Arran pitchstone (Scottish volcanic glass): New dating evidence
نویسندگان
چکیده
منابع مشابه
Water in volcanic glass: From volcanic degassing to secondary hydration
Volcanic glass is deposited with trace amounts (0.1–0.6 wt.%) of undegassed magmatic water dissolved in the glass. After deposition, meteoric water penetrates into the glass structure mostly as molecular H2O. Due to the lower dD (‰) values of non-tropical meteoric waters and the 30‰ offset between volcanic glass and environmental water during hydration, secondary water imparts lighter hydrogen ...
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Volcanic ash is fragments of magma, and consists of minerals and volcanic glass. These materials in the ash can provide important information on the nature of the magma, because chemical compositions of magma usually show distinct features in each volcano, and because assemblages and compositions of minerals reflect their host melt. Using assemblages and chemical compositions of minerals and gl...
متن کامل(U–Th)/He dating of volcanic phenocrysts with high-U–Th inclusions, Jemez Volcanic Field, New Mexico
We measured (U–Th)/He ages of fayalite and hedenbergite phenocrysts with britholite and chevkinite inclusions from the ~1.6 Ma Otowi (Lower) Member of the Bandelier Tuff, Jemez Volcanic Field. U and Th, the major parent nuclides of radiogenic He, are concentrated in britholite and chevkinite inclusions and are essentially absent from the host grains. We analyzed 36 fayalite (21 non-abraded+15 a...
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Scottish Vision Group Meeting, Isle of Arran, Scotland, 10–12 March 2017 Keynote 1: fMRI Recording From the Human LGN – Four Unexpected Findings Kathy T. Mullen, Dorita F. Chang and Robert F. Hess McGill University, Montreal, Canada Functional magnetic resonance imaging allows direct recording from the functioning human LGN, whereas previously our understanding of this primary thalamic nucleus ...
متن کاملPaleoarchean trace fossils in altered volcanic glass.
Microbial corrosion textures in volcanic glass from Cenozoic seafloor basalts and the corresponding titanite replacement microtextures in metamorphosed Paleoarchean pillow lavas have been interpreted as evidence for a deep biosphere dating back in time through the earliest periods of preserved life on earth. This interpretation has been recently challenged for Paleoarchean titanite replacement ...
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ژورنال
عنوان ژورنال: Journal of Lithic Studies
سال: 2015
ISSN: 2055-0472
DOI: 10.2218/jls.v2i1.1166