Holocene palaeomagnetic secular variation at Lake Biwa, central Japan

被引:58
作者
Ali, M
Oda, H
Hayashida, A
Takemura, K
Torii, M
机构
[1] Kyoto Univ, Grad Sch Sci, Div Earth & Planetary Sci, Kyoto 6068224, Japan
[2] Geol Survey Japan, Dept Marine Geol, Tsukuba, Ibaraki 3050046, Japan
[3] Doshisha Univ, Sci & Engn Res Inst, Kyoto 6100321, Japan
关键词
Holocene; Japan; Lake Biwa; piston cores; PSV correlation; secular variation;
D O I
10.1046/j.1365-246X.1999.00718.x
中图分类号
P3 [地球物理学]; P59 [地球化学];
学科分类号
0708 ; 070902 ;
摘要
We have conducted a palaeomagnetic study on three sediment cores obtained from a single site in Lake Biwa, central Japan. A total of 1430 discrete samples from three cores show strong and stable remanence, which is carried by pseudo-single-domain magnetite. Palaeomagnetic records from individual cores show little scatter of directions, and there is excellent correlation among the records from the site. A composite palaeomagnetic secular variation (PSV) record for the Holocene was constructed after fine-scale adjustment and stacking of the three records. The age model is based on two wide-spread tephra layers: Kawagodaira (3150 yr BP, calendar years) and Kikai-Akahoya (7250 yr BP). Our results show that the declinations and inclinations are strikingly similar to archaeomagnetic data from southwest Japan for the last 2000 years. The PSV record from Lake Biwa shows good correlation in directions with that of Beppu Bay, located about 500 km west of Lake Biwa, although the Beppu Bay record shows relatively smaller amplitudes of both inclination and declination, probably due to heavy smoothing of the initial results. When the Lake Biwa record is compared with the proposed type curve for southwest Japan, there is considerable disagreement throughout the Holocene. A re-analysis of the data sets and other information used to construct the type curve revealed that the discrepancy in the results was due to inadequate age determination for the cores used in previous studies. We conclude that the stacked PSV record from Lake Biwa meets the criteria required for a reliable curve. Moreover, our results resolve the complications found in the correlation of PSV records in southwest Japan and thereby contribute to a better understanding of Holocene PSV.
引用
收藏
页码:218 / 228
页数:11
相关论文
共 35 条
[1]  
[Anonymous], 1988, GEOLOGICAL SOC AM SP, DOI DOI 10.1130/SPE227-P123
[2]   OBJECTIVE METHOD FOR SMOOTHING PALEOMAGNETIC DATA [J].
CLARK, RM ;
THOMPSON, R .
GEOPHYSICAL JOURNAL OF THE ROYAL ASTRONOMICAL SOCIETY, 1978, 52 (02) :205-213
[3]   HYSTERESIS PROPERTIES OF TITANOMAGNETITES - GRAIN-SIZE AND COMPOSITIONAL DEPENDENCE [J].
DAY, R ;
FULLER, M ;
SCHMIDT, VA .
PHYSICS OF THE EARTH AND PLANETARY INTERIORS, 1977, 13 (04) :260-267
[4]   DISPERSION ON A SPHERE [J].
FISHER, R .
PROCEEDINGS OF THE ROYAL SOCIETY OF LONDON SERIES A-MATHEMATICAL AND PHYSICAL SCIENCES, 1953, 217 (1130) :295-305
[5]  
HEDGES REM, 1983, GEOMAGNETISM BAKED C, P37
[6]  
HIROOKA K, 1983, GEOMAGNETISM BAKED C, P150
[7]  
Holloway J. L., 1958, ADV GEOPHYS, V4, P351, DOI [DOI 10.1016/S0065-2687(08)60487-2, 10.1016/S0065-2687(08)60487-2]
[8]  
HORIE S, 1980, ARCH HYDROBIOL, V89, P45
[9]   GEOMAGNETIC SECULAR VARIATION RECORDED IN REMANENT MAGNETIZATION OF SILTY SEDIMENTS FROM THE INLAND SEA, JAPAN (SETO-NAIKAI) [J].
HYODO, M ;
YASKAWA, K .
JOURNAL OF GEOMAGNETISM AND GEOELECTRICITY, 1986, 38 (01) :11-26
[10]   PALEOMAGNETISM OF A CORE FROM OSAKA BAY [J].
HYODO, M ;
MORINAGA, H ;
NISHIMURA, H ;
INOKUCHI, H ;
YASKAWA, K .
JOURNAL OF GEOMAGNETISM AND GEOELECTRICITY, 1985, 37 (07) :729-737