Seismogenic zone temperatures and heat-flow anomalies in the To-nankai margin segment based on temperature data from IODP expedition 333 and thermal model

Marcaillou, Boris; Henry, Pierre; Kinoshita, Masataka; Kanamatsu, Toshiya; Screaton, E.; Daigle, Hugh; Harcouët-Menou, Virginie; Lee, Young-Min; Matsubayashi, Osamu; Thu, Moe Kyaw; Kodaira, Shuichi; Yamano, Makoto

doi:10.1016/j.epsl.2012.06.048

Cited by 25 publications

(38 citation statements)

References 92 publications

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“…However, constraints on the age of the oldest sediments at the base of C0012 are compatible with Kashinozaki Knoll having the same age (about 20 Ma) as the lithosphere in this part of the Shikoku Basin as indicated from magnetic anomalies (Chamot-Rooke et al, 1987;Okino et al, 1994). When compared with models, heat flow at Site C0011 appears slightly lower that the heat flow expected for a 20-Ma lithosphere (Kinoshita et al, 2008) but can be fit within uncertainties once the effect of sedimentation in the trench is taken into account (Marcaillou et al, 2012). Large-scale heat transfer from depth within the subduction zone to the trench by convection in the crust, as proposed for the Muroto transect to the west (Spinelli and Wang, 2008), appears unlikely on the Kumano transect because the heat flow remains moderate in the trench.…”

Section: Heat Flow and Convectionsupporting

confidence: 50%

“…333 constrain heat flow in the trench and provide a reliable seaward boundary condition for modeling of temperature along the subduction interface (Marcaillou et al, 2012). A sharp contrast in physical properties in the Shikoku Basin hemipelagites is interpreted as a diagenetic boundary, present throughout the basin, and related to the diagenesis of high-silica volcanic ash.…”

Section: Discussionmentioning

confidence: 99%

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Henry

Kanamatsu

Moe

et al. 2012

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Section: Heat Flow and Convectionsupporting

confidence: 50%

Section: Discussionmentioning

confidence: 99%

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Henry

Kanamatsu

Moe

et al. 2012

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“…For the Philippine Sea Plate, minimum ages of 20-21 Myr (early Miocene) were estimated [Marcaillou et al, 2012]. Nowadays, the deformation front is located about 80-160 km southeast off the Kii Peninsula, SW Japan .…”

Section: Tectonic and Geological Settingmentioning

confidence: 99%

“…Nowadays, the deformation front is located about 80-160 km southeast off the Kii Peninsula, SW Japan . In our working area in the Kumano forearc basin the top of the subducting plate was proposed to be located at depths between about 10 and 20 kmbsf [Marcaillou et al, 2012;Moore and Saffer, 2001]. …”

Section: Tectonic and Geological Settingmentioning

confidence: 99%

“…In our study area, the plate boundary thrust dips from about 10 km depth (SE edge) to >20 km depth (NW edge) and thermal modeling revealed temperatures between about 150 and 350 C at respective depths [Marcaillou et al, 2012;Moore and Saffer, 2001]. With respect to (i) temperatures at the interplate boundary, (ii) the distance between its top and the seafloor, and (iii) the assumed preferential nonvertical transport of fluids generated at the interplate boundary via OOSSs to more seaward sites, it appears most probable that hydrocarbons mobilized during MV activity are derived from the old accreted sediments overlying the seismogenic zone ( Figure 6).…”

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Hydrocarbon seepage and its sources at mud volcanoes of the Kumano forearc basin, Nankai Trough subduction zone

Pape

Geprägs

Hammerschmidt

et al. 2014

Geochem Geophys Geosyst

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Twelve submarine mud volcanoes (MV) in the Kumano forearc basin within the Nankai Trough subduction zone were investigated for hydrocarbon origins and fluid dynamics. Gas hydrates diagnostic for methane concentrations exceeding solubilities were recovered from MVs 2, 4, 5, and 10. Molecular ratios (C 1 /C 2 < 250) and stable carbon isotopic compositions (d 13 C-CH 4 >240& V-PDB) indicate that hydratebound hydrocarbons (HCs) at MVs 2, 4, and 10 are derived from thermal cracking of organic matter. Considering thermal gradients at the nearby IODP Sites C0009 and C0002, the likely formation depth of such HCs ranges between 2300 and 4300 m below seafloor (mbsf). With respect to basin sediment thickness and the minimum distance to the top of the plate boundary thrust we propose that the majority of HCs fueling the MVs is derived from sediments of the Cretaceous to Tertiary Shimanto belt below Pliocene/Pleistocene to recent basin sediments. Considering their sizes and appearances hydrates are suggested to be relicts of higher MV activity in the past, although the sporadic presence of vesicomyid clams at MV 2 showed that fluid migration is sufficient to nourish chemosynthesis-based organisms in places. Distributions of dissolved methane at MVs 3, 4, 5, and 8 pointed at fluid supply through one or few MV conduits and effective methane oxidation in the immediate subsurface. The aged nature of the hydrates suggests that the major portion of methane immediately below the top of the methane-containing sediment interval is fueled by current hydrate dissolution rather than active migration from greater depth.

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Distribution of gas hydrates on continental margins by means of a mathematical envelope: A method applied to the interpretation of 3D Seismic Data

Bale

Alves

Moore

2014

Geochem Geophys Geosyst

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[1] A 3D seismic volume from the Nankai Trough accretionary wedge (SE Japan) is used to evaluate the subsurface distribution of gas hydrates as a function of structural and stratigraphic complexity, variable heat flow patterns and the presence of subsurface fluid conduits. Eleven equations were modified for depth, pressure, and temperature, modeled in 3D, and compared with the distribution of BottomSimulating Reflections (BSRs) offshore Nankai. The results show that the equations produce overlapping-and thus potentially consistent-predictions for the distribution of BSRs, leading us to propose the concept of a ''BSR Stability Envelope'' as a method to quantify the subsurface distribution of gas hydrates on continental margins. In addition, we show that the ratio (R) between shallow and deep BSRs of seven subenvelopes, which are defined by BSR stability equations, indicates local gas hydrate equilibrium conditions. Values of R < 1 relate to cooler regions, whereas when R > 1 the majority of BSRs are located in warmer structural traps. The method in this paper can be used to recognize any divergence between observed and theoretical depths of occurrence of BSRs on 3D or 4D (time lapse) seismic volumes. In the Nankai Trough, our results point out for equilibrium conditions in BSRs located away from the Megasplay Fault Zone and major thrust faults. This latter observation demonstrates the applicability of the method to: (a) the recognition of subsurface fluid conduits and (b) the prediction of maximum and minimum depths of occurrence of gas hydrates on continental margins, under distinct thermal and hydrologic conditions.

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Seismogenic zone temperatures and heat-flow anomalies in the To-nankai margin segment based on temperature data from IODP expedition 333 and thermal model

Cited by 25 publications

References 92 publications

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Scientific Drilling

Hydrocarbon seepage and its sources at mud volcanoes of the Kumano forearc basin, Nankai Trough subduction zone

Distribution of gas hydrates on continental margins by means of a mathematical envelope: A method applied to the interpretation of 3D Seismic Data

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