泰国南部石笋记录的晚全新世早期水文气候变化研究  

Hydroclimate variability in early stage of late Holocene recorded by stalagmite from Southern Thailand

作　　者：殷建军[1] 许琦[1] SIRIPORNPIBUL Chaiporn SIRIPATTARAPUREENON Russarint 吴夏[1] 唐伟[1] 程海[3] 宁有丰[3] 秦正峰 YIN Jianjun;XU Qi;SIRIPORNPIBUL Chaiporn;SIRIPATTARAPUREENON Russarint;WU Xia;TANG Wei;CHENG Hai;NING Youfeng;QIN Zhengfeng(Key Laboratory of Karst Dynamics,MNR&GZAR/International Research Centre on Karst under the Auspices of UNESCO/Institute of Karst Geology,CAGS,Guilin,Guangxi 541004,China;Department of Mineral Resources,Ministry of Natural Resources and Environment,Bangkok 10400,Thailand;Institute of Global Environmental Change,Xi’an Jiaotong University,Xi'an,Shaanxi 712000,China)

机构地区：[1]自然资源部、广西岩溶动力学重点实验室/联合国教科文组织国际岩溶研究中心/中国地质科学院岩溶地质研究所,广西桂林541004 [2]泰国自然资源与环境部矿产资源厅,泰国曼谷10400 [3]西安交通大学全球环境变化研究院,陕西西安712000

出　　处：《中国岩溶》2023年第3期573-581,共9页Carsologica Sinica

基　　金：中国地质调查局“一带一路”重点区岩溶地质调查与编图(DD20221808);中国地质科学院岩溶地质研究所基本科研业务费项目(2021002);中国地质调查局“一带一路”重点区岩溶地质环境对比与编图(DD20190452)。

摘　　要：中晚全新世气候转型期(4.2 ka事件)气候变化对全球多地古文明产生了重要影响,但该事件是否为一次全球性的气候事件,目前仍存在一定的争议。因此,针对该事件有必要开展全球范围的研究工作。文章以泰国南部洞穴石笋为研究对象,通过年代学研究、碳氧稳定同位素测试分析重建了该区域晚全新世早期水文气候变化历史。研究结果显示,该区域水文气候响应亚洲夏季风变化,晚全新世早期夏季风降水呈现逐渐减少的趋势。两次年代际干旱事件(距今3850−3840年和距今3805−3795年)主要受到太阳活动减弱和厄尔尼诺事件的影响。总体而言,该区域水文气候变化受到热带辐合带(ITCZ)位置南北移动的控制。The climate change during the transition of the middle-to-late Holocene(4.2 ka event)is linked to the collapse of many paleo-cultures worldwide.However,it is still controversial in the following two questions,Is the 4.2 ka event global,and what is the relationship between the climate change and its societal effect?Though it is difficult to identify the relationship,we can construct paleoclimate records from different places all over the world to identify whether the 4.2 ka event is global.In the karst survey in 2019,we found many ancient cultural remains in caves of Southern Thailand,and the time span of many remains covers the 4.2 ka event.However,there are relatively few records on the 4.2 ka event with high precision and high resolution that can reveal the climate and environment in this area.To better understand the 4.2 ka event,we choose the stalagmite record from Phet Cave in Southern Thailand to verify the event in a tropical area.The climate in Southern Thailand is dominated by the tropical monsoon system.The mean values of annual temperature and precipitation are 27.1℃and 2,390 mm,respectively.Precipitation in the rainy season from May to November accounts for 76%of the annual value.The Phet Cave(8°23′36″N,98°46′26″E,54 m a.s.l.)is a dry underground river cave developed along the local fault,and the cave environment is relatively stable.The stalagmite D008-05 is a pure aragonite stalagmite with a length of about 18 cm and a diameter of 5-6 cm.To determine the age of the stalagmite,10 powder subsamples were collected for 230Th/U dating through the Neptune MC-ICP-MS in the Isotope Laboratory of Xi'an Jiaotong University.We got the dating results with relatively high precision-high uranium and low 232Th concentration.The age model was constructed through the StalAge.We confirm that the stalagmite grew in the early stage of the Late Holocene,from 3,738 a B.P.to 3,906 a B.P.,and the mean growth rate was 0.95 mm·a^(−1).We drilled theδ18O andδ13C samples from the top of the stalagmite with an i

关 键 词：亚洲夏季风 石笋 水文气候 晚全新世早期 泰国南部 

分 类 号：P532[天文地球—古生物学与地层学]