Evidence for multiple paleomagnetic intensity lows between 30 and 50 ka BP from a western Equatorial Pacific sedimentary sequence

被引：22

作者：

Blanchet, CL ^{[1
]}

Thouveny, N ^{[1
]}

de Garidel-Thoron, T ^{[1
]}

机构：

[1] Univ Paul Cezanne, CNRS, CEREGE, F-13545 Aix En Provence 04, France

来源：

QUATERNARY SCIENCE REVIEWS | 2006年 / 25卷 / 9-10期

关键词：

D O I：

10.1016/j.quascirev.2005.09.001

中图分类号：

P9 [自然地理学];

学科分类号：

0705 ; 070501 ;

摘要：

A paleomagnetic study was carried out on the radiocarbon dated MD97-2134 core located in the western Equatorial Pacific (Southern Papua New Guinea margin). Rock magnetic investigations revealed changes of the magnetic mineralogy along the hemi-pelagic sedimentary sequence but the reconstruction of past direction and relative paleointensity variations of the geomagnetic field remained feasible. Four successive paleointensity drops are recorded between 30 and 50 ka BP. The largest one is associated with an abrupt swing of declination and inclination interpreted as a smoothed signature of the Laschamp excursion (similar to 41 ka BP). The Succession of four events of weak intensity between 30 and 50 ka BP introduces a complex behaviour of the geomagnetic field in the time interval spanning over the Laschamp and the Mono Lake excursions. (c) 2005 Elsevier Ltd. All rights reserved.

引用

页码：1039 / 1052

页数：14

共 40 条

[1] Geochemical and geophysical implications of the radiocarbon calibration [J].

Bard, E .

GEOCHIMICA ET COSMOCHIMICA ACTA, 1998, 62 (12) :2025-2038

[2] Age of the Mono Lake excursion and associated tephra [J].

Benson, L ;

Liddicoat, J ;

Smoot, J ;

Sarna-Wojcicki, A ;

Negrini, R ;

Lund, S .

QUATERNARY SCIENCE REVIEWS, 2003, 22 (2-4) :135-140

[3] PALEOMAGNETISM AND POTASSIUM ARGON AGE DETERMINATIONS OF LASCHAMP GEOMAGNETIC POLARITY EVENT [J].

BONHOMMET, N ;

ZAHRINGER, J .

EARTH AND PLANETARY SCIENCE LETTERS, 1969, 6 (01) :43-+

[4]

BONHOMMET N, 1967, PRESENCE AIMANTATION, P92

[5] A high resolution authigenic 10Be/9Be record of geomagnetic moment variations over the last 300 ka from sedimentary cores of the Portuguese margin [J].

Carcaillet, J ;

Bourlès, DL ;

Thouveny, N ;

Arnold, M .

EARTH AND PLANETARY SCIENCE LETTERS, 2004, 219 (3-4) :397-412

[6] Pseudo-Hamiltonian-connected graphs [J].

Chang, GJ ;

Zhu, XD .

DISCRETE APPLIED MATHEMATICS, 2000, 100 (03) :145-153

[7] PaleoMac:: A Macintosh™ application for treating paleomagnetic data and making plate reconstructions -: art. no. 1007 [J].

Cogné, JP .

GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS, 2003, 4

[8] Evidence for large methane releases to the atmosphere from deep-sea gas-hydrate dissociation during the last glacial episode [J].

de Garidel-Thoron, T ;

Beaufort, L ;

Bassinot, F ;

Henry, P .

PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA, 2004, 101 (25) :9187-9192

[9] EVIDENCE THAT LASCHAMP POLARITY EVENT DID NOT OCCUR 13300-30 400 YEARS AGO [J].

DENHAM, CR ;

COX, A .

EARTH AND PLANETARY SCIENCE LETTERS, 1971, 13 (01) :181-&

[10] COSMIC-RAY INTENSITY AND GEOMAGNETISM [J].

ELSASSER, W ;

NEY, EP ;

WINCKLER, JR .

NATURE, 1956, 178 (4544) :1226-1227

← 1 2 3 4 →