نتایج جستجو برای: basement tectonics
تعداد نتایج: 16212 فیلتر نتایج به سال:
Earth is the only known planet with subduction zones and plate tectonics, and this fact demonstrates that special conditions are required for this mode of planetary heat loss. Sinking of cold, dense lithosphere in subduction zones is the principal plate-driving force, so plate tectonics could not have begun until Earth cooled sufficiently to allow lithosphere to collapse into the underlying ast...
The inception of plate tectonics on Earth and its subsequent evolution are discussed on the basis of theoretical considerations and observational constraints. The likelihood of plate tectonics in the past depends on what mechanism is responsible for the relatively constant surface heat flux that is indicated by the likely thermal history of Earth. The continuous operation of plate tectonics thr...
On September 5–7, 2018, a series of tremors were reported in Nigeria’s capital city, Abuja. These events followed growing list felt the stable intraplate region, where earthquakes are not expected. Here, we review available seismological, geological, and geodetic data that may shed light on origin these tremors. First, investigate seismic records for parent location orphan using technique suita...
New Horizons images of Pluto's companion Charon show a variety of terrains that display extensional tectonic features, with relief surprising for this relatively small world. These features suggest a global extensional areal strain of order 1% early in Charon's history. Such extension is consistent with the presence of an ancient global ocean, now frozen.
Tectonic structures controlling mineralization in some parts of Southeast Nigeria were evaluated using airborne potential field data. High- and low-frequency filters depth determination tools adopted to evaluate short- long-wavelength anomalies, resolve the spatial spreading igneous intrusions, depths geologic sources basin topography. The high-frequency results exhibited high concentration sho...
Background and Objective: Previous studies showed that basement membrane pattern is structuraly different in SCC and BCC tumors. BSCC is an epithelial malignant tumor with two histopathologic pattern similar to SCC and BCC. This study was aimed to compare the basement membrane pattern in SCC , BCC and BSCC tumors . Materials and Methods: In this laboratory study, the medical files of patients...
We document the role of sedimentary burial and salt tectonics in controlling deformation style continental crust during hyperextension. The Iberian-European boundary records a complex history Cretaceous extension, which has led to development so-called smooth-slope type basins. Based on review available geological constraints (crustal-balanced cross-sections, profile evolution, RSCM thermometer...
This overview addresses uranium ore deposition and classification, mining refining of are briefly given. The main properties primary secondary minerals reported. surficial deposits account for approximately 4% world resources, defined as young uraniferous sediments soils - Tertiary to Recent near surface. major controlling factors effect the distribution reported in details such : climate, sour...
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