Paleomagnetic of DSDP Leg 91 basalts and sediments


Autoria(s): Montgomery, Adair F; Johnson, H Paul
Cobertura

MEDIAN LATITUDE: -23.837800 * MEDIAN LONGITUDE: -165.590720 * SOUTH-BOUND LATITUDE: -23.853300 * WEST-BOUND LONGITUDE: -165.654500 * NORTH-BOUND LATITUDE: -23.822300 * EAST-BOUND LONGITUDE: -165.526800 * DATE/TIME START: 1983-01-21T00:00:00 * DATE/TIME END: 1983-02-12T00:00:00

Data(s)

22/11/1987

Resumo

Paleomagnetic studies were carried out on 23 basalt and 74 sediment samples from Leg 91 of the Deep Sea Drilling Project, recovered from a portion of the southwestern Pacific plate (24°S, 166°W) dating back to the Early Cretaceous to perhaps Late Jurassic. The expected geocentric axial dipole inclination at this latitude is -41°. The corrected mean stable inclination of -75° for the basalts indicates a paleolatitude of 63°S for their formation and thus 39° of northward motion during the last 100 m.y. Sediment inclinations steepen rapidly below 13-m depth in the core, suggesting little northward motion of this part of the Pacific plate until about 25 m.y. ago. Examination of the opaque minerals in polished section, as well as the Curie temperatures determined for six basalt samples, reveals no evidence of high- or intermediate-temperature oxidation and thus no reheating of the basement rock since its formation.

Formato

application/zip, 2 datasets

Identificador

https://doi.pangaea.de/10.1594/PANGAEA.802524

doi:10.1594/PANGAEA.802524

Idioma(s)

en

Publicador

PANGAEA

Direitos

CC-BY: Creative Commons Attribution 3.0 Unported

Access constraints: unrestricted

Fonte

Supplement to: Montgomery, Adair F; Johnson, H Paul (1987): Paleomagnetic studies of Leg 91 basalts and sediments. In: Menard, HW; Natland, J; Jordan, TH; Orcutt, JA; et al. (eds.), Initial Reports of the Deep Sea Drilling Project, Washington (U.S. Govt. Printing Office), 91, 475-482, doi:10.2973/dsdp.proc.91.114.1987

Palavras-Chave #at 5 mT; Comment; Curie temp; Curie temperature; Deep Sea Drilling Project; Depth; DEPTH, sediment/rock; DSDP; Event; Incl; Inclination; Inten (AF); Inten (NRM); Koenigsberger ratio; Label; MDF; Median demagnetizing field; NRM, Intensity; NRM, Intensity after demagnetization; ODP sample designation; Q-ratio; Sample code/label; stable, blanks indicate a rejected sample which no stable inclination could be determined,; stable inclination, negative direction indicates normal polarity in Southern Hemisphere coordinate system; Suscept; Susceptibility
Tipo

Dataset