440 research outputs found
Tectono-thermal evolution of the southwestern Alxa Tectonic Belt, NW China: constrained by apatite U-Pb and fission track thermochronology
No full textAbstract not availableDongfang Song, Stijn Glorie, Wenjiao Xiao, Alan S. Collins, Jack Gillespie, Gilby Jepson, Yongchen L
Continental accretion and intra-continental deformation of the Central Asian Orogenic Belt
No full textData for: Geochemistry and detrital zircon U-Pb dating of Plio-Pleistocene sandstones of the Chittagong Tripura Fold Belt (Bangladesh): Implications for provenance and tectonic setting
No full textGeochemical composition of sandstones from the Tipam and Dupi Tila sandstones of Bandarban and Sitapahar (Rangamati) structures, Chittagong Tripura Fold Belt (CTFB), Bengal Basin
Data for: Late Triassic ridge subduction of Paleotethys: insight from high-Mg granitoids in Songpan-Ganzi area of northern Tibet
No full textAbstractHighlightsManuscriptCover letterFig.1-8Supplementary Table 1-
Ordovician 40Ar/39Ar phengite ages from the blueschist-facies Ondor Sum subduction-accretion complex (Inner Mongolia) and implications for the early Paleozoic history of continental blocks in China and adjacent areas
No full textModeling the Adaptations of Agricultural Production to Climate Change
No full textThis reprint focuses on quantitatively assessing the impact of climate change on agricultural production based on multi-source model simulation and reveals the role and mechanism of improved management measures in adapting to climate change. Modeling is a key tool for exploring the impacts of climate change on agriculture and proposing adaptation strategies. The insights derived from this reprint will be helpful for relevant decision makers in the areas of agricultural adaptation and food security
Permian hornblende gabbros in the Chinese Altai from a subduction-related hydrous parent magma, not from the Tarim mantle plume
No full textTectonic and magmatic response to the subduction of high bathymetric relief
No full textSubduction of high bathymetric relief, such as aseismic ridges and magmatic plateaus, is considered to be responsible for dramatic changes in the dynamics and kinematics of the subduction zone. For example, the buoyancy of high bathymetric relief is thought to flatten the dip of the subducting slab, modifying the structural and magmatic evolution of the overriding plate and terminating arc volcanism. In addition, the effect of ridge subduction in retreating plate boundaries can inhibit subduction rollback, a process that could locally pin the subduction hinge and lead to the development of cusps and slab tearing. Here we discuss the tectonic response to subduction of high bathymetric relief using examples from the circum-Pacific subduction systems. We demonstrate that flattening of the subduction dip angle is only significant in the eastern Pacific, where the average slab dip angle is relatively shallow. In the western Pacific, in contrast, the average subduction dip angle is steeper and there is no significant flattening of the dip angle in areas of ridge subduction. Subduction of high bathymetric relief in the circum-Pacific is commonly associated with reduced arc volcanism, and in many cases, the area of ridge subduction coincides with a volcanic gap. In the overriding plate, ridge subduction is associated with pronounced changes in the style of deformation, involving uplift, reactivation of basement thrusts, development of orogen-perpendicular tear faults and block rotations leading to oroclinal bending. The discussed characteristic patterns associated with ridge subduction provide important guidelines for reconstructing past plate tectonic processes, and could help constraining the geodynamics of ancient subduction systems
Evolution of accretionary orogenic systems - the nature and geodynamics of the western Mongolian Altai
No full textLong-lived accretionary evolution of the Mongolian part of the Central Asian Orogenic Belt was intensively studied during the last decades, however, it is not completely known yet. Types of geodynamic processes forming this orogenic system and their timing are addressed through petrological, geochemical and/or sedimentological study combined with U-Pb zircon geochronology. The publications included in this thesis present research of two magmatic and one sedimentary system in the western Mongolia. Both the ancient magmatic complexes and sedimentary successions provide opportunity to study geotectonic evolution in a different way. Therefore, mutually combined results of these two geological disciplines allow more complex insight into the geodynamics of the region. The geochemical, isotopic and geochronological investigations of the high-grade basement complexes in the eastern Hovd Zone reveal an existence of the Early-Mid-Ordovician intra- oceanic arc and associated fore-arc volcano-sedimentary complex. The superimposed Mid- Silurian intra-plate magmatism is interpreted as a result of lithospheric thinning related to the same but already retreating subduction. Striking similarities of the studied basement with neighbouring Lake Zone margin suggest that the both units originally belonged to a single..
- …
