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2012 Vol. 23, No. 2

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Calcite Cements in Burrows and Their Influence on Reservoir Property of the Donghe Sandstone, Tarim Basin, China
Qi, Yongan; Wang, Min; Zheng, Wei; 等.
2012, 14(2) doi: 10.1007/s12583-012-0238-5
Abstract:
Abundant burrows of Skolithos Uncurls, Palaeophycus tubularis, and Taenidium barretti are preserved in the Upper Devonian Donghe sandstone of Tarim basin, China. They are commonly highlighted in core by the color of the burrow fill in contrast to the surrounding matrix and have different textures and fabrics from the matrix. There are three kinds of calcite cements in burrows, microcrystalline-crystalline calcite cement, mosaic calcite cement, and ferroan calcite cement. Microcrystalline-crystalline calcite cement is widely distributed in the lower part of the Donghe sandstone, but it is rare in burrows filling. It displays a globule structure under burial cementation and seldom replaces the ...
Timing of Precambrian Basement from East Segment of Tiekelike Tectonic Belt, Southwestern Tarim, China: Constrains from Zircon U-Pb and Hf Isotopic
2012, 14(2) doi: 10.1007/s12583-012-0239-4
Abstract:
This study focuses on the determination of the age and provenance of a Precambrian unit on the southwestern margin of the Tarim craton, collectively known as the Ailiankate (sic) Group and Sailajiazitage (sic) Group, which were previously referred to as Paleoproterozoic-Mesoproterozoic. Zircon U-Pb LA-ICP-MS dating of chlorite quartz schist and tuff that form the Ailiankate Group and Sailajiazitage Group have yielded age peaks at 780 and 787 Ma, respectively. These data indicate that the Ailiankate and Sailajiazitage groups are Neoproterozoic succession deposited at ca. 740-790 Ma. Those strata are temporally equivalent and are likely parts of a single wide spread succession and reflect a rifting...
Environmental Changes Recorded by Major Elements in Loulan Stupa Section during Early-Middle Holocene
2012, 14(2) doi: 10.1007/s12583-012-0240-y
Abstract:
Holocene palaeoweathering conditions and environmental changes of Loulan (sic) Stupa Section were reconstructed by major elements analysis results and optical stimulated luminescence dating results. Major element results show source rock change little, with the composition equivalent to granodiorite. The low R value and high CIA (chemical index of alteration) value indicating the section at primary weathering phases.
Cleaning of Marine Sediment Samples for Large Diatom Stable Isotope Analysis
2012, 14(2) doi: 10.1007/s12583-012-0241-x
Abstract:
Diatom stable isotope analysis offers considerable potential in palaeoceanography, particularly where carbonate material is scarce or absent. However, extracting pure diatom frustules free of external labile organic matter from marine sediments is an essential requirement for their applications as paleoenvironmental proxies. Here, based largely on previous work, we developed a method including physical separation and chemical oxidation steps to concentrate and clean pure large diatoms from laminated diatom mat and diatomaceous clay sediment samples for their stable isotope analysis. Using the physical separation techniques consisting ...
Calculation of Ground Rotational Motions Using Seismic Array Data
2012, 14(2) doi: 10.1007/s12583-012-0242-9
Abstract:
This article gives a description of our first study on ground rotational motion and its preliminary results. The ground rotational motions around vertical axis were obtained using near-field translational records of a temporal seismic array with observational distances of 1.8 to 2.7 km. The sources used are explosions with explosive of 500 kg for each. Ground rotational velocities were calculated using the space derivatives of the horizontal components of translational ...
Geochemical Analysis on Educts in the Drainage Corridor of a Big Dam over Yangtze River
2012, 14(2) doi: 10.1007/s12583-012-0243-8
Abstract:
The analysis of educts has become an important aspect for the security evaluation of hydraulic construction. Brown, white-based colloidal educts appeared in the left drainage corridors of the dam over the Yangtze River after its 5-year operation, which did not happen in the initial investigation. In this article, the physics characteristics of the educts were affirmed, and the analysis results of the major and trace elements among educts and the corresponding location of water samples, core samples, indicate that educts are the products from the chemical potential erosion of the dam foundation...
Landslide Reliability Analysis Based on Transfer Coefficient Method: A Case Study from Three Gorges Reservoir
2012, 14(2) doi: 10.1007/s12583-012-0244-7
Abstract:
To evaluate the reliability of a landslide in a reservoir, the universal transfer coefficient method, which is popularized by the Chinese standard, is adopted as performance function in this study for: (1) common deterministic method stability evaluation; (2) reliability evaluation based on a Monte Carlo method; (3) comparison of landslide reliability under different water levels and under different correlation coefficients between soil shear strength parameters (c, Phi), respectively with mean, standard deviation, reliability coefficient and failure probability...
From the Area to the Point-Study on the Key Technology of 3D Geological Hazard Modeling in Three Gorges Reservoir Area
2012, 14(2) doi: 10.1007/s12583-012-0246-5
Abstract:
Taking hundreds of pieces of hazardous geological maps (1: 10 000) of Three Gorges reservoir area (3GR) as background, we establish regional three-dimensional (3D) geo-hazard model using DEM (digital elevation model) superposed surface images and geo-hazards elements. Based on landslides and other geo-hazard survey data, using improved B-REP (boundary representation) entity ...
earch on the Distribution of Major Metal Elements in the Typical Landslide Soil of the Three Gorges Reservoir Area
2012, 14(2) doi: 10.1007/s12583-012-0000-0
Abstract:
In this article, a laboratory-built experimental system laser-induced breakdown spectroscopy (LIBS), is used to measure soil samples. It explores landslides band soil of five typical landslides in Xiangxi (sic) River Section of the Three Gorges Reservoir area, which include Bazimen (sic) landslide, Baijiabao (sic) landslide, Jiajiadian (sic) landslide, Sixiangxi (sic) landslide and an unnamed landslide...
Simulation of Hertz Transient Contact/Impact of Flexible Bodies
Bu Changgen; Xia Boru; Lian Yinjun; Zeng Hui
2012, 14(2) doi: 10.1007/s12583-012-0249-2
Abstract:
The transient response to longitudinal impact of flexible rods with Hertz contact is closely related to the extent of deformations with different impact parameters. By means of LS-DYNA, for different radius and different speeds, the longitudinal impact of a hammer with a rounded end on a drill rod is numerically simulated in this article. Simulations demonstrate that there is an obvious
Comprehensive Study of Landslides through the Integration of Multi Remote Sensing Techniques: Framework and Latest Advances
2012, 14(2) doi: 10.1007/s12583-012-0245-6
Abstract:
Detecting the timing and amount of deformation is critical for understanding the physical causes and eventually warning of possible landslide hazards. Monitoring of deformation of structures and ground surface displacements during landslides can be accomplished by using different types of systems and techniques. Besides geotechnical or physical techniques...
Lithological and Structural Control of Hattian Bala Rock Avalanche... Lithological and Structural Control of Hattian Bala Rock Avalanche Triggered by the Kashmir Earthquake 2005, Sub-Himalayas,
Mirza Shahid
2012, 14(2) doi: 10.1007/s12583-012-0248-3
Abstract:
The Kashmir earthquake 2005 (magnitude M-W 7.6) triggered thousands of mass movements in northern Pakistan. These mass movements were mainly rock falls, debris falls, rockslides and rock avalanches. The mass movements vary in size from a few hundred cubic meters up to about 100 million cubic meters estimated for the Hattian Bala rock avalanche, the biggest one ...
Comprehensive Determination of Reinforcement Parameters Comprehensive Determination of Reinforcement Parameters for High Cut Slope Based on Intelligent Optimization and
2012, 14(2) doi: 10.1007/s12583-012-0250-9
Abstract:
High cut slopes have been widely formed due to excavation activities during the period of immigrant relocation in the reservoir area of the Three Gorges, China. Effective reinforcement measures must be taken to guarantee the stability of the slopes and the safety of residents. This article presents a comprehensive method for integrating particle swarm optimization (PSO) and support vector machines (SVMs), combined with numerical analysis, to handle the determination of appropriate reinforcement parameters, which guarantee both slope