• 责任者：Liao Jin (State Key Laboratory of Biogeology and Environmental Geology ; China University of Geosciences ; Wuhan 430074 ; China) ; Hu Chaoyong
• 刊名：Quaternary Sciences
• 出版年：2013
• 卷期：33(6)
• 关键词：石笋微层 ; stalagmite microbanding ; 地质温度计 ; geologic thermometry
• 页码：p.1122-1129
• 图表：6 illus., 1 table, 48 refs.
• 分类号：1300
• issnNo：ISSN1001-7410
• isbnNo：CN11-2708/P

     Paleotemperature records are generally reconstructed from pollens, tree rings, ice cores and corals, but less from speleothems. In this paper, two 20th thermoluminescence （TL）intensity sequences of annual resolution are established based on two stalagmites to investigate the potential relationship between TL and temperature.  Two stalagmites were collected from Heshang cave （30°27＇N, 110°25＇E ; 294m） , south of Qingjiang valley, Changyang County, Hubei Province, Central China. As the study area is dominated by the Asian monsoon, the strong seasonality produced annually laminated speleothems in this cave.  The samples used in this study are from the top sections of stalagmites HS4 and HS6 deposited in recent 100 years. As annual δ18O records of HSd and HS6 during the last 100 years has been successfully established by He et al. E451 ,the exactly same samples, 64 from HS4 and 102 from HS6, has been used in this study to measure the thermoluminescence intensity. Carbonate samples were crushed by an agate mortar and sieved through 260 mesh, then 7.5mg powder was transferred to a sample pan for TL measurement by heating from 50℃ to around 400℃ in air at a heating rate of 5℃/s.  TL intensity records of HS4 and HS6 show similar variations on both annual and decadal scales. The intensity is low from 1870 to 1930,then abruptly increases in 1930＇s and maintains high values until 1950. After a gradual decrease from 1950 to 1970, the TL intensity subsequently oscillates between 1970 and 2000. The TL whole trend is coincident with the local modern annual temperature variation, except a lag of around 11 years. We postulate that chemiluminescence produced by surface oxidation of organic matters in speleothems contributes the TL and the process of dripping water in the karst system above the cave resulting in delayed response of TL to temperature. The correlation between the TL intensity and the temperature is significant （P〈0.01）for both H S4 （rM4 = 0.41 ）and H S6 （ r56 = 0. 49 ）. And the correlation coefficient increases to 0. 84 and 0.93 for HS4 and HS6 respectively after l 1-year running average. Based on the observations, we propose a novel thermometer for interannual and interdecadal temperature reconstructions with a high precision of 0. 2℃, which can play a key role in the quantitative reconstruction of paleotemperature records.