| 临夏盆地晚中新世沉积物中赤铁矿和针铁矿的含量特征及其意义 |
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| 引用本文： | 闫晓丽,杨一博,方小敏,苗运法,宋春晖. 临夏盆地晚中新世沉积物中赤铁矿和针铁矿的含量特征及其意义[J]. 兰州大学学报(自然科学版), 2012, 0(1): 55-61 |
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| 作者姓名： | 闫晓丽 杨一博 方小敏 苗运法 宋春晖 |
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| 作者单位： | 兰州大学西部环境教育部重点实验室;中国科学院青藏高原研究所大陆碰撞与高原隆升重点实验室;中国科学院寒区旱区环境与工程研究所沙漠与沙漠化重点实验室 |
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| 基金项目： | 国家自然科学基金委创新研究群体科学基金项目(41021001);重大国际合作基金项目(40920114001) |
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| 摘 要： | 利用对铁氧化物矿物灵敏的漫反射光谱法,对临夏盆地的黑林顶剖面(古地磁年代为11.8～5.0Ma)赤铁矿和针铁矿含量进行测定.结果表明:赤铁矿含量在8.6 Ma以前相对较高,在8.6 Ma以后骤然降低并稳定在一低值范围;针铁矿则没有明显的变化趋势,赤铁矿/针铁矿的变化则与赤铁矿的变化趋势一致;赤铁矿、针铁矿含量及其比值在该剖面的变化特征主要反映了8.6 Ma以来亚洲内陆干旱化的加剧,可能与青藏高原在该时期的剧烈隆升密切相关.
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| 关 键 词： | 赤铁矿 针铁矿 晚中新世 气候变化 临夏盆地 青藏高原 |
Characteristics and implications of hematite and goethite concentration in sediments of the late miocene,Linxia Basin |
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| YAN Xiao-li,YANG Yi-bo,FANG Xiao-min,MIAO Yun-fa,SONG Chun-hui. Characteristics and implications of hematite and goethite concentration in sediments of the late miocene,Linxia Basin[J]. Journal of Lanzhou University(Natural Science), 2012, 0(1): 55-61 |
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| Authors: | YAN Xiao-li YANG Yi-bo FANG Xiao-min MIAO Yun-fa SONG Chun-hui |
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| Affiliation: | 1,2) 1.Key Laboratory of Western China’s Environmental Systems with the Ministry of Education, Lanzhou University,Lanzhou 730000,China 2.Key Laboratory of Continental Collision and Plateau Uplift,Institute of Tibetan Plateau Research, Chinese Academy of Sciences,Beijing 100085,China 3.Key Laboratory of Desert and Desertification,Cold and Arid Regions Environmental and Engineering Institute,Chinese Academy of Sciences,Lanzhou 730000,China |
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| Abstract: | The miocene sediments in the Linxia basin are important for understanding the Qinghai-Tibetan plateau uplift and the east Asian monsoon developments.Hematite and goethite from the Heilinding section in the southern margin of the Linxia basin(11.8～5.0 Ma) were tested.The content of the hematite was high in 11.88.6 Ma,decreasing obviously at 8.6 Ma and kept stable in 8.6～5.0 Ma,whereas goethite was almost stable throughout the period.The trend of hematite/goethite ration was similar to hematite content.Such hematite, goethite and hematite/goethite contents in the Heilinding section probably indicate a strong aridification process since 8.6 Ma in central Asia,which was linked to the Qinghai-Tibetan plateau uplift during this time. |
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| Keywords: | hematite goethite miocene climate change Linxia basin Qinghai-Tibetan plateau |
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