Ben Bullen plutons, New South Wales: A Carboniferous gabbro-trondhjemite suite
作者:
Janice Knutson,
R.H. Flood,
期刊:
Australian Journal of Earth Sciences
(Taylor Available online 1988)
卷期:
Volume 35,
issue 2
页码: 245-257
ISSN:0812-0099
年代: 1988
DOI:10.1080/14400958808527944
出版商: Taylor & Francis Group
关键词: Ben Bullen;calc-alkaline;fractional crystallization;Lachlan Fold Belt;M-type
数据来源: Taylor
摘要:
The Ben Bullen plutons constitute a small medium-K gabbro-tonalite-trondhjemite suite spatially and temporally associated with extensive adamellite and granite of the Bathurst Batholith. The mafic composition of the bulk of the Ben Bullen rocks suggests a mantles source for the parent magma. Chemical and petrographic studies indicate that the rocks are closely comparable with medium-K calc-alkaline volcanic suites in island arcs. The Ben Bullen series are M-type granites in the sense of being formed by crystal fractionation of a gabbroic parental magma. Initial crystallization and separation of olivine and pyroxene followed by marked fractionation of hornblende probably drove the differentiating magma along a typical calc-alkaline trend of strong alkali-enrichment. It is possible that the rise of these mantle-derived melts into the crust initiated the crustal melting that produced the associated felsic K-rich granitoids of the Bathurst Batholith.
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