重庆新崖洞4.5ka以来气候变化的石笋微量元素记录及环境意义

doi:10.13249/j.cnki.sgs.2010.06.910

摘要/Abstract

摘要： 根据重庆新崖洞石笋XY6已有的碳氧同位素成果,进一步探讨微量元素指标(Mg/Ca,Sr/Ca,Ba/Ca及Mg/Sr)的气候及环境意义。认为Mg/Ca比值可以作为古降水的气候指标,极好地记录这4 500 a来的气候干湿变化,尤其对4 000 a B.P.左右的季风降水减少有明显的响应。此外,Mg/Ca与碳氧同位素记录反映的气候信息也基本一致。Sr/Ca和Ba/Ca与Mg/Ca比值的变化也有相似性,但其作为气候指标的稳定性较差,易受到地表植被、土壤微生物活动等众多因素的干扰。

Abstract: High-resolution stalagmite records serve as excellent proxy of investigating past climatic and environmental changes, and multiproxy studies have enormous potential in identifying process controls and fulfilling the potential of speleothems in paleoclimatical and palaeoenvironmental analysis. In this paper, climate change and environmental significance of trace-element ratios from stalagmite XY6(such as Mg/Ca, Sr/Ca, Ba/Ca, Mg/Sr) were discussed by comparing with the stable oxygen and carbon isotopes results of stalagmite XY6 from Xinya Cave in Chongqing.The results showed that the Mg/Ca ratio can be used as a climatic proxy of precipitation, indicating the climate change since 4.5 ka B.P., and agreed well with the climatic change revealed by oxygen and carbon isotopes records. Notably, the Mg/Ca ratio was sensitive to the event of abrupt decline in precipitation at 4.0 ka B.P. Although the time series of Sr/Ca and Ba/Ca ratios coincides roughly with to the variation of Mg/Ca, they were readily disturbed by many factors such as vegetation and soil microbes, thus are less stable.

中图分类号:

P532

王建力, 何潇, 李清, 李廷勇, 王勇. 重庆新崖洞4.5ka以来气候变化的石笋微量元素记录及环境意义[J]. 地理科学, 2010, 30(6): 910-915.

WANG Jian-li, HE Xiao, LI Qing, LI Ting-yong, WANG Yong. Climate Change Since 4.5 ka B.P. Recorded by Trace Elements in a Stalagmite from Xinya Cave in Chongqing[J]. SCIENTIA GEOGRAPHICA SINICA, 2010, 30(6): 910-915.

参考文献

[1] Wang Y J,Cheng H,Edwards R L,et al.Millennial-and orbital-scale changes in the East Asian monsoon over the past 224 000 years[J].Nature,2008,451:1090-1093.
[2] Wang Y J,Cheng H,Edwards R L,et al.A High-solution absolute-dated late Pleistocene Monsoon record from Hulu cave[J].China Science,2001,294:2345-2348.
[3] Yuan D X,Cheng H,Edwards R L,et al.Timing, duration,and transitions of the last interglacial Asian monsoon[J].Science,2004,304:575-578.
[4] 王建力,王丽,何潇,等.重庆地区末次冰期气候变化的石笋记录研究[J].地理科学,2006,26(5):580~585.
[5] 李明霞,汪永进,邱庆伦.中全新世7~6 ka东亚季风气候的高分辨率石笋记录[J].地理科学,2007,27(4):519~524.
[6] Brecker W S.Radiocarbon measurement and annual rings in cave fo rmations[J].Nature,1960,185:93-94.
[7] 谭明,秦小光,沈凛梅,等.中国洞穴碳酸盐双重光性显微旋回及其意义[J].科学通报,1999,44(6):646~648.
[8] 刘东生,谭明,秦小光,等.洞穴碳酸钙微层理在中国的首次发现及其对全球变化研究的意义[J].第四纪研究,1997,17(1):41~51.
[9] 吴江滢,邵晓华,汪永进.南京年纹层石笋δ¹⁸O记录的冰期气候事件特征[J].地理科学,2007,27(1):75~80.
[10] Ian J Fairchild a,Pauline C Treble.Trace elements in speleothems as recorders of environmental change[J].Quaternary Science Reviews,2009,28:449-468.
[11] Hu C Y,Henderson G M,Huang J H,et al.Quantification of Holocene Asian monsoon rainfall from spatially separated cave record[J].Earth Planet Sci Lett,2008,266:221-232.
[12] Kathleen R.Johnson,Chaoyong Hu,Nick S,et al.Henderson.Seasonal trace-element and stable-isotope variations in a Chinese speleothem:The potential for high-resolution paleomonsoon reconstruction[J].Earth and Planetary Science Letters 2006,244:394-407.
[13] Andrea Borsato,Silvia Frisia,Ian J Fairchild,et al.Trace element istribution in annual stalagmite laminaemapped by micrometer-resolution X-ray fluorescence: Implications for incorporation of environmentally significant species[J].Geochimica et Cosmochimica Acta, 2007,71:1494-1512.
[14] 李彬,袁道先,林玉石,等.洞穴此生化学沉积物中Mg、Sr、Ca及其比值的环境指代意义[J].中国岩溶,2000,19(2):115~122.
[15] 邵晓华,汪永进,孔兴功,等.南京葫芦洞石笋生长速率及其气候意义探讨[J].地理科学,2003,23(3):304~309.
[16] 何潇,王建力,李清,等.重庆地区石笋沉积速率与古气候意义初探[J].中国岩溶,2007,26(3):196~201.
[17] 林玉石,张美良,覃嘉铭.洞穴石笋沉积速率研究中值得注意的几个问题[J].中国岩溶,2001,20(2):131~136.
[18] Goede A,Vogel J C.Trace element variation and dating of a L ate P leistocene Tasmanian speleo them [J].Palaeo-geography Palaeoclimatology Palaeoecology,1991,88:121-131.
[19] Gascoyne M.Trace-element partition coefficients in the calcite-water system and their paleoclimatic significance in cave studies[J].Journal of Hydrology,1983,61(1-3):213-222.
[20] 马志邦,李红春,夏明,等.距今3 ka来京东地区的古温度变化:石笋Mg/Sr记录[J].科学通报,2002,47(23):1829~1834.
[21] Roberts M S,Smart P L,Baker A.Annual trace element variations in a Holocene speleothem[J].Earth and Planetary Science Letters,1998,154:237-246.
[22] Hu C Y,Henderson G M,Huang J H,et al.Quantification of Holocene Asian monsoon rainfall from spatially separated cave record[J].Earth Planet Sci Lett,2008,266:221-232.
[23] 李廷勇,李红春,袁道先,等.重庆新崖洞XY6石笋高分辨率δ¹⁸O、δ¹³C记录的4.5 ka以来气候变化[J].中国岩溶,2006,25(2):95~100.
[24] 陈伟海,朱德浩,朱学稳,等.奉节天坑地缝岩溶景观及世界自然遗产价值研究[M].北京:地质出版社(第一版).2003:1~13.
[25] 吴江滢.晚冰期南京石笋十年际气候序列重建.南京大学博士学位论文,2003.
[26] 李清,王建力,李红春,等.重庆地区石笋记录中Mg/Ca比值及古气候意义[J].中国岩溶,2008,27(2):145~150.
[27] 汪卫国,冯兆东,李心清,等.蒙古北部Gun Nuur 湖记录的全新世气候突发事件[J].科学通报,2004,49(1):27~33.
[28] 沈吉,刘兴起,R M atsumo to,等.晚冰期以来青海湖沉积物多指标高分辨率的古气候演化[J].中国科学(D辑),2004,34(6):582~589.
[29] 吴中海,赵希涛,吴珍汉,等.西藏纳木错及邻区全新世气候与环境变化的地质记录[J].冰川冻土,2004,26(3):275~283.
[30] 邵晓华,汪永进,程海,等.全新世季风气候演化与干旱事件的湖北神农架石笋记录[J].科学通报,2006,51(1):80~86.