Skip navigation
Skip navigation
The system will be down for maintenance between 8:00 and 8:15am on Thursday 13, December 2018

Thermal history of UHT metamorphism in the Napier Complex, East Antarctica: insights from zircon, monazite and garnet ages

Suzuki, Satoko; Arima, Makato; Williams, Ian; Shiraishi, Kazuyuki; Kagami, Hiroo

Description

High-grade gneisses from Mt. Riiser-Larsen, East Antarctica, have been dated by whole-rock-mineral Sm-Nd and SHRIMP zircon and monazite U-Pb to help define the thermal history of ultrahigh temperature (UHT) metamorphism in the Napier Complex. Both the monazite and youngest zircon yield a range of apparent ages (∼2.51-2.47 Ga), consistent with crystallization during an extended period of metamorphism. Some zircon also preserves an isotopic record of earlier events, placing an upper limit of a...[Show more]

dc.contributor.authorSuzuki, Satoko
dc.contributor.authorArima, Makato
dc.contributor.authorWilliams, Ian
dc.contributor.authorShiraishi, Kazuyuki
dc.contributor.authorKagami, Hiroo
dc.date.accessioned2015-12-07T22:46:42Z
dc.identifier.issn0022-1376
dc.identifier.urihttp://hdl.handle.net/1885/25884
dc.description.abstractHigh-grade gneisses from Mt. Riiser-Larsen, East Antarctica, have been dated by whole-rock-mineral Sm-Nd and SHRIMP zircon and monazite U-Pb to help define the thermal history of ultrahigh temperature (UHT) metamorphism in the Napier Complex. Both the monazite and youngest zircon yield a range of apparent ages (∼2.51-2.47 Ga), consistent with crystallization during an extended period of metamorphism. Some zircon also preserves an isotopic record of earlier events, placing an upper limit of a few million years on the duration of peak metamorphic conditions. The similarity of the monazite and zircon U-Pb ages implies rapid initial postpeak, cooling to below the blocking temperature of these minerals (∼900°C). Consistently lower Sm-Nd whole-rock-mineral isochron ages (∼2.38 Ga) indicate that cooling slowed before the temperature reached ∼650°C. The history of the UHT metamorphism is interpreted to be (1) protracted high-temperature (≥800°C) conditions ∼2.51-2.47 Ga, (2) peak conditions (up to 1100°C) for at most a few million years, (3) rapid cooling (10°-60°C/m.yr.) immediately after peak metamorphism, and (4) very slow cooling (≤4°C/m.yr.) at midcrustal levels (∼30-km depth) to a steady state geotherm by 2.38 Ga.
dc.publisherUniversity of Chicago Press
dc.sourceJournal of Geology
dc.subjectKeywords: gneiss; ultrahigh temperature metamorphism; Antarctica; East Antarctica
dc.titleThermal history of UHT metamorphism in the Napier Complex, East Antarctica: insights from zircon, monazite and garnet ages
dc.typeJournal article
local.description.notesImported from ARIES
local.identifier.citationvolume114
dc.date.issued2006
local.identifier.absfor040304 - Igneous and Metamorphic Petrology
local.identifier.absfor040303 - Geochronology
local.identifier.absfor040306 - Mineralogy and Crystallography
local.identifier.ariespublicationu4047674xPUB41
local.type.statusPublished Version
local.contributor.affiliationSuzuki, Satoko, Nagoya University
local.contributor.affiliationArima, Makato, Yokohama National University
local.contributor.affiliationWilliams, Ian, College of Physical and Mathematical Sciences, ANU
local.contributor.affiliationShiraishi, Kazuyuki, National Institute of Polar Research
local.contributor.affiliationKagami, Hiroo, Niigata University
local.description.embargo2037-12-31
local.bibliographicCitation.startpage65
local.bibliographicCitation.lastpage84
local.identifier.doi10.1086/498100
dc.date.updated2015-12-07T11:44:58Z
local.identifier.scopusID2-s2.0-30344476128
CollectionsANU Research Publications

Download

File Description SizeFormat Image
01_Suzuki_Thermal_history_of_UHT_2006.pdf2.99 MBAdobe PDF    Request a copy


Items in Open Research are protected by copyright, with all rights reserved, unless otherwise indicated.

Updated:  27 November 2018/ Responsible Officer:  University Librarian/ Page Contact:  Library Systems & Web Coordinator