منابع مشابه
Northwest Africa 1109 and Camel Donga: Metal-bearing Brecciated Eucrites
Introduction: HED (howardites, eucrites, diogenites) meteorites are the largest group of achondrites. HED meteorites are products of earliest magmatic activity in a large asteroid (4Vesta) 4.56 Ga ago. The textures and bulk compositions suggest that almost all HED meteorites experienced impact events shortly after the formation. Some polymict breccias of HED meteorites (e.g., polymict eucrites,...
متن کاملCosmic-ray Exposure Histories of Gas-rich Brecciated Meteorites
Introduction: Isotopic shifts in 150 Sm/ 149 Sm and 158 Gd/ 157 Gd caused by neutron capture effects are useful indicators to characterize the interaction of cosmic rays with planetary materials in space, because 149 Sm and 157 Gd have very large thermal neutron capture cross sections. A recent neutron capture study of the Sm and Gd isotopes of Pesyanoe also shows significant variations of neut...
متن کاملThe Origin and Composition of Pyrolusite Concretions in Hawaiian Soils!
THE SOILS of the drier regions of the Hawaiian Islands have a very high manganese content. Kelley ( 1909) has reported that certain darkcolored soils which are closely associated with the red soils have an Mna04 content ranging from 2.4 to .9.7 per cent. He has indicated the relationship between the poor growth of pineapples and the high manganese content of these soils (1909, 1910 ) : In a lat...
متن کاملClinical features and surgical outcomes of primary canaliculitis with concretions
The purpose of our study is to analyze the clinical, ultrasonic, microbiologic, and histopathologic characteristics, management, and outcomes in a series of primary canaliculitis with concretions patients who underwent canaliculotomy with curettage.Thirty-six patients were reviewed for age, sex, location and laterality, duration of symptoms, clinical symptoms, ultrasonic signs, result of microb...
متن کاملCalcium carbonate concretions formed by the decomposition of organic matter.
Bacterial decomposition of butterfish and smelts in small sealed jars containing seawater and other solutions, for periods ranging from 65 to 205 days, results in a large increase in concentrations of dissolved bicarbonate, carbonate, and ammonia (plus volatile amines). Accompanying this is a rise in pH and the precipitation of Ca(++) ion from solution. The Ca(++) is not precipitated as CaCO(3)...
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ژورنال
عنوان ژورنال: Geological Magazine
سال: 1869
ISSN: 0016-7568,1469-5081
DOI: 10.1017/s0016756800163174