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Helium isotope investigation on magnetic reversal boundaries of loess-paleosol sequence at luochuan, central chinese loess Plateau

引用

chinese Science Bulletin 2007年第17期52卷 2407-2412页

作者： du xueqing1,6, wang yonghong2. ren jianguo3, ye xianren4.& lu huayu5,1 1 state key laboratory of loess and quaternary geology, institute of earth environment, chinese academy of sciences, xi’an 710075, china 2 College of Marine Geosciences, Ocean University of china, Qingdao 266003, china 3 National Natural Science Foundation of china, Beijing 100085, china 4 Lanzhou Research Center for Petroleum and Natural Gas Resources, institute of geology and Geophysics, chinese academy of sciences, Lanzhou 730000, china 5 key laboratory of Coast and Island Development, School of Geographic and Oceanographic sciences, Nanjing University, Nanjing 210093, china 6 Graduate University of chinese academy of sciences, Beijing 100049, china state key laboratory of loess and quaternary geology Institute of Earth Environment Chinese Academy of Sciences Xi’an China Graduate University of chinese academy of sciences Beijing China College of Marine Geosciences Ocean University of China Qingdao China National Natural Science Foundation of china Beijing China Lanzhou Research Center for Petroleum and Natural Gas Resources Institute of Geology and Geophysics Chinese Academy of Sciences Lanzhou China key laboratory of Coast and Island Development School of Geographic and Oceanographic Sciences Nanjing University Nanjing China

Extraterrestrial particles have higher 3He/4He ratios than those of terrestrial sediments ( > 100 Ra versus < 0.03 Ra, where Ra is the 3He/4He ratio normalized to the atmospheric value of 1.4×10?6). The inter- planet... 详细信息

Extraterrestrial particles have higher 3He/4He ratios than those of terrestrial sediments ( > 100 Ra versus 4He ratio normalized to the atmospheric value of 1.4×10?6). The inter- planetary dust particles (IDPs), which are very rich in 3He, continuously bombard the earth and can accumulate in deposits. IDPs sedimentation rate changes can significantly influence 3He concentration in the earth surface sediments. Since IDPs are not easy to detect in terrestrial deposits, measuring helium isotopes is a helpful approach to examine changes in IDPs. Helium concentration and helium isotopic composition magnetic substances and the quartz particles were examined for helium concen- tration and helium isotopic ratio. Results show that the 3He/4He ratio and the 3He concentrations of the magnetic substances are clearly higher than those of the bulk samples and the quartz particles, and, the 3He/4He ratio of the extracted magnetic substances is also higher than that of the average level of the earth’s crust. The higher helium content in the magnetic fractions can be explained by an influx of IDPs.

关键词：中国黄土高原古土壤氦同位素行星际尘埃颗粒反方向磁化

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