The oldest abundant volcanic glass on Earth

Autor:	L. H. Hamilton
Rok vydání:	1992
Předmět:	geography geography.geographical_feature_category Felsic Paleozoic Permian engineering.material Volcanic glass Paleontology Precambrian Volcano Carboniferous Earth and Planetary Sciences (miscellaneous) engineering General Earth and Planetary Sciences Biotite Geology
Zdroj:	Australian Journal of Earth Sciences. 39:55-59
ISSN:	1440-0952 0812-0099
DOI:	10.1080/08120099208728000
Popis:	The oldest abundant volcanic glass on Earth occurs in a Carboniferous ignimbrite in the region of Port Stephens, NSW. The K‐Ar age of 332 ± 4 Ma on biotite is consistent with the geological relations and establishes a Carboniferous age for the glass. The glassy nature has been established by X‐ray diffraction and electron diffraction. Although Palaeozoic glass is relatively rare it appears that locally abundant glass occurs in felsic ignimbrite of Permian and Carboniferous age at several places in Australia and Europe. Apart from a minor occurrence of Precambrian glass in a dyke apophysis there appears to be no well established occurrence of pre‐Carboniferous volcanic glass on Earth.
Databáze:	OpenAIRE
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