Paleocurrent patterns of the sedimentary sequence of the Taitao ophiolite constrained by anisotropy of magnetic susceptibility and paleomagnetic analyses

Veloso, Eugenio E.; Anma, Ryo; Ota, Tsutomu; Komiya, Tsuyoshi; Kagashima, Shin Ichi; Yamazaki, T.

doi:10.1016/j.sedgeo.2007.07.005

Cited by 33 publications

(23 citation statements)

References 30 publications

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“…Because of its location, and the fact that its apparent age is the same as the well-characterized Hole 504B Pacific crust (1°13.6 0 N, 83°43.8 0 W) (Anma et al, 2006), the tectonic setting for this ophiolite is presumed to be relatively well constrained. It likely formed during a series of collisions of segments of the Chile Ridge system (Forsythe et al, 1986;Nelson et al, 1993;Guivel et al, 1999;Veloso et al, 2005), and most probably represents a mid-oceanic ridge section (Bourgois et al, 1993;Guivel et al, 1999;Veloso et al, 2005Veloso et al, , 2007Shibuya et al, 2007). Consistent with this, Klein and Karsten (1995) reported that trace element characteristics of lavas from the southern Chile Ridge are similar to the majority of MORB and other ocean-ridge basalts.…”

Section: Regional Geologymentioning

confidence: 83%

Chemical and chronologic complexity in the convecting upper mantle: Evidence from the Taitao ophiolite, southern Chile

Schulte

Schilling

Anma

et al. 2009

Geochimica et Cosmochimica Acta

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Section: Regional Geologymentioning

confidence: 83%

Chemical and chronologic complexity in the convecting upper mantle: Evidence from the Taitao ophiolite, southern Chile

Schulte

Schilling

Anma

et al. 2009

Geochimica et Cosmochimica Acta

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“…This result is partly because of the limited data. Anma et al (2009a) reported detrital zircon ages from a sedimentary rock interbedded within volcanic rocks in the Taitao ophiolite (Veloso et al, 2007), but did not find Late Permian to Jurassic zircon.…”

Section: Incoming Materials and Its Incorporation Into Magmamentioning

confidence: 99%

Shallow-depth melt eduction due to ridge subduction: LA-ICPMS U-Pb igneous and detrital zircon ages from the Chile Triple Junction and the Taitao Peninsula, Chilean Patagonia

Anma

Orihashi

2013

Geochem. J.

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“…Foliation (plane of long and intermediate axes) usually is parallel to the bedding plane, and lineation (long axis) is parallel or normal to the paleocurrent direction. For fine sediments, such as silt-clayey silt, the paleocurrent direction is tilting of the short axis relative to the horizontal plane [26,27]. Under moderate to low currents (<1 cm/s), paleocurrent directions point to the compound vector of the short axis and bedding plane [26].…”

Section: Ams Direction During Different Climate Periods In the Last 4mentioning

confidence: 99%

Turbidite and bottom-current evolution revealed by anisotropy of magnetic susceptibility of redox sediments in the Ulleung Basin, Sea of Japan

Shi

Liu

et al. 2011

Chin. Sci. Bull.

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Anisotropy of magnetic susceptibility (AMS) from above and below 7.31 m in a core from the southern Ulleung Basin shows clear differences on an equal area projection of the lower hemisphere. Rather concentrated steep inclination of K 3 and horizontal inclination of K 1 and K 2 (K 1 ≥K 2 ≥K 3 ) are located within the upper part, and the latter two axes lie perpendicular to each other near the bedding plane. In contrast, random distribution of the three axes and extremely high value of shape parameters (Q=(K 1 K 2 )/ [(K 1 +K 2 )/2K 3 ]) are evident in the lower part, indicating complete destruction of the original sedimentary structure. This result is consistent with data from X-radiographs, which show numerous conglomerates, distortions and cleavages in the lower part. According to age models by Liu et al. (2010) and , the bottom age at 7.31 m is 48 cal ka BP, and the time domain is discussed below. The degree of AMS (P) is low, 1-1.08, and linearly related to the foliation (F) (R 2 =0.95, N=176). The relationship between F and linearity (L) implies oblate aligning patterns that are typically sedimentary in origin. At least five redox couplets were found with the aid of S ratios and other rock magnetic parameters, and in most cases, the original signals of climate survived early diagenesis. The paleomagnetically reoriented AMS show corresponding changes with millennial events in the last 48 cal ka. Clearly tilted K 3 directions and reduction of P and F occurred within DO1-BA warm events, when melt water pulse 1A nd the YD cold event took place. The turbulent conditions therein, synchronous with coarsening of sediments, provide evidence of strong bottom currents and possible directional changes, as evidenced by different K 3 tilting directions. A NE current direction in the last 4.5 cal ka is consistent with in situ measurements of bottom currents. Responses of AMS, mainly to climatic modulation, show on the one hand, the limited influence of diagenesis on rock magnetic signals and, on the other hand, the dramatic change of hydrodynamic conditions and terrigenous inputs during rapid sea level rise during the last deglaciation. Ulleung Basin, AMS, susceptibility ellipsoid, early diagenesis Citation:Ge S L, Shi X F, Liu Y G, et al. Turbidite and bottom-current evolution revealed by anisotropy of magnetic susceptibility of redox sediments in the

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Paleocurrent patterns of the sedimentary sequence of the Taitao ophiolite constrained by anisotropy of magnetic susceptibility and paleomagnetic analyses

Cited by 33 publications

References 30 publications

Chemical and chronologic complexity in the convecting upper mantle: Evidence from the Taitao ophiolite, southern Chile

Chemical and chronologic complexity in the convecting upper mantle: Evidence from the Taitao ophiolite, southern Chile

Shallow-depth melt eduction due to ridge subduction: LA-ICPMS U-Pb igneous and detrital zircon ages from the Chile Triple Junction and the Taitao Peninsula, Chilean Patagonia

Turbidite and bottom-current evolution revealed by anisotropy of magnetic susceptibility of redox sediments in the Ulleung Basin, Sea of Japan

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