从ｆ－ｋ域的正、逆ＤＭＯ出发,通过稳相法得到积分法ＡＭＯ脉冲响应的时间、振幅因子公式。把ＡＭＯ应用于一束实际三维地震数据处理,经ＡＭＯ处理后的剖面绕射波和断面反射波得到了加强,其效果是令人满意的。  相似文献   

航空物探剖面图数据提取法     

邢俊兵 《黄金地质》1998,4(2):55-57

我国的主要成矿区带上有着丰富的航空物探资料,而这些资料多以模拟方式进行记录,所以,我们在日常工作中所收集到的资料多是平面剖面图或平面等值线图。提供一种用数字化对平面剖面图进行数据提取的方法,为平面剖面图的二次利用提供了条件。  相似文献   

Preparation of Two New GSJ Geochemical Reference Materials: Basalt JB-1b and Coal Fly Ash JCFA-1   总被引：1，自引：0，他引：1  

Shigeru Terashima  Masahiro Taniguchi  Masumi Mikoshiba  Noboru Imai 《Geostandards and Geoanalytical Research》1998,22(1):113-117

  相似文献   

Platinum-Group Element Geochemical Certified Reference Materials (GPt1-7)   总被引：2，自引：0，他引：2  

Mingcai Yan  Chunshu Wang  Tiexin Gu  Qinghua Chi  Zhong Zhang 《Geostandards and Geoanalytical Research》1998,22(2):235-246

Unlike the situation for other elements, few reference materials certified for the platinum-group elements are currently available. Therefore, the GPt1-7 series of PGE geochemical CRMs, prepared by the IGGE, represent an important addition and comprise a range of matrix types, including a soil, stream sediment, Mg-rich ultramafic rock, Fe-rich ultramafic rock, platinoid ore depleted in Cu, Ni and Fe, and a chromitite. The concentration of PGE in these samples ranges over 4-5 orders of magnitude and the samples were shown to have good homogeneity as assessed by a variance test. Analytical methods based on different principles were used in sample certification, including several fire assay and wet chemical procedures used for decomposition and preconcentration. Certified values for the elements Pt, Pd, Os, Ru, Ir, Rh and Au were determined by AAS, catalytic colourimetry (COL), catalytic polarography (POL), atomic emission spectrometry (AES), ICP-MS and NAA. Recently, the GPt1-7 samples were approved as national primary CRMs by the State Bureau of Technical Supervision of China.  相似文献   

GIS在1∶5万榆关镇幅区域地质调查中的应用     

董国臣  郝国杰  陈达  李承东  郑建民 《地质通报》1998,(4)

讨论ＧＩＳ系统在１∶５万区调中的应用,阐述ＧＩＳ系统在区调过程中对各种资料的处理与编辑,包括野外资料的采集、图层的划分及图形与图像图件的编制。建立了榆关镇幅综合信息库。  相似文献