The later history of expanded spherulites

Bryan W.H. (1963) The later history of expanded spherulites. Journal of the Geological Society of Australia, 10 1: 141-149. doi:10.1080/00167616308728536

Author Bryan W.H.
Title The later history of expanded spherulites
Journal name Journal of the Geological Society of Australia
ISSN 0016-7614
Publication date 1963-01-01
Sub-type Article (original research)
DOI 10.1080/00167616308728536
Volume 10
Issue 1
Start page 141
End page 149
Total pages 9
Subject 1900 Earth and Planetary Sciences
1901 Art Theory and Criticism
Abstract The later history of expanded spherulites (thunder eggs), as disclosed by the minerals found within their central cavities, is interpreted as due to three distinct generations of crystallization. The first, consisting of a lining of chalcedony, was based on residual silica within the cavity after the crystallization of the feldspar‐cristobalite cover. The second, in the shape of chalcedonic plates and associated drusy quartz, was due to the migration of silica from the immediately adjacent lava, aided by the diminution of the internal pressure which had given rise to the expansion of the spherulite. The third followed the introduction from purely external and, possibly distant sources, of solutions bearing quartz (in large quantities), calcite, haematite and (rarely) laumontite.
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Unknown

Document type: Journal Article
Sub-type: Article (original research)
Collection: Scopus Import
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Citation counts: Scopus Citation Count Cited 2 times in Scopus Article | Citations
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Created: Tue, 14 Jun 2016, 07:08:06 EST by System User