Magmatic and Crustal Differentiation History of Granitic Rocks from Hf-O Isotopes in Zircon

AIS Kemp; Christopher John Hawkesworth; GL Foster; BA Paterson; JD Woodhead; JM Hergt; CM Gray; MJ Whitehouse

doi:10.1126/science.1136154

Magmatic and Crustal Differentiation History of Granitic Rocks from Hf-O Isotopes in Zircon

AIS Kemp, Christopher John Hawkesworth, GL Foster, BA Paterson, JD Woodhead, JM Hergt, CM Gray, MJ Whitehouse

Research output: Contribution to journal › Article › peer-review

Abstract

Granitic plutonism is the principal agent of crustal differentiation, but linking granite emplacement to crust formation requires knowledge of the magmatic evolution, which is notoriously difficult to reconstruct from bulk rock compositions. We unlocked the plutonic archive through hafnium (Hf) and oxygen (O) isotope analysis of zoned zircon crystals from the classic hornblende-bearing (I-type) granites of eastern Australia. This granite type forms by the reworking of sedimentary materials by mantle-like magmas instead of by remelting ancient metamorphosed igneous rocks as widely believed. I-type magmatism thus drives the coupled growth and differentiation of continental crust.

Original language	English
Pages (from-to)	980-983
Number of pages	4
Journal	Science
Volume	315
Issue number	5814
DOIs	https://doi.org/10.1126/science.1136154
Publication status	Published - 16 Feb 2007

Keywords

LACHLAN FOLD BELT
I-TYPE GRANITES
SOUTHEASTERN AUSTRALIA
CONTINENTAL-CRUST
SIERRA-NEVADA
MIXING MODEL
S-TYPE
CRYSTALLIZATION
ASSIMILATION
PHENOCRYSTS

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title = "Magmatic and Crustal Differentiation History of Granitic Rocks from Hf-O Isotopes in Zircon",

abstract = "Granitic plutonism is the principal agent of crustal differentiation, but linking granite emplacement to crust formation requires knowledge of the magmatic evolution, which is notoriously difficult to reconstruct from bulk rock compositions. We unlocked the plutonic archive through hafnium (Hf) and oxygen (O) isotope analysis of zoned zircon crystals from the classic hornblende-bearing (I-type) granites of eastern Australia. This granite type forms by the reworking of sedimentary materials by mantle-like magmas instead of by remelting ancient metamorphosed igneous rocks as widely believed. I-type magmatism thus drives the coupled growth and differentiation of continental crust.",

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AU - Kemp, AIS

AU - Hawkesworth, Christopher John

AU - Foster, GL

AU - Paterson, BA

AU - Woodhead, JD

AU - Hergt, JM

AU - Gray, CM

AU - Whitehouse, MJ

N1 - Report

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N2 - Granitic plutonism is the principal agent of crustal differentiation, but linking granite emplacement to crust formation requires knowledge of the magmatic evolution, which is notoriously difficult to reconstruct from bulk rock compositions. We unlocked the plutonic archive through hafnium (Hf) and oxygen (O) isotope analysis of zoned zircon crystals from the classic hornblende-bearing (I-type) granites of eastern Australia. This granite type forms by the reworking of sedimentary materials by mantle-like magmas instead of by remelting ancient metamorphosed igneous rocks as widely believed. I-type magmatism thus drives the coupled growth and differentiation of continental crust.

AB - Granitic plutonism is the principal agent of crustal differentiation, but linking granite emplacement to crust formation requires knowledge of the magmatic evolution, which is notoriously difficult to reconstruct from bulk rock compositions. We unlocked the plutonic archive through hafnium (Hf) and oxygen (O) isotope analysis of zoned zircon crystals from the classic hornblende-bearing (I-type) granites of eastern Australia. This granite type forms by the reworking of sedimentary materials by mantle-like magmas instead of by remelting ancient metamorphosed igneous rocks as widely believed. I-type magmatism thus drives the coupled growth and differentiation of continental crust.

KW - LACHLAN FOLD BELT

KW - I-TYPE GRANITES

KW - SOUTHEASTERN AUSTRALIA

KW - CONTINENTAL-CRUST

KW - SIERRA-NEVADA

KW - MIXING MODEL

KW - S-TYPE

KW - CRYSTALLIZATION

KW - ASSIMILATION

KW - PHENOCRYSTS

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U2 - 10.1126/science.1136154

DO - 10.1126/science.1136154

M3 - Article

SN - 0036-8075

VL - 315

SP - 980

EP - 983

JO - Science

JF - Science

IS - 5814

ER -

Magmatic and Crustal Differentiation History of Granitic Rocks from Hf-O Isotopes in Zircon

Abstract

Keywords

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