石笋流体包裹体温度重建方法的现代过程评估  

Evaluation of modern processes in the method of temperature reconstruction using stalagmite fluid inclusions

作　　者：梁泽源 张海伟 田野[1] 张瑞[1] 宗保云 宁有丰[1] 贾雪雪 程海[1] Zeyuan Liang;Haiwei Zhang;Ye Tian;Rui Zhang;Baoyun Zong;Youfeng Ning;Xuexue Jia;Hai Cheng(Institute of Global Environmental Change,Xi’an Jiaotong University,Xi’an 710054,China)

机构地区：[1]西安交通大学全球环境变化研究院,西安710054

出　　处：《科学通报》2025年第2期275-287,共13页Chinese Science Bulletin

基　　金：国家自然科学基金(42261144753,42488201,41972186);西安交通大学青年拔尖人才项目资助。

摘　　要：当前流体包裹体提取测试技术在石笋研究中应用较少,利用石笋流体包裹体重建的温度记录仍需更多的其他记录和现代过程进行交叉验证.基于最新的石笋包裹体水同位素分析技术,本研究结合近现代石笋包裹体水同位素测试结果与洞穴现代过程监测,评估了该温度重建方法的可靠性以及现有温度计算公式的可靠性.利用监测的洞穴滴水和现生碳酸钙的同位素结果计算的洞穴温度月际变化与仪器监测结果相吻合,验证了当前的温度计算公式适用于研究地区洞穴温度的重建,并初步建立了神农宫地区的温度计算经验公式.使用西安交通大学同位素实验室的石笋包裹体水真空提取装置与水同位素分析仪Picarro L2140-i连接组成的测试系统,分析了四支近现代石笋的包裹体水氢、氧同位素(δD、δ^(18)O)组成,并利用初步建立的温度公式计算了近现代洞穴内部的绝对温度.本研究为未来利用石笋包裹体水同位素测试分析技术和方法重建过去长时间尺度的亚洲季风区绝对温度变化历史提供了重要的技术和理论支撑.Temperature is a key indicator in paleoclimate records,and high-precision reconstructions of past temperatures are central to paleoclimate research.In East Asia,scientists often rely on geological proxies such as tree rings,ice cores,and lake sediments to study historical temperature changes.However,high-resolution absolute temperature records remain limited,and many reconstructions may be affected by seasonal biases related to growth or deposition processes.Cave monitoring studies have shown that cave temperatures closely align with local annual averages,making stalagmite fluid inclusions a promising tool for reconstructing past temperatures with reduced seasonal biases.By integrating hydrological and climatic proxies such as hydrogen and oxygen isotopes,carbon isotopes,and trace elements,stalagmite fluid inclusions offer significant potential for detailed studies of regional hydrothermal variations.To improve temperature reconstruction from fluid inclusions,it is essential to calibrate and validate methods using cave monitoring data and recently active stalagmites.This study conducted isotopic analysis of fluid inclusions in modern stalagmites from Shennong Cave(117°15′N,28°42′E)in southeastern Jiangxi Province,China,to reconstruct temperature.We validated these findings using cave monitoring data collected from June 2022 to December 2023,aiming to confirm the methods and equations used for fluid inclusion temperature reconstruction in Chinese caves.Four actively growing calcite stalagmites(SNN2,SNN3,SNN4,and SNN5)were collected from Shennong Cave.Each stalagmite displayed dripping water and fresh deposits at the top during sampling,confirming active growth and alignment with the uranium-series dating results.TheδD andδ^(18)O values of fluid inclusions were analyzed using a system developed by Tian et al.(2020)at Xi’an Jiaotong University,equipped with a Picarro L2140-i water isotope analyzer and a vacuum crushing device.Monitoring data revealed a long-term decline inδ^(18)O values of drip water,infl

关 键 词：氧同位素 氢同位素 波长扫描光腔衰荡光谱技术(WS-CRDS) 大气降水线 绝对温度 

分 类 号：P532[天文地球—古生物学与地层学]