Molina Garza, Roberto S. and Fuller, Mike (2002): Paleolatitudes and magnetostratigraphy for Cenozoic sediments, ODP Leg 182: the Great Australian Bight

Leg/Site/Hole:
ODP 182
Identifier:
2002-058171
georefid

Creator:
Molina Garza, Roberto S.
Universidad Nacional Autonoma de Mexico, Unidad de Investigacion en Ciencias de la Tierra, Queretaro, Mexico
author

Fuller, Mike
University of Hawaii, United States
author

Identification:
Paleolatitudes and magnetostratigraphy for Cenozoic sediments, ODP Leg 182: the Great Australian Bight
2002
Earth, Planets and Space
Terra Scientific Publishing Company (TERRAPUB), Tokyo, Japan
54
4
399-413
Cenozoic northward drift of the Australian plate was determined from paleomagnetism of Middle Eocene through Pleistocene sediment cores from ODP Leg 182 (Sites 1126, 1128, and 1134) in the Great Australian Bight. Paleolatitude estimates are based on stepwise AF and thermal demagnetization of approximately 400 discrete samples, of which approximately 250 provided reliable data. The characteristic magnetization of the sediments resides in magnetite and magnetic sulfides. Middle Eocene through Lower Oligocene ( approximately 36 Ma) paleolatitudes of approximately 52 degrees (+ or -2 degrees ?) change gradually to Late Miocene ( approximately 9 Ma) paleolatitudes of approximately 48 degrees (+ or -2 degrees ). These data, combined with Australian paleomagnetic pole data, indicate a slow rate of northward motion through much of the Cenozoic ( approximately 28 mm/yr). These data also indicate an abrupt acceleration in the Late Miocene (drift rate approximately 115 mm/yr), coinciding with tectonic events in Southeast Asia. Paleolatitude estimates support Miocene versions of the Australian apparent polar wander path that place the Oligocene-Miocene pole ( approximately 25 Ma) at approximately 70 degrees S-125 degrees E and the Late Miocene pole at approximately 70 degrees S-105 degrees E (e.g., Idnurm, 1985, 1994). Inclination data for discrete samples also provide a refined magnetostratigraphy for portions of the Miocene, Oligocene, and Eocene carbonate and siliciclastic section of the Great Australian Bight.
English
Serial
Coverage:Geographic coordinates:
North:-33.1720
West:127.1500East: 128.5500
South:-34.2330

Stratigraphy; Cenozoic; Eocene; Great Australian Bight; Indian Ocean; Leg 182; magnetization; magnetostratigraphy; Miocene; natural remanent magnetization; Neogene; Ocean Drilling Program; Oligocene; Paleogene; paleolatitude; paleomagnetism; remanent magnetization; sediments; Tertiary;

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