A new Mesozoic isochron chart of the northwestern Pacific Ocean: Paleomagnetic and tectonic implications

Nakanishi, Masao; Tamaki, Kensaku; Kobayashi, Kazuo

doi:10.1029/92gl00022

Cited by 95 publications

(74 citation statements)

References 21 publications

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“…1) on the surrounding oceanfloor (NAKANISHI et al, 1989(NAKANISHI et al, , 1992. The ocean-floor on which this seamount chain is situated was formed between M14 and M11 (about 138 and 133 Ma) period according to KENT and GRAD-STEIN'S (1985) time scale.…”

Section: Geologic Settingmentioning

confidence: 99%

Paleomagnetism of the Joban Seamount Chain, Northwestern Pacific.

Masalu

Tamaki

Kobayashi

1993

J. geomagn. geoelec

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We conducted a detailed bathymetric and magnetic total force survey of five seamounts in the Joban seamount chain during cruise KH90-1 of the R/V HAKUHO MARU in 1990. The Joban seamount chain is situated to the east of the southern Japan Trench, trends along N53°E (oblique to magnetic anomaly lineations whose trend is N68°E) and extends over a distance of about 394 km. We applied three-dimensional magnetic inversion to each seamount. The three northern seamounts show relatively complex magnetization structures, whereas the two southern seamounts show simple magnetization structures. The latter yielded reliable results with VGPs (Virtual geomagnetic pole) at 55.5°N/348.9°E and 52.1°N/352.4°E. We estimated the ages of the two southern seamounts to be ca. 80 to 90 Ma by comparing their VGPs with known Pacific plate apparent polar wander path. We also estimated the ages for two guyot seamounts in the northern group to be ca. 110 to 130 Ma by backtracking their crests along crustal age-depth curve to sea level. The Joban seamount chain apparently shows presence of at least two groups of inclinations. This suggests that the origin of this seamount chain is not the passage of the Pacific plate over a single stationary hotspot.

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Section: Geologic Settingmentioning

confidence: 99%

Paleomagnetism of the Joban Seamount Chain, Northwestern Pacific.

Masalu

Tamaki

Kobayashi

1993

J. geomagn. geoelec

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“…1). Nakanishi et al (1992b) identified Anomaly M22 near this portion of the Marshalls. Using the time scale of Harland et al (1990), the crust beneath Limalok is -155 m.y.…”

Section: Guyot Descriptions and Comparisons To Modern Analogsmentioning

confidence: 99%

“…1). Extrapolation of magnetic lineations identified to the south of these two edifices (Nakanishi et al, 1992b) produces an estimated plate age of >160 m.y. using the time scale of Harland et al (1990).…”

Section: Guyot Descriptions and Comparisons To Modern Analogsmentioning

confidence: 99%

“…As in the case of Lo-En, the >160-m.y. plate age beneath Wodejebato is derived through extrapolation of magnetic anomalies identified in the southern Marshall Islands (Harland et al, 1990;Nakanishi et al, 1992b). The summit plateau of Wodejebato is about 43 km long and increases in width from <12 km in the southeast to >25 km in the northwest ( Fig.…”

Section: Guyot Descriptions and Comparisons To Modern Analogsmentioning

confidence: 99%

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Physiography and Architecture of Marshall Islands Guyots Drilled during Leg 144: Geophysical Constraints on Platform Development

Bergersen¹

1995

Proceedings of the Ocean Drilling Program, 144 Scientific Results

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Drilling during Ocean Drilling Program Leg 144 provided much needed stratigraphic control on guyots in the Marshall Islands. Information from geophysical surveys conducted before drilling and the ages and lithologies assigned to the sediments sampled during Leg 144 make it possible to compare the submerged platforms of Limalok, Lo-En, and Wodejebato with each other and with various islands and atolls in the Hawaiian and French Polynesian chains. The gross physiography and stratigraphy of the platforms drilled during Leg 144 are similar in many respects to modern islands and atolls in French Polynesia: perimeter ridges bound lagoon sediments, transition zones of clay and altered volcaniclastic sediments separate the shallow-water platform carbonates from the underlying volcanic flows, and basement highs rise toward the center of the platforms. Ridges extending from the flanks of these guyots conform in number to rift zones observed on Hawaiian volcanoes. Edifices appear to remain unstable after moving away from the hotspot swell on the basis of fault blocks perched along the flanks of the guyots.The apparent absence of an extensive carbonate platform on Lo-En, the 100-m-thick sequence of Late Cretaceous shallowwater carbonates on Wodejebato, and the 230-m-thick sequence of Paleocene to middle Eocene platform carbonates on Limalok relate to differing episodes of volcanism, uplift, and subsidence affecting platform development. I analyze three tectonic components to explain these differences in platform development: plate flexure, thermal subsidence of the plate, and edifice size. Flexure modeling on the Anewetak-Lo-En pair suggests that Lo-En lay slightly on the moat side of the flexural arch formed during the construction of Anewetak. The model results are consistent with the negligible difference between the depths to the top of the volcanic substrate of these two guyots and the slight tilting of the Lo-En summit plateau toward Anewetak. The stresses and subsidence associated with flexure of the plate may explain the high-backscatter, cone-and lobe-shaped features cropping out along the flat summit plateau of Lo-En and the absence of an appreciable accumulation of shallow-water carbonate sediments. Age controls on Pikinni-Wodejebato and Mili-Limalok are poor, but flexure modeling on these two pairs of edifices suggests that Pikinni and Wodejebato were probably constructed at approximately the same time, and that construction of a volcano to the south of Limalok may explain a southward fanning of seismic basement reflectors. Neither flexure nor thermal subsidence of the plate appears to be responsible for the demise of the carbonate platforms on top of Wodejebato and Limalok guyots, but uplift or subsidence caused by plate loading may have influenced stratal patterns within the carbonate sediments. Clearly, the use of submerged carbonate platforms drilled during Leg 144 as "dipsticks" for recording the history of Cretaceous sea-level fluctuations requires a better understanding of the sequence and timing ...

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“…The Japanese Lineation set, which is a Mesozoic magnetic anomaly lineation, exists in the East Mariana Basin, east of the Mariana Trench (Nakanishi et al 1992a), leading Nakanishi et al (1992b) to propose that the subducting plate along the southern part of the Mariana Trench is a part of the Pacific plate formed in the Mesozoic. The Japanese Lineation set has two strikes.…”

Section: Topographic Features Around the Challenger Deepmentioning

confidence: 99%

A precise bathymetric map of the world’s deepest seafloor, Challenger Deep in the Mariana Trench

Nakanishi

Hashimoto

2011

Mar Geophys Res

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Data from three bathymetric surveys by R/V Kairei using a 12-kHz multibeam echosounder and differential GPS were used to create an improved topographic model of the Challenger Deep in the southwestern part of the Mariana Trench, which is known as the deepest seafloor in the world. The strike of most of the elongated structures related to plate bending accompanied by subduction of the Pacific plate is N70°E and is not parallel to the trench axis. The bending-related structures were formed by reactivation of seafloor spreading fabric. Challenger Deep consists of three en echelon depressions along the trench axis, each of which is 6-10 km long, about 2 km wide, and deeper than 10,850 m. The eastern depression is the deepest, with a depth of 10,920 ± 5 m.

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A new Mesozoic isochron chart of the northwestern Pacific Ocean: Paleomagnetic and tectonic implications

Cited by 95 publications

References 21 publications

Paleomagnetism of the Joban Seamount Chain, Northwestern Pacific.

Paleomagnetism of the Joban Seamount Chain, Northwestern Pacific.

Physiography and Architecture of Marshall Islands Guyots Drilled during Leg 144: Geophysical Constraints on Platform Development

A precise bathymetric map of the world’s deepest seafloor, Challenger Deep in the Mariana Trench

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