CAVE SEDIMENTS AND PALEOCLIMATE
CAVE SEDIMENTS AND PALEOCLIMATE
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发表时间：
2007
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通讯作者：
W. White
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作者：
W. White
本文综述了洞穴沉积物的特征及其作为古气候档案的应用。洞穴沉积物可分为两大类，碎屑沉积物和化学沉积物。其中，河流搬运的碎屑沉积物和方解石洞穴沉积物是最常见的，也是最有用的气候记录。洞穴沉积物定年技术包括洞穴沉积物的放射性碳和U/Th定年、碎屑沉积物的古地磁倒转和宇宙成因同位素定年。宇宙成因同位素测年技术对多层次洞穴和不同海拔洞穴中碎屑沉积物进行了测年，提供了5 Ma以来洞穴年龄和河流系统演化的地貌记录。洞穴沉积物（主要是石笋）的同位素剖面、微量元素剖面、色带和发光剖面提供了数十万年来非常高时间分辨率的详细古气候记录。这些方法有可能应用于晚全新世气候，对评估目前对全球变暖的关注有影响。
This paper is a review of cave sediments: their characteristics and their application as paleoclimate archives. Cave sediments can be separated into two broad categories, clastic sediments and chemical sediments. Of these, stream-transported clastic sediments and calcite speleothems are both the most common and also the most useful as climatic records. Techniques for dating cave sediments include radiocarbon and U/Th dating of speleothems and paleomagnetic reversals and cosmogenic isotope dating of clastic sediments. Cosmogenic isotope dating of clastic sediments in caves with multiple levels or which occur at different elevations provide a geomorphic record of cave ages and river system evolution over the past 5 Ma. Isotope profiles, trace element profiles, color banding and luminescence profiles of speleothems, mainly stalagmites, produce a detailed paleoclimate record with very high time resolution over the past several hundred thousand years. There is potential application of these methods to late Holocene climates with implications for evaluation of current concern over global warming.