The mineralogy of the Gosse pile ultramafic intrusion, central Australia. II. Pyroxenes
作者:
A. C. Moore,
期刊:
Journal of the Geological Society of Australia
(Taylor Available online 1971)
卷期:
Volume 18,
issue 3
页码: 243-258
ISSN:0016-7614
年代: 1971
DOI:10.1080/00167617108728764
出版商: Taylor & Francis Group
数据来源: Taylor
摘要:
The orthopyroxenes of Gosse Pile, a layered ultramafic sequence within the Giles Complex of central Australia, show unusual exsolution features such as the development of ‘hour‐glass’ shapes by clinopyroxene lamellae, and also the exsolution of spinel and rutile. Both orthopyroxene and clinopyroxene have high R2O3 contents and their distribution coefficients for Mg and Fe are high (average KD = 0.88). Some, if not all, of these features are considered to indicate that the Gosse Pile rocks crystallized under high pressure. This interpretation also explains the predominance of orthopyroxene over olivine as an early cumulus phase. Estimated conditions during crystallization are 10–14 kilobars and between 1,200‐l,400°C.
点击下载:
PDF (1254KB)
返 回