摘要
近年来,随着现代监测研究以及铀系定年技术的发展,石笋生长速率研究日趋得到了重视。本研究主要收集了我国内地地区已发表的17个洞穴的70支石笋的年代数据,计算并分析了冰期/间冰期尺度和全新世期间石笋生长速率的时空变化特征,发现规律如下:1)内陆干旱区科桑洞和东部季风区长江以北的3个洞穴(分别为珍珠洞、Buddha洞和三宝洞)的石笋呈现间冰期生长速率快,冰期生长速率较慢,甚至出现沉积间断;2)我国北方的琉璃洞、马沟洞、莲花洞(山西)、乌鸦洞、九仙洞和南方的莲花洞(湖南)、Dark洞和董哥洞表现为中全新世石笋生长速率较快,而早/晚全新世相对较慢;长江中下游地区的三宝洞和落水洞在早全新世期间生长速率较快,中/晚全新世较稳定;3)大多数洞穴石笋生长速率在近2ka B.P.以来呈现上升趋势,这些特征可能暗示了气候条件对石笋生长速率的影响。同时也发现:1)我国南部湿润区以及沿海地区的洞穴石笋生长速率在冰期/间冰期尺度呈现复杂多变的特征;2)不同洞穴之间或同一洞穴不同石笋之间,石笋生长速率均存在一定差异;这些结果表明洞穴系统内部的差异性会对石笋生长产生复杂影响。上述分析结果为认识我国石笋生长速率时空变化特征提供了一些基础性证据,但目前条件下,不建议将其作为单独的气候环境变化指标,而建议将其与其它石笋指标结合,开展多指标综合分析和验证。对于具体洞穴而言,现代监测对于理解石笋生长速率控制机制仍是必不可少的。
In recent decades,the development of uranium-dating technology and modern cave monitoring provide opportunities for the stalagmite growth rate as a paleoclimate proxy.Here,seventy stalagmites from seventeen caves were collected in China,including Kesang Cave in Xinjiang in Inland Arid region,Liuli Cave in Jilin Province,Zhenzhu Cave in Hebei Province,Lianhua Cave(Shanxi)in Shanxi Province,Magou Cave in Henan Province,Buddha Cave and Jiuxian Cave in Shaanxi Province,Wuya Cave in Gansu Province,Hulu Cave in Jiangsu Province,Sanbao Cave,Heshang Cave and Luoshuo Cave in Hubei Province,Lianhua Cave(Hunan)in Hunan Province,Yangzi Cave in Chongqing,Dark Cave and Dongge Cave in Guizhou Province and Xiaobailong Cave in Yunnan Province.Then,these stalagmites'age data with depth were also collected to calculate the stalagmite mean growth rate.And the spatial and temporal variations of stalagmite growth rates were highlight compared and analyzed at glacial-interglacial scale and the Holocene period.The results demonstrate some regular features:(1)The mean growth rates of stalagmites from Kesang Cave,Zhenzhu Cave,Buddha Cave and Sanbao Cave which are all in the north area of Yangtze River,show higher values during the interglacial period,but lower values or cessation during the glacial period;(2)The stalagmites from some caves in Northern China,such as Liuli Cave,Magou Cave,Lianhua Cave(Shanxi),Wuya Cave and Jiuxian Cave,and some caves in Southern China,including Lianhua(Hunan),Dark Cave,Dongge Cave,show faster growth rates in the Middle Holocene and slower in the Early and Late Holocene;However,the stalagmites growth rate in Sanbao and Luoshui caves in the lower-middle reaches of the Yangtze River,present higher values during the Early Holocene,and relatively lower and stable trend during the Middle and Late Holocene;(3)Stalagmites from most caves present an increasing trend of growth rate since about 2ka B.P.These results suggest that the climate conditions have a certain influence on the variation of stalagmite growth rate
作者
田怡苹
李云霞
光凯悦
李嘉燕
朱珊莹
Yongli GAO
饶志国
TIAN Yiping;LI Yunxia;GUANG Kaiyue;LI Jiayan;ZHU Shanying;Yongli GAO;RAO Zhiguo(School of Geographical Sciences,Hunan Normal University,Changsha 410081,Hunan;Department of Earth and Planetary Sciences,University of Texas at San Antonio,San Antonio TX 78249,USA)
出处
《第四纪研究》
CAS
CSCD
北大核心
2023年第1期20-32,共13页
Quaternary Sciences
基金
国家自然科学基金项目(批准号:4200180)
湖南省自然科学基金项目(批准号:2021JJ40349)
湖南省教育厅项目(批准号:20B351)共同资助。
