نتایج جستجو برای: tethys
تعداد نتایج: 784 فیلتر نتایج به سال:
[1] We use limb profiles to quantify the long‐wavelength topography of the Saturnian satellites. The degree 2 shapes of Mimas, Enceladus, and Tethys are not consistent with hydrostatic equilibrium. We derive 2‐D topographic maps out to spherical harmonic degree 8. There is a good correlation with topography derived from stereo techniques. If uncompensated, topography at degree 3 and higher is l...
Late Triassic plant macro-remains are extremely rare in an equatorial belt stretching across the North of Gondwana from northern South America to Arabia. Located between Laurussian floral province and South, this large area, is almost entirely lacking palaeobotanical data. Thus, region special interest our knowledge provincialism distribution. Based on impressions ferruginous crusts, first reco...
A new fossil species of the iphiculid genus Iphiculus Adams & White, 1849, (Crustacea, Brachyura) is described on the basis of three specimens from the Middle Miocene Florian Beds of Styria, Austria. Iphiculus eliasi sp. nov. constitutes the first European record of the genus. This occurrence represents the oldest record of Iphiculus, having implications for the palaeobiogeographic history of t...
1. Dynamics of Earth and evolution. One of the reasons that evolution is hard to think about is because of the vast times involved in evolutionary processes. One of the more interesting things we have to remember is the interplay between the dynamics of the earth and the dynamics of the living organisms on earth. For example, think about the consequences of the closing off of the Isthmus of Pan...
The Darvazeh-Chenar mafic- ultramafic body is part of ophiolitic complex of Neyriz in Fars Province that formed in association with closing of Neo-Tethys Ocean and Arabian- Iranian plate collision in Cretaceous. The Faryab ophiolitic rocks are also remnant of block of Tethys oceanic crust that were obducted on continental margins in late Cretaceous period. MgO, Fe2O3, Al2O3, Cr2O3 and TiO2 cont...
The Late Cretaceous is marked by geodynamical changes including Africa-Eurasia convergence that resulted in the narrowing of Tethys Ocean and ophiolite obduction along southern margin various continental blocks eastern Tethys. Geochemical mineralogical analyses were performed on Shahneshin section (Zagros Basin - Tethys), to explore consequences this evolution oceanic circulation, estimate role...
During the Permian, major icehouse-greenhouse climate shifts and tectonic reconfiguration had important biogeographic implications, especially for climate-sensitive organisms such as fusulinids. Here we present multivariate methods on a global fusulinid species dataset including 1546 from 58 localities in Early (Asselian, Sakmarian, Artinskian Kungurian) Middle (Roadian, Wordian Capitanian) Per...
The study area is located in northeastern Iran (south of Mashhad). Paleo-Tethys Ocean opened during Silurian time and subduction under Turan plate was started in Late Devonian. By Late Triassic (225 Ma) there was no Paleo-Tethys left on an Iranian transect, therefore Turan plate obducted over Iran Plate. Two stages of low grade regional metamorphism are exposed, that are related to Hercynian (L...
Ophiolitic rocks in the southeastern part of the Zagros Orogenic Belt can be separated from southwest to northeast, into two groups: the Neyriz ophiolites and the Naien–Shahrebabak–Baft ophiolites. The southeast sector of Sanandaj-Sirjan wasdelimited by the two nearly synchronous ophiolitic belts in its southwestern and northeastern margins. In this study, new ophiolitic formation models were u...
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