新疆叶城柯克亚8~3.85Ma沉积地层中常量和微量元素分布对气候演化的响应The Response of the Main and Trace Element Concentrations to Climate Evolvement in 8-3.85 Ma Sediment of the Kekeya Section at Yecheng,Xinjiang
叶荷;张克信;陈奋宁;陈锐明;徐亚东;季军良;
摘要(Abstract):
柯克亚剖面位于青藏高原西北缘新疆叶城县柯克亚乡,出露的地层由老到新为乌恰群、阿图什组和西域组,总厚度为2 217.9 m。在野外地层剖面详细实测与沉积相研究的基础上,系统采集了柯克亚剖面上8~3.85 Ma间沉积地层的地球化学样品并进行了常量和微量元素的测试和分析。剖面沉积物中元素平均值与上部陆壳(UCC)元素平均质量分数比揭示了研究区在8~3.85 Ma期间总体较为干旱寒冷的气候环境特征。在此基础上,结合具有较好指示作用的元素变化特征,根据CIA、w(CaO)/w(Sr)、w(Rb)/w(Sr)、w(CaO)/w(MgO)比值的变化将研究区的古气候变化分为3个阶段:剖面自下向上0~222 m(乌恰群第1~7层,年龄为8~7.3 Ma)为冷干气候;222~419 m(乌恰群第8~15层,年龄为7.3~6.6 Ma)为暖湿—冷干交替的气候;419~1 665 m(乌恰群第16层~阿图什组第24层,年龄为6.6~3.85 Ma)气候更为冷干。根据古气候研究结果推测青藏高原在8 Ma前已经隆升到了一定的高度,阻挡了来自印度洋的夏季风的北上,导致塔里木盆地干旱化。约6.6 Ma前气候的进一步变干可能与青藏高原的进一步隆升和来自西伯利亚的冬季风的进一步加强有关。
关键词(KeyWords): 叶城;晚新生代;常量元素;微量元素;气候演化
基金项目(Foundation): 中国地质调查局国家青藏专项(1212010610103);; 国家自然科学基金项目(40621002;40830212)
作者(Author): 叶荷;张克信;陈奋宁;陈锐明;徐亚东;季军良;
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参考文献(References):
- [1]刘英俊,曹励明,李兆麟,等.元素地球化学[M].北京:科学出版社,1984.
- [2]邓宏文,钱凯.沉积地球化学与环境分析[M].兰州:甘肃科学技术出版社,1993.
- [3]刘立,胡春燕.砂岩中主要碎屑成分的物源区意义[J].岩相古地理,1991(6):48-53.
- [4]钟巍,方小敏,李吉均,等.近7.0~0.73 Ma B.P.期间甘肃临夏盆地古气候演变的沉积物地球化学记录[J].干旱区资源与环境,1998,12(1):36-43.
- [5]钟巍,方小敏,李吉均,等.运用因子分析法提取青藏高原东北边缘临夏盆地近30 Ma B.P.以来沉积物氧化物含量的古气候信息[J].新疆大学学报:自然科学版,1998,15(4):74-81.
- [6]匡少平,徐仲,张书圣,等.运用地球化学方法研究中、新生代环境气候演替——兼论四川盆地侏罗纪气候变化[J].青岛化工学院学报,2002,23(1):4-9.
- [7]李明慧,康世昌.青藏高原湖泊沉积物对古气候环境变化的响应[J].盐湖研究,2007,15(1):63-72.
- [8]宋春晖,鲁新川,邢强,等.临夏盆地晚新生代沉积物元素特征与古气候变迁[J].沉积学报,2007,25(3):409-416.
- [9]Zheng Hongbo,Powell C M,An Zhisheng,et al.Pliocene upliftof the northern Tibetan Plateau[J].Geology,2000,28(8):715-718.
- [10]Sun Jimin,Liu Tungsheng.The age of the Taklimakan Desert[J].Science,2006,312:1 621.
- [11]Sun Jimin,Zhang Zhenqing,Zhang Liyuan.New evidence onthe age of the Taklimakan Desert[J].Geology,2009,37(2):159-162.
- [12]丁孝忠,郭宪璞,彭阳,等.塔里木盆地白垩纪-第三纪沉积相研究的进展[J].地球学报,1999,20(增刊):152-158.
- [13]郝诒纯,关绍曾,叶留生,等.塔里木盆地西部地区新近纪地层及古地理特征[J].地质学报,2002,76(3):289-297.
- [14]庄锡进,肖立新,杨军.塔里木盆地西南沉积相展布特征及演化[J].新疆地质,2002,20(增刊):78-82.
- [15]Zheng Hongbo,Huang Xiangtong,Butcher K.Lithostratigra-phy,petrography and facies analysis of the Late Cenozoic sedi-ments in the foreland basin of the West Kunlun[J].Palaeo-geography,Palaeoclimatology,Palaeoecology,2006,241:61-78.
- [16]金小赤,王军,陈炳蔚,等.新生代西昆仑隆升的地层学和沉积学记录[J].地质学报,2001,75(4):459-468.
- [17]Jin Xiaochi,Wang Jun,Chen Bingwei.Cenozoic depositional se-quences in the piedmont of the west Kunlun and their paleo-geographic and tectonic implications[J].Journal of AsianEarth Sciences,2003,21:755-765.
- [18]郑洪波,Butcher K,Powell C M.新疆叶城晚新生代山前盆地演化与青藏高原北缘的隆升——Ⅰ地层学与岩石学证据[J].沉积学报,2002,20(2):274-281.
- [19]郑洪波,Butcher K,Powell C M.新疆叶城晚新生代山前盆地演化与青藏高原北缘的隆升——Ⅱ沉积相与沉积盆地演化[J].沉积学报,2003,21(1):46-51.
- [20]裴军令,孙知明,李海兵,等.青藏高原西北缘晚新生代沉积岩古流向的磁化率各向异性确定及其构造意义[J].岩石学报,2008,24(7):1 613-1 620.
- [21]司家亮,李海兵,Laurie Barrier,等.青藏高原西北缘晚新生代的隆升特征——来自西昆仑山前盆地的沉积学证据[J].地质通报,2007,26(10):1 356-1 367.
- [22]张克信,王国灿,陈奋宁,等.青藏高原古近纪-新近纪隆升与沉积盆地分布耦合[J].地球科学:中国地质大学学报,2007,32(5):583-597.
- [23]Zhang Kexin,Wang Guocan,Cao Kai,et al.Cenozoic sedimen-tary records and geochronological constraints of differential up-lift of the Qinghai-Tibet Plateau[J].Science in China SeriesD,2008,51(11):1 658-1 672.
- [24]张克信,王国灿,曹凯,等.青藏高原新生代主要隆升事件:沉积响应与热年代学记录[J].中国科学:D辑,2008,38(12):1 473-1 604.
- [25]张克信,王国灿,季军良,等.青藏及邻区古近纪-新近纪地层分区与地层序列及其对高原隆升的响应[J].中国科学:D辑,2010,出版中.
- [26]韩吟文,马振东.地球化学[M].北京:地质出版社,2003.
- [27]王随继,黄杏珍,妥进才,等.泌阳凹陷核桃园组微量元素演化特征及其古气候意义[J].沉积学报,1997,15(2):65-70.
- [28]赵锦慧,王丹,鹿化煜,等.西宁地区黄土地球化学元素所揭示的古气候变化[J].干旱区资源与环境,2006,20(5):104-108.
- [29]Miller E K,Blum J D,Friedland A J.Determination of soil ex-changeable cation loss and weathering rates using Sr isotopes[J].Nature,1993,362:438-441.
- [30]Bain D C,Langan S J.Weathering rates in catchments calculat-ed by different methods and their relationship to acidic inputs[J].Water,Air and Soil Pollution,1995,85:1 051-1 056.
- [31]陈骏,安芷生,汪永进,等.最近800 ka洛川黄土剖面中Rb/Sr分布和古季风变迁[J].中国科学:D辑,1988,28(6):498-504.
- [32]陈骏,季峻峰,仇纲,等.陕西洛川黄土化学风化程度的地球化学研究[J].中国科学:D辑,1997,27(6):531-536.
- [33]Rea D K,Snoeck H,Joseph L H.Late Cenozoic eolian depo-sition in the North Pacific:Asian drying,Tibetan uplift,andcooling of the Northern Hemisphere[J].Paleoceanography,1998,13(3):215-224.
- [34]Billups K.Late Miocene through early Pliocene deep water cir-culation and climate change viewed from the sub-AntarcticSouth Atlantic[J].Palaeogeography,Palaeoclimatology,Palaeoecology,2002,185:287-307.
- [35]Billups K,Kelly C,Pierce E.The late Miocene to early Plio-cene climate transition in the Southern Ocean[J].Palaeogeog-raphy,Palaeoclimatology,Palaeoecology,2008,267:31-40.
- [36]Birkenmajer K,Gazdzicki A,Krajewski K P,et al.,First Ce-nozoic glaciers in West Antarctica[J].Polish Polar Research,2005,26(1):3-12.
- [37]Li F J,Rousseau D D,Wu N Q,et al.Late Neogene evolu-tion of the East Asian monsoon revealed by terrestrial molluskrecord in Western Chinese Loess Plateau:From winter to sum-mer dominated sub-regime[J].Earth and Planetary ScienceLetters,274(3/4):439-447.
- [38]Zachos J,Pagani M,Sloan L,et al.Trends,rhythms,andaberrations in global climate 65 Ma to present[J].Science,2001,292:686-693.
- [39]Kroon D,Steens T,Troelstra S R.Onset of monsoonal relat-ed upwelling in the western Arabian sea as revealed by plank-tonic foraminifers:Proceedings of the Ocean Drilling Program[J].Scientific Results,1991,117:257-263.
- [40]Haug G H,Tiedemann R.Effect of the formation of the Isth-mus of Panama on Atlantic ocean thermohaline circulation[J].Nature,1998,393:673-676.
- [41]Cane M A,Molnar P.Closing of the Indonesian seaway as aprecursor to east African aridification around 3-4 million yearsago[J].Nature,2001,411:157-162.
- [42]Duggen S,Hoernle K,Bogaard P,et al.Deep roots of theMessinian salinity crisis[J].Nature,2003,422:602-606.
- [43]Behrensmeyer A K,Quade J,Cerling T E,et al.The struc-ture and rate of late Miocene expansion of C4 plants:Evidencefrom lateral variation in stable isotopes in paleosols of the Si-walik Group,northern Pakistan[J].Geological Society of A-merica Bulletin,119:1 486-1 505.