dorsal/arxiv
View SchemaAbsolute palaeointensity of Oligocene (28-30 Ma) lava flows from the Kerguelen Archipelago (southern Indian Ocean)
| Authors | Guillaume Plenier, Pierre Camps, Robert S. Coe, Mireille Perrin |
|---|---|
| Categories | |
| ArXiv ID | physics/0304060 |
| URL | https://arxiv.org/abs/physics/0304060 |
| DOI | 10.1046/j.1365-246X.2003.02010.x |
| Journal | Geophysical Journal International 154 (2003) 877-890 |
Abstract
We report palaeointensity estimates obtained from three Oligocene volcanic sections from the Kerguelen Archipelago (Mont des Ruches, Mont des Tempetes, and Mont Rabouillere). Of 402 available samples, 102 were suitable for a palaeofield strength determination after a preliminary selection, among which 49 provide a reliable estimate. Application of strict a posteriori criteria make us confident about the quality of the 12 new mean-flow determinations, which are the first reliable data available for the Kerguelen Archipelago. The Virtual Dipole Moments (VDM) calculated for these flows vary from 2.78 to 9.47 10e22 Am2 with an arithmetic mean value of 6.15+-2.1 10e22 Am2. Compilation of these results with a selection of the 2002 updated IAGA palaeointensity database lead to a higher (5.4+-2.3 10e22 Am2) Oligocene mean VDM than previously reported, identical to the 5.5+-2.4 10e22 Am2 mean VDM obtained for the 0.3-5 Ma time window. However, these Kerguelen palaeointensity estimates represent half of the reliable Oligocene determinations and thus a bias toward higher values. Nonetheless, the new estimates reported here strengthen the conclusion that the recent geomagnetic field strength is anomalously high compared to that older than 0.3 Ma.
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"abstract": "We report palaeointensity estimates obtained from three Oligocene volcanic\nsections from the Kerguelen Archipelago (Mont des Ruches, Mont des Tempetes,\nand Mont Rabouillere). Of 402 available samples, 102 were suitable for a\npalaeofield strength determination after a preliminary selection, among which\n49 provide a reliable estimate. Application of strict a posteriori criteria\nmake us confident about the quality of the 12 new mean-flow determinations,\nwhich are the first reliable data available for the Kerguelen Archipelago. The\nVirtual Dipole Moments (VDM) calculated for these flows vary from 2.78 to 9.47\n10e22 Am2 with an arithmetic mean value of 6.15+-2.1 10e22 Am2. Compilation of\nthese results with a selection of the 2002 updated IAGA palaeointensity\ndatabase lead to a higher (5.4+-2.3 10e22 Am2) Oligocene mean VDM than\npreviously reported, identical to the 5.5+-2.4 10e22 Am2 mean VDM obtained for\nthe 0.3-5 Ma time window. However, these Kerguelen palaeointensity estimates\nrepresent half of the reliable Oligocene determinations and thus a bias toward\nhigher values. Nonetheless, the new estimates reported here strengthen the\nconclusion that the recent geomagnetic field strength is anomalously high\ncompared to that older than 0.3 Ma.",
"arxiv_id": "physics/0304060",
"authors": [
"Guillaume Plenier",
"Pierre Camps",
"Robert S. Coe",
"Mireille Perrin"
],
"categories": [
"physics.geo-ph"
],
"doi": "10.1046/j.1365-246X.2003.02010.x",
"journal_ref": "Geophysical Journal International 154 (2003) 877-890",
"title": "Absolute palaeointensity of Oligocene (28-30 Ma) lava flows from the Kerguelen Archipelago (southern Indian Ocean)",
"url": "https://arxiv.org/abs/physics/0304060"
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