Ultramafic and associated rocks from southern New Caledonia

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dc.contributor.author Rodgers, K. A.(Kerry Anthony), 1942- en
dc.date.accessioned 2007-08-28T06:09:06Z en
dc.date.available 2007-08-28T06:09:06Z en
dc.date.issued 1972 en
dc.identifier THESIS 72-131 en
dc.identifier.citation Thesis (PhD--Geology)--University of Auckland, 1972 en
dc.identifier.uri http://hdl.handle.net/2292/1529 en
dc.description Full text is available to authenticated members of The University of Auckland only. en
dc.description.abstract The New Caledonian ultramafic belt is a peridotite-gabbro-granodiorite, alpine-type complex which crops out over the length of the archipelago (some 500 km) as a series of upstanding, perched massifs. The southern portion of the largest of these massifs consists predominantly of partially serpentinised harzburgite containing a dunite-chromitite-eucrite core. Relict cumulus textures, gradational contacts between major lithologic units, and mineral compositions indicate that this core is a gravity differentiate formed at ~1GNm-2, 1200-1400C and constant oxygen fugacity from a mafic magma derived by partial melting of primitive pyrolite, the refractory residue of which constitutes the marzburgites. Upwelling within the lithosphere of the combined harzburgite residue and cumulate mush, resulted in partial obliteration of igneous textures by recrystallisation and the development of tectonite fabrics and foliation. Emplacement onto the New Caledonian sialic segment was probably by overthrusting from the northeast as suggested by Avias (1967) and Coleman (1971) resulting in cataclasis, mylonitisation and metamorphic differentiation of the basal rock of the complex. This Qverthrust followed eruption of subalkaline, quartz bearing basalts derived from the original magmatic episode. Granodiorite/diorite stocks,. representing the final alkali­rich fractionate, intruded the peridotite cover along faults within the basement. en
dc.language.iso en en
dc.publisher ResearchSpace@Auckland en
dc.relation.ispartof PhD Thesis - University of Auckland en
dc.relation.isreferencedby UoA9921699414002091 en
dc.rights Restricted Item. Available to authenticated members of The University of Auckland. en
dc.rights Items in ResearchSpace are protected by copyright, with all rights reserved, unless otherwise indicated. en
dc.rights.uri https://researchspace.auckland.ac.nz/docs/uoa-docs/rights.htm en
dc.title Ultramafic and associated rocks from southern New Caledonia en
dc.type Thesis en
thesis.degree.discipline Geology en
thesis.degree.grantor The University of Auckland en
thesis.degree.level Doctoral en
thesis.degree.name PhD en
dc.rights.holder Copyright: The author en

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