| Composition and Assemblage Characteristics of Magnetic Minerals in Layer S_(5-1) of Xifeng and Duanjiapo Sections |
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| 作者姓名： | 贾蓉芬 彭先芝 周正 刘德汉 王冠鑫 王德强 |
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| 作者单位： | Guangzhou Institute of Geochemistry，Chinese Academy of Sciences，Guangzhou 510640，China，(State Key Lab. of Organic Geochemistry，Guangzhou Institute of Geochemistry，Chinese Academy of Sciences，Guangzhou 510640，Guangzhou Institute of Geochemistry，Chinese Academy of Sciences，Guangzhou 510640，China，(State Key Lab. of Organic Geochemistry，Guangzhou Institute of Geochemistry，Chinese Academy of Sciences，Guangzhou 510640，Guangzhou Institute of Geochemistry，Chinese Academy of Sciences，Guangzhou 510640，China，Guangzhou Institute of Geochemistry，Chinese Academy of Sciences，Guangzhou 510640，China，Guangzhou Institute of Geochemistry，Chinese Academy of Sciences，Guangzhou 510640，China，Guangzhou Institute of Geochemistry，Chinese Academy of Sciences，Guangzhou 510640，China |
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| 基金项目： | 国家自然科学基金，Guangzhou Institute of Geochemistry |
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| 摘 要： | Magneticmineralsintheloess paleosolseriesaccountforabout 1 % -2 %ofthetotal (LiuTungshengandZhangZhonghu ,1 962 ) .Duetotheiraerolianorigin ,themagneticmineralsarecomplicatedincomposition ,largeingrainsizerange ,andsignificantlydifferentincrystallinity .Asaresult,researchonthesemagneticmineralswouldbesetwithalotofdifficulties.Previousre searchersemployedopticalmicroscopic ,X raydiffractionandM ssbauerspectrometrictechniquestostudythemagneticmineralsintheloess paleosolseries,andchieflyontheb…
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| 关 键 词： | magnetic mineral (< 30μm) |
Composition and Assemblage Characteristics of Magnetic Minerals in Layer S5-1 of Xifeng and Duanjiapo Sections |
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| JIA Rongfen {,},PENG Xianzhi {,},ZHOU Zheng {},LIU Dehan {},WANG Guanxin {},and WANG Deqiang {}.Composition and Assemblage Characteristics of Magnetic Minerals in Layer S_(5-1) of Xifeng and Duanjiapo Sections[J].Chinese Journal of Geochemistry,2004,23(3). |
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| Authors: | JIA Rongfen { } PENG Xianzhi { } ZHOU Zheng {} LIU Dehan {} WANG Guanxin {} and WANG Deqiang {} |
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| Institution: | JIA Rongfen +{1,2)},PENG Xianzhi +{1,2)},ZHOU Zheng +{1)},LIU Dehan +{1)},WANG Guanxin +{1)},and WANG Deqiang +{1)}1) |
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| Abstract: | Relatively strongly magnetic fine components (<30μm, XS-4J and DS-4J) which are most environmentally sensitive were separated from layer S5-1 in the Xifeng and Duanjiapo loess sections and analyzed by MPV-3 for their morphometric characteristics and reflectance, SEM-ESD for their element contents and XRD for their mineral phases, respectively. The results showed that minerals in both samples are dominated by detrial Fe-Ti oxides of aeolian origin. In sample XS-4J the reflectance and iron contents of magnetic minerals are usually high. In addition to magnetite (Fe3O4), maghemite (γFe2O3) and hematite (Fe2O3), some Fe-high oxide (72.25 wt%-86.67 wt%), ilmenite (FeTiO3), and magnetite-ulvspinel Fe(FeCr)O4, Fe(FeNi)O4] were also detected. In sample DS-4J obvious negative linear correlations were found between Ti and Fe, and the contents of Mn, Si, Al and Ca are usually high and the minerals are dominated by magnetite (maghemite), goethite (FeOOH) and limonite (containing Si and OH). In addition, the signs of corrosion of magnetic minerals and newly crystallized magnetite (maghemite) were recognized. Differences in the composition and assemblage characteristics of magnetite minerals between XS and DS reflect significant differences in source rocks and preserving conditions. |
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| Keywords: | paleosol layer S5-1 Xifeng and Duanjiapo sections Fe-Ti oxide series redox environment |
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