重庆羊子洞MIS5a/MIS4转换时期石笋微量元素记录及其气候意义  

Stalagmite Trace Element and Its Implications from Yangzi Cave during 76~69 ka B.P.

作　　者：李辰丝[1] 杨勋林[1,2] 黄帆[1] 李国军[1] 吕春艳[1] 杨琰[1,2] 

机构地区：[1]西南大学地理科学学院,重庆400715 [2]三峡库区生态环境教育部重点实验室,重庆400715

出　　处：《沉积学报》2015年第2期299-305,共7页Acta Sedimentologica Sinica

基　　金：国家自然科学基金项目(批准号:41072141;41272192);中央高校基本科研业务费重大项目(编号:XDJK2012A003)联合资助

摘　　要：利用重庆丰都羊子洞石笋Y02 ICP-MS测年数据、微量元素数据和石笋氧同位素数据重建了三峡库区76~69ka B.P.时段的古气候环境信息。将石笋Y02测试数据与太阳辐射曲线、格陵兰NGRIP冰芯和南海海表温度进行对比分析,结果显示石笋Mg/Ca主要响应降水变化,而Sr/Ca、Ba/Ca和U/Ca更多地响应地表土壤状况和当地大气粉尘活动,间接响应降水变化;石笋Y02δ18O记录出现偏重的趋势比微量元素比值增大时间晚1 ka多,表明石笋微量元素比值可能还受到温度影响。Using Chongqing Fengdu Yangzi Cave Stalagmite Y02 ICP-MS dating data,trace element data and stalagmite oxygen isotope data reconstruct the paleoclimate and paleoenvironment of Chongqing area during 76 ~ 69 ka BP periods.We have contrasted the stalagmite Y02 test data with the curve of local solar radiation,the Greenland NGRIP ice core,the surface temperature of south sea,and results show that:Mg / Ca in stalagmite response to changes in precipitation mainly,while Sr / Ca,Ba / Ca and U / Ca response to surface soil conditions and local atmospheric dust activities,and thus in response to changes in precipitation indirectly;oxygen isotope and trace elements not synchronous changes appeared in stalagmite Y02,stalagmite δ18O heavy trend appeared 1ka later than the trace element ratios increased,shows that the changes of trace element ratios also affected by temperature in stalagmite.

关 键 词：石笋 微量元素 羊子洞 三峡库区 

分 类 号：P532[天文地球—古生物学与地层学]