نتایج جستجو برای: tectonic origin
تعداد نتایج: 208579 فیلتر نتایج به سال:
A number of tectonic models have been proposed for the Tibetan Plateau, which origin, however, remains poorly understood. In this study, investigations of the shear wave velocity (Vs) and density (ρ) structures of the crust and upper mantle evidenced three remarkable features: (1) There are variations in Vs and ρ of the metasomatic mantle wedge in the hanging wall of the subduction beneath diff...
Early Cambrian volcanic rocks of the Posht-e Badam tectonic block in Central Iran which is hydrothermally altered to green color rocks, hosts the Kiruna-type Iron Oxide-Apatite (IOA) mineralization in Anomaly 10 of Sechahun deposit. Geochemically, these volcanic rocks are classified as high-potassium calc-alkaline and mainly consist of rhyolite and trachyandesite. These rocks are important for ...
Ellipsoidal huge granitoidic batholiths of Zahedan, with NW-SE trending, located in south of this city which is intruded in low metamorphosed Eocene flysches (eastern Iran flysch zone). This batholith has two compositional terms: an extensive intermediate-acid term includes diorite - granodiorite with igneous source (I- type origin) and a low extent crustal and hybrid origin acidic term (H-type...
Tectonic deformation in the ploins of Venus is pervasive, with virtually every area of the planet showing evidence for faulting or fracturing. l’his dcfonna[ion can bc classified into three general categories, deiined by the intensity and arcal extent of the surface deformation: distribolcd deformation, conccntramJ defon]lation, and local fracture ptittcrns. Each of these styles offers informfl...
Abstract The magmatic response above subducting ocean lithosphere can range from weak to vigorous and a narrow zone widely distributed. small young Cascade Arc, riding on the margin of tectonically active North American plate, has expressed nearly this entire volcanic activity. This allows an unusually good examination arc initiation early growth. We review tectonic controls Cascade-related mag...
In this research, due to the abundance of tectonic and karstic structures in the Prav Bisotun region, the relation between fault building and karstic springs was evaluated. To do this, we first prepare information layers including the location of the springs, the location of the closed holes, faults, the slope and the elevation floor layer, and then the graph of the grains of the faults is draw...
نمودار تعداد نتایج جستجو در هر سال
با کلیک روی نمودار نتایج را به سال انتشار فیلتر کنید