苏北盆地湖沼沉积记录的30～17cal ka BP期间的气候变化
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摘要
以苏北盆地里下河地区获取的SG钻孔沉积岩心为研究对象,进行了AMS14C年代、粒度、Rb和Sr含量分析。结果表明,苏北盆地湖沼沉积的粒度分布和Rb/Sr比值能够很好地指示东亚季风区的气候变化。根据粒度和Rb/Sr比值的变化,可将苏北盆地30~17cal ka BP期间的气候变化划分为3个阶段。在30.3~25.9cal ka BP期间,降雨量相对增多,气候相对湿润;25.9~18.3cal ka BP期间,降雨量减少,气候相对干旱;18.3~17.1cal ka BP期间,降雨量又明显增加,气候相对湿润,期间还可能存在变干突变。SG钻孔沉积岩心的环境代用指标与西峰黄土平均粒径、葫芦洞石笋氧同位素有着很好的可比性,并且SG钻孔沉积岩心的黏土含量趋势线与北半球30°N六月的太阳辐射强度曲线极为相似,这表明苏北盆地的气候受太阳辐射驱动下的东亚季风系统影响明显。
Sediment cores extracted in Lixiahe area of Subei Basin,eastern China,were analyzed at 2to3 cm intervals for grain size,Rb and Sr content.The results show that grain size distributions and Rb/Sr ratio of the lacustrine deposits can be the index of the past changes in East Asian monsoon precipitation.For instance,greater clay content,smaller mean grain size and higher Rb/Sr ratio reflect increased monsoon precipitation rates.The grain size and Rb/Sr ratio of SG core during 30-17 cal ka BP indicate that the paleoclimate in the region can be divided into three major stages.The first stage is from 30.3to 25.9cal ka BP,in which the climate was humid,and is marked by an higher precipitation rate and expanding water area,as indicated by higher clay content,smaller mean grain size and higher Rb/Sr ratio of SG core sediments.The second stage is from 25.9to 18.3cal ka BP,when the clay content and the mean grain size are relatively low and big,and the Rb/Sr ratio is relatively low,which suggests relatively low precipitation and the shrinkage water area.The third stage is from 18.3to 17.1cal ka BP,in which the climate became humid quickly,and is marked by a higher precipitation rate and expanding water area.The clay content and Rb/Sr ratio curves of SG core sediments are comparable to the mean grain size curve of Xifeng loess and stalagmites oxygen isotope curve of Hulu Cave,and the trend line of clay content curve of SG core sediment is similar to the solar insolation curve in June at 30°N.This indicates that the climate change of Subei Basin should be obviously affected by East Asian monsoon system driven by solar insolation.
Sediment cores extracted in Lixiahe area of Subei Basin,eastern China,were analyzed at 2to3 cm intervals for grain size,Rb and Sr content.The results show that grain size distributions and Rb/Sr ratio of the lacustrine deposits can be the index of the past changes in East Asian monsoon precipitation.For instance,greater clay content,smaller mean grain size and higher Rb/Sr ratio reflect increased monsoon precipitation rates.The grain size and Rb/Sr ratio of SG core during 30-17 cal ka BP indicate that the paleoclimate in the region can be divided into three major stages.The first stage is from 30.3to 25.9cal ka BP,in which the climate was humid,and is marked by an higher precipitation rate and expanding water area,as indicated by higher clay content,smaller mean grain size and higher Rb/Sr ratio of SG core sediments.The second stage is from 25.9to 18.3cal ka BP,when the clay content and the mean grain size are relatively low and big,and the Rb/Sr ratio is relatively low,which suggests relatively low precipitation and the shrinkage water area.The third stage is from 18.3to 17.1cal ka BP,in which the climate became humid quickly,and is marked by a higher precipitation rate and expanding water area.The clay content and Rb/Sr ratio curves of SG core sediments are comparable to the mean grain size curve of Xifeng loess and stalagmites oxygen isotope curve of Hulu Cave,and the trend line of clay content curve of SG core sediment is similar to the solar insolation curve in June at 30°N.This indicates that the climate change of Subei Basin should be obviously affected by East Asian monsoon system driven by solar insolation.
引文
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[23]孙倩,贾玉连,申洪源,等.内蒙古黄旗海全新世湖泊沉积物中Rb、Sr分布及其环境意义[J].古地理学报,2010,12(4):444-450.
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[29]施雅风,于革.40~30ka B.P.中国暖湿气候和海侵的特征与成因探讨[J].第四纪研究,2003,23(1):1-11.
[30]Wang L J,Sarnthein M,Grootes P M,et al.Millennial reoccurrence of century-scale abrupt events of East Asian monsoon:A possible heat conveyor for the global deglaciation[J].Paleoceanography,1999,14(6):725-731.
[31]Zhao K,Wang Y J,Edwards R L,et al.High-resolution stalagmiteδ18 O records of Asian monsoon changes in central and southern China spanning the MIS 3/2transition[J].Earth and Planetary Science Letters,2010,298(3):191-198.
[32]Wang Y J,Cheng H,Edwards R L,et al.A high-resolution absolution-dated late Pleistocene monsoon record from Hulu cave,China[J].Science,2001,294:2345-2348.
[33]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.
[34]Porter S C,An Z S.Correlation between climate events in the North Atlantic and China during the last glaciation[J].Nature,1995,375:305-308.
[35]Berger A,Loutre M F.Insolation values for the climate of the last 10 million years[J].Quaternary Science Reviews,1991,10:297-317.
[36]Wang Y J,Cheng H,Edwards R L,et al.Millennial-and orbitalscale changes in the East Asian monsoon over the past 224 000years[J].Nature,2008,451:1090-1093.
[2]虞志英,陈德昌,唐寅德.关于苏北中部平原海岸古砂堤形成年代的认识[J].海洋科学,1982,6(4):11-14.
[3]赵娟,范代读,李从先.苏北海岸带潮成辐射砂脊群的形成及其古地理意义[J].古地理学报,2004,6(1):41-48.
[4]杨怀仁,谢志仁.中国东部近20 000a来的气候波动与海面升降运动[J].海洋与湖沼,1984,15(1):1-13.
[5]赵希涛,李波,鲁刚毅,等.江苏阜宁西园全新世风暴沉积与海岸沙丘的发现及其意义[J].中国科学:B辑,1992,22(9):994-1001.
[6]赵希涛,鲁刚毅,王绍鸿,等.江苏建湖庆丰剖面全新世地层及其对环境变迁与海面变化的反映[J].中国科学:B辑,1991,21(9):992-1000.
[7]唐领余,沈才明,赵希涛,等.江苏建湖庆丰剖面1万年来的植被与气候[J].中国科学:B辑,1993,23(6):637-643.
[8]吴学忠,王绍鸿,赵希涛.江苏建湖地区全新世孢粉组合及其地质、古地理意义[J].地理科学,1996,16(3):252-259.
[9]朱诚,程鹏,卢春成,等.长江三角洲及苏北沿海地区7000年以来海岸线演变规律分析[J].地理科学,1996,16(3):207-213.
[10]张振克,谢丽,张云峰,等.苏北平原MIS3阶段海侵事件的沉积记录[J].第四纪研究,2010,30(5):883-891.
[11]舒强,陈晔,张茂恒,等.苏北平原周庄镇浅钻沉积物黏土矿物分布特征及其环境意义[J].地理科学,2012,32(2):238-243.
[12]舒强,陈晔,赵志军,等.江淮平原地区晚冰期以来的气候与环境变化记录[J].地理科学,2013,33(11):1377-1382.
[13]Stuiver M,Reimer P J,Reimer R.CALIB radiocarbon calibration[EB/OL].http:∥calib.qub.ac.uk/calib/
[14]Lerman A.Lakes:Chemistry,geology,physics[M].Berlin:Springer,1978:78-83.
[15]王苏民,冯敏.内蒙古岱海湖泊环境变化与东南季风强弱的关系[J].中国科学:B辑,1991,21(7):7759-7681.
[16]Chen J A,Wan G J.Sediment particle size distribution and its environment significance in Lake Erhai,Yunnan Province[J].Chinese Journal of Geochemistry,1999,18(4):314-320.
[17]谢远云,王秋良,李长安,等.湖泊沉积物粒度的气候指示意义:以江汉平原江陵剖面为例[J].地质科技情报,2004,23(4):41-43.
[18]董延钰,金芳,黄俊华.鄱阳湖沉积物粒度特征及其对形成演变过程的示踪意义[J].地质科技情报,2011,30(2):57-62.
[19]Chen J,An Z S,Wang Y J,et al.Distribution of Rb and Sr in the Luochuan loess-paleosol sequence of China during the last800ka:Implications for paleomonsoon variations[J].Sci.China:Earth Sciences,1999,42(3):225-232.
[20]陈骏,汪永进,季峻峰,等.陕西洛川黄土剖面的Rb/Sr值及其气候地层学意义[J].第四纪研究,1999,19(4):350-356.
[21]Goldich S S,Gast P W.Effcts of weathering on the Rb-Sr and K-Ar ages of biotite from the Morton Gneiss,Minnesota[J].Earth and Planetary Science Letters,1966,1(69):372-375.
[22]宋金明,徐亚岩,段丽琴.渤海湾百年来沉积物Li/Ba和Rb/Sr协同变化的地球化学特征与环境指示作用[J].海洋科学,2014,38(1):79-84.
[23]孙倩,贾玉连,申洪源,等.内蒙古黄旗海全新世湖泊沉积物中Rb、Sr分布及其环境意义[J].古地理学报,2010,12(4):444-450.
[24]舒强,萧家仪,张茂恒,等.苏北盆地末次间冰期以来的气候变化记录[J].地质科技情报,2008,27(5):59-64.
[25]Pachur H J,Wuhnemann B,Zhang H C.Lake evolution in the Tengger Desert,northwestern China during last 40,000years[J].Quaternary Research,1995,44:171-180.
[26]Chen F H,Bloemendal J,Wang J M,et al.High resolution multi-proxy climate records for Chinese loess evidence for rapid climatic change over the last 75 kyr[J].Palaeogeography,Palaeoclimatology,Palaeoecology,1997,130:325-335.
[27]Wu X H,Wang S M,An Z S,et al.Mangshan loess and its prospects for study of past global change[J].Scientia Geologica Sinica,1995(supple 1):115-120.
[28]Sun Y B,Wang X L,Liu Q S,et al.Impacts of post-depositional processes on rapid monsoon signals recorded by the last glacial loess deposits of northern China[J].Earth and Planetary Science Letters,2010,289(2):171-179.
[29]施雅风,于革.40~30ka B.P.中国暖湿气候和海侵的特征与成因探讨[J].第四纪研究,2003,23(1):1-11.
[30]Wang L J,Sarnthein M,Grootes P M,et al.Millennial reoccurrence of century-scale abrupt events of East Asian monsoon:A possible heat conveyor for the global deglaciation[J].Paleoceanography,1999,14(6):725-731.
[31]Zhao K,Wang Y J,Edwards R L,et al.High-resolution stalagmiteδ18 O records of Asian monsoon changes in central and southern China spanning the MIS 3/2transition[J].Earth and Planetary Science Letters,2010,298(3):191-198.
[32]Wang Y J,Cheng H,Edwards R L,et al.A high-resolution absolution-dated late Pleistocene monsoon record from Hulu cave,China[J].Science,2001,294:2345-2348.
[33]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.
[34]Porter S C,An Z S.Correlation between climate events in the North Atlantic and China during the last glaciation[J].Nature,1995,375:305-308.
[35]Berger A,Loutre M F.Insolation values for the climate of the last 10 million years[J].Quaternary Science Reviews,1991,10:297-317.
[36]Wang Y J,Cheng H,Edwards R L,et al.Millennial-and orbitalscale changes in the East Asian monsoon over the past 224 000years[J].Nature,2008,451:1090-1093.
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