重庆地区江北砾岩北碚附中剖面磁化率特征及其环境意义  

MAGNETIC SYSCEPTIBILITY CHARACTERISTICS OF JIANGBEI CONGLOMERATE IN CHONGQING AREA AND THEIR ENVIRONMENTAL SIGNIFICANCE

作　　者：熊平生[1] 谢世友[1] 何多兴[1] 莫心祥[1] 

机构地区：[1]西南师范大学资源与环境科学院

出　　处：《物探与化探》2006年第2期115-118,共4页Geophysical and Geochemical Exploration

基　　金：重庆市科委研究项目(2002-7534;2004-8258)资助

摘　　要：选取砾岩层填穴物、砾石层局部胶结填穴物、砂岩层新鲜岩石作为分析样品,运用了磁化率值1、4C测年、磁铁矿含量、氧同位素分析等方法进行测定和研究。结果表明,江北砾岩北碚附中剖面,磁化率值的变化与磁性铁矿含量有较好的一致性,磁化率曲线与氧同位素曲线变化特征具有较好的对应性。江北砾岩北碚附中剖面岩层的磁化率能指示晚更新世晚期的环境变化,包含了2个较短的暖湿期和3个较长的冷干时期,而干冷时期内又存在很短暖湿期。The materials filled in the cave of conglomerate, part of cemented materials of sandstone and fresh rocks of sandstone were analyzed by magnetic susceptibility values, carbon 14, magnetic iron mineral content and ^18O isotope. It is concluded that the magnetic susceptibility values of the Jiangbei conglomerate in Fuzhong of Beibei are consistent with the content of magnetic iron mineral. The characteristics of the magnetic susceptibility curve are similar to those of the oxygen isotope curve. The magnetic susceptibility of Jiangbei conglomerate in Fuzhong of Beibei can indicate the ancient climate change ： the last stage of last pleistocene epoch experienced two relatively short warm-humid periods and three comparatively long dry-cool periods, but in the dry-cool periods there exists very short warm-humid time.

关 键 词：砾岩 磁化率 氧同位素 古环境 

分 类 号：P631.2[天文地球—地质矿产勘探]