The 53Mn-53Cr isotope systematics in ordinary chondrites constrains the accretion and thermal history of their parent bodies. Mineralogical observations olivine-spinel geothermometry suggest that chromite formed during prograde metamorphism with amount increasing petrologic grades type 3 to 6 chondrites. Assuming a chondritic evolution respective bodies, 53Cr/52Cr model ages for range from 3.99...

The study area is located about 110 kilometers southeast of Mashhad and approximately 40 kilometers southeast of Fariman. The area is considered to be a part of the central Iran zone. It includes metamorphic rocks with different protoliths consisting of pelitic, carbonate and quartz - feldspathic rocks. The metamorphism in the study area is considered to be a contact regional metamorphism with ...

High-resolution numerical simulations of galaxy mergers are analysed. The global structure and isophotal shapes of the merger remnants are in good agreement with the observations. Whereas equal-mass mergers lead to anisotropic, boxy ellipticals, unequal-mass mergers result in disky and isotropic systems. The line-of-sight velocity distributions show small deviations from a Gaussian distribution...

Summary Until now, the polar motion resonance (PMR) complex frequency has been determined in seasonal and retrograde diurnal band of motion. In this study, is studied prograde band, where mainly composed periodic terms caused by oceanic tide. The parameters (period quality factor) are encompassed transfer function between generating tidal potential motion, can be estimated accordingly. To aim, ...

Abstract Topographic form stress (TFS) plays a central role in constraining the transport of Antarctic Circumpolar Current (ACC), and thus rate exchange between major ocean basins. generation ACC has been linked to formation standing Rossby waves, which occur because current is retrograde (opposing direction wave propagation). However, it unclear whether TFS similarly retards systems that are p...