Paleogeothermal influence on organic metamorphism in the neotectonics of the Japanese Islands

Aihara, Atsuo

doi:10.1016/0040-1951(89)90135-2

Cited by 12 publications

(12 citation statements)

References 7 publications

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“…Although the uplift and cooling history of the Shimanto Belt on Kyushu has not yet been quantified using fission-track analysis, this area (just as within southern Shikoku) likewise was affected by intrusive activity during a time interval of 13 to 15 Ma (Shibata and Nozawa, 1967;Oba, 1977). The Paleogene strata there yield %R m values as high as 4.0%; in addition, vertical maturation gradients are on the order of 0.1%R m /100 m, and spatial patterns of organic metamorphism clearly overprint the structural architecture of the accreted section (Aihara, 1989). Values of illite crystallinity for these rocks have been reported by DiTullio and Hada (this volume), and they are generally consistent with conditions of advanced diagenesis and incipient greenschist-facies metamorphism.…”

Section: Coeval Rocks In Southwest Japansupporting

confidence: 82%

“…Stratigraphically above the Shimanto strata of eastern Kyushu, there is a pronounced decrease in %R m values (to <0.5%), as well as a sharp deflection in the vertical %R m gradient at the unconformable contact with upper Miocene sequences of the Miyazaki Group (Aihara, 1989). The gap in %R m values corresponds to a paleotemperature contrast across the unconformity of approximately 75°C.…”

Section: Coeval Rocks In Southwest Japanmentioning

confidence: 96%

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The effects of ridge subduction on the thermal structure of accretionary prisms: A Tertiary example from the Shimanto Belt of Japan

Underwood

Byrne²,

Hibbard³

et al. 1993

Geological Society of America Special Papers

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The Shimanto accretionary complex on the Muroto Peninsula of Shikoku comprises two major units of Tertiary strata: the Murotohanto subbelt (Eocene-Oligocene) and the Nabae subbelt (Oligocene-Miocene). Field-based structural analyses and laboratory measurements of thermal maturity show that both subbelts were affected by thermal overprints long after the initial stages of accretion-related deformation. Paleotemperatures for the entire Tertiary section range from about 140 to 315°C, based upon mean vitrinite reflectance values of 0.9 to 5.0%R m . In general, older rocks of the Murotohanto subbelt display higher levels of thermal maturity and better cleavage than rocks of the Nabae subbelt. The Murotohanto subbelt also displays a spatial decrease in thermal maturity from south to north, and this pattern probably was caused by regionalscale differential uplift following peak heating. Conversely, the paleothermal structure exposed within the Nabae subbelt is fairly uniform, except for the local effects of mafic intrusions at the tip of Cape Muroto. The most important structural discontinuity to display a large component of post-metamorphic vertical offset is the Shiina-Narashi fault; this out-of-sequence thrust forms the boundary between hanging-wall rocks of the Murotohanto subbelt and the younger Nabae subbelt. Rapid heating of the Shimanto Belt evidently occurred immediately after a middleMiocene reorganization of the subduction boundary of southwest Japan. Whether or •Present addresses: DiTullio, 326 12th St., Apt. 2L, Downloaded from 152 M. B. Underwood and Others not all portions of the inherited (Eocene-Oligocene) paleothermal structure were overprinted during the middle Miocene remains controversial. Subduction prior to middle Miocene time probably involved the Kula, or fused Kula/Pacific, Plate. Hot oceanic lithosphere from the Shikoku Basin back-arc spreading ridge first entered the subduction zone at approximately 15 Ma; this event also coincided with the opening of the Sea of Japan and the rapid clockwise rotation of southwest Japan. Middle Miocene thermal overprints elsewhere in the Shimanto Belt are spatially related to and, therefore, probably synchronous with widespread acidic magmatism, local mafic intrusions, and formation of anthracite coals in the forearc. The Kii Peninsula of Honshu appears to be the hottest spot along the strike of the subduction zone; this locality may well correspond to the collision point between the Shimanto accretionary complex and the central ridge of the Shikoku Basin. However, the spreading ridge probably was unstable and disorganized at the time of the collision, which allowed widespread, strike-parallel flux of mantle heat and magma into the accretionary prism. Apatite fission-track data show that most of the Eocene-Oligocene Shimanto strata experienced differential uplift and cooling through the 100°C isotherm shortly after the ridge-trench collision (11 to 8 Ma).The Shimanto Belt provides an excellent example of an ancient accretionary complex that does not follow the...

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Section: Coeval Rocks In Southwest Japansupporting

confidence: 82%

Section: Coeval Rocks In Southwest Japanmentioning

confidence: 96%

The effects of ridge subduction on the thermal structure of accretionary prisms: A Tertiary example from the Shimanto Belt of Japan

Underwood

Byrne²,

Hibbard³

et al. 1993

Geological Society of America Special Papers

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“…Various Raman spectral features have been used for the evaluation of the metamorphic grade, which include intensity (i.e., height) ratio, area (i.e., integrated intensity) ratio, full width at half maximum (FWHM) of peaks, and center (peak) position of Raman bands (Beyssac et al, 2002;Rahl et al, 2005;Aoya et al, 2010;Kouketsu et al, 2014). To evaluate the thermal maturation of CM from Raman spectral features, we examined the intensity ratio of D1-and D2-bands (I D2 /I D1 ), the area ratio of D1-and D2-bands (A D2 /A D1 ), the FWHM of D2-band (FWHM-D2), and the center position of D2-band (Center-D2) for the gouge after the dry test at 1.3 m/s.…”

Section: R O and Raman Spectramentioning

confidence: 99%

“…(For interpretation of the references to color in this figure legend, the reader is referred to the web version of this article.) applied thermometers for CM are based on vitrinite reflectance (R o ) and the Raman spectra of CM grains and these methods have been used to estimate maximum temperature experienced by sedimentary and metamorphic rocks (e.g., Barker and Goldstein, 1990;Sweeney and Burnham, 1990;Beyssac et al, 2002;Aoya et al, 2010;Kouketsu et al, 2014). R o has also been applied for the detection of increased heating on faults (O'Hara, 2004;Sakaguchi et al, 2011).…”

Section: Introductionmentioning

confidence: 99%

Vitrinite reflectance and Raman spectra of carbonaceous material as indicators of frictional heating on faults: Constraints from friction experiments

Furuichi

Ujiie

Kouketsu

et al. 2015

Earth and Planetary Science Letters

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“…Thermal structures of different areas of the Shimanto Belt have been studied with IC and vitrinite reflectance (Mori & Taguchi 1988;Aihara 1989; Sakaguchi et al. 1992;DiTullio & Hada 1993;DiTullio et al 1993;Hibbard et al 1993;Laughland & Underwood 1993;Underwood et al 1993a).…”

Section: Introductionmentioning

confidence: 99%

Thermal structure and uplift of the Cretaceous Shimanto Belt, Kii Peninsula, Southwest Japan: An illite crystallinity and Mite b_o, lattice spacing study

Awan

Imura

1996

Island Arc

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Illite crystallinity (IC) and illite b, lattice spacing were measured across the Cretaceous Shimanto Belt, Kii Peninsula, Southwest Japan. For the IC survey, 103 samples of argillaceous rocks were analyzed from the central area and the western area of the belt. Values of IC (Kubler Index) vary between 0.28 and 0.71 A"20 and indicate diagenetic and anchizone metamorphism respectively. The IC distribution reveals two contrasting patterns of thermal maturity. The Hanazono Formation, exposed in the northern area of the belt, generally dips north, but IC values increase systematically from 0.28 A'20 in the north to 0.54 A"20 in the south and indicate an inverted thermal structure. Values in other formations vary widely in the southern area of the belt ranging between 0.45 and 0.71 A"20, but the values do not show any systematic change from north to south and on average remain almost constant. Illite b,, lattice spacing values for 56 samples vary between 9.006 and 9.041 A corresponding to intermediate pressure conditions of the metamorphic facies. These values, combined with paleotemperatures estimated from IC, indicate paleogeothermal gradients of 22 and 31"C/km for the northern and southern areas of the belt, respectively. The inverted thermal structure of the Hanazono Formation, together with a lower paleogeothermal gradient, possibly is a result of the subduction of a relatively cold oceanic plate during the Late Cretaceous. The higher geothermal gradient could be a product of late thermal overprinting caused by the later subduction of a comparatively younger and hotter oceanic plate during the Eocene.

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Paleogeothermal influence on organic metamorphism in the neotectonics of the Japanese Islands

Cited by 12 publications

References 7 publications

The effects of ridge subduction on the thermal structure of accretionary prisms: A Tertiary example from the Shimanto Belt of Japan

The effects of ridge subduction on the thermal structure of accretionary prisms: A Tertiary example from the Shimanto Belt of Japan

Vitrinite reflectance and Raman spectra of carbonaceous material as indicators of frictional heating on faults: Constraints from friction experiments

Thermal structure and uplift of the Cretaceous Shimanto Belt, Kii Peninsula, Southwest Japan: An illite crystallinity and Mite b_o, lattice spacing study

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Paleogeothermal influence on organic metamorphism in the neotectonics of the Japanese Islands

Cited by 12 publications

References 7 publications

The effects of ridge subduction on the thermal structure of accretionary prisms: A Tertiary example from the Shimanto Belt of Japan

The effects of ridge subduction on the thermal structure of accretionary prisms: A Tertiary example from the Shimanto Belt of Japan

Vitrinite reflectance and Raman spectra of carbonaceous material as indicators of frictional heating on faults: Constraints from friction experiments

Thermal structure and uplift of the Cretaceous Shimanto Belt, Kii Peninsula, Southwest Japan: An illite crystallinity and Mite bo, lattice spacing study

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Thermal structure and uplift of the Cretaceous Shimanto Belt, Kii Peninsula, Southwest Japan: An illite crystallinity and Mite b_o, lattice spacing study