Comment on "Sensitivity of seafloor bathymetry to climate-driven fluctuations in mid-ocean ridge magma supply".
نویسندگان
چکیده
Olive et al (Reports, 16 October 2015, p. 310) argue that ~10% fluctuations in melt supply do not produce appreciable changes in ocean ridge bathymetry on time scales less than 100,000 years and thus cannot reflect sea level forcing. Spectral analysis of bathymetry in a region they highlight as being fault controlled, however, shows strong evidence for a signal from sea level variation.
منابع مشابه
Global estimates of seafloor slope from single-beam ship soundings
[1] Rough topography on the ocean floor is a source of ocean mixing which is of interest to both physical oceanography and climate science. Most mixing has been attributed to high slopes of the large-scale structures of the deep ocean floor such as seamounts, continental margins, and mid-ocean ridge axes. In this paper, we show the small-scale but ubiquitous abyssal hills and fracture zones dom...
متن کاملContributions of mGal - Accuracy Gravity to Studies of Oceanic Spreading Centers and the RIDGE 2000 Program Donna
The RIDGE2000 program (R2K) is designed to further understanding of the geophysical, geochemical and geobiological causes and consequences of energy and material transfer, from the Earth’s mantle to the hydrosphere and biosphere, along the globe-encircling mid-ocean ridge system. Three sites on the ridge are the focus of detailed R2K studies that will integrate information at various scales to ...
متن کاملDoes sea level influence mid-ocean ridge magmatism on Milankovitch timescales?
[1] Magma production at mid-ocean ridges is driven by seafloor spreading and decompression melting of the upper mantle. In the special case of Iceland, mantle melting may have been amplified by ice sheet retreat during the last deglaciation, yielding anomalously high rates of subaerial volcanism. For the remainder of the global mid-ocean ridge system, the ocean may play an analogous role, with ...
متن کاملA Self-Consistent Model of Melting, Magma Migration and Buoyancy-Driven Circulation Beneath Mid-Ocean Ridges
Numerical modeling and anMysis are used to investigate the processes leading to the eruption of mantle-derived magma at mid-ocean ridges. Our model includes the following effects: melting due to decompression, magma migration by percolation, and circulation of the mantle driven by both the oceanic plates and the distribution of buoyancy beneath the ridge. The distribution of buoyancy is due to ...
متن کاملNonvolcanic seafloor spreading and corner-flow rotation
[1] Drilling during ODP Leg 209, dredging, and submersible dives have delineated an anomalous stretch of the Mid-Atlantic Ridge north and south of the 15 200N Fracture Zone. The seafloor here consists dominantly of mantle peridotite with gabbroic intrusions that in places is covered by a thin, discontinuous extrusive volcanic layer. Thick lithosphere (10–20 km) in this region inhibits magma fro...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
عنوان ژورنال:
- Science
دوره 352 6292 شماره
صفحات -
تاریخ انتشار 2015