Paleogene Counterclockwise Rotation of the Celebes Sea-Orientation of ODP Cores Utilizing the Secondary Magnetization

Shibuya, H.; Merrill, Dean L; Hsu, Vindell

doi:10.2973/odp.proc.sr.124.169.1991

Cited by 34 publications

(29 citation statements)

References 11 publications

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“…Results from discrete sample demagnetization also provide an opportunity to evaluate the accuracy of archive-half core remanence data that are used (in combination with discrete sample results) to reorient core pieces to a common geographic framework. This paleomagnetic core reorientation method has been successfully used for both continental and oceanic outcrops (e.g., Fuller, 1969;Kodama, 1984;Shibuya et al, 1991). Assuming the direction of stable remanent magnetization (either viscous remanent magnetization or primary magnetization) with respect to a common reference line that is scribed the length of the core represents the expected magnetic direction at the site, the orientation of paleomagnetic ChRM, which specifies the rotation of the core relative to the geographic coordinates, is then used to restore the core azimuth.…”

Section: Paleomagnetic Stability Tests and Core Orientationmentioning

confidence: 99%

Expedition 316 Site C0006

Kinoshita¹,

Tobin²,

Ashi³

et al. 2009

Proceedings of the IODP

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Section: Paleomagnetic Stability Tests and Core Orientationmentioning

confidence: 99%

Expedition 316 Site C0006

Kinoshita¹,

Tobin²,

Ashi³

et al. 2009

Proceedings of the IODP

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“…Thus, in some cases, the direction of VRM components can be used as the magnetic north for the drilled core samples. Shibuya et al (1991) successfully applied this method to Leg 124 cores for a paleomagnetic reconstruction of the Celebes Sea Basin.…”

Section: Declination and Tectonic Rotationmentioning

confidence: 99%

Paleomagnetic Evidence for Northward Drift and Clockwise Rotation of the Izu-Bonin Forearc since the Early Oligocene

Koyama¹,

Cisowski²,

Pézard³

1992

Proceedings of the Ocean Drilling Program

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A paleomagnetic study was made on the deep-marine sediments and volcanic rocks drilled by Ocean Drilling Program Leg 126 in the Izu-Bonin forearc region (Sites 787, 792, and 793). This study evaluates the sense and amount of the tectonic drift and rotation associated with the evolution of the Philippine Sea Plate and the Izu-Bonin Arc. Alternating-field and thermal demagnetization experiments show that most of the samples have stable remanence and are suitable for paleomagnetic studies. Paleomagnetic declinations were recovered by two methods of core orientation, one of which uses a secondary viscous magnetization vector of each specimen as an orientation standard, and the other of which is based on the data of downhole microresistivity measurement obtained by using a formation microscanner. Oligocene to early Miocene samples show 10° to 14°s hallower paleolatitudes than those of the present. Middle Miocene to early Oligocene samples show progressive clockwise deflections (up to ~80°) in declination with time. These results suggest large northward drift and clockwise rotation of the Izu-Bonin forearc region since early Oligocene time. Considering previous paleomagnetic results from the other regions in the Philippine Sea, this motion may reflect large clockwise rotation of the whole Philippine Sea Plate over the past 40 m.y.

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“…The former led to the interpretation that the remanence is an isothermal remanent magnetization (IRM) that is acquired in the axial field within core barrels, although it was noted that the IRM might be supplemented by some form of grain realignment caused by coring-related vibration and fluidization of the cores (Stokking et al, 1993). The variability of the moment from site to site was thought to reflect variation in lithology and magnetic properties of the sediment (Shibuya et al, 1991).…”

Section: Review Of Previous Workmentioning

confidence: 99%

Coring-induced magnetization of recovered sediment

Fuller¹,

Hastedt²,

Herr³

1998

Proceedings of the Ocean Drilling Program, 157 Scientific Results

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Shipboard measurements of archived advanced piston corer (APC) cores during Leg 157 revealed a preponderance of radially inward-directed magnetization. The nature of the radial magnetization was investigated with tests on a wash core. The coring-induced magnetization has higher coercivity than a simple isothermal remanent magnetization (IRM). Well-lithified samples do not have this coring-induced, high-coercivity contamination. The coring-induced moment, therefore, appears to be related to the coring or recovery process in relatively poorly lithified sediments.The magnetic fields of bottom-hole assemblies (BHAs), APC barrels, and APC cutting shoes were measured as possible source fields for the drill moments. Fields of tens of mT were found in the core barrels, with fields only 1 order of magnitude smaller at the cutting edge of the shoes. The fields associated with the BHAs were weaker and fell off rapidly on the scale length of the drill bit. The coring-induced magnetization appears to be caused by the mechanical disturbance of sediments during coring, pull-out, or passage up the drill string in the presence of the field of the APC barrel.

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Paleogene Counterclockwise Rotation of the Celebes Sea-Orientation of ODP Cores Utilizing the Secondary Magnetization

Cited by 34 publications

References 11 publications

Expedition 316 Site C0006

Expedition 316 Site C0006

Paleomagnetic Evidence for Northward Drift and Clockwise Rotation of the Izu-Bonin Forearc since the Early Oligocene

Coring-induced magnetization of recovered sediment

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