منابع مشابه
Rises, Trenches, Great Faults, and Crustal Blocks
The transform fault concept is extended to a spherical surface. The earth's surface is considered to be made of a number of rigid crustal blocks. It is assumed that each block is bounded by rises (where new surface is formed), trenches or young fold mountains (where surface is being destroyed), and great faults, and that there is no stretching, folding, or distortion of any, kind within a given...
متن کاملIdentification of Primary Noachian Crustal Blocks on Mars with Crism
Introduction: The nature, origin and evolution of Mars' Noachian crust is relatively unknown [1]. Detailed analyses of meteorites point to an early differentiation event for the planet but the only rock definitively of Noachian age is the Martian meteorite; ALH84001, comprised of >95% orthopyroxene [2]. Our understanding of the composition of the Martian crust is derived mostly from Amazonian-a...
متن کاملThe Crustal Structure
This thesis consists of three papers examining problems related to the crustal structure, isostasy and subsidence history of aseismic ridges and mid-plate island chains. Analysis of gravity and bathymetry data across the Ninetyeast and eastern Walvis Ridges indicates these features are locally compensated by an overthickening of the oceanic crust. Maximum crustal thicknesses are 15-30 km. The w...
متن کاملCrustal - Contaminated Melts ?
CRUSTAL-CONTAMINATED MELTS ? J. A. Barrat 1 , A. Yamaguchi, R.C. Greenwood, M. Bohn, J. Cotten, M. Benoit and I. A. Franchi, UBO-IUEM, CNRS-UMR 6538, Place Nicolas Copernic, F-29280 Plouzané Cedex ([email protected]), Antarctic Meteorite Research Center, National Institute of Polar Research, 1-9-10 Kaga, Itabashi, Tokyo 173-8515, Japan. PSSRI, Open University, Walton Hall, Milton Keynes MK7 ...
متن کاملEclogite-facies metamorphism preserved in tectonic blocks from a lower crustal shear zone, central Transantarctic Mountains, Antarctica
In the Geologists and Miller Ranges of the central Transantarctic Mountains, mafic and ultramalic tectonic blocks occur in an Early Cambrian amphiboliteto granulite-facies lower crustal transpressional shear zone. Mafic blocks consist of garnet + clinopyroxene symplectite + hornblende + plagioclase + quartz + ilmenite f orthopyroxene f biotite;mineral compositions in these blocks generally refl...
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ژورنال
عنوان ژورنال: Proceedings of the Imperial Academy
سال: 1938
ISSN: 0369-9846,1881-1140
DOI: 10.2183/pjab1912.14.137