Termal history of the NE Japan frontal are since the Late Miocene inferred from vitrinite reflectante

Paleogeothermal gradients are estimated from the vitrinite reflectance-depth (Ro-z) relations of Middle to Late Miocene sediments in the Tanakura and Hirono áreas, Northeast Japan. Both areas have been situated in the frontal arc since 15 Ma and have been free from magmatism. Thus, the sediments wou...

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Author: Yamaji, Atsushi
Format: article
Status:Published version
Publication Date:1994
Country:México
Institution:UNIVERSIDAD NACIONAL AUTÓNOMA DE MÉXICO
Repository:Geofísica Internacional
Language:Spanish
OAI Identifier:oai:revistagi.geofisica.unam.mx:article/468
Online Access:http://revistagi.geofisica.unam.mx/index.php/RGI/article/view/468
Access Level:Open access
Keyword:Reflectancia de vitrinita
historia térmica
arco de islas
noreste de Japón
Vitrinite reflectance
thermal history
island arc
Northeast Japan
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spelling Termal history of the NE Japan frontal are since the Late Miocene inferred from vitrinite reflectanteTermal history of the NE Japan frontal are since the Late Miocene inferred from vitrinite reflectanteYamaji, AtsushiReflectancia de vitrinitahistoria térmicaarco de islasnoreste de JapónVitrinite reflectancethermal historyisland arcNortheast JapanPaleogeothermal gradients are estimated from the vitrinite reflectance-depth (Ro-z) relations of Middle to Late Miocene sediments in the Tanakura and Hirono áreas, Northeast Japan. Both areas have been situated in the frontal arc since 15 Ma and have been free from magmatism. Thus, the sediments would have undergone a limited amount of local, thermal disturbances, and are suitable for a study of regional-scale paleogeothermal conditions. Late Miocene to Early Pliocene uplift resulted in an angular unconformity between the Miocene and Pliocene rocks and caused cooling of the Miocene sediments that would have retarded and effectively stopped coalification. The Ro-z relations of the sediments therefore reveal the paleogeothermal gradient between deposition and unroofing. The estimated paleogeothermal gradient is 64Â11° C km-1 at Tanakura and 45Â10° C km-1 at Hirono. The present gradients are respectively 30° and 18° C km-1, indicating that subsurface temperature was higher in the Late Miocene than at present under the frontal arc. Cooling from the Pliocene through Quaternary appears to have been of regional scale across the arc, as is also suggested by the geochemical signature of volcanic rocks erupted at the volcanic front (Ban et al., 1992). Westward retreat of the volcanic front (Ohguchi et al., 1989) is also in accord with the regional cooling.Se estima los gradientes paleogeotérmicos a partir de las relaciones reflectancia de vitrinita-profundidad (-z) para sedimentos del Mioceno Tardío en las áreas de Tanakura y Hirono del noreste de Japón. Ambas áreas se han situado en la región ante arco desde hace 15 Ma y no han sido afectadas por magmatismo. Estos sedimentos debieron haber sufrido disturbios térmicos locales limitados, y por ello resultan adecuados para estudiar las condiciones paleogeotérmicas a una escala regional. El levantamiento que se llevo a cabo en la región, entre el Mioceno Tardío y el Plioceno Temprano dio como resultado una discordancia angular entre las rocas miocénicas y pliocénicas y causó el enfriamiento de los sedimentos del Mioceno, lo que pudo haber retardado y detenido en forma efectiva el proceso de carbonización. Las relaciones -z de los sedimentos, por lo tanto, revelan el gradiente geotérmico entre la depositación y el destechamiento. El gradiente paleogeotérmico estimado es de 64±11° en Takamura y de 45± 10° en Hirono. Los gradientes actuales son de 30° y 18° respectivamente, lo cual indica que la temperatura en el subsuelo fue mayor en el Mioceno Tardío que en el presente, debajo del ante-arco. Un enfriamiento de escala regional a través del arco parece haber tenido lugar a partir del Plioceno y durante todo el Cuaternario, tal como lo sugiere la firma geoquímica de las rocas volcánicas del frente volcánico (Ban et al., 1992). Un retroceso hacia el occidente del frente volcánico (Ohguchi et al., 1989) es consistente también con el enfriamiento regional.Universidad Nacional Autónoma de México. Instituto de Geofísica1994-01-01info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionapplication/pdfhttp://revistagi.geofisica.unam.mx/index.php/RGI/article/view/46810.22201/igeof.00167169p.1994.33.1.468Geofisica Internacional; Vol. 33 No. 1 (1994): January 1, 1994; 45-51Geofísica Internacional; Vol. 33 Núm. 1 (1994): Enero 1, 1994; 45-512954-436X0016-716910.22201/igeof.00167169p.1994.33.1reponame:Geofísica Internacionalinstname:UNIVERSIDAD NACIONAL AUTÓNOMA DE MÉXICOinstacron:UNAMspahttp://revistagi.geofisica.unam.mx/index.php/RGI/article/view/468/482Derechos de autor 2022 Geofisica Internacionalhttps://creativecommons.org/licenses/by-nc-sa/4.0/info:eu-repo/semantics/openAccessoai:revistagi.geofisica.unam.mx:article/4682024-08-16T17:31:53Z
dc.title.none.fl_str_mv Termal history of the NE Japan frontal are since the Late Miocene inferred from vitrinite reflectante
Termal history of the NE Japan frontal are since the Late Miocene inferred from vitrinite reflectante
title Termal history of the NE Japan frontal are since the Late Miocene inferred from vitrinite reflectante
spellingShingle Termal history of the NE Japan frontal are since the Late Miocene inferred from vitrinite reflectante
Yamaji, Atsushi
Reflectancia de vitrinita
historia térmica
arco de islas
noreste de Japón
Vitrinite reflectance
thermal history
island arc
Northeast Japan
title_short Termal history of the NE Japan frontal are since the Late Miocene inferred from vitrinite reflectante
title_full Termal history of the NE Japan frontal are since the Late Miocene inferred from vitrinite reflectante
title_fullStr Termal history of the NE Japan frontal are since the Late Miocene inferred from vitrinite reflectante
title_full_unstemmed Termal history of the NE Japan frontal are since the Late Miocene inferred from vitrinite reflectante
title_sort Termal history of the NE Japan frontal are since the Late Miocene inferred from vitrinite reflectante
dc.creator.none.fl_str_mv Yamaji, Atsushi
author Yamaji, Atsushi
author_facet Yamaji, Atsushi
author_role author
dc.subject.none.fl_str_mv Reflectancia de vitrinita
historia térmica
arco de islas
noreste de Japón
Vitrinite reflectance
thermal history
island arc
Northeast Japan
topic Reflectancia de vitrinita
historia térmica
arco de islas
noreste de Japón
Vitrinite reflectance
thermal history
island arc
Northeast Japan
description Paleogeothermal gradients are estimated from the vitrinite reflectance-depth (Ro-z) relations of Middle to Late Miocene sediments in the Tanakura and Hirono áreas, Northeast Japan. Both areas have been situated in the frontal arc since 15 Ma and have been free from magmatism. Thus, the sediments would have undergone a limited amount of local, thermal disturbances, and are suitable for a study of regional-scale paleogeothermal conditions. Late Miocene to Early Pliocene uplift resulted in an angular unconformity between the Miocene and Pliocene rocks and caused cooling of the Miocene sediments that would have retarded and effectively stopped coalification. The Ro-z relations of the sediments therefore reveal the paleogeothermal gradient between deposition and unroofing. The estimated paleogeothermal gradient is 64Â11° C km-1 at Tanakura and 45Â10° C km-1 at Hirono. The present gradients are respectively 30° and 18° C km-1, indicating that subsurface temperature was higher in the Late Miocene than at present under the frontal arc. Cooling from the Pliocene through Quaternary appears to have been of regional scale across the arc, as is also suggested by the geochemical signature of volcanic rocks erupted at the volcanic front (Ban et al., 1992). Westward retreat of the volcanic front (Ohguchi et al., 1989) is also in accord with the regional cooling.
publishDate 1994
dc.date.none.fl_str_mv 1994-01-01
dc.type.none.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
format article
status_str publishedVersion
dc.identifier.none.fl_str_mv http://revistagi.geofisica.unam.mx/index.php/RGI/article/view/468
10.22201/igeof.00167169p.1994.33.1.468
url http://revistagi.geofisica.unam.mx/index.php/RGI/article/view/468
identifier_str_mv 10.22201/igeof.00167169p.1994.33.1.468
dc.language.none.fl_str_mv spa
language spa
dc.relation.none.fl_str_mv http://revistagi.geofisica.unam.mx/index.php/RGI/article/view/468/482
dc.rights.none.fl_str_mv Derechos de autor 2022 Geofisica Internacional
https://creativecommons.org/licenses/by-nc-sa/4.0/
info:eu-repo/semantics/openAccess
rights_invalid_str_mv Derechos de autor 2022 Geofisica Internacional
https://creativecommons.org/licenses/by-nc-sa/4.0/
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
dc.publisher.none.fl_str_mv Universidad Nacional Autónoma de México. Instituto de Geofísica
publisher.none.fl_str_mv Universidad Nacional Autónoma de México. Instituto de Geofísica
dc.source.none.fl_str_mv Geofisica Internacional; Vol. 33 No. 1 (1994): January 1, 1994; 45-51
Geofísica Internacional; Vol. 33 Núm. 1 (1994): Enero 1, 1994; 45-51
2954-436X
0016-7169
10.22201/igeof.00167169p.1994.33.1
reponame:Geofísica Internacional
instname:UNIVERSIDAD NACIONAL AUTÓNOMA DE MÉXICO
instacron:UNAM
instname_str UNIVERSIDAD NACIONAL AUTÓNOMA DE MÉXICO
instacron_str UNAM
institution UNAM
reponame_str Geofísica Internacional
collection Geofísica Internacional
repository.name.fl_str_mv
repository.mail.fl_str_mv
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