Buried Mesozoic volcanic–plutonic fronts of the north-western Pacific island arcs and their tectonic implications

Segawa, Jiro; Oshima, Shoichi

doi:10.1038/256015a0

Cited by 42 publications

(20 citation statements)

References 6 publications

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“…The first one has been well known (e.g. SEGAWA and OSHIMA, 1975). One may claim that this anomaly belt extends through Hokkaido further to the north.…”

Section: Magnetic Anomaly Mapmentioning

confidence: 94%

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A magnetic anomaly map in the Japanese region with special reference to tectonic implications.

Honkura¹,

Okubo²,

Nagaya³

et al. 1991

J. geomagn. geoelec

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Aeromagnetic surveys over the Japanese Islands yielded a detailed magnetic anomaly map. Magnetic anomaly maps were also derived for sea regions surrounding the Japanese Islands from ship-borne magnetic surveys. We combined these maps into a unified magnetic anomaly map for the entire Japanese island arc region. The map enables us to find some characteristic features; in particular, three similar anomaly belts are clearly recognized. We attempted to combine these belts into one linear belt, although they are spatially separated and the direction of elongation is different from one belt to another. This process requires rotations of the blocks constituting the Japanese Islands. The result of our reconstruction of the blocks agrees with the result derived from paleomagnetic studies, supporting the opening of the Japan Sea. This implies that magnetic anomalies serve as markers for the original locations of blocks, in a sense similar to yet slightly different from oceanic magnetic lineations in plate reconstruction.

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“…The first one has been well known (e.g. SEGAWA and OSHIMA, 1975). One may claim that this anomaly belt extends through Hokkaido further to the north.…”

Section: Magnetic Anomaly Mapmentioning

confidence: 94%

“…3. SEGAWA and OSHIMA, 1975). Assuming that A, B, C and D once constituted a long linear anomaly belt, we attempt to reconstruct Northeast and Southwest Japan, respectively.…”

Section: Reconstruction Of Continental Blocks Based On the Magnetic Amentioning

confidence: 99%

A magnetic anomaly map in the Japanese region with special reference to tectonic implications.

Honkura¹,

Okubo²,

Nagaya³

et al. 1991

J. geomagn. geoelec

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“…Counil et al [1991] suggest that juxtaposition of continental and oceanic crust of differing magnetization and thickness may account for Magsat anomalies at continental margins (including Japan and the Aleutians). The presence of strongly magnetic mafic rock layers in the lower crust beneath the volcanic arc may also contribute to the observed anomalies [Segawa and Oshima, 1975;Segawa and Furuta, 1978].…”

Section: Introductionmentioning

confidence: 99%

Magnetic petrology of arc xenoliths from Japan and Aleutian Islands

Warner¹,

Wasilewski²

1997

J. Geophys. Res.

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“…The MT data (Ogawa, 1992) show that at the coast, the plutons causing the magnetic anomaly belt are about 15 km thick. The positive anomaly belt was originally interpreted to be due to a Jurassic or early Cretaceous mafic dike or volcanic rocks (Ogawa and Suyama, 1975;Segawa and Oshima, 1975;Segawa and Furuta, 1978;Makino et al, 1992). The positive and negative stripes on the eastern side of the marine magnetic map (Fig.…”

Section: Aeromagnetic and Gravity Datamentioning

confidence: 99%

Magnetic and Gravity Constraints on Forearc Upper Crustal Structure and Composition, Offshore Northeast Japan.

Finn

1994

J. geomagn. geoelec

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Marine magnetic and gravity data from the northeast Japan forearc offer insight to the subsurface structure, density and magnetization from which geologic interpretations and tectonic reconstructions can be made. Positive marine magnetic anomalies, on-land geology, drill hole data, and 2-1/2-dimensional models reveal that Kitakami plutons and possibly their associated volcanic rocks constitute part of the modem forearc basement and lie 100-150 km further east than previously thought. A method to create magnetization and density contrast maps was employed to produce a three-dimensional picture of the forearc basement rock properties averaged over a 14-km thickness. Comparisons of the magnetization map with drill hole information suggest that Cretaceous andesites may contribute to the observed positive aeromagnetic anomalies and therefore, may be more magnetic than the sparse on-land rock property measurements suggest. The lower magnetization values for the area south of 40°N latitude than for the area to the north may indicate that the andesites are not present in the south and erosion was deeper there. The gravity data primarily reflect variations of density within marine sedimentary rocks and crustal thickness.

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Buried Mesozoic volcanic–plutonic fronts of the north-western Pacific island arcs and their tectonic implications

Cited by 42 publications

References 6 publications

A magnetic anomaly map in the Japanese region with special reference to tectonic implications.

A magnetic anomaly map in the Japanese region with special reference to tectonic implications.

Magnetic petrology of arc xenoliths from Japan and Aleutian Islands

Magnetic and Gravity Constraints on Forearc Upper Crustal Structure and Composition, Offshore Northeast Japan.

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