Results 91 to 100 of about 26,385 (251)
Литосфера, 2016 The composition of mineral associations was studied in the main varieties of the rocks within the metamorphosed Kandalaksha gabbro-anorthosite massif in the southern part of the Kola Peninsula.
V. V. Chashchin +4 more
doaj +2 more sources
The influence of water in silicate melt on aluminium excess in plagioclase as a potential hygrometer [PDF]
, 2018 Measuring water contents of magmas is fundamental to resolving a number of geological questions, such as the mechanisms of silicic magma evolution, the triggering of volcanic eruptions, and the formation of porphyry copper deposits. This study focuses on
Storck, Julian-C. +5 more
core +2 more sources
Boreas, EarlyView.The glacierized Valle Frías in Northern Patagonia is one of the best‐studied valleys in South America and includes varved sediments from Lago Frías. We complement this lacustrine record with a high‐resolution documentation of varve counts and their composition.
Bernd Zolitschka +6 more
wiley +1 more source
Geostandards and Geoanalytical Research, EarlyView.Key Points Higher laser repetition rate, fluence and larger spot size increase signal intensity. Higher laser repetition rate produces overlaps in aerosolised particles, improving signal stability and precision. For Sr‐rich materials, moderate spot diameter (≤ 60 μm), 3 J cm‐2 fluence and ≥ 12 Hz repetition rate are recommended.
Edafe O. Ominigbo +4 more
wiley +1 more source
Appraisal of Six Natural Mica Reference Materials for In Situ Rb‐Sr Geochronology
Geostandards and Geoanalytical Research, EarlyView.Key Points Evaluated six natural mica reference materials for in situ LA‐ICP‐MS/MS Rb‐Sr geochronology using geochemical, microstructural and isotopic characterisation. Identified robust primary reference materials: Mount Dromedary biotite (99.37 Ma) and Mica‐Fe biotite (307.75 Ma). La Posta biotite and Högsbo muscovite are suitable secondary reference
Hugo K.H. Olierook +38 more
wiley +1 more source
Vaporization experiments in the system plagioclase-hydrogen [PDF]
, 1989 P(論文)Vaporization experiments in the system plagioclase (An_)-hydrogen were carried out at temperatures between 1200 and 1475℃ and in the pressure range from 10^ to 10^ bar. After partial vaporization, originally homogeneous plagioclase became zoned with
Nagahara, Hiroko, Kushiro, Ikuo
core +1 more source
Journal of Petroleum Geology, EarlyView.ABSTRACT The diagenetic albitization of plagioclase and K‐feldspar grains is a transformative process that significantly alters sandstone's detrital composition and formation water chemistry, impacting reservoir quality. In this study, Eocene turbidite sandstones from the offshore Espírito Santo Basin, Brazil, were investigated to elucidate the role of
Eveline E. Zambonato +2 more
wiley +1 more source
A Decimal Grouping of the Plagioclases [PDF]
The Journal of Geology, 1917 perhaps because it has not been attempted; for, once the matter is given any critical attention, the most convenient and logical adaptation of current nomenclature seems rather easy to find. The ideal plan should, first, accord with the modern doctrine that the plagioclases form a continuous series; schemes that imply a limited number of compounds (Nos.
openaire +2 more sources
Meteoritics &Planetary Science, EarlyView.Abstract Shergottites are the most abundant meteorites from Mars and a major source of information on magma reservoirs, transport, and eruption, particularly in the late Hesperian northern hemisphere. Conflicting interpretations have arisen on the crystallization conditions of pyroxene in olivine‐phyric shergottites.
Roger H. Hewins +2 more
wiley +1 more source
Average structure of an An (sub 48) plagioclase from the Hogarth Ranges [PDF]
, 1986 The average structure (CI) of a volcanic plagioclase megacryst with composition Ano, from the Hogarth Ranges, Australia, has been determined using three-dimensional, singlecrystal neutron and X-ray diffraction data.
Parise, John B. +2 more
core