安徽蓬莱仙洞不同滴水点差异PCP作用及其古气候记录研究意义
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摘要
<正>石笋由于分布广泛、定年准确,并且具有丰富的气候和环境代用指标(如氧碳稳定同位素~([1,2])、微层厚度~([3])、微量元素~([4~6])等),因而受到古气候学家广泛关注。其中,微量元素和稳定碳同位素常被用来间接地反映局地干湿变化。当降水减少时,洞穴滴水在洞顶储存时间较长,使岩溶水在补给石笋之前已经发生了方解石沉积作用。由于Mg,Sr和Ba在方解石和溶液中的分配系数远小于1~([7,8]),从而使Ca优先于Mg,Sr和Ba沉积出来,使得溶液(渗流水及其所形成的滴水)和现代次生碳酸盐沉积物中的Mg,Sr和Ba富集,进而导致Mg/Ca,Sr/Ca和Ba/Ca比值增大~([4,5,9]),这种现象被称为方解石前期沉积作用(Prior Calcite Precipitation,简称PCP)。此外,当降水减少,洞穴滴水滴率变慢(即PCP作用增强)时,CO_2脱气时间增长也会导致石笋碳同位素偏
引文
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2 Frappier A,Sahagian D,Gonzalez L A et al.El Nino events recorded by stalagmite carbon isotopes.Science,2002,298(5593):565~565
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7 Gascoyne M.Trace-element partition coefficients in the calcite-water system and their paleoclimatic significance in cave studies.Journal of Hydrology,1983,61(1):213~222
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11 Frisia S,Fairchild I J,Fohlmeister J et al.Carbon mass-balance modelling and carbon isotope exchange processes in dynamic caves.Geochimica et Cosmochimica Acta,2011,75(2):380~400
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14张伟,段武辉,吴江滢等.南京葫芦洞缺失现代沉积的一个重要原因:盐效应?——与同一气候条件下安徽蓬莱仙洞的对比观测研究.第四纪研究,2012,32(2):361~368Zhang Wei,Duan Wuhui,Wu Jiangying et al.One of the important causes of lack of active speleothem in Nanjing Hulu cave:salting-in effect?——A comparative study with Penglaixian cave Anhui under the same climate conditions.Quaternary Sciences,2012,32(2):361~368
15张伟,李吉龙,谭明.安徽蓬莱仙洞.中国岩溶,2012,31(2):130~130Zhang Wei,Li Jilong,Tan Ming.Penglaixian cave,Anhui Province.Carsologica Sinica,2012,31(2):130~130
16吴江滢,汪永进,董进国.全新世东亚夏季风演化的辽宁暖和洞石笋δ~(18)O记录.第四纪研究,2011,31(6):990~998Wu Jiangying,Wang Yongjin,Dong Jinguo.Changes in East Asian summer monsoon during the Holocene recorded by stalagmiteδ~(18)O records from Liaoning Province.Quaternary Sciences,2011,31(6):990~998
2 Frappier A,Sahagian D,Gonzalez L A et al.El Nino events recorded by stalagmite carbon isotopes.Science,2002,298(5593):565~565
3 Tan M,Liu T,Hou J Z et al.Cyclic rapid warming on centennial-scale revealed by a 2650-year stalagmite record of warm season temperature.Geophysical Research.Letter,2003,30(12):1617~1620
4 Fairchild I J,Borsato A,Tooth A F et al.Controls on trace element(Sr-Mg)compositions of carbonate cave waters;Implications for speleothem climatic records.Chemical Geology,2000,166(3~4):255~269
5 Fairchild I J,Treble P C.Trace elements in speleothems as recorders of environmental change.Quaternary Science Reviews,2009,28(5~6):449~468
6 Wu J Y,Wang Y J,Cheng H et al.Stable isotope and trace element investigation of two contemporaneous annually-laminated stalagmites from Northeastern China surrounding the"8.2ka event".Climate of the Past,2012,8(5):1497~1507
7 Gascoyne M.Trace-element partition coefficients in the calcite-water system and their paleoclimatic significance in cave studies.Journal of Hydrology,1983,61(1):213~222
8 Rimstidt J D,Balog A,Webb J.Distribution of trace elements between carbonate minerals and aqueous solution.Geochimica et Cosmochimica Acta,1998,62(11):1851~1863
9 Hori M,Ishikawa T,Nagaishi K et al.Prior calcite precipitation and source mixing process influence Sr/Ca,Ba/Ca,~(87)Sr/~(86)Sr of a stalagmite developed in Southwestern Japan during 18.0~4.5ka.Chemical Geology,2013,347:190~198
10 Johnson K R,Hu C Y,Belshaw N S et al.Seasonal trace-element and stable-isotope variations in a Chinese speleothem:The potential for high-resolution paleomonsoon reconstruction.Earth and Planetary Science Letters,2006,244(1):394~407
11 Frisia S,Fairchild I J,Fohlmeister J et al.Carbon mass-balance modelling and carbon isotope exchange processes in dynamic caves.Geochimica et Cosmochimica Acta,2011,75(2):380~400
12 Tooth A F,Fairchild I J.Soil and karat aquifer hydrological controls on the geochemical evolution of speleothem-forming drip waters,Crag cave,Southwest Ireland.Journal of Hydrology,2003,273(1):51~68
13 Duan W H,Cai B G,Tan M et al.The growth mechanism of the aragonitic stalagmite laminae from Yunnan Xianren cave,SW China revealed by cave monitoring.Boreas,2012,41(1):113~123
14张伟,段武辉,吴江滢等.南京葫芦洞缺失现代沉积的一个重要原因:盐效应?——与同一气候条件下安徽蓬莱仙洞的对比观测研究.第四纪研究,2012,32(2):361~368Zhang Wei,Duan Wuhui,Wu Jiangying et al.One of the important causes of lack of active speleothem in Nanjing Hulu cave:salting-in effect?——A comparative study with Penglaixian cave Anhui under the same climate conditions.Quaternary Sciences,2012,32(2):361~368
15张伟,李吉龙,谭明.安徽蓬莱仙洞.中国岩溶,2012,31(2):130~130Zhang Wei,Li Jilong,Tan Ming.Penglaixian cave,Anhui Province.Carsologica Sinica,2012,31(2):130~130
16吴江滢,汪永进,董进国.全新世东亚夏季风演化的辽宁暖和洞石笋δ~(18)O记录.第四纪研究,2011,31(6):990~998Wu Jiangying,Wang Yongjin,Dong Jinguo.Changes in East Asian summer monsoon during the Holocene recorded by stalagmiteδ~(18)O records from Liaoning Province.Quaternary Sciences,2011,31(6):990~998
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