ORCID Profile
0000-0001-6528-9739
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Publisher: Springer Science and Business Media LLC
Date: 05-1996
DOI: 10.1038/381285A0
Publisher: Informa UK Limited
Date: 08-2012
Publisher: Springer Science and Business Media LLC
Date: 12-2013
DOI: 10.1038/NATURE12778
Abstract: Three-quarters of the oceanic crust formed at fast-spreading ridges is composed of plutonic rocks whose mineral assemblages, textures and compositions record the history of melt transport and crystallization between the mantle and the sea floor. Despite the importance of these rocks, s ling them in situ is extremely challenging owing to the overlying dykes and lavas. This means that models for understanding the formation of the lower crust are based largely on geophysical studies and ancient analogues (ophiolites) that did not form at typical mid-ocean ridges. Here we describe cored intervals of primitive, modally layered gabbroic rocks from the lower plutonic crust formed at a fast-spreading ridge, s led by the Integrated Ocean Drilling Program at the Hess Deep rift. Centimetre-scale, modally layered rocks, some of which have a strong layering-parallel foliation, confirm a long-held belief that such rocks are a key constituent of the lower oceanic crust formed at fast-spreading ridges. Geochemical analysis of these primitive lower plutonic rocks--in combination with previous geochemical data for shallow-level plutonic rocks, sheeted dykes and lavas--provides the most completely constrained estimate of the bulk composition of fast-spreading oceanic crust so far. Simple crystallization models using this bulk crustal composition as the parental melt accurately predict the bulk composition of both the lavas and the plutonic rocks. However, the recovered plutonic rocks show early crystallization of orthopyroxene, which is not predicted by current models of melt extraction from the mantle and mid-ocean-ridge basalt differentiation. The simplest explanation of this observation is that compositionally erse melts are extracted from the mantle and partly crystallize before mixing to produce the more homogeneous magmas that erupt.
Publisher: Oxford University Press (OUP)
Date: 24-09-2014
Publisher: Elsevier BV
Date: 09-2014
Publisher: American Geophysical Union (AGU)
Date: 05-04-2011
DOI: 10.1029/2010GC003405
Publisher: MDPI AG
Date: 03-03-2022
DOI: 10.3390/GEOSCIENCES12030118
Abstract: Lava s les from the Christmas Island Seamount Province (CHRISP) record an extreme range in enriched mantle (EM) type Sr-Nd-Pb-Hf isotope signatures. Here we report osmium isotope data obtained on four s les from the youngest, Pliocene petit-spot phase (Upper Volcanic Series, UVS ~4.4 Ma), and four s les from the earlier, Eocene (Lower Volcanic Series, LVS ~40 Ma) shield building phase of Christmas Island. Osmium concentrations are low (5–82 ppt) with initial Os isotopic values (187Os/188Osi) ranging from (0.1230–0.1679). Along with additional new geochemical data (major and trace elements, Sr-Nd-Pb isotopes, olivine δ18O values), we demonstrate the following: (1) The UVS is consistent with melting of shallow Indian mid-ocean ridge basalt (MORB) mantle enriched with both lower continental crust (LCC) and subcontinental lithospheric mantle (SCLM) components and (2) The LVS is consistent with recycling of SCLM components related to Gondwana break-up. The SCLM component has FOZO or HIMU like characteristics. One of the LVS s les has less radiogenic Os (γOs –3.4) and provides evidence for the presence of ancient SCLM in the source. The geochemistry of the Christmas Island lava series supports the idea that continental breakup causes shallow recycling of lithospheric and lower crustal components into the ambient MORB mantle.
Publisher: Springer Science and Business Media LLC
Date: 08-01-2008
Publisher: Informa UK Limited
Date: 08-2006
Publisher: American Geophysical Union (AGU)
Date: 09-2015
DOI: 10.1002/2015GC005717
Publisher: Informa UK Limited
Date: 03-2007
Publisher: American Geophysical Union (AGU)
Date: 12-2012
DOI: 10.1029/2012GC004335
Publisher: Elsevier BV
Date: 12-1993
Publisher: Oxford University Press (OUP)
Date: 08-2000
Publisher: American Geophysical Union (AGU)
Date: 09-2007
DOI: 10.1029/2007GC001619
Publisher: Oxford University Press (OUP)
Date: 11-10-2007
Publisher: Informa UK Limited
Date: 18-05-2016
Publisher: Springer Science and Business Media LLC
Date: 11-1987
DOI: 10.1007/BF00372004
No related organisations have been discovered for Trevor Falloon.
Start Date: 2009
End Date: 2009
Funder: Australian Research Council
View Funded ActivityStart Date: 2005
End Date: 2013
Funder: Teck Cominco Limited
View Funded ActivityStart Date: 2005
End Date: 2013
Funder: Newmont Australia Ltd
View Funded ActivityStart Date: 2005
End Date: 2013
Funder: Australian National University
View Funded ActivityStart Date: 2005
End Date: 2013
Funder: BHP Billiton Ltd
View Funded ActivityStart Date: 2005
End Date: 2013
Funder: AMIRA International Ltd
View Funded ActivityStart Date: 2005
End Date: 2013
Funder: Newcrest Mining Limited
View Funded ActivityStart Date: 2005
End Date: 2013
Funder: University of Queensland
View Funded ActivityStart Date: 2010
End Date: 2013
Funder: Oz Minerals Australia Limited
View Funded ActivityStart Date: 2008
End Date: 2010
Funder: ARC C of E Industry Partner $ to be allocated
View Funded ActivityStart Date: 2005
End Date: 2009
Funder: Minerals Council of Australia
View Funded ActivityStart Date: 2005
End Date: 2013
Funder: AngloGold Ashanti Australia Limited
View Funded ActivityStart Date: 2005
End Date: 2013
Funder: CSIRO Earth Science & Resource Engineering
View Funded ActivityStart Date: 2005
End Date: 2013
Funder: University of Melbourne
View Funded ActivityStart Date: 2005
End Date: 2008
Funder: Zinifex Australia Ltd
View Funded ActivityStart Date: 2008
End Date: 2013
Funder: St Barbara Limited
View Funded ActivityStart Date: 2005
End Date: 2013
Funder: Anglo American Exploration Philippines Inc
View Funded ActivityStart Date: 2005
End Date: 2009
Funder: Mineral Resources Tasmania
View Funded ActivityStart Date: 2005
End Date: 2013
Funder: Barrick (Australia Pacific) PTY Limited
View Funded ActivityStart Date: 2005
End Date: 2013
Funder: Rio Tinto Exploration
View Funded ActivityStart Date: 2008
End Date: 2012
Funder: Australian Research Council
View Funded ActivityStart Date: 2005
End Date: 2013
Funder: Australian Research Council
View Funded Activity