检索结果-南通市图书馆

Structural and Tectonic Evolution of El-Faiyum Depression,North Western Desert,Egypt Based on Analysis of Landsat ETm+,and SRTm Data

在线全文

学校读者我要写书评

暂无评论

Journal of Earth Science 2011年第1期22卷 75-100页

作者： timothy m Kusky Talaat m Ramadan mahmoud m Hassaan Safwat Gabr Three Gorges Research Center for Geo-hazard State Key Laboratory of Geological Processes and Mineral Resources China University of Geosciences The Geological Applications and mineral Resources Division National Authority for Remote Sensing and Space Sciences (NARSS) Cairo Egypt

False color Landsat ETm＋（bands 7, 4, 2 in RGB） and SRTm images of the EI-Faiyum depression, Egypt, highlights major NE-SW faults and other lineaments trending NW-SE and N-S. Airborne magnetic data reveal some E-W subsurface faults which are not recognized on Landsat ETm＋ and SRTm images. Ratio images （5/7, 3/1, 4/3） and （5/7, 5/1, 4） were used for lithological discrimination of different rock types. The EI-Faiyum area is occupied by sedimentary rocks of middle Eocene, Upper Eocene, Oligocene, Lower miocene, Pliocene, Pleistocene and Holocene. Understanding the structural regime of EI-Faiyum depression in the Western Desert of Egypt is significant in relation to the neotectonics of the Nile Delta and to the development of new communities west of the delta. The area is covered by Late Cretaceous, middle to Late Eocene deposits, Oligocene deposits （comprising fluviatile sediments and basalt sheets） and Pliocene and Quaternary alluvium and sand deposits. New geological and structural maps were prepared at a scale of 1 ： 100 000 using Landsat ETm＋ and SRTm images coupled with extensive field work. The major structural trends are E-W, ENE, NS and NW--the same trends observed elsewhere in North Africa from NW Sudan to NE Egypt including north and central Sinai. EI-Faiyum depression is a structurally-controlled tectonic basin, marked by northeast-striking faults along its northern margin. These faults are parallel to similar faults of the Syrian arc fold belt, which includes a group of related faults, folds, push-up structures, and basins. Qarun Lake is located in the northern part of EI-Faiyum depression, at a right-step between two strands of the NE striking fault system. We have suggested elsewhere that EI-Faiyum depression is a pull-apart basin related to extension between these mismatched strands of strike-slip faults. The E-W structures are probably related to the relative motion between south Europe and north Egypt and closure of the Neotethys. The continuation of t

关键词： Egypt EI-Faiyum Syrian arc fold belt pull-apart basin Western Desert of Egypt.

Geomorphometric Evidence of an Active Pop-up Structure along the Sabzpushan Fault Zone,Zagros mountains,SW Iran

在线全文

学校读者我要写书评

暂无评论

Journal of Earth Science 2016年第6期27卷 945-954页

作者： Ali Faghih Iman Nezamzadeh timothy m.Kusky Department of Earth Sciences College of SciencesShiraz University State Key Laboratory for Geological Processes and mineral Resources Three Gorges Research Center for GeohazardsMinistry of EducationChina University of Geosciences Center for Global Tectonics School of Earth SciencesChina University of Geosciences

Evaluation of active tectonism by means of geomorphic indices has provided crucial semi-quantitative data for evaluating seismic hazards in a fault zone in a semiarid area of the Zagros mountains of Iran where tectonic rates are low-to-moderate and there are few Quaternary dates. Quaternary activity along the seismically active but poorly understood Sabzpushan fault zone （SFZ） has been investigated. The SFZ consists of two dextral strike-slip faults, the Zafarabad and Kafari faults. Geomorphic indices including mountain front sinuosity, valley asymmetry factor, hypsometric integral, valley floor width to valley height ratio and stream length gradient index were used to assess the effects of active reverse faults which control the topographic relief and Quaternary activity. Geomorphometric and field evidence reveal that the Quaternary activity and topographic relief of the study area are controlled by two reverse faults, the North and South Sabzpushan reverse faults, which have formed a pop-up structure in the contractional step-over area between the Zafarabad and Kafari dextral strikeslip faults as a consequence of oblique convergence between the Afro-Arabian and Iranian plates accommodated by the North and South Sabzpushan thrust faults.

关键词： active tectonics geomorphic indices Sabzpushan fault zone pop-up structure Zagros Iran.

GIS-Based Analysis of Relative Tectonic Activity along the Kazerun Fault Zone, Zagros mountains, Iran: Insights from Data mining of Geomorphic Data

在线全文

学校读者我要写书评

暂无评论

Journal of Earth Science 2015年第5期26卷 712-723页

作者： Ali Faghih Ahmad Nourbakhsh timothy m.Kusky Department of Earth Sciences College of Sciences Shiraz University Three Gorges Research Center for Geo-hazard Ministry of Education China University of Geosciences

This paper tests a data mining method for evaluation of the ＂IRTA＂（Index of Relative Tectonic Activity） to investigate the impact of active tectonics on geomorphic processes and landscape development. Based upon K-means clustering of six basin-related geomorphic indices（the hypsometric integral, basin asymmetric factor, drainage density, basin shape ratio, mean axial slope of the channel and topographic roughness） that represent the relative strength of active tectonic deformation on topography and morphology, the relative tectonic activity along the Kazerun Fault Zone in the Zagros mountains of Iran may be classified into low, moderate and high relative tectonic activity zones. The results allow the identification of the clusters of similarly deformed areas related to relative tectonic activity. The utilization of geomorphic parameters as well as IRTA with comparison to the field observations exhibit change in relative tectonic activities mostly corresponding to the change in mechanism of the prominent fault zones in the study area.

关键词： active tectonics geomorphic index K-means clustering Kazerun Fault Zone Zagros Iran

Tertiary and Quaternary marine Terraces and Planation Surfaces of Northern Oman:Interaction of Flexural Bulge migration Associated with the Arabian-Eurasian Collision and Eustatic Sea Level Changes

在线全文

学校读者我要写书评

暂无评论

Journal of Earth Science 2016年第6期27卷 955-970页

作者： Ye Yuan timothy m.Kusky Sankaran Rajendran State Key Laboratory for Geological Processes and mineral Resources Three Gorges Research Center for GeohazardsMinistry of EducationChina University of Geosciences Center for Global Tectonics School of Earth SciencesChina University of Geosciences Department of Earth Sciences Sultan Qaboos University

The northeastern Arabian passive margin is being subducted beneath the Zagros and makran of Iran. A flexural bulge related to the weight of the makran has migrated at 4 cm/a through the previously uplifted Hajar mountains of Oman as this active convergence and collision between Arabia and Eurasia progresses, adding approximately another 500 meters of relief, and forming a series of uplifted marine terraces, alluvial terraces, and planation surfaces that record the passage of the bulge. We use a combination of field studies, remote sensing and GIS to map and better-understand these terraces, and elucidate how the tectonics of bulge migration, down-to-trench normal faulting, and eustatic sea level changes have interacted to produce the extant geomorphic features on the inner slope of the flexural bulge as it sinks into the foredeep of the Gulf of Oman. We speculate those terraces that were uplifted on the outer slope of the forebulge as it initially migrated through the passive margin （affected by ophiolite obduction in the Cretaceous） 3.75-7.5 ma ago are now sinking on the inner slope of the forebulge （corresponding to the outer trench slope in the foredeep）, and have been partly covered by Quaternary marine terraces related to a Weichselian sea level high stand. Both the Tertiary and Quaternary terraces are cut by faults related to the active collision, confirming that there is a significant risk of moderate earthquakes in the region.

关键词： marine terraces flexural bulge Arabia-Eurasia collision Sultanate of Oman remote sensing image processing Quaternary sea level fluctuation.

Why 2022 is a revolutionary year for potato genomics

在线全文

学校读者我要写书评

暂无评论

molecular Plant 2022年第8期15卷 1257-1259页

作者： m.timothy Rabanus-Wallace Nils Stein Leibniz Institute of Plant Genetics and Crop Plant Research(IPK) Stadt SeelandGermany Center for Integrated Breeding Research Georg-August-University Gottingen37075 GottingenGermany

While the humble spud may seem simple enough boiled on a plate,a lot of thought and effort goes into producing the varieties we like to *** lovers are conservative:the Russet Burbank,for instance,has produced our favorite French fries since 1902(Bethke et al.,2014).Cultivars need to be genetically stable-a state that is achieved in self-pollinating crop species like wheat and barley by repeated inbreeding.

关键词： favorite varieties instance

Geological Evolution of Longhushan World Geopark in Relation to Global Tectonics

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Earth Science 2010年第1期21卷 1-18页

作者： timothy m Kusky 叶明和王军鹏王璐 Three Gorges Research Center for Geo-hazards Ministry of Education and State Key Laboratory of Geologic Processes and Mineral ResourcesChina University of Geosciences Longhushan Administrative Committee Planning Bureau of Yingtan City Faculty of Earth Sciences China University of Geosciences Three Gorges Research Center for Geo-hazards Ministry of EducationChina University of Geosciences College of marine Geosciences Ocean University of China

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. Slab roll-back in the Early to middle Cretaceous opened many extensional basins across the South China fold belt, including the Xinjiang （信江） basin in which Longhushan is located, and these were filled largely with continental red beds deposited by fluvial systems in the hot torrid climate. The beds are richly fossiliferous, including remains of many dinosaurs and dinosaur eggs. Subduction of the Kula-Pacific plate in the middle Cretaceous caused a short magmatic pulse, and then, the basins subsided slowly through the remainder of the Cretaceous. Cenozoic uplift of the red bed basins was initiated by the India- Asia collision. The uplift was associated with the formation of many faults, joints, and brittle structures that dissected the red bed deposits. Fluvial erosion of the red beds was enhanced along the brittle structures, and different locations have developed very distinctive and structuraliy controlled geomorphological features including mesas, kopjies, and isolated stone peaks that are known in China as Danxia （丹霞） land-forms. Together, these features form Danxia landscapes, and Longhushan World Geopark exhibits a complete range of the Danxia landscapes from juvenile, to mature and to old stages of development. The United Nations Educational, Scientific, and Cultural Organiz

关键词： Longhushan Cathyasia South China fold belt Danxia red bed ridge subduction.

Lithospheric Structure in the North China Craton Constrained from Gravity Field model(EGm 2008)

在线全文

学校读者我要写书评

暂无评论

Journal of Earth Science 2011年第2期22卷 260-272页

作者：李媛媛杨宇山 timothy m Kusky Institute of Geophysics & Geomatics China University of Geosciences State Key Laboratory of Geological Processes and mineral Resources Three Gorges Research Center for Geo-hazardChina University of Geosciences

A detailed knowledge of the thickness of the lithosphere in the North China craton（NCC） is important for understanding the significant tectonic reactivation of the craton in mesozoic and *** achieve this goal by applying the newly proposed continuous wavelet transform theory to the Gravity Field model（EGm 2008） data in the *** structural variations are identified in the scalogram image of profile Alxa-Datong（大同）-Qingdao（青岛）-Yellow Sea（profile ABC）,trans-versing the main units of NCC,which we interpret as mainly representing the moho and lithosphere-asthenosphere boundary（LAB） *** imaged LAB is as shallow as 60-70 km in the south-east basin and coastal areas and deepens to no more than 140 km in the northwest mountain ranges and continental interior.A rapid change of about 30 km in the LAB depth was detected at around the boundary between the Bohai（渤海） Bay basin（BBB） and the Taihang（太行） mountains（Tm）,roughly coincident with the distinct gravity decrease of more than 100 mGal that marks the North-South Grav-ity Lineament（NSGL） in the *** last we present the gravity modeling work based on the spectral analysis results,incorporating with the observations on high-resolution seismic images and surface *** observed structural differences between the eastern and western NCC are likely associ-ated with different lithospheric tectonics across the *** with seismic tomography results and geochemical and petrological data,this sug-gests that complex modification of the litho-sphere probably accompanied significant litho-spheric thinning during the tectonic reactivation of the old craton.

关键词： EGm 2008 geopotential model,continuous wavelet transform Bouguer gravityanomaly constrained gravity field modeling,North China craton (NCC).

Coordination chemistry of surface-associated ligands for solid-liquid adsorption of rare-earth elements

在线全文

学校读者我要写书评

暂无评论

Journal of Rare Earths 2023年第1期41卷 1-18页

作者： Jessica L.Hovey timothy m.Dittrich matthew J.Allen Department of Chemistry Wayne State University5101 Cass AvenueDetroitMI48202USA Department of Civil and Environmental Engineering 5050 Anthony Wayne DriveWayne State UniversityDetroitMIl48202USA

General guidelines for the design of ligands for the enrichment of rare-earth elements by solid-liquid adsorption are described using coordination *** properties of ligands include selectivity of metal ions based on adjustment of donor atom polarizability,denticity,and the pKarange of the binding *** selectivity of solid-phase materials for the enrichment of rare-earth ions by the ligand design guidelines is outlined,with special consideration of additional variable factors including steric hindrance,saturated binding sites,variability in speciation caused by the identity of counterions and ionic strength,and size-exclusivity in ligands stemming from differences in bite angle,preo rganization of ligands,or intraligand *** review analyzes some principles of selectivity of rare-earth elements with ligands organized by donor type from examples collected from reports published between 2009 and 2021.

关键词： Chelating ligand Coordination chemistry Solid-phase material Rare-earth element Separation Solid-liquid extraction

The BRICS and Beyond： Insights into Human Development/Security from ＂Global Governance＂？

在线全文

学校读者我要写书评

暂无评论

Fudan Journal of the Humanities and Social Sciences 2014年第3期7卷 381-394页

作者： timothy m. Shaw mcCormack Graduate School University of Massachusetts Boston 100 Morrissey BoulevardBoston MA 02125-3393 USA

The decade of the BRICS is leading to the reanalysis of global relations, encouraged by the simultaneous rise of emerging markets and decline of the eurozone PIIGS. But is the trajectory towards global reorder and/or disorder？ Development like capitalisms and regionalisms is increasingly diverse： heterogeneous transnational networks best approached through a global studies frame？ Together these factors impact the balance between developmental and fragile states in African as elsewhere. And there are debates about what is emerging： companies？ econo- mies？ states？ and/or societies？ meanwhile, the ＂global＂ increasingly includes informal and illegal economies, especially TOC, including transnational Chinese mafias. Transnational governance continues to widen its scope to include airline and container alliances as well as a trio of commissions on drugs.

关键词： BRICS Development Global governance Regionalisms. Transnational