Cenozoic northward translation of the Kitakami massif in northeast Japan: paleomagnetic evidence

Otofuji, Yo–ichiro; Sato, Ken; Iba, Nobuyuki; Matsuda, T.

doi:10.1016/s0012-821x(97)00163-5

Cited by 21 publications

(16 citation statements)

References 40 publications

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“…The inferred low latitude position for the South Kitakami massif during Cretaceous is consistent with plant assemblages (Ohana and Kimura, 1995), even though the original proposal of the northward translation mechanism with Pacific plate motion (Otofuji et al, 1997) is incompatible with the presence of voluminous acidic rocks and with the correlation of timing of magmatic events in the massif with that in some continental terranes in SW Japan (Sakashima et al, 2003).…”

Section: Sample Descriptionsupporting

confidence: 58%

“…Therefore, we correct the paleofield intensity to around 19.0∼28.6 μT. Using an inclination from Otofuji et al (1997), the corresponding VADM for ∼110 Ma is calculated as 4.9∼7.4 (×10 22 A m 2 ). We should note that this cooling time is for the entire complex.…”

Section: Discussionmentioning

confidence: 99%

“…119-114 Ma welded tuff in the region (Otofuji et al, 1997). No antipodal direction has been reported from granitoids, suggesting they have acquired NRM during the Cretaceous Normal Superchron (120 to 83 Ma).…”

Section: Sample Descriptionmentioning

confidence: 95%

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Nonlinear thermoremanence corrections for Thellier paleointensity experiments on single plagioclase crystals with exsolved magnetites: a case study for the Cretaceous Normal Superchron

Usui

Nakamura

2009

Earth Planet Sp

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Single plagioclase paleointensity experiment has been an excellent tool to reliably estimate ancient geomagnetic field intensity. Although transparent plagioclases with magmatic nanophase magnetites have shown their potential for paleointensity estimation, in most cloudy plagioclases with exsolved magnetites, the problems of strong anisotropy as rod-shape magnetites, the hyperbolic tangential saturation of thermoremanence (TRM), and slow cooling of host plutons need to be addressed. In this paper, we propose experimental schemes to address these problems with considerations of error estimation and uncertainty for paleointensity experiments on exsolved magnetite. First, in order to experimentally check the effect of the hyperbolic tangential saturation of TRM, we performed Thellier simulation experiments using laboratory total TRM as simulated natural remanence (NRM). Single cloudy plagioclases were sampled from early Cretaceous granite in the Kitakami massif, Northeast Japan. We designed the experiment where the total TRM and the partial TRMs in the Thellier experiments were acquired under different field intensities. For these experiments, correction for hyperbolic tangential TRM acquisition yielded precise field intensity estimations. Next, Thellier experiments on NRM of the crystals from the same granite were performed as a demonstration of correction schemes for both magnetic anisotropy and hyperbolic tangential TRM acquisition. Precise determination of anisotropy tensor seems to be the major challenge for single plagioclase paleointensity estimation with exsolved magnetite.

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Section: Sample Descriptionsupporting

confidence: 58%

Section: Discussionmentioning

confidence: 99%

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Nonlinear thermoremanence corrections for Thellier paleointensity experiments on single plagioclase crystals with exsolved magnetites: a case study for the Cretaceous Normal Superchron

Usui

Nakamura

2009

Earth Planet Sp

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“…Some of the Cretaceous and early Tertiary paleomagnetic directions within northeast Japan are characterized by anomalously shallow inclinations (e.g. Otofuji et al, 1997) implying a northward translation of the block. At present, the mechanism and path of the considerable lateral translation is unclear.…”

Section: Stage 1: Early Tertiary Configuration Of the Regional Volcanmentioning

confidence: 99%

Seismic evidence of divergent rifting and subsequent deformation in the southern Japan Sea, and a Cenozoic tectonic synthesis of the eastern Eurasian margin

Itoh

Uno

Arato

2006

Journal of Asian Earth Sciences

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“…The Harachiyama Formation was formed in the Early Cretaceous just before the intrusion of the Kitakami Granites and is believed to form a Cretaceous volcano-plutonic complex with the Kitakami plutons (Kanisawa, 1974). Felsic parts of the Harachiyama Formation do not show strong magnetic properties (Otofuji et al, 1997) but mafic-intermediate parts of the formation might cause magnetic anomalies because of magnetic susceptibilities as high as the Kitakami Granites (in preparation). Cretaceous mafic volcanic rocks were retrieved as cuttings from the bottom of the drill hole Off-Hachinohe (#1 in Fig.…”

Section: Himekami Plutonmentioning

confidence: 99%

Utility of petrophysical and geophysical data to constrain the subsurface structure of the Kitakami plutons, northeast Japan

Okuma

Kanaya

2005

Earth Planet Sp

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The Geological Survey of Japan (GSJ), AIST has been systematically measuring physical properties of basement rocks in Japan for more than 30 years and has started to construct a petrophysical database called PBRock 21 (Petrophysical Database of Basement rocks in Japan for the 21st Century, http://www.aist.go.jp/RIODB/ PB-Rock21/). The petrophysical data has been integrated with aeromagnetic data to determine the subsurface structure of the Himekami and Sobanokami plutons, members of the Kitakami plutonic belt, northeast Japan. For the Himekami pluton, the result of apparent magnetization intensity mapping clearly shows zonation within subplutons as well as regional rock type differences between the North (felsic) and South (felsic and mafic complex) sub-plutons. The bottom depths of the pluton were estimated by a successive 3-D magnetic modeling to be 1.7 km (North sub-pluton) and 1.5 km below sea level (South sub-pluton), respectively. Magnetic modeling of the Sobanokami pluton, which is partly exposed at the eastern edge of the Ishinomaki Plain, implies that the main part of the pluton extends to the northwest below the surface. Its western edge is cut by the Ishinomaki-wan fault, believed to be the upward extension of the fault plane of the 2003 northern Miyagi earthquake as defined by seismic observations and reflection seismic surveys conducted after the earthquake. Integrated magnetic and gravity modeling suggests that the Kakeyama Formation, a Neogene conglomerate deposited in a half-graben along the Ishinomaki-wan fault during Miocene rifting, contains more granitic fragments toward the south than to the north in the Ishinomaki Plain.

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Cenozoic northward translation of the Kitakami massif in northeast Japan: paleomagnetic evidence

Cited by 21 publications

References 40 publications

Nonlinear thermoremanence corrections for Thellier paleointensity experiments on single plagioclase crystals with exsolved magnetites: a case study for the Cretaceous Normal Superchron

Nonlinear thermoremanence corrections for Thellier paleointensity experiments on single plagioclase crystals with exsolved magnetites: a case study for the Cretaceous Normal Superchron

Seismic evidence of divergent rifting and subsequent deformation in the southern Japan Sea, and a Cenozoic tectonic synthesis of the eastern Eurasian margin

Utility of petrophysical and geophysical data to constrain the subsurface structure of the Kitakami plutons, northeast Japan

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