A vestige of Earth's oldest ophiolite

被引：240

作者：

Furnes, Harald ^{[1
]}

de Wit, Maarten

Staudigel, Hubert

Rosing, Minik

Muehlenbachs, Karlis

机构：

[1] Univ Bergen, Ctr Geobiol, Bergen, Norway

[2] Univ Bergen, Dept Earth Sci, Bergen, Norway

[3] Univ Cape Town, Africa Earth Observ Network, ZA-7700 Rondebosch, South Africa

[4] Univ Cape Town, Dept Geol Sci, ZA-7700 Rondebosch, South Africa

[5] Geoforsch Zentrum, Potsdam, Germany

[6] Univ Calif San Diego, Scripps Inst Oceanog, La Jolla, CA 92093 USA

[7] Univ Copenhagen, Nord Ctr Earth Evolut, DK-1350 Copenhagen K, Denmark

[8] Univ Copenhagen, Geol Museum, DK-1350 Copenhagen K, Denmark

[9] Univ Alberta, Dept Earth & Atmospher Sci, Edmonton, AB T6G 2E3, Canada

来源：

SCIENCE | 2007年 / 315卷 / 5819期

关键词：

D O I：

10.1126/science.1139170

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：

A sheeted-dike complex within the similar to 3.8-billion-year-old Isua supracrustal belt (ISB) in southwest Greenland provides the oldest evidence of oceanic crustal accretion by spreading. The geochemistry of the dikes and associated pillow lavas demonstrates an intraoceanic island arc and mid-ocean ridge-like setting, and their oxygen isotopes suggest a hydrothermal ocean-floor-type metamorphism. The pillows and dikes are associated with gabbroic and ultramafic rocks that together make up an ophiolitic association: the Paleoarchean Isua ophiolite complex. These sheeted dikes offer evidence for remnants of oceanic crust formed by sea-floor spreading of the earliest intact rocks on Earth.

引用

页码：1704 / 1707

页数：4

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