scholarly journals The effects of deep water cycling on planetary thermal evolution

2011 ◽  
Vol 116 (B12) ◽  
Author(s):  
Constantin Sandu ◽  
Adrian Lenardic ◽  
Patrick McGovern
Keyword(s):  
Deep Water ◽  
Thermal Evolution ◽  
Water Cycling

Understanding the thermal evolution of deep-water continental margins

Nature ◽  
2003 ◽  
Vol 426 (6964) ◽  
pp. 334-343 ◽  
Author(s):  
Nicky White ◽  
Mark Thompson ◽  
Tony Barwise
Keyword(s):  
Deep Water ◽  
Thermal Evolution ◽  
Continental Margins

Thermal evolution of the lithosphere of buried structures of the deep-water basin of the Black Sea

Oceanology ◽  
2007 ◽  
Vol 47 (5) ◽  
pp. 718-729 ◽  
Author(s):  
Yu. I. Galushkin ◽  
A. A. Schreider ◽  
A. A. Bulychev ◽  
Al. A. Schreider
Keyword(s):  
Black Sea ◽  
Deep Water ◽  
Thermal Evolution ◽  
The Black Sea ◽  
Buried Structures ◽  
Water Basin ◽  
Deep Water Basin

scholarly journals Keeping M-Earths habitable in the face of atmospheric loss by sequestering water in the mantle

2020 ◽  
Vol 496 (3) ◽  
pp. 3786-3795 ◽  
Author(s):  
Keavin Moore ◽  
Nicolas B Cowan
Keyword(s):  
Water Loss ◽  
Time Scale ◽  
Extreme Ultraviolet ◽  
Thermal Evolution ◽  
Coupled Model ◽  
Dwarf Stars ◽  
Water Cycling ◽  
Seafloor Pressure ◽  
M Dwarf Stars ◽  
Atmospheric Loss

ABSTRACT Water cycling between Earth’s mantle and surface has previously been modelled and extrapolated to rocky exoplanets, but these studies neglected the host star. M-dwarf stars are more common than Sun-like stars and at least as likely to host temperate rocky planets (M-Earths). However, M dwarfs are active throughout their lifetimes; specifically, X-ray and extreme ultraviolet (XUV) radiation during their early evolution can cause rapid atmospheric loss on orbiting planets. The increased bolometric flux reaching M-Earths leads to warmer, moister upper atmospheres, while XUV radiation can photodissociate water molecules and drive hydrogen and oxygen escape to space. Here, we present a coupled model of deep-water cycling and water loss to space on M-Earths to explore whether these planets can remain habitable despite their volatile evolution. We use a cycling parametrization accounting for the dependence of mantle degassing on seafloor pressure, the dependence of regassing on mantle temperature, and the effect of water on mantle viscosity and thermal evolution. We assume the M dwarf’s XUV radiation decreases exponentially with time, and energy-limited water loss with 30 per cent efficiency. We explore the effects of cycling and loss to space on planetary water inventories and water partitioning. Planet surfaces desiccated by loss can be rehydrated, provided there is sufficient water sequestered in the mantle to degas once loss rates diminish at later times. For a given water loss rate, the key parameter is the mantle overturn time-scale at early times: if the mantle overturn time-scale is longer than the loss time-scale, then the planet is likely to keep some of its water.

Analyses on the tectonic thermal evolution and influence factors in the deep-water Qiongdongnan Basin

2014 ◽  
Vol 33 (12) ◽  
pp. 107-117 ◽  
Author(s):  
Zhenfeng Wang ◽  
Xiaobin Shi ◽  
Jun Yang ◽  
Baojia Huang ◽  
Zhen Sun ◽  
...  
Keyword(s):  
Deep Water ◽  
Thermal Evolution ◽  
Influence Factors ◽  
Qiongdongnan Basin

scholarly journals Deep Water Cycling and Sea Level Change Since the Breakup of Pangea

2019 ◽  
Vol 20 (6) ◽  
pp. 2919-2935 ◽  
Author(s):  
Krister S. Karlsen ◽  
Clinton P. Conrad ◽  
Valentina Magni
Keyword(s):  
Sea Level ◽  
Deep Water ◽  
Sea Level Change ◽  
Level Change ◽  
Water Cycling ◽  
And Sea Level

Benthic foraminiferal zonation in deep-water carbonate platform margin environments, northern Little Bahama Bank

1988 ◽  
Vol 62 (01) ◽  
pp. 1-8 ◽  
Author(s):  
Ronald E. Martin
Keyword(s):  
Deep Water ◽  
Benthic Foraminifera ◽  
Carbonate Platform ◽  
Sedimentary Facies ◽  
Depositional Environments ◽  
Near Surface ◽  
Sediment Gravity Flows ◽  
Gravity Flows ◽  
Platform Margin ◽  
Water Carbonate

The utility of benthic foraminifera in bathymetric interpretation of clastic depositional environments is well established. In contrast, bathymetric distribution of benthic foraminifera in deep-water carbonate environments has been largely neglected. Approximately 260 species and morphotypes of benthic foraminifera were identified from 12 piston core tops and grab samples collected along two traverses 25 km apart across the northern windward margin of Little Bahama Bank at depths of 275-1,135 m. Certain species and operational taxonomic groups of benthic foraminifera correspond to major near-surface sedimentary facies of the windward margin of Little Bahama Bank and serve as reliable depth indicators. Globocassidulina subglobosa, Cibicides rugosus, and Cibicides wuellerstorfi are all reliable depth indicators, being most abundant at depths >1,000 m, and are found in lower slope periplatform aprons, which are primarily comprised of sediment gravity flows. Reef-dwelling peneroplids and soritids (suborder Miliolina) and rotaliines (suborder Rotaliina) are most abundant at depths <300 m, reflecting downslope bottom transport in proximity to bank-margin reefs. Small miliolines, rosalinids, and discorbids are abundant in periplatform ooze at depths <300 m and are winnowed from the carbonate platform. Increased variation in assemblage diversity below 900 m reflects mixing of shallow- and deep-water species by sediment gravity flows.

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