Sensitivity of seafloor bathymetry to climate-driven fluctuations in mid-ocean ridge magma supply

被引：72

作者：

Olive, J. -A. ^{[1
]}

Behn, M. D. ^{[2
]}

Ito, G. ^{[3
]}

Buck, W. R. ^{[1
]}

Escartin, J. ^{[4
]}

Howell, S. ^{[3
]}

机构：

[1] Columbia Univ, Lamont Doherty Earth Observ, Palisades, NY 10964 USA

[2] Woods Hole Oceanog Inst, Woods Hole, MA 02543 USA

[3] Univ Hawaii, Honolulu, HI 96822 USA

[4] Univ Paris Diderot, Inst Phys Globe Paris, CNRS, Paris, France

来源：

SCIENCE | 2015年 / 350卷 / 6258期

基金：

美国国家科学基金会;

关键词：

MID-ATLANTIC RIDGE; EAST PACIFIC RISE; CRUSTAL ACCRETION; RIFT-VALLEY; MORPHOLOGY; EPISODICITY; BENEATH; FAULT;

D O I：

10.1126/science.aad0715

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：

Recent studies have proposed that the bathymetric fabric of the seafloor formed at mid-ocean ridges records rapid (23,000 to 100,000 years) fluctuations in ridge magma supply caused by sealevel changes that modulate melt production in the underlying mantle. Using quantitative models of faulting and magma emplacement, we demonstrate that, in fact, seafloor-shaping processes act as a low-pass filter on variations in magma supply, strongly damping fluctuations shorter than about 100,000 years. We show that the systematic decrease in dominant seafloor wavelengths with increasing spreading rate is best explained by a model of fault growth and abandonment under a steady magma input. This provides a robust framework for deciphering the footprint of mantle melting in the fabric of abyssal hills, the most common topographic feature on Earth.

引用

页码：310 / 313

页数：5

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