نتایج جستجو برای: tethys
تعداد نتایج: 784 فیلتر نتایج به سال:
The Ordovician System, cropping out in southern and west-central Jordan, consists entirely of a 750 m thick clastic sequence that can be subdivided into six formations. The lower Disi Formation starts conformably above the Late Cambrian Umm Ishrin Formation. According to Cruziana furcifera occurring in the upper third of the Disi Formation, an Early Ordovician age is con®rmed. The Disi Formatio...
Abstract Metabasic rocks of the ophiolitic sequences Glockner Nappe and Eclogite Zone in south-central Tauern Window, Austria, reveal important insights into rifting spreading Alpine Tethys. U–Pb dating magmatic zircons yields a concordant 157 ± 2 Ma crystallization age for precursor coarse-grained metagabbro from Nappe. The Late Jurassic intrusion is coeval with mafic plutonic activity Western...
introduction the occurrence of blueschist metamorphic facies is believed to mark the existence of former subduction zones. this facies is represented in the main constituents of subduction-accretion complexes, where it occurs in separate tectonic sheets, imbricated slices, lenses, or exotic blocks within a serpentinite mélange (volkova et al., 2011). the evidence of the presence and maturity of...
Albedo, spectral slopes, and water ice band depths maps for the five midsized saturnian satellites Mimas, Enceladus, Tethys, Dione, Rhea have been derived from Cassini-Visual Infrared Mapping Spectrometer (VIMS) data. The are systematically built photometric corrected data by applying Kaasalainen-Shkuratov model (Kaasalainen et al., 2001; Shkuratov 2011). In this work a quadratic function is us...
Fossils discovered in Lower Cretaceous (Aptian) rocks in the Tenere Desert of central Niger provide new information about spinosaurids, a peculiar group of piscivorous theropod dinosaurs. The remains, which represent a new genus and species, reveal the extreme elongation and transverse compression of the spinosaurid snout. The postcranial bones include blade-shaped vertebral spines that form a ...
The Early Cretaceous Greater Ontong Java Event in the Pacific Ocean may have covered ca. 1% of the Earth's surface with volcanism. It has puzzled scientists trying to explain its origin by several mechanisms possible on Earth, leading others to propose an extraterrestrial trigger to explain this event. A large oceanic extraterrestrial impact causing such voluminous volcanism may have traces of ...
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