中国庐山晚第四纪沉积地层同位素的环境示踪及表层过程  

Isotope as Environment Traces and Surface Layer Process in the Late Quaternary Deposited Strata of the Lushan Area of China

作　　者：胡东生[1,2,3,4] 李小豫[2] 胡蓉 熊卫强[6] 胡文瑄[7] 田新红[4] 刘卫国[3] 张国伟[4] 

机构地区：[1]湖南师范大学资源环境科学学院,长沙410081 [2]中国煤炭地质总局青海煤炭地质勘查院,西宁810001 [3]中国科学院地球环境研究所黄土与第四纪地质国家重点实验室,西安710075 [4]西北大学大陆动力学国家重点实验室,西安710069 [5]北京师范大学珠海分校法律与行政学院,广东珠海519087 [6]江西省庐山国土资源局,江西庐山332900 [7]南京大学地球科学学院,南京210093

出　　处：《地质学报》2013年第12期1922-1930,共9页Acta Geologica Sinica

基　　金：中国科学院地球环境研究所黄土与第四纪地质国家重点实验室开放基金项目(编号SKLLQG0701);湖南省重点学科建设项目(编号ZRDL0701);西北大学大陆动力学国家重点实验室开放基金项目(编号DL2006001)共同资助

摘　　要：通过对庐山（1997-2009）进行科学考察及深入研究，取得大校场沟口晚第四纪剖面地层的Rb—Sr-O稳定同位素的丰度检测数值，采用系统分析及综合研究将沉积地层划分为冰期一间冰期一冰缘期一冰后期的气候演化旋回：冰期阶段平均温度为-6．9℃，降水量约为550．1～1283．5mm；间冰期阶段平均温度约为8．O℃，降水量约为1650．2mm；冰缘期阶段平均温度约为0。5℃，降水量为1600．Omm，其惯性升温时年降水量可能为1650．2ram；冰后期阶段在其初期高温期年平均温度（温度负涨落现象未计算在内）为11．8℃，高温期年降水量约为1650．2mm；现代年平均温度为11．5℃，现代年降水量为1833．6mm。这是庐山地区首次在大校场沟口剖面获得的系统气候变化资料，可以为山地气候演化和区域响应与全球变化的分析提供新的科学信息。Detailed investigation and study of the Lushang area during 1997 to 2009 yielded Rb, Sr and O isotopic abundances of the late Quarternary strata. Systmatic analysis and research shows that the strata indicates a climatic cycle from glacial epoch, interglacial epoch, glacial marginal epoch to post-glacial epoch. The glacial epoch stage had a mean temperature of -6.9 ℃, and the precipitation was roughly for 550.1-1283.5 mm; inter-glacial epoch stage had a mean temperature of about to 8.0 ℃, and the precipitation was roughly for 1650.2 mm; glacial marginal epoch stage had a mean temperature of about to -4. 3 ℃, and the precipitation was 1600. 0 mm, with the precipitation reaching to 1650.2 mm during the heating. Post-glacial epoch stage had an average temperature of 11.8℃ at its early period, and the precipitation was 1650.2 mm; the average temperature in the modern time is around 11.5 ℃, with an average of precipitation 1833.6 mm. This study for the first time obtained this climate changing data for the section of the Dajiaochang fossa meatus in the Lushan area, and thus provide new scientific information for analyzing climatic evolution in the hilly area and regional response to global climate change.

关 键 词：同位素层型地层 标型环境事件 连续表层作用 气候演化旋回 庐山 

分 类 号：P597[天文地球—地球化学] P534.63[天文地球—地质学]