scholarly journals Multiple-scale hydrothermal circulation in 135 Ma oceanic crust of the Japan Trench outer rise: Numerical models constrained with heat flow observations

2015 ◽  
Vol 16 (8) ◽  
pp. 2711-2724 ◽  
Author(s):  
Labani Ray ◽  
Yoshifumi Kawada ◽  
Hideki Hamamoto ◽  
Makoto Yamano
Keyword(s):  
Heat Flow ◽  
Oceanic Crust ◽  
Numerical Models ◽  
Multiple Scale ◽  
Japan Trench ◽  
Hydrothermal Circulation ◽  
Outer Rise

Roles of Hydrothermal Circulations on Heat Flow in the Fore-arc, Northeast Japan Subduction Zone, A Numerical Modeling Study.

2021 ◽  
Author(s):  
Dongwoo Han ◽  
Changyeol Lee
Keyword(s):  
Heat Transfer ◽  
Heat Flow ◽  
Oceanic Crust ◽  
Numerical Models ◽  
Accretionary Prism ◽  
High Heat ◽  
Pacific Plate ◽  
Model Calculations ◽  
The Pacific ◽  
Japan Subduction Zone

<p>Heat flow in the fore-arc, Northeast Japan shows characteristic highs and lows in the seaward and landward regions of the trench axis, respectively, compared to 50 mW/m<sup>2</sup> that is constrained from the corresponding half-space cooling model (135 Ma). For example, the high average of 70 mW/m<sup>2</sup> at the 150-km seaward region from the trench was observed while the low average of 30 mW/m<sup>2</sup> at the 50-km landward region was. To explain the differences between the constraints and observations of the heat flow, previous studies suggested that the high heat flow in the seaward region results from the reactivated hydrothermal circulations in the oceanic crust of the Pacific plate along the developed fractures by the flexural bending prior to subduction. The low heat flow is thought to result from thermal blanket effect of the accretionary prism that overlies the cooled subducting slab by the hydrothermal circulations. To understand heat transfer in the landward region of the trench, a series of two-dimensional numerical models are constructed by considering hydrothermal circulations in the kinematically thickening accretionary prism that overlies the converging oceanic crust of the Pacific plate where hydrothermal circulations developed prior to subduction. The model calculations demonstrate no meaningful hydrothermal circulations when the reasonable bulk permeability of the accretionary prism(<10<sup>-14</sup>m<sup>2</sup>) is used; the thermal blanket effect significantly hinders the heat transfer, yielding only the heat flow of 10 mW/m<sup>2</sup> in the landward region, much lower than the average of 30 mW/m<sup>2</sup>. This indicates that other mechanisms such as the expelled pore fluid by compaction of the accretionary prism play important roles in the heat transfer across the accretionary prism.</p>

scholarly journals The hydrothermal power of oceanic lithosphere

Solid Earth ◽  
2015 ◽  
Vol 6 (4) ◽  
pp. 1131-1155 ◽  
Author(s):  
C. J. Grose ◽  
J. C. Afonso
Keyword(s):  
Heat Flow ◽  
Heat Transport ◽  
Oceanic Crust ◽  
Effective Properties ◽  
Oceanic Lithosphere ◽  
Hydrothermal Circulation ◽  
Heat Transport Properties ◽  
Lower Heat ◽  
The Difference ◽  
Insulating Properties

Abstract. We have estimated the power of ventilated hydrothermal heat transport, and its spatial distribution, using a set of recently developed plate models which highlight the effects of axial hydrothermal circulation and thermal insulation by oceanic crust. Testing lithospheric cooling models with these two effects, we estimate that global advective heat transport is about 6.6 TW, significantly lower than most previous estimates, and that the fraction of that extracted by vigorous circulation on the ridge axes (< 1 My old) is about 50 % of the total, significantly higher than previous estimates. These new estimates originate from the thermally insulating properties of oceanic crust in relation to the mantle. Since the crust is relatively insulating, the effective properties of the lithosphere are "crust dominated" near ridge axes (a thermal blanketing effect yielding lower heat flow) and gradually approach mantle values over time. Thus, cooling models with crustal insulation predict low heat flow over young seafloor, implying that the difference of modeled and measured heat flow is due to the heat transport properties of the lithosphere, in addition to ventilated hydrothermal circulation as generally accepted. These estimates may bear on important problems in the physics and chemistry of the Earth because the magnitude of ventilated hydrothermal power affects chemical exchanges between the oceans and the lithosphere, thereby affecting both thermal and chemical budgets in the oceanic crust and lithosphere, the subduction factory, and the convective mantle.

Numerical models for hydrothermal circulation in the oceanic crust

1976 ◽  
Vol 81 (17) ◽  
pp. 3007-3012 ◽  
Author(s):  
R. J. Ribando ◽  
K. E. Torrance ◽  
D. L. Turcotte
Keyword(s):  
Oceanic Crust ◽  
Numerical Models ◽  
Hydrothermal Circulation

scholarly journals Seismic Structure of the Oceanic Crust Around Petit‐Spot Volcanoes in the Outer‐Rise Region of the Japan Trench

2018 ◽  
Vol 45 (20) ◽  
Author(s):  
Akane Ohira ◽  
Shuichi Kodaira ◽  
Gou Fujie ◽  
Tetsuo No ◽  
Yasuyuki Nakamura ◽  
...  
Keyword(s):  
Oceanic Crust ◽  
Japan Trench ◽  
Seismic Structure ◽  
Outer Rise

scholarly journals The hydrothermal power of oceanic lithosphere

2015 ◽  
Vol 7 (1) ◽  
pp. 1163-1207 ◽  
Author(s):  
C. J. Grose ◽  
J. C. Afonso
Keyword(s):  
Heat Flow ◽  
Heat Transport ◽  
Oceanic Crust ◽  
Effective Properties ◽  
Oceanic Lithosphere ◽  
Hydrothermal Circulation ◽  
Power Estimate ◽  
Heat Transport Properties ◽  
Lower Heat ◽  
The Difference

Abstract. We have estimated the power of ventilated hydrothermal heat transport, and its spatial distribution, using a set of recently developed plate models which highlight the effects of hydrothermal circulation and thermal insulation by oceanic crust. Testing lithospheric cooling models with these two effects, we estimate that global advective heat transport is about 6.6 TW, significantly lower than previous estimates, and that the fraction of that extracted by vigorous circulation on the ridge axes (<1 Ma) is about 50% of the total, significantly higher than previous estimates. This low hydrothermal power estimate originates from the thermally insulating properties of oceanic crust in relation to the mantle. Since the crust is relatively insulating, the effective properties of the lithosphere are "crust dominated" near ridge axes (yielding lower heat flow), and gradually approach mantle values over time. Thus, cooling models with crustal insulation predict low heat flow over young seafloor, implying that the difference of modeled and measured heat flow is due to the heat transport properties of the lithosphere, in addition to ventilated hydrothermal circulation as generally accepted. These estimates may bear on important problems in the physics and chemistry of the Earth because the magnitude of hydrothermal power affects chemical exchanges between the oceans and the lithosphere, thereby affecting both thermal and chemical budgets in the oceanic crust and lithosphere, the subduction factory, and convective mantle.

Heat-flow and hydrothermal circulation at the ocean–continent transition of the eastern gulf of Aden

2010 ◽  
Vol 295 (3-4) ◽  
pp. 554-570 ◽  
Author(s):  
Francis Lucazeau ◽  
Sylvie Leroy ◽  
Frédérique Rolandone ◽  
Elia d'Acremont ◽  
Louise Watremez ◽  
...  
Keyword(s):  
Heat Flow ◽  
Gulf Of Aden ◽  
Hydrothermal Circulation

scholarly journals Along‐trench variations in the seismic structure of the incoming Pacific plate at the outer rise of the northern Japan Trench

2016 ◽  
Vol 43 (2) ◽  
pp. 666-673 ◽  
Author(s):  
Gou Fujie ◽  
Shuichi Kodaira ◽  
Takeshi Sato ◽  
Tsutomu Takahashi
Keyword(s):  
Pacific Plate ◽  
Japan Trench ◽  
Seismic Structure ◽  
Outer Rise ◽  
Northern Japan
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