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中文摘要：
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8.6Ma以前相对较高，在8.6Ma以后骤然降低并稳定在-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8.6Ma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。
英文摘要：
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 11.8-8.6 Ma, decreasing obviously at 8.6 Ma and kept stable in 8.6-5.0 Ma, whereas goethite was almost stable throughout the periad. 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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