https://scholars.lib.ntu.edu.tw/handle/123456789/385083
標題: | Dominant dipole effect embedded in paleomagnetic secular variation in Taiwan region over the past 7500years | 作者: | KUO-YEN WEI | 關鍵字: | Dipole moment; Secular variation; Taiwan | 公開日期: | 2014 | 卷: | 234 | 起(迄)頁: | 14-22 | 來源出版物: | Physics of the Earth and Planetary Interiors | 摘要: | To study the Holocene paleomagnetic field in Taiwan area, we performed a series of magnetic experiments to a marine sediment core OR1-715-21 obtained from the offshore of eastern Taiwan during the OR1-715 cruise. Analyzed magnetic properties show that the remanent magnetization carriers of the core are uniformly dominated by single-domain and pseudo-single-domain magnetite, revealing a suitable material for relative paleointensity (RPI) estimation. The stable and well defined characteristic remanent magnetization (ChRM) provides the reliable determination of the inclination and declination. Dipole moments were further calculated by using the RPI and inclination data. The variation of the dipole moments compares well to the CALS10k.1b model (a continuous model of archaeomagnetic and lake sediment data for the past 10000. years), implying the dominance of the dipole field in Taiwan area. Though the real declination is unavailable because of lacking core orientation during coring, we could correct the values based on some critical conditions. If the paleosecular variation (PSV) is considered, the virtual geomagnetic pole (VGP) is generally suggested to vary between 80°N and 90°N instead of coinciding with the geography North Pole. To fit the condition considering the PSV effect, the ChRM declination had to be rotated 180° to get the corrected declination. As a result, variation patterns of the paleo-inclination, -declination, and paleointensity could be suitably determined in the study. Outcomes of these analyses reveal that the paleomagnetic field in Taiwan region should be dominantly driven from the dipole field under the PSV effect for the last 7500. years. © 2014 Elsevier B.V. |
URI: | http://www.scopus.com/inward/record.url?eid=2-s2.0-84903879099&partnerID=MN8TOARS http://scholars.lib.ntu.edu.tw/handle/123456789/385083 |
DOI: | 10.1016/j.pepi.2014.06.011 | SDG/關鍵字: | Geomagnetism; Submarine geology; Paleomagnetic field; Paleomagnetic secular variations; Paleosecular variations; Pseudo single domains; Relative paleointensity; Remanent magnetization; Secular variation; Taiwan; Dipole moment; Holocene; magnetic field; magnetite; paleomagnetism; remanent magnetization; secular variation; sediment core; Taiwan |
顯示於: | 地質科學系 |
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