REMANENCE MAGNETIC RECORDS FROM RECENT 130 000 YEARS IN SEDIMENTS OF NANSHA AREA, SOUTH CHINA SEA

YANG Xiao-qiang; ZHOU Wen-juan; GAO Fang-lei; LI Hua-mei

2006 Vol. 26, No. 1

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YANG Xiao-qiang, ZHOU Wen-juan, GAO Fang-lei, LI Hua-mei. REMANENCE MAGNETIC RECORDS FROM RECENT 130 000 YEARS IN SEDIMENTS OF NANSHA AREA, SOUTH CHINA SEA[J]. Marine Geology & Quaternary Geology, 2006, 26(1): 59-66.

Citation:

YANG Xiao-qiang, ZHOU Wen-juan, GAO Fang-lei, LI Hua-mei. REMANENCE MAGNETIC RECORDS FROM RECENT 130 000 YEARS IN SEDIMENTS OF NANSHA AREA, SOUTH CHINA SEA[J]. Marine Geology & Quaternary Geology, 2006, 26(1): 59-66.

REMANENCE MAGNETIC RECORDS FROM RECENT 130 000 YEARS IN SEDIMENTS OF NANSHA AREA, SOUTH CHINA SEA

1 Department of Earth Sciences, Zhongshan University, Guangzhou 510275, China;
2 Guangzhou Institude of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China

Received Date: 11 July 2005

Revised Date: 08 October 2005

Abstract

Abstract

281 samples, collected from the NS93-5 drilling core located in the Nansha area of South China Sea, were used to study magnetic characteristics of sediments in the Sea. Detailed rock magnetic results show that the magnetic minerals of sediments were dominated by ferrimagnetic minerals such as magnetite, but the small contribution of hematite and maghematite also existed. The sediments recorded three negative values of inclination in 191~206, 232~248 and 292~308 cm. The corresponding age of these negative values are 65.87~68.7, 73.4~80.8 and 108.4~113.6 kaBP according to stratigraphy of oxygen isotope, 14C and the age of volcano. The negative value during 108.4~113.6 kaBP may be the record of Blake event in the sediments of Nansha area.
- magnetic minerals /
- remanence magnetic inclination /
- Blake event /

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References

[1]	Cox A, Dell R R, Dalrymple G B. Geomagnetic ploarity epochs and Pleistocene geochronometry[J]. Nature, 1963, 198, 1049-1051. Google Scholar
[2]	Tauxe L. Sedimentary records of relative paleointensity of the geomagnetic field:theory and practice[J]. Review of Geophysics, 1993, 31:319-354. Google Scholar
[3]	Schellenberger A, Hellerb F, Veit H. Magnetostratigraphy and magnetic susceptibility of the Las Carreras loess paleosol sequence in Valle de Tafi, Tucuman, NW-Argentina[J]. Quaternary International, 2003, 106/107:159-167. Google Scholar
[4]	Heller F, Liu T S. Magnetostratigraphical dating of loess deposits in China[J]. Nature, 1982, 300:431-432. Google Scholar
[5]	Evans M E, Rokosh C D. The last interglacial in the Chinese Loess Plateau:a petromagnetic investigation of samples from a north-south transect[J]. Quaternary International, 2000,68/71:77-82. Google Scholar
[6]	Zhu R X, Zhou L P, Laj C, et al. The Blake geomagnetic polarity episode recorded in Chinese loess[J]. Geophys. Res. Lett., 1994, 21:697-700. Google Scholar
[7]	朱日祥,朱湘元,丁仲礼,等. 150 ka以来地球磁场长期变化与环境响应[J]. 中国科学B辑,1995,25(6):639-646. Google Scholar [ZHU Ri-xiang, ZHU Xiang-yuan, DING Zhong-li, et al. Paleomagnetic secular variation and its influences on environment through the last 150000 a[J]. Sci. China(Series B), 1996, 39(1):26-34.] Google Scholar
[8]	Wang L, Sarnthein M, Erlenkeuser H, et al. East Asian monsoon climate during the Late Pleistocene:high-resolution sediment records from the South China Sea[J]. Marine Geology, 1999, 156:245-284. Google Scholar
[9]	汪品先,赵泉鸿,成鑫荣,等. 十五万年来的南海[M]. 上海:同济大学出版社,1995.[WANG Pin-xian, ZHAO Quan-hong, CHENG Xin-rong,et al. South China Sea Since 150000 Years[M]. Shanghai:Publishing House of Tongji University,1995.] Google Scholar
[10]	陈木宏,涂霞,郑范,等. 南海南部近20万年沉积序列与古气候变化关系[J]. 科学通报,2000,45(5):542-548. Google Scholar [CHEN Mu-hong, TU Xia, ZHENF Fan, et al.Relations between sedimentary sequence and paleoclimatic changes during last 200 ka in the southern South China Sea[J]. Chinese Science Bulletin, 2000,45(14):1334-1340.] Google Scholar
[11]	Collinson D W. Methods in Rock Magnetism and Palaeomagnetism:Techniques and Instrumentation[M]. London:New York CHAPMAN AND HALL,1983. Google Scholar
[12]	Lowrie. Identification of ferromagnetic minerals in a rock by coercivity and unblocking temperature properties[J]. Geophys. Res. Lett., 1990, 17:159-162. Google Scholar
[13]	David J D, Qzden Q. Rock Magnetism:Fundamentals and frontiers[M]. Cambridge University Press, 1997. Google Scholar
[14]	Smith J D, Foster J H. Geomagnetic reversal in Brunhes normal polarity epoch[J]. Science, 1969, 163:565-567. Google Scholar
[15]	Dcnham C R. Blake polarity episode in two cores from the Greater Antilles Out ridge[J]. Earth and Planetary Science Letters, 1976, 29:422-434. Google Scholar
[16]	Creer K M, Readman P E, Jacods A M. Paleomagnetic and Paleontological dating of a section at Gioia Tauro. Italy:Identification of the Blake event[J]. Earth and Planetary Science Letters, 1980, 50:289-300. Google Scholar
[17]	ZHENG Hong-bo, Tim Rolph, John Shaw, et al. A detailed paleomagnetic record for the last interglacial period[J]. Earth and Planetary Science Letters, 1995, 133:339-351. Google Scholar
[18]	FANG Xiao-Min, LI Ji-Jun, Rob Van der Voo. A record of the Blake event during the last interglacial paleosol in the western Loess Plateau of China[J]. Earth and Planetary Science Letters, 1997, 146:73-82. Google Scholar
[19]	Asmae Rais, Carlo Laj, Jerome Surmont, et al. Geomagnetic field intensity between 70000 and 130000 years BP from a volcanic sequence on La Reunion, Indian Ocean[J]. Earth and Planetary Science Letters, 1996, 140:173-189. Google Scholar
[20]	Blei U, Gard G. Chronology and correlation of Quaternary magnetostratigraphy and nannofossil biostratigraphy in Norwegian-Greenland Sea sediments[J]. Geol. Rundsch., 1989, 78:1173-1187. Google Scholar
[21]	Nowaczyk N R, Frederichs T W, Eisenhauer A, et al. Magnetostratigraphic data from late Quaternary sediments from the Yermak Plateau, Arctic Ocean:evidence for four geomagnetic polarity events within the last 170 ka of the Brunhes Chron[J]. Geophys. J. Int., 1994, 117:453-471. Google Scholar
[22]	Merrill R T, McFadden P L. Geomagnetic field stability:Reversal events and excursions[J]. Earth Planet. Sci. Lett., 1994, 121:57-69. Google Scholar