Display Settings:

Format

Send to:

Choose Destination
See comment in PubMed Commons below
Science. 2007 Feb 16;315(5814):980-3.

Magmatic and crustal differentiation history of granitic rocks from Hf-O isotopes in zircon.

Author information

  • 1Bristol Isotope Group, Earth Sciences Department, University of Bristol, Bristol BS8 1RJ, UK. tony.kemp@jcu.edu.au

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.

Comment in

PMID:
17303751
[PubMed]
Free full text
PubMed Commons home

PubMed Commons

0 comments
How to join PubMed Commons

    Supplemental Content

    Icon for HighWire
    Loading ...
    Write to the Help Desk