搜索结果: 136-150 共查到“知识库 地质学其他学科”相关记录420条 . 查询时间(3.017 秒)
泥石流点密度和面密度对区域泥石流危险度的影响——对比研究
泥石流 分布密度 区域危险度
2013/9/25
泥石流分布密度是区域泥石流危险度评价的主要指标。泥石流分布密度分为点密度和面密度,前者是指每103km内泥石流沟的数量;后者是指每103km内泥石流沟的流域面积。以川西山区60个县市区为研究样本,分别以泥石流点密度和面密度作为区域泥石流危险度的主要评价指标,结合7个相同的区域泥石流危险度的次要评价指标,对研究区以县市区为基本单元的区域泥石流危险度进行了定量评价。结果表明,各县市区面积加权平均后的泥...
Fractional Crystallization and Magma Mingling/Mixing Processes in the Monzonitic Association in the SW Part of the Composite Yozgat Batholith (Şefaatli-Yerköy, SW Yozgat)
Composite Yozgat batholith fractional crystallization magma mingling/magma mixing S type I type Mtype assosiations
2009/7/8
The Yozgat batholith takes place in the passive margin of the Anatolide-Pontide convergence system. It includes; syn-collisional S-type, two-mica granites; post-collisional I-type, calcalkaline monzon...
Geology of the Ören and Surrounding Areas, SW Anatolia
Ö ren Gö kova Neogene basin extensional tectonics
2009/7/8
On the Lycian Nappes of SW Anatolia, Neogene basins developed along two different trends in different periods. NNE-trending basins formed during the Early-Middle Miocene period as exemplified by the &...
Geology and Structural Evolution of the Tokat Massif (Eastern Pontides, Turkey)
Tokat Group Karakaya Complex structural evolution eastern Pontides
2009/7/8
The Tokat Massif consists of a pre-Jurassic metamorphic complex that crops out widely between Amasya and Reşadiye in the western part of eastern Pontides, and which can be correlated with the Kar...
Laboratory Determination of Multicomponent Effective Diffusion Coefficients for Heavy Metals in a Compacted Clay
contaminant transport diffusion coefficients heavy metals clay liner Ankara clay
2009/7/7
Diffusion and sorption of heavy-metal ions (Cd, Cr, Cu, Fe, K, Mn, Ni, Pb, and Zn) through an Ankara clay liner were studied experimentally. The Ankara clay consists of calcite, quartz, smectite and i...
Karst in Turkish Thrace: Compatibility between Geological History and Karst Type
cave karst morphology neotectonic palaeogeography Thrace Turkey
2009/7/7
Geographically, Thrace is a region located in southeastern Europe within the territories of Greece, Bulgaria and Turkey. In Turkish Thrace, karst occurs extensively in Eocene limestones, although som...
Lake Hazar Basin: a Negative Flower Structure on the East Anatolian Fault System (EAFS), SE Turkey
East Anatolian Fault System Lake Hazar basin negative flower structure Turkey
2009/7/7
The East Anatolian Fault System (EAFS) is a 30-km-wide, 700-km-long and NE-trending sinistral strike-slip megashear belt between the Anatolian platelet in the northwest and African-Arabian plates in t...
Late Ypresian to Middle Lutetian Orthophragminid Record From Central and Northern Turkey: Taxonomy and Remarks on Zonal Scheme
Turkey Eocene Discocyclinidae Orbitoclypeidae Biometry Evolution Zonation
2009/7/7
Orthophragmines are one of the commonest larger foraminifera in the late Paleocene-Eocene shallow-marine deposits of Turkey. Following several common lineages, such as Discocyclina archiaci, Orbitocly...
Trace Fossils of the Upper Eocene-Lower Oligocene Transition of the Manipur, Indo-Myanmar Ranges (Northeast India)
ichnological analysis Upper Eocene-Lower Oligocene Disang and Barail groups Manipur India
2009/7/7
A detailed ichnological analysis, for the first time, has been preformed on Upper Eocene-Lower Oligocene Transition of Manipur, Indo-Myanmar Ranges (Northeast India). Previous trace fossil analyses in...
Quaternary Calcrete Development in the Mersin Area, Southern Turkey
calcrete hardpan nodule pedogenesis Quaternary Turkey
2009/7/7
Quaternary calcretes are widespread in the Mersin area and occur in a variety of forms. Several distinct calcrete profiles are recognized and subdivided into two major groups defined by mature and imm...
研究探讨沉积物中钒、钼、铊和镓的生物地球化学行为对揭示海洋环境演变机制有重要的科学意义，基于此考虑，本文系统分析总结了近年来海洋沉积物中V、Mo、Tl和Ga的地球化学特征以及与环境关系的研究进展，以期对深入开展环境敏感微量元素的海洋生物地球化学有所裨益。结果表明，由于受人为输入的影响，近海沉积物中V、Mo、Tl和Ga含量高于远海，河口高于近海；在表层沉积物中，细颗粒沉积物中V、Mo、Tl和Ga含量...
酸不溶物对碳酸盐岩风化壳发育程度的影响
风化强度 不同母岩类型 贵州岩溶区
2010/12/10
通过对贵州岩溶区（包括湘西）不同地层系统碳酸盐岩发育的红色风化壳、以及结合本区和处于同一气候带的邻区不同岩类红色风化壳的对比研究，结果表明：（1）碳酸盐岩红色风化壳的发育程度明显受基岩酸不溶物成分的控制，酸不溶物的风化成熟度越高，红色风化壳的发育程度一般也越强。由于不同地层系统碳酸盐岩的酸不溶物组成不同，在此基础上发育的红色风化壳的风化强度自然存在着差异；（2）风化壳相对于母岩的进一步风化潜力或空...
贡献权重叠加法的滑坡危险度区划研究
权重 叠加 滑坡 区划
2013/9/25
介绍的贡献权重叠加的滑坡危险度区划方法,是基于GIS技术将环境本底因子对滑坡发育的贡献作用进行量化统计后,通过贡献率与权重的转换,分别计算这些因子的自权重和互权重,再与每一个因子叠加。该方法的特点是评价模型简单,选取的因子指标可以直接从数值图件和野外调查中获得,定量化效果明显。
在地面、钻孔中或空中，用综合地球物理勘探方法，测量各种物理场的变化，以研究水文地质条件，勘查地下水资源。简称地下水物探。常用的物探方法有自然电场法、电阻率法和浅层地震法。应用这几种方法的理论基础是：①自然电场法。地下水从山顶向山下缓慢流动时产生渗滤电场，形成山顶负的自然电位；硫化矿体在地下水位之上为氧化环境，在地下水位之下为还原环境，从而可在矿体顶部地面形成自然电场异常（见地电场）。②电阻率法。岩...