Paleomagnetic excursions recorded in the Yanchi Playa in middle hexi corridor, NW China since the last interglacial
Yang Taibao; Yu Yongtao; Li Jijun; An Congrong; Liu Jinfeng; Zhang Junyan
Corresponding AuthorYang TB
2004-08
Source PublicationJOURNAL OF MOUNTAIN SCIENCE
ISSN1672-6318
Volume1Issue:2Pages:128–142
AbstractPaleomagnetic determinations on lithological profiles of two paralleled long drilling cores covering the past 130 kyr B.P., GT40 and GT60, from the Yanchi Playa in the arid Northwestern China, indicate that a series of pronounced paleomagnetic excursions have been documented. By correlating our results with published regional and worldwide reports, 4 excursion events out of 10 apparent reversal signals (labeled from GT-1 to GT-10) were identified as excursion events coeval with the Mono Lake Event (28.4 kyr–25.8 kyr), Laschamp Event (43.3 kyr–40.5 kyr), Gaotai Event (82.8 kyr–72.4 kyr) and the Blake Event (127.4 kyr–113.3 kyr), respectively. GT-9 correlates with the above-mentioned Gaotai Event, GT-7 and GT-6 correspond to two stages of the Laschamp Event and GT-5 to the Mono Lake Event. It is noteworthy that the so-called Gaotai Event has not been reported as a pronounced paleomagnetic excursion in the Northwestern China. Every magnetic excursion event corresponds to paleointensity minima, anteceding those established abrupt paleoclimatic change events, such as the Younger Drays and the Heinrich Events (H1–H6). Here, we tentatively propose that these geomagnetic excursions/reversals can be viewed as precursors to climate abruptness. During the transitional stages when the earth’s magnetic field shifted between a temporal normal and a negative period, the earth’s magnetic paleointensity fell correspondingly to a pair of minima. Although more precise chronology and more convincing rock magnetic parameter determinations are essentially required for further interpretation of their intricate coupling mechanism, these results may have revealed, to some extent, that the earth’s incessantly changing magnetic field exerts an strong influence on the onset of saw-tooth shaped abrupt climate oscillations through certain feedback chains in arid Central Asia or even North Hemispheric high latitude regions.
KeywordPaleomagnetism Geomagnetic Excursion The Late Pleistocene Arid Northwestern China
Language英语
Document Type期刊论文
Identifierhttp://ir.imde.ac.cn/handle/131551/6174
CollectionJournal of Mountain Science_Journal of Mountain Science-2006_Vol3 No.2_Journal of Mountain Science-2004_Vol1 No.2
Recommended Citation
GB/T 7714
Yang Taibao,Yu Yongtao,Li Jijun,et al. Paleomagnetic excursions recorded in the Yanchi Playa in middle hexi corridor, NW China since the last interglacial[J]. JOURNAL OF MOUNTAIN SCIENCE,2004,1(2):128–142.
APA Yang Taibao,Yu Yongtao,Li Jijun,An Congrong,Liu Jinfeng,&Zhang Junyan.(2004).Paleomagnetic excursions recorded in the Yanchi Playa in middle hexi corridor, NW China since the last interglacial.JOURNAL OF MOUNTAIN SCIENCE,1(2),128–142.
MLA Yang Taibao,et al."Paleomagnetic excursions recorded in the Yanchi Playa in middle hexi corridor, NW China since the last interglacial".JOURNAL OF MOUNTAIN SCIENCE 1.2(2004):128–142.
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