A Change in the Geodynamics of Continental Growth 3 Billion Years Ago

被引：725

作者：

Dhuime, Bruno ^{[1
,2
]}

Hawkesworth, Chris J. ^{[1
]}

Cawood, Peter A. ^{[1
]}

Storey, Craig D. ^{[3
]}

机构：

[1] Univ St Andrews, Dept Earth Sci, St Andrews KY16 9AL, Fife, Scotland

[2] Univ Bristol, Dept Earth Sci, Bristol BS8 1RJ, Avon, England

[3] Univ Portsmouth, Sch Earth & Environm Sci, Portsmouth PO1 3QL, Hants, England

来源：

SCIENCE | 2012年 / 335卷 / 6074期

基金：

英国自然环境研究理事会;

关键词：

CRUSTAL EVOLUTION; SUBDUCTION ZONES; OXYGEN ISOTOPES; PLATE-TECTONICS; ZIRCON; MANTLE; PRESERVATION; HF; SUPERCONTINENTS; GEOCHEMISTRY;

D O I：

10.1126/science.1216066

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

Models for the growth of continental crust rely on knowing the balance between the generation of new crust and the reworking of old crust throughout Earth's history. The oxygen isotopic composition of zircons, for which uranium-lead and hafnium isotopic data provide age constraints, is a key archive of crustal reworking. We identified systematic variations in hafnium and oxygen isotopes in zircons of different ages that reveal the relative proportions of reworked crust and of new crust through time. Growth of continental crust appears to have been a continuous process, albeit at variable rates. A marked decrease in the rate of crustal growth at similar to 3 billion years ago may be linked to the onset of subduction-driven plate tectonics.

引用

页码：1334 / 1336

页数：3

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