The petrology of the Mt Manypeaks Adamellite and associated high‐grade metamorphic rocks near Albany, Western Australia
作者:
N. C. N. Stephenson,
期刊:
Journal of the Geological Society of Australia
(Taylor Available online 1973)
卷期:
Volume 19,
issue 4
页码: 413-439
ISSN:0016-7614
年代: 1973
DOI:10.1080/00167617308728811
出版商: Taylor & Francis Group
数据来源: Taylor
摘要:
The Mt Manypeaks Adamellite is a composite, regionally concordant pluton at least 22 km long and 3 km wide, associated with Precambrian amphibolite facies gneisses of the Albany‐Esperance Block, and situated about 35 km east of Albany, Western Australia. The pluton is surrounded by a granitised aureole, and shows structural and mineralogical harmony with the country rocks. Contacts vary from grada‐tional to sharp. Hence field relations are consistent with syn‐ or late‐kinematic emplacement in the catazone. The normative composition of the pluton corresponds with the thermal trough in the system An‐Ab‐Or‐Q‐H2O at 7 kb PH2O, suggesting an origin involving crystal‐melt equilibria. The pluton is believed to have formed almostin situby partial anatexis of the country rocks at 700–750°C and a depth of about 25 km during the orogenic episode responsible for regional metamorphism and deformation.
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