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2010 Vol. 21, No. 1

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Geological Evolution of Longhushan World Geopark in Relation to Global Tectonics
叶明和, 王军鹏, 王璐
2010, 12(1) doi: 10.1007/s12583-010-0009-0
The South China fold belt has experienced a complex series of tectonic events that span 1.0 billion years of earth history. Longhushan (龙虎山) World Geopark is located on the Proterozoic suture between the Yangtze craton and Cathyasia block and highlights the long history of this belt. Collision of the Cathyasia and Yangtze cratons 1.0 billion years ago was associated with the formation of the Rodinian supercontinent where most of the planet’s landmasses were amalgamated into one block. Jurassic through Early Cretaceous magmatism was associated with the inland migration of the continental margin arc associated with the penetration of a flat slab after subduction of the Kula-Farallon ridge...
Structural Styles of Longmen Mountain Thrust Belt, SW China
金文正, 汤良杰, 杨克明, 万桂梅, 吕志洲, 余一欣
2010, 12(1) doi: 10.1007/s12583-010-0010-7
Through field geological investigation and seismic interpretation of the Longmen (龙门) Mountain thrust belt, we summarized the following structural styles: thrust belt, fault-related fold (fault bend fold, fault propagation fold, and fault decollement fold), pop-up, triangle zone, duplex, superimposed fold, ductile deformation structures, reverse thrust fault, klippe, decollement structure,etc.. These structural styles have evident distri-bution characteristics; they had zonation and segmentation in plane. The zonation presents as the thrust nappe tectonic zone to the west of Tongjichang (通济场) fault, fault-related folds between Tongjichang fault and Guankou (关口) fault, and low and mild folds to the east of Guankou fault....
Static Stress Triggering Effects Related with Ms8.0 Wenchuan Earthquake
朱航, 闻学泽
2010, 12(1) doi: 10.1007/s12583-010-0001-8
In this article, firstly, we calculated and analyzed the patterns of Coulomb stress changes induced by a sequence of strong earthquakes that occurred in Songpan (松潘), Sichuan (四川) Province in 1973 and 1976, and discovered that the Ms8.0 Wenchuan (汶川) earthquake of 2008 was epicentered in a relevant Coulomb stress triggering zone. This suggests that the Coulomb stress on the middle and southern segments of the Longmenshan (龙门山) fault zone increased after the Songpan sequence of strong earthquakes, and the stress increment might cause the 2008 Wenchuan earthquake having already occurred somewhat ahead of time...
Biogenic Sediments and Their Paleoceanographic Implication in West Pacific Warm Pool during the Pleistocene
王汝建, 肖文申
2010, 12(1) doi: 10.1007/s12583-010-0002-7
Primary productivity has played an important role in the global carbon cycle during the Quaternary. The average Corg/N ratio was 7.0 from the core MD97-2140 in the West Pacific Warm Pool (WPWP) over the last 1 755 ka, which indicates a main contribution of marine organic carbon to the organic matter in the sediments. Large fluctuations in mass accumulation rates (MARs) of biogenics and lithogenics from this core since the marine isotope stage (MIS) 6 reflected the moderate variability in oceanographic condition, while little fluctuations in MAR-biogenics and -lithogenics from the MIS 59 to MIS 7 implied the relatively stable and uniform oceanographic condition, although the sea surface temperatures (SSTs) probably fluctuated by ca. 5 ℃. MAR-organic since the MIS 6 increased evidently during the glacial periods, which ascribed to terrestrial inputs, including lithogenic matter and dissolved nutrient, which also contribute to stimulating primary productivity...
Activity and Formation of Sand Waves on Northern South China Sea Shelf
栾锡武, 彭学超, 王英民, 邱燕
2010, 12(1) doi: 10.1007/s12583-010-0005-4
Sand waves on the northern South China Sea shelf had been considered as stable relict bed form. For the industry use of sea bed between stations LF13-2 and LF13-1, a new round of explorations were conducted. The newly obtained data show that both spacings and amplitudes of sand waves are all systematically changing with water depth. Repeated observations since 2003 to 2004 showed that the sea bed is currently active. Due to strong erosion of surface sediment since Dongsha (东沙) uplifting, there are almost no modern sediments on the shelf of Dongsha area. Sand materials in the study area mainly originate from the erosion of the bed sediment formation...
Tectonic Evolution and Hydrocarbon Potential in Northern Area of the South Yellow Sea
姚永坚, 陈春峰, 冯志强, 张拭颖, 郝天珧, 万荣胜
2010, 12(1) doi: 10.1007/s12583-010-0006-3
The northern area of the South Yellow Sea, located in the offshore region of China, resulted from the continental-continental collision orogeny during the Mesozoic and can be divided into four stages in terms of tectonic evolution: (1) pre-orogenic passive continental margin stage (Z–T2); (2) foreland basin stage corresponding with the late phase of the Sulu (苏鲁) orogeny (J3–K); (3) post-orogenic intracontinental rifted basin stage (K2t–E); and (4) regional subsidence and coverage stage (N–Q). Based on detailed investigation and study of the intracontinental rifted basin, hydrocarbon source rocks of Late Cretaceous Taizhou (泰州) Formation distributed well in the basin, and four reservoir-cap combinations as well as numerous trap structures were found. As a result, the geological conditions would be excellent for reservoir formation in the basin, and the oil resource amount is estimated at about 20×108 t, which makes the basin a major target for hydrocarbon exploration in the South Yellow Sea.
Complex Petroleum Migration and Accumulation in Central Region of Southern Junggar Basin, Northwest China
曹剑, 王绪龙, 魏东涛, 孙平安, 胡文瑄, 贾东, 赵应成
2010, 12(1) doi: 10.1007/s12583-010-0004-5
The central region of the southern Junggar basin (Northwest China) is a key exploration target in this petroliferous basin. As there are four sets of potential source rocks (e.g., Permian, Jurassic, Cretaceous and Paleogene sequences), petroleum migration and accumulation are likely complex. This study represents an attempt to understand this complexity in order to provide fundamental information for future regional petroleum exploration and geological studies. Based on petroleum geology and geo-chemistry, it is implied that there are mainly three types of hydrocarbons, including Cretaceous- and Paleogene-sourced oils (with the former being dominant) and Jurassic-sourced gas. The petroleum mi-gration and accumulation mainly cover three stages. The first stage is the late period of the Early Pleis-tocene, in which the Cretaceous-sourced oils migrate and accumulate...
Hydrocarbon Generation Evaluation of Permo– Carboniferous Source Rocks inQinggu-2 Well in Dongpu Depression, China
朱炎铭, 陈尚斌, 兰晓东, 王猛, 方俊华
2010, 12(1) doi: 10.1007/s12583-010-0007-2
The Dongpu (东濮) depression is a Mesozoic subsidence and Cenozoic fault basin developed within the North China craton. Since the deposition of Permo–Carboniferous hydrocarbon source rock, the depression has undergone many tectonic disturbances and uplifts. The source rocks have undergone nonuniform uplift, deformation, deep burying, and magmatism, and those led to an interrupted or stepwise evolution of the hydrocarbon source rocks in Qinggu (庆古)-2 well. We have investigated the history of burying, heating, and hydrocarbon generation of the Permo–Carboniferous hydrocarbon source rocks not just on the basis of tectonic disturbance and deep burying, but also with new studies in apatite fission track analysis, fluid inclusion measurements, and the application of the numerical simulation of EASY%Ro...
Characteristics of Landslides Induced by the Great Wenchuan Earthquake
唐辉明, 贾洪彪, 胡新丽, 李德威, 熊承仁
2010, 12(1) doi: 10.1007/s12583-010-0008-1
The great Wenchuan (汶川) earthquake induced a large quantity of landslides. They are widely distributed and caused tremendous damages. The sliding mechanism and characteristics of these earthquake-induced landslides are different from those of conventional gravity landslides. Their oc-currences are apparently controlled by the powerful earthquake, and they are characterized by high potential energy sliding and ejection sliding. In this article, the earthquake-induced landslides are clas-sified, the characteristics of the sliding and destruction of these landslides are described, and the rela-tionship between the earthquake and the landslides is analyzed...
Transformations between AeromagneticGradients in Frequency Domain
李海侠, 徐世浙, 余海龙, 魏巍, 房江奇
2010, 12(1) doi: 10.1007/s12583-010-0003-6
Aeromagnetic gradients are often used to enhance details or add new insights for interpretation. The gradients may be measured or derived from the total field or from transformation between horizontal and vertical gradients. At present, vertical, horizontal, and triaxial aeromagnetic gradiometers are in operation throughout the world, while the first two are used more widely. Transformations between horizontal and vertical gradients are needed for acquiring three gradient components or for checking the validity of measured gradients. Transformation of potential field by fast Fourier transform technique in frequency domain is popularly used; however, when applied to transforming between gradients, there is a problem that needs resolving...