Arid
DOI10.1016/0012-821X(94)90062-0
A ROCK-MAGNETIC RECORD FROM LAKE BAIKAL, SIBERIA - EVIDENCE FOR LATE QUATERNARY CLIMATE-CHANGE
PECK, JA; KING, JW; COLMAN, SM; KRAVCHINSKY, VA
通讯作者PECK, JA
来源期刊EARTH AND PLANETARY SCIENCE LETTERS
ISSN0012-821X
出版年1994
卷号122期号:1-2页码:221-238
英文摘要

Rock-magnetic measurements of sediment cores from the Academician Ridge region of Lake Baikal, Siberia show variations related to Late Quaternary climate change. Based upon the well-dated last glacial-interglacial transition, variations in magnetic concentration and mineralogy are related to glacial-interglacial cycles using a conceptual model. Interglacial intervals are characterized by low magnetic concentrations and a composition that is dominated by low coercivity minerals. Glacial intervals are characterized by high magnetic concentrations and increased amounts of high coercivity minerals. The variation in magnetic concentration is consistent with dilution by diatom opal during the more productive interglacial periods. We also infer an increased contribution of eolian sediment during the colder, windier, and more arid glacial conditions when extensive loess deposits were formed throughout Europe and Asia. Eolian transport is inferred to deliver increased amounts of high coercivity minerals as staining on eolian grains during the glacial intervals. Variations in magnetic concentration and mineralogy of Lake Baikal sediment correlate to the SPECMAP marine oxygen-isotope record. The high degree of correlation between Baikal magnetic concentration/mineralogy and the SPECMAP oxygen-isotope record indicates that Lake Baikal sediment preserves a history of climate change in central Asia for the last 250 ka. This correlation provides a method of estimating the age of sediment beyond the range of the radiocarbon method. Future work must include providing better age control and additional climate proxy data, thereby strengthening the correlation of continental and marine climate records.


类型Article
语种英语
国家RUSSIA ; USA
收录类别SCI-E
WOS记录号WOS:A1994NE75700016
WOS关键词RIFT-ZONE ; SUSCEPTIBILITY ; SEDIMENTS ; CYCLES
WOS类目Geochemistry & Geophysics
WOS研究方向Geochemistry & Geophysics
来源机构United States Geological Survey
资源类型期刊论文
条目标识符http://119.78.100.177/qdio/handle/2XILL650/129906
作者单位(1)E SIBERIAN GEOL GEOPHYS & MINERAL RESOURCES RES INST,IRKUTSK 664026,RUSSIA;(2)US GEOL SURVEY,WOODS HOLE,MA 02543
推荐引用方式
GB/T 7714
PECK, JA,KING, JW,COLMAN, SM,et al. A ROCK-MAGNETIC RECORD FROM LAKE BAIKAL, SIBERIA - EVIDENCE FOR LATE QUATERNARY CLIMATE-CHANGE[J]. United States Geological Survey,1994,122(1-2):221-238.
APA PECK, JA,KING, JW,COLMAN, SM,&KRAVCHINSKY, VA.(1994).A ROCK-MAGNETIC RECORD FROM LAKE BAIKAL, SIBERIA - EVIDENCE FOR LATE QUATERNARY CLIMATE-CHANGE.EARTH AND PLANETARY SCIENCE LETTERS,122(1-2),221-238.
MLA PECK, JA,et al."A ROCK-MAGNETIC RECORD FROM LAKE BAIKAL, SIBERIA - EVIDENCE FOR LATE QUATERNARY CLIMATE-CHANGE".EARTH AND PLANETARY SCIENCE LETTERS 122.1-2(1994):221-238.
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