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Impact of the South Atlantic Opening on the Origin and the Tectonic of the Mamfe, Douala and Rio Del Rey Sedimentary Basins, Geodynamics Implication  [PDF]
Alain Rodrigue Nzeuga, Fran?oise Enyegueà Nyam, Robert Nouayou, James Derek Fairhead
Open Journal of Earthquake Research (OJER) , 2019, DOI: 10.4236/ojer.2019.84017
Abstract: The coastal and intracontinental sedimentary basins of Cameroon owe their origins to the opening of the South Atlantic. Among these sedimentary basins, we can mention those of Mamfe, Douala and Rio Del Rey, which are the subject of our current study. These were formed following geodynamic processes between the periods from the lower Cretaceous to the Neogene. These processes have significantly affected the basement of these basins leaving as consequences of multiple faults which would in their turn favor a rise of the magma towards the surface which then cooled to give birth to the volcanic rocks which exist there today. A study of the impact of the opening of the South Atlantic on the tectonics of these basins will be made from a geodynamic approach, relying in the first time on a qualitative and quantitative analysis of the anomaly map of the total magnetic intensity field reduced to the pole of each basin, then in a second time on the interpretation of the 2D geological models realized on a profile chosen on the anomaly map of the total magnetic intensity field reduced to the pole of each basin. At the end of this study, we will show that the opening of the South Atlantic has similarly impacted the structure of the three basins and the results of the spectral analysis show that the oceanic crust is thinner than the continental crust.
The Cenozoic tectonic-sedimentary evolution characteristics of sedimentary basins in middle Western Pacific

- , 2016, DOI: 10.7605/gdlxb.2016.03.031
Abstract: 西太平洋中段位于欧亚板块、太平洋板块和印度洋板块的交汇处,是全球沟弧盆体系最为发育的地区,主要发育弧后盆地、弧前盆地和陆架边缘盆地。文中通过综合研究西太平洋中段17个盆地的大地构造背景、盆地的形成与演化和沉积特征后认为:(1)各类盆地的构造-沉积演化均经历4个期次。弧前盆地和弧后盆地的构造-沉积演化可分为俯冲期(K2-E)、盆地发育期((N -N3)、沉降期(N4-N5)和挤压期(N2-Q):俯冲期发育火山岩和变质岩基底,局部为海相碎屑岩;盆地发育期以海相沉积为主,伴有火山活动,局部发育陆相沉积;沉降期以海相和三角洲相沉积为主;挤压期以三角洲相和海相沉积为主,局部发育河湖相沉积。陆架边缘盆地的构造-沉积演化也分为4期,分别为前裂陷期(K2-E1)、裂陷期(E2-(E3)、拗陷期(E32-N3)和沉降期(N4-Q):前裂陷期和裂陷期主要发育冲积扇—河流—湖泊沉积体系,火山活动强烈;拗陷期沉积环境由陆相向海陆过渡相演化;沉降期以海相和海陆过渡相沉积为主。(2)不同类型盆地的构造-沉积演化特征各不相同:弧前盆地构造以挤压和板块俯冲为主,平均沉积厚度为3.6,km,总体由海陆过渡相向陆相演化;弧后盆地构造受板块俯冲后撤和弧后洋壳扩张作用控制,平均沉积厚度为4.8,km,总体由海相向海陆过渡相演化;陆架边缘盆地构造呈下断上拗双层结构,平均沉积厚度超过10,km,总体由陆相演化为海相。
The middle Western Pacific is characterized by the trench-arc-basin system,because it is located in the junction area of the Euro-Asia Plate,the Pacific Plate and the India Plate. Three different types of basins developed in this area,including fore-arc basins,back-arc basins and continental margin basins. Based on the comprehensive study of tectonic environment,formation and evolution of the basins,and sedimentary characteristics of the seventeen basins in this area,we made the following conclusions.(1)All types of basins have experienced four stages of tectonic-sedimentary evolution. The tectonic-sedimentarg evolution of fore-arc basins and back-arc basins can be divided into subduction stage(K2-E),basin-forming stage((N-N3),subsidence stage(N4-N5)and compression stage(N2-Q): Volcanic rocks and metamorphic basement mainly developed in the subduction stage,with marine clastic rocks deposited in local areas. Marine sediments took dominance in the basin-forming stage,accompanied by volcanic activities and some local continental sediment. Marine facies and delta facies mainly developed in the subsidence stage and compression stage while local areas also developed fluvial and lacustrine facies in the latter stage. Meanwhile,that of continental margin basins can be divided into pre-rift
New method of physiographic zoning of Kaliningrad region  [PDF]
Lazareva N.
Vestnik Immanuel Kant Baltic Federal University , 2013,
Abstract: This paper introduces a new approach and criteria to the physical-geographical zoning of the Kaliningrad region. Landscape areas are identified according to their morphological structure. The article summarizes numerous publications and observation records, as well as the results of the author’s field studies.
Comments on tectonic-thermal evolution modeling of compressional basins

HUANG Xing-hui,SONG Hai-bin,

地球物理学进展 , 2009,
Abstract: Compression process has important effects on the formation and evolution of geological structures and sedimentary basins. Research on the tectonic-thermal evolution modeling of compressional basins has important significance to the better understanding of the stress distribution within the lithosphere, the mechanical property and the rheology of the lithosphere. In this paper, tectonic evolution simulation models of the compressional basins, including elastic model, viscoelastic model and elastic-plastic depth-dependent model, have been introduced briefly, then the comparisons of advantages and disadvantages, and applicabilities of these models are discussed. Methods used previously by some researchers in simulating thermal evolution of crustal uplifts are also mentioned. Although great advances have been made in the modeling of tectonic evolution of compression basins, the simulation of thermal evolution of these basins, on the other hand, is not good enough, which should be the research emphasis in future.
CT&F - Ciencia, Tecnología y Futuro , 2002,
Abstract: the natural processes that generate petroleum accumulations in a sedimentary basin require several ingredients: (1) the petroleum system elements: source, reservoir, seal and overburden rocks, which are the result of sedimentation processes in a subsiding basin; (2) petroleum traps, which in many cases are the result of deformation and (3) heat to convert suitable organic matter into petroleum. although these different phenomena are considered independent at the scale of an oil field, at the lithosphere scale (1) thermal phenomena, (2) vertical movements of the earth surface responsible for sedimentation and erosion; and (3) tectonic deformation are not independent phenomena, they are intimately related by physical quantitative laws. these mutual inter-relationships are useful in petroleum exploration to predict one factor having knowledge of the others. applications of these concepts can contribute to understand the tectonic history of complex areas, such as the colombian sedimentary basins, and reduce exploration risk.
Tectono-thermal modeling of sedimentary basins:review and outlook

HE Li-juan,WANG Ji-yang,

地球物理学进展 , 2007,
Abstract: Tectono-thermal modeling is one of the key methods to study the sedimentary basins,and the numerical models are dependent strongly on the dynamic mechanism of basin formation.Tectono-thermal modeling has achieved great success in describing the tectonic subsidence and heat flow of rift basins,where tectonic and thermal developments are linked perfectly.The foreland basin modeling is more concerned on tectonic subsidence rather than heat flow.There are still lack of mature models about cratonic basins,which tectono-thermal modeling is far behind from the rift and foreland basins.With the breakthrough of the petroleum exploration in marine-facies basins on land,study on their thermal regime is urgent. The marine-facies basins in China,such as the Tarim and Sichuan Basin,have experienced very long and complicated developments.They are superimposed basins by Paleozoic marine craton and Mesozoic-Cenozoic terrestrial forelands.The existed tectono-thermal models for non-superimposed basins are not applicable.Analyzing systematically the dynamics ofthese superimposed basins and developing appropriate numerical models for their tectono-thermal development will be a great challenge and possess innovative significance.
Implementing into GIS a Tool to Automate the Calculation of Physiographic Parameters of River Basins  [PDF]
Roberto Franco-Plata, Carlos Miranda-Vázquez, Héctor Solares-Hernández, Luis Ricardo Manzano-Solís, Khalidou M. Ba, José L. Expósito-Castillo
Open Journal of Modern Hydrology (OJMH) , 2013, DOI: 10.4236/ojmh.2013.32009
Abstract: The physiographic characterization of a basin is a fundamental element as it defines the hydrological behavior of that basin. The present work deals with the development and implementation of a tool that allows calculating in an automated manner the physiographic parameters of a basin, as well as those of the surface runoff and main river, besides other graphic elements: hypsometric curve, equivalent rectangle and profile of the main river. Such a tool was developed under Visual Basic 6 programming language and the spatial geographic component ArcObjects by ESRI; they enabled the development of a library as a final product (.dll), which can be loaded and implemented in ArcMap software. In the methodology a Conceptual Model was established, from which it was possible to identify the requirements and methods to obtain the parameters, as well as the conception and implementation of the Logical Model that includes the specific functions and also the input structures, processes and data output. Finally, the tool was tested with actual data from El Caracol river basin, located in central-southern Mexico, which showed the easiness and usefulness of it, besides the effectiveness of the results, not leaving aside the time and resources saved by the user when characterizing a basin, compared with other conventional processes.
Tectonic types and evolution of Ordovician proto-type basins in the Tarim region
DengFa He,XinYuan Zhou,ChaoJun Zhang,XiaoFa Yang
Chinese Science Bulletin , 2007, DOI: 10.1007/s11434-007-6010-z
Abstract: The Ordovician system is an important target for exploration in the Tarim Basin. Restoration of the Ordovician tectono-depositional environment is a key basis for the study of the structural development history in Tarim block and the prediction of the favorable Ordovician reservoir belts (zones). Based on the surrounding tectonic settings, the litho-facies and sedimentary fill, the palaeo-geography, palaeoclimate and palaeo-ecology, and the structural deformation and magmatic eruptions, in this paper we combine the sedimentary fill in the basin with the development of the surrounding orogenic belts and re-build the proto-type basins of the different Ordovician periods. During the Ordovician period, the Tarim region was characterized by the composite of the interior cratonic depression with the peripheral cratonic depression. The interior cratonic depression in the central and western parts is mainly the depositional area of the platform facies while the peripheral cratonic depression in the eastern part is mainly the zone of deepwater basin facies, with the slope acting as the transition belt between them. During the Late Ordovician period, the closure of the Northern Kunlun Ocean and destruction of the trench-arc-basin system in the Altyn Tagh region put the southern part of the Tarim block under compression and uplifting and turned the central and western parts of the carbonate platform into the mixed depositional continental shelf. The eastern region of the basin had the over-compensated flysch sedimentation with huge thickness, marking the drastic turn of the basin nature. The basin tectonic framework turned to the south-north differentiation of the Silurian period from the east-west differentiation of the Ordovician period.
Tectonic Zoning of Iran Based on Self-Organizing Map  [PDF]
A. Zamani,M. Nedaei,R. Boostani
Journal of Applied Sciences , 2009,
Abstract: In this study Self-Organizing Map (SOM) neural network has been applied for clustering of high-dimensional geological and geophysical data of Iran resulting numerical tectonic zoning. Visualization of high-dimensional data in two-dimensional topology-preserving feature map (visualization of clusters) and also visualization of component planes (visualization of variables) are the other specific capabilities of SOM used in this study. The component planes constructed here by SOM are successful in determining the effective parameters in tectonic zoning. Although, there are some compatibilities between numerical maps constructed here and the conventional maps but SOM provides more detailed identification and reliable interpretation about different zones. Based on the especial properties of SOM, some similarities and dissimilarities between different zones, despite of their geographical positions, have been revealed that not been noticed in conventional map previously. According to the results of this study SOM is a powerful and suitable method in tectonic zoning especially for regions where their tectonic regionalization is not well known.

ZHU Xia,

地球学报 , 1984,
Abstract: Some of the author's opinions during the past years concerning the tectonic evolution of China's petroliferous basins are, bound up with or inspired by the polycyclic tectonic theory founded by Prof. Huang Jiqing. In this paper the following points are discussed: 1. The preparatory stages of the Protoplatform, including the aulacogens on some early-stabilized cratons(e. g. the Sino-Korean) and the sedimentary depressions on others whose mobility was persisted to a much later time(e. g. the Yangtze), were also developed polycyclicly and their potentiality of oil and gas resources could not be overlooked. 2. The Mongolian geosynclinal foldbelts are intercontinental geosynclines, different in tectonic essentials from marginal geosynclines. Though small "oceanic basins" had existed here and there when the Protoplatform was disintegrated at different periods, the cycle of appearing of the oceanic crust, however, was short in time and restricted in space (Miyashiro). The opening and closing of the geosynclines behaved accordion-like in each cycle; and the uplifting and subsiding of the platforms with transgressions and regressions of seas were in tune with the geosynclines. It is under this geosyncline-platform tectonic regime that many Paleozoic petroliferous basins were developed polycyclicly within the platform or bordering the geosyncline. The author has proposed a classification scheme for them. 3. Prof. Huang's Pal-Asia of the late Variscan cycle is also related to the global tectonic event of the formation of Pangea B of Morel. The tectonic development from Late Carboniferous through Permian to Early Triassic (sometimes even to Early Jurassic), called by the writer "the transitional stage", though relatively short in time-span and relatively calm in regard to orogenesis and taphrogenesis as Prof. Huang pointed out, was, however,marked by the major transcurrent movements and the paradigm change of global thermal regime. The development of collapse basins (of which the Junggar is an example) on the Variscan foldbelts and the relative transgressive and extensile features on their borderlands and on the platforms are important factors in the assessment of Late Paleozoic-Early Mesozoic oil and gas basins. 4. Prof. Huang has stated that the Tethys was also developed polycyclicly since the Late Paleozoic and has given a clear picture of the "suture lines" with ophiolites from the south of the Kunlun to the Himalayas and their correspondent features in the western parts of Sichuan and Yunnan. In Prof. Huang's scheme each suture line is accompanied by a foldbelt on its southern side and with successively younger age to the south. In the writer's opinion, the thick marine sediments of these foldbelts may represent the passive margins of the Tethys oceanic crust when it was spreading asymmetrically in each cycle of development. In this respect, they should not be excluded from the future targets of oil and gas prospecting, although their state of deformati
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