桂林盘龙洞石笋发光性特征及其古环境记录的初步研究  

Luminescence and Palaeoenvironmental Record in a Stalagmite in Panlong Cave, Guilin

作　　者：李彬[1] 袁道先[1] 林玉石[1] Stein-ErikLauritzen 

机构地区：[1]中国地质科学院岩溶地质研究所 [2]挪威卑尔根大学地质系

出　　处：《地球学报（中国地质科学院院报）》1997年第4期400-406,共7页Acta Geoscientia Sinica

基　　金：国家自然科学基金

摘　　要：洞穴次生化学沉积物的发光性的研究可以提供分辨率更高的古环境变化信息。桂林盘龙洞一石笋发光性的研究表明，该地区在３．２～１．１万ａ之间普遍处于干冷条件下，而且微层发光谱线表明在此阶段仍存在多次次一级气候变化。在１．１３万ａ左右，谱线值突然由低升高，在１．１０万ａ后，在不断变化中逐渐上升，这可能是新仙女木事件（１．１３～１．１万ａ）在该地区的记录。此外，通过发光性记录与稳定同位素记录和微量元素记录的对比，其变化趋势基本一致，且具更高的分辨率。因此，洞穴次生化学沉积物发光性的研究可能会提供一个地区分辨率更高的古环境变化信息。Speleothem can provide some reliable palaeoenvironmental change information, which has been confirmed by many studies. The test part, about 16.3 cm, is taken from the lower part of the stalagmite of about 1.22 m long taken from Panlong cave, Guilin, China. The results show that the climate in Guilin area from 32000 a. B.P. to 11000 a. B.P. might be cold and dry. And the Luminescence spectral characteristics also show that there are many changes during this period. About 11300 a. B.P., the Luminescence spectral values abruptly change from low values to high values, and then gradually rise from 11000 a. B.P.. But there are several relative cold and dry periods, that is around 10700 a. B.P., around 10150 a. B.P., around 9000 a. B.P., and around 7200 a. B.P.. Since 7000 a. B.P., the climate might be more stable. In addition, the correlation between luminescence spectral records and 18 O records, microelement records shows that they are basically identical , and luminescence spectral records may have a higher resolution.

关 键 词：石笋 发光性 古环境变化 桂林 盘龙洞 

分 类 号：P531[天文地球—古生物学与地层学]