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The Central Chain ophiolites in New Caledonia are fragments of a supra-subduction zone (SSZ) ophiolite, now preserved from the upper layered gabbros through to volcanics and overlain by pelagic cherts and a thick Middle Triassic to Upper... more
The Central Chain ophiolites in New Caledonia are fragments of a supra-subduction zone (SSZ) ophiolite, now preserved from the upper layered gabbros through to volcanics and overlain by pelagic cherts and a thick Middle Triassic to Upper Jurassic volcaniclastic sequence. Most of the fragments were formed by a single tholeiitic magmatic episode, but one of these, the Koh ophiolite, was
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The Heathcote Greenstone Belt is composed mainly of Lower Cambrian metavolcanic rocks and is one of three outcropping belts of the apparent basement to the Lachlan Fold Belt in SE Australia. The greenstones may be assigned to two broad... more
The Heathcote Greenstone Belt is composed mainly of Lower Cambrian metavolcanic rocks and is one of three outcropping belts of the apparent basement to the Lachlan Fold Belt in SE Australia. The greenstones may be assigned to two broad magma series. A younger tholeiitic series with mid‐ocean ridge basalt (MORB) affinities has intruded through, and been erupted upon low‐Ti, intermediate
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The oldest rocks in the mainland southeastern Australian segment of the (Palaeozoic) Lachlan Fold Belt are Cambrian greenstones which outcrop in three narrow linear belts separated by Lower Palaeozoic marine troughs in which many... more
The oldest rocks in the mainland southeastern Australian segment of the (Palaeozoic) Lachlan Fold Belt are Cambrian greenstones which outcrop in three narrow linear belts separated by Lower Palaeozoic marine troughs in which many thousands of meters of predominantly greywacke-shale sediments accumulated. The greenstone belt nearest the Australian craton, the Mt. Stavely Greenstone Belt, is composed of calc-alkalic meta-andesites, metadacites
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The Australian-Antarctic Discordance (AAD) is an anomalously deep region centered on the Southeast Indian Ridge (SEIR) between Australia and Antarctica. Among its unique features is an unusually sharp boundary between the ocean-basin... more
The Australian-Antarctic Discordance (AAD) is an anomalously deep region centered on the Southeast Indian Ridge (SEIR) between Australia and Antarctica. Among its unique features is an unusually sharp boundary between the ocean-basin scale, upper mantle isotopic domains of the Pacific and Indian Oceans. This boundary has migrated westward into and across the easternmost segment of the AAD at a rate
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... Geochemistry and tectonic significance of basalts in the Poya Terrane, New Caledonia a* JeanPhilippe Elssen ' , Anthony J. Crawford b ... Poya Terrane sequences are dominated by lowgrade metamorphosed, often tectonized, pil lowed... more
... Geochemistry and tectonic significance of basalts in the Poya Terrane, New Caledonia a* JeanPhilippe Elssen ' , Anthony J. Crawford b ... Poya Terrane sequences are dominated by lowgrade metamorphosed, often tectonized, pil lowed hasalts, with associated hyaloclastites, fine ...
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Research Interests: Geology and Island Arc
... MK7 6AA, UK David W. Peate Danish Lithosphere Centre, Øster Voldgade 10, DK-1350 Copenhagen K, Denmark Chris J. Hawkesworth ... to this study are that the Vanuatu lavas show evidence for contributions from three components; the mantle... more
... MK7 6AA, UK David W. Peate Danish Lithosphere Centre, Øster Voldgade 10, DK-1350 Copenhagen K, Denmark Chris J. Hawkesworth ... to this study are that the Vanuatu lavas show evidence for contributions from three components; the mantle wedge, subducted sediments ...
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A seamount chain extending from the Balleny Islands to the East Tasman Plateau records the passage of the Australian and Antarctic plates over the Balleny plume. A poorly known seamount chain trending northeast from the East Tasman... more
A seamount chain extending from the Balleny Islands to the East Tasman Plateau records the passage of the Australian and Antarctic plates over the Balleny plume. A poorly known seamount chain trending northeast from the East Tasman Plateau across the Tasman Sea to the western edge off the Lord Howe Rise represents a possible older trace of the plume. Late
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Early Ordovician (Phase 1) magmatism in the Macquarie Arc was followed by a magmatic hiatus of ∼9 million years, between late Bendigonian and early Darriwilian (i.e. between ca 475 and ca 466 Ma). Resumption of magmatism in the Middle... more
Early Ordovician (Phase 1) magmatism in the Macquarie Arc was followed by a magmatic hiatus of ∼9 million years, between late Bendigonian and early Darriwilian (i.e. between ca 475 and ca 466 Ma). Resumption of magmatism in the Middle Ordovician produced Phase 2 rocks, recorded by three major rock suites: (i) medium-K calc-alkaline lavas in the Cargo block (Molong Volcanic Belt)