Antarctic tectonics: Constraints from an ERS-1 satellite marine gravity field

被引：68

作者：

McAdoo, D ^{[1
]}

Laxon, S ^{[1
]}

机构：

[1] UCL, MULLARD SPACE SCI LAB, DEPT SPACE & CLIMATE PHYS, DORKING RH5 6NT, SURREY, ENGLAND

来源：

SCIENCE | 1997年 / 276卷 / 5312期

关键词：

D O I：

10.1126/science.276.5312.556

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 high-resolution gravity field of poorly charted and ice-covered ocean near West Antarctica, from the Ross Sea east to the Weddell Sea, has been derived with the use of satellite altimetry, including ERS-1 geodetic phase, wave-form data. This gravity field reveals regional tectonic fabric, such as gravity lineations, which are the expression of fracture zones left by early (65 to 83 million years ago) Pacific-Antarctic sea-floor spreading that separated the Campbell Plateau and New Zealand continent from West Antarctica. These lineations constrain plate motion history and confirm the hypothesis that Antarctica behaved as two distinct plates, separated from each other by an extensional Bellingshausen plate boundary active in the Amundsen Sea before about 61 million years ago.

引用

页码：556 / 560

页数：5

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