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Tauxe, L. and Love, J.J. (2003). Paleointensity in Hawaiian Scientific Drilling Project Hole (HSDP2): Results from submarine basaltic glass. Geochemistry Geophysics Geosystems 4: doi: 10.1029/2001GC000276. issn: 1525-2027. |
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[1] Paleointensity estimates based on the high quality Thellier-Thellier data from the early Brunhes (420-780 ka) are rare (only 30 in the published literature). The Second Hawaiian Scientific Drilling Project (HSDP2) drill hole recovered submarine volcanics spanning the approximate time period of 420-550 ka. These are of particular interest for absolute paleointensity studies owing to the abundance of fresh submarine basaltic glass, which can preserve an excellent record of ancient geomagnetic field intensity. We present here new results of Thellier-Thellier paleointensity experiments that nearly double the number of reliable paleointensity data available for the early Brunhes. We also show that the magnetizations of the associated submarine basalts are dominated by viscous magnetizations and therefore do not reflect the true ancient geomagnetic field intensity at the time of extrusion. The viscous contamination is particularly severe because of a combination of low blocking temperatures in the basalts and relatively high temperatures in the deeper parts of the drill core. Our new data, when placed on the approximate timescale available for HSDP and HSDP2, are at odds with other contemporaneous paleointensity data. The discrepancy can be reconciled by adjusting the HSDP timescales to be younger by about 35 kyr. |
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Thellier-Thellier Experiment Data |
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Thellier-Thellier Flow Chart |
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Cross Section of HSDP2 |
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Keywords
Geomagnetism and Paleomagnetism, Paleointensity, Geomagnetism and Paleomagnetism, Time variations--secular and long term, Geomagnetism and Paleomagnetism, Instruments and techniques, Geomagnetism and Paleomagnetism, Rock and mineral magnetism |
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Journal
Geochemistry Geophysics Geosystems |
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Publisher
American Geophysical Union
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