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作者简介:

陈奋宁,女,1983年生。高级工程师,主要从事地层古生物和沉积学研究。E-mail:fenningc@163.com。

通讯作者:

陈锐明,男,1985年生。高级工程师,主要从事区域地质和新生代环境气候演变研究。E-mail:cruiming@mail.cgs.gov.cn。

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目录contents

    摘要

    笔者在西藏南部札达盆地新生代沉积地层中获得了丰富的介形类化石,根据介形类动物群在地层剖面上的分布规律,建立了两个介形类组合带:①Ilyocypris bradyi-Cyclocypris orum-Leucocythere dorsotuberosa组合带;②Leucocytherella-Candoniella zadaensis-Leucocythere mirabilis 组合带。通过对研究区介形类组合带与国内外其他地区相同层位的介形类组合对比研究,将札达盆地托林组的时代厘定为中新世晚期—上新世最晚期。根据介形类动物群在剖面上的分布规律,自下而上建立了7个介形类群落:Candona-Candoniella群落;Ilyocypris-Cyclocypris群落;Leucocythere-Candona群落;Ilyocypris-Leucocythere群落;Leucocythere-Leucocytherella-Candona群落;Leucocythere mirabilis-Candona群落和Ilyocypris-Leucocytherella群落。通过对介形类群落详细的特征分析并结合磁性地层年代学数据,将札达盆地9.5~1.7 Ma的古气候划分为6个期次:①9.5~8.4 Ma为凉湿期;②8.4~6.3 Ma为温湿期;③6.3~5.5 Ma为凉湿期;④5.5~4.4 Ma为温湿期;⑤4.4~2.8 Ma为冷湿期;⑥2.8~1.7 Ma为温暖偏干期。将研究区9.5 Ma以来的气候演化特征与全球气候演变对比认为:札达盆地9.5~6.3 Ma间的气候以暖湿为主,可能与来自印度的东南季风加强有关;6.3~3.6 Ma间札达盆地古气候分析显示为相对暖湿期,存在气候波动,可能与来自印度洋的东南季风再次加强有关;3.6 Ma以后由于受全球气候变冷、冬季风加强及青藏高原强烈隆升的影响,札达盆地气候向寒冷干旱的环境转变,在2.8~1.7 Ma气候却变得温暖潮湿。

    Abstract

    The Cenozoic strata of the Zanda basin in southern Tibet have yielded abundant ostracoda fossils.Two ostracoda assemblages have been established based on the distribution patterns of the ostracoda fauna on the stratigraphic profile: ① Ilyocypris bradyi-Cyclocypris orum-Leucocythere dorsotuberosa assemblage;and ② Leucocytherella-Candoniella zadaensis-Leucocythere mirabilis assemblage. Through comparison of the ostracod assemblages of the study area with those found worldwide at the same stratum, the age of the Tuolin Formation in Zanda basin has been redefined to late Miocene to Pliocene.Based on the distribution characteristics of the fossil succession, the ostracoda fauna in the study area has been be divided into seven ostracoda communities in ascending order: Candona-Candoniella community;Ilyocypris-Cyclocypris community;Leucocythere-Candona community;Ilyocypris-Leucocythere community;Leucocythere-Leucocytherella-Candona community;Leucocythere mirabilis-Candona community and Ilyocypris-Leucocytherella community.Through detailed character analysis of ostracod communities and the magnetostratigraphic chronological data, the paleoclimate of the Zanda basin during 9.5~1.7 Ma was divided into six periods: ① the cool and wet period (9.5~8.4 Ma);② the warm and humid period (8.4~6.3 Ma); ③ the cool and wet period (6.3~5.5 Ma); ④ the warm and humid period (5.5~4.4 Ma); ⑤ the cold and wet period (4.4~2.8 Ma); and ⑥ the warm and dry period (2.8~1.7 Ma).Through a comparison of the climate evolution characteristics of the study area with the global climate evolution since 9.5 Ma, it is postulated that the Zanda basin experienced primarily warm and humid conditions between 9.5 Ma and 6.3 Ma, likely related to the strengthening of the southeast monsoon from India.The paleoclimate analysis of the Zanda basin during the interval 6.3~3.6 Ma indicates a relatively warm and humid period, with climate fluctuations, possibly due to the re-strengthening of the southeast monsoon from the Indian Ocean.Subsequently, after 3.6 Ma, the influence of the global climate cooling, winter monsoon strengthening, and the strong uplift of the Qinghai Tibet Plateau caused a shift towards a cold and dry environment in the Zanda basin.However, the area experienced a transition to a warm and humid climate between 2.8 Ma and 1.7 Ma.

  • 札达盆地地处喜马拉雅褶冲带,为一个东北侧受北西—南东向喀喇昆仑断裂控制的半地堑盆地。其良好的沉积记录为古环境变化与构造沉积耦合提供了良好的研究材料。前人在很多方面对札达盆地新生代地层进行了不同程度的考察和研究(张青松等,1981;西藏自治区地质矿产局,1993;张克信等,2010Xie Shucheng et al.,2012吴旌等,2012),在盆地新生代地层中发现了保存良好的哺乳动物(孟宪刚等,20042005)、植物和孢粉(李建国等,2001韩建恩等,2005吕荣平等,2006余佳等,2007; 江尚松等,2010)等生物化石;获得了托林组和香孜组最新的古地磁年龄(钱方,1999朱大岗等,2007a王世锋等,2008Saylor et al.,2009)并且对札达盆地的基本地质构造特征与构造演化进行了讨论(邵兆刚等,2006孟宪刚等,2006张克信,2007)。以上成果为本次研究提供了基础地质材料。

  • 札达盆地新生代地层介形类研究已取得了许多进展。早在20世纪80年代初,张青松等(1981)首次报道了札达盆地的介形类化石,之后朱大岗等(2007b)对札达盆地的托林组上部介形类化石进行了较详细的古环境、古气候研究。但是前人进行介形类组合研究的这些地层并不能代表札达盆地完整的沉积序列,对于托林组下部的研究目前仍为空白,且没有进行区域及全球气候的对比。

  • 本次研究的多几东剖面代表了札达盆地9.5~1.7 Ma的完整沉积地层序列,是研究该盆地新近纪古环境变化的良好载体。通过对札达盆地新近系—第四系精细地层剖面测制和介形类群落研究,以期建立札达盆地9.5~1.7 Ma精细的沉积序列、介形类生物地层,进一步探讨该地区的古环境变化并与全球气候进行对比。

  • 1 地质背景及剖面简介

  • 札达盆地位于西藏自治区西南部阿里地区象泉河流域,岗仁波齐峰的西侧,属喜马拉雅褶冲带。其形成和发育受控于青藏高原两体三带”构造格局的发展演化,即喜马拉雅造山带的北坡、喀喇昆仑造山带的东南端(阿伊拉日居山)和雅鲁藏布江缝合带西北端的结合地带,也是冈底斯地体和喜马拉雅地体结合部(潘桂棠等,2002)。札达盆地的控盆断裂为西南侧藏南拆离系和东北侧的阿伊拉日居山断裂。盆内新近纪地层近水平产出,基底为侏罗纪—白垩纪砂岩,地层出露厚度在盆地南缘达到最大(王世峰等,2008)。盆地周围山体主体呈北西—北西西方向延伸,地势南西(喜马拉雅山脉)和北东(阿依拉日居山脉)两侧高,平均海拔在4 km以上,呈向西北开口的喇叭状。盆地东西长约140 km,南北最大宽度为50 km,面积约为4×104 km2,属侵蚀剥蚀极高山地貌。

  • 本次研究剖面位于西藏自治区札达县城南4 km的岗桑—多几东沟一线(以下简称多几东剖面),剖面起点坐标为79.75°E,31.48°N;终点坐标为79.74°E,31.38°N(图1),自下而上出露的地层为中新统—下更新统托林组(610.2 m)和下更新统香孜组(>44.3 m),剖面总厚约654.5 m。托林组(图2)区域上与下伏中侏罗统聂聂雄拉组呈角度不整合接触(李海兵等,2006),和上覆下更新统香孜组呈整合接触(图1)。

  • 多几东剖面托林组下部主要为砾岩、砂岩、粉砂岩、泥岩的正粒序旋回,托林组中部砂岩向上变细,为砂岩、粉砂泥岩互层,顶部砾岩和砂岩层增多。该组主要发育的沉积相为辫状河相、湖泊相、湖泊三角洲相和扇三角洲相(吴旌等,2012)。香孜组主要岩性为灰白、褐色厚层—巨厚层复成分砾岩,灰褐、灰绿色砂岩,夹灰色粉砂岩和蓝灰、土黄色泥岩。该组以冲积扇相为主(吴旌等,2012)。

  • 札达盆地控盆断裂为东北侧的北西—南东向喀喇昆仑断裂以及西南侧近东西向的藏南拆离系。其中,喀喇昆仑断裂(KKF)的初始活动时间早于27 Ma(李海兵等,20062007),且持续活动至12 Ma左右(Murphy et al.,2000Lacassin et al.,2004Phillips et al.,2004李海兵等,2007),其后在8.75~6.88 Ma之间再次发生强烈走滑变形(Zhou Yong et al.,2001),断裂活动一直延续到晚更新世。藏南拆离系(STDS)西起喜马拉雅西部的扎斯卡地区,经中部的珠穆朗玛地区到东部的米林地区,是分隔高喜马拉雅变质结晶基底和藏南特提斯沉积盖层的低角度正断裂(Harrison et al.,1995);其被藏南南北向正断层切割,反映其活动时间上限为9~8 Ma(Burchfiel et al.,1992Harrison et al.,1995),对应了札达盆地初始裂陷形成的时间。根据Saylor et al.(2009)的最新古地磁年代学的研究成果,结合三趾马动物群的出现和C3-C4植物型演化的时限,认为本次实测剖面年龄时限为9.5~1.7 Ma。

  • 2 样品与工作方法

  • 对实测的多几东沟剖面的托林组和香孜组下部,自下而上系统采集介形类样品共计154件,介形类样品主要取自泥岩和粉砂岩,泥岩和粉砂岩的取样间距一般为20 cm,粗粒沉积的取样间距一般为150 cm。每件样品称取100 g干样进行介形类分析,先将样品在烧杯中用水浸泡24~48 h,待样品散开后分别用450 μm、300 μm和225 μm筛过筛,其中300 μm和225 μm两类粒度的样品是含介形类化石的主体,将用于本文分析。样品干燥后在实体显微镜下进行挑样、鉴定分析(化石鉴定工作由作者本人独立完成)和定量统计(以100 g干样计算)。

  • 物种多样性的测度本文采用信息函数数理统计方法,应用电子计算机对研究区中新世晚期—上新世介形类群落的复合分异度指数、群落优势度指数、均衡度指数3类进行了计算。计算结果明确地反映了介形类群落中种的多样化程度、种数和各种个体分配的均匀程度,以及群落与环境的关系。生物多样性指数分析在Excel中采用以下公式计算:

  • H=i=1s PilnPiPi=niN

  • 生态优势度指数(D)的计算公式为:

  • D=Pi2

  • 图1 札达盆地地质构造简图及其剖面位置图(据吴旌等,2013

  • Fig.1 Simplified geological-structural map of the Zanda basin (after Wu Jing et al., 2013)

  • (a)—札达盆地地质简图;(b)—札达盆地大地构造位置;1—第四系;2—新近系;3—拉弄拉组;4—聂聂雄拉组;5—拉吾且拉组;6—沙赛组;7—穷果群; 8—曲嘎组; 9—滚江浦组; 10—哲弄组; 11—幕霞群; 12—波库混杂岩; 13—县; 14—居民点; 15—推测断层; 16-角度不整合; 17—整合界线;18—公路;19—河流;ATF—阿尔金断裂; JUF—宗务隆断裂;MJF—木孜塔格-鲸鱼湖断裂;XIF—西金乌兰-金沙江断裂;BNF—班公湖-怒江断裂;KKF—喀喇昆仑断裂;YZS—雅鲁藏布江缝合带; STDS—藏南拆离系;MCT—主中央断裂;MBT—主边界断裂

  • (a) —simplified geological map of the Zada basin; (b) —tectonic location map of the Zada basin; 1—Quaternary; 2—Neogene; 3—Larongla Formation; 4—Nieniaxiong La Formation; 5—Lawuqila Formation; 6—Shasai Formaition; 7—Qiongguo Group; 8—Quga Formation; 9—Kunjiangpu Formation; 10—Zhelong Formation; 11—Muxia Group; 12—Boku mélange; 13—towns; 14—settlements; 15—inferred fault; 16—angular unconformity; 17—integration boundary; 18—road; 19—rivers; ATF—Altyn fault; JUF—Zongwulong fault; MJF—Muztag-Whale Lake fault; XIF—XiJinwulan-Jinshajiang fault; BNF—Bangonghu-Nujiang fault; KKF—Karakoram fault; YZS—Yarlung Zangbo suture zone; STDS— South Tibet Detachment System; MCT—Main Central Thrust; MBT—Main Boundary Thrust

  • 式中:H群落复合分异度指数;S为物种数;Pi为种i个种的个数(ni)在整个生物群中种的总个体数(N)中所占的比例(Pi=ni/N);InpiPi的自然对数。

  • 3 介形类化石组合带

  • 本次在札达盆地托林组实测剖面自下而上逐层采集到154件介形类样品,其中共72个层位中见介形类个体24010个,壳体以单瓣壳为主,少数为双瓣壳,经鉴定共识别出介形类9属32种,其中5个未定种,典型属种见图3、4。根据介形类属种在剖面上的分布特点,将该剖面介形类自下而上划分为2个介形类组合带(图5)。

  • 3.1 Ilycocyprisbradyi-Cyclocyprisorum-Leucocytheredorsotuberosa 组合带

  • 该组合带分布于托林组的第13~73层,主要分子为IlycocyprisbradyiI.peudobradyiI.xizangensisI.subdushanensisCycleocypris ovum,Candona sp.,CandonaxizangensisCandoniellazadaensisLeucocytheredorsotuberosaL.parasculptaL.gongheensisL.subgongheensis。其次为 I.qaidamensisL.sp.,L.mirabilisL.exilitropisL.burangensisL.tropisL.nodaL.subscunlptaEucypriszandanensisE.subgyrongensisFabeaformiscandonafabeaformis。此外,见C.candida,C.subixzangensisC.himalayaensisC.gyrongensisCandoniella sp.,L.latizonaL.subsculptaHerpetocyprella sp.

  • 图2 西藏札达盆地多几东新近系托林组柱状图

  • Fig.2 Stratigraphic column of the Neogene Tuolin Formation in the Zanda basin, Tibet

  • 1--平行层理; 2--水平层理; 3--板状交错层理; 4--楔状交错层理; 5--叠瓦状构造; 6--砂砾岩透镜体;7--砾岩;8--含砾砂岩;9--砂岩;10--粉砂岩;11--泥质粉砂岩;12--粉砂质泥岩、泥岩; 13--三趾马化石点

  • 1--parallel bedding; 2--horizontal bedding; 3--plate cross bedding; 4--wedge shaped cross bedding; 5--imbricate structure; 6--glutenite lens; 7--conglomerate; 8--gravelly sandstone; 9--sandstone; 10--siltstone; 11--argillaceous siltstone; 12--silty mudstone and mudstone; 13--hipparion fossil spot

  • 图3 西藏札达盆地多几东沟剖面典型介形类化石1

  • Fig.3 Selected ostracod species from the Duojidong section in the Zanda basin, Tibet, Part 1

  • 1~24—介形类化石均采自札达盆地多几东沟中新统-更新统剖面,白色线段代表100 μm;1—Ilyocyprisxizangensis外视,右瓣,登记号S15JL24-1;2—I. xizangensis外视,右瓣,登记号S15JL62-9;3—I. xizangensis外视,右瓣,登记号S15JL83-14;4—I. bradyi外视,左瓣,登记号S15JL26-1;5—I. peudobradyi外视,右瓣,登记号S15JL69-1;6—I. peudobradyi外视,右瓣,登记号S15JL69-4;7—Ilyocypris sp.外视,左瓣,登记号S15JL126-4;8—Ilyocypris sp.外视,左瓣,登记号S15JL133-1;9—I. gibba外视,左瓣,登记号S15JL133-15;10—I. subdushanensis外视,左瓣,登记号S15JL141-9;11—I. subdushanensis外视,左瓣,登记号S15JL137-2;12—I. subdushanensis外视,左瓣,登记号S15JL119-5;13—Cyclocyprisorum 外视,左瓣,登记号S15JL29-4;14—C. paraovata外视,左瓣,登记号S15JL62-17;15—Cyclocypris sp. 外视,左瓣,登记号S15JL59-6;16—Pseudocandonacompressa外视,右瓣,登记号S15JL87-4;17—Eucypriszandanensis外视,左瓣,登记号S15JL61-3;18—Eucyprissp. 外视,右瓣,登记号S15JL62-21;19—Eucypris sp. 外视,左瓣,登记号S15JL83-8;20—E. concinnaqaidamensis外视,右瓣,登记号S15JL62-14;21—Eucyprissp. 外视,右瓣,登记号S15JL83-19;22—Herpetocyprella sp. 外视,左瓣,登记号S15JL62-31;23—Candonagyrongensis外视,左瓣,登记号S15JL62-2;24—C. subxizangensis外视,右瓣,登记号S15JL61-1-021

  • 1~24—all ostracoda fossils were collected from the Duojidong Miocene-Pliocene section in the Zanda basin, the white bars are all100 μm; 1—the exterior of Ilyocyprisxizangensis, right valve, No.S15JL24-1; 2—the exterior of I. xizangensis, right valve, No.S15JL62-9; 3—the exterior of I. xizangensis, right valve, No.S15JL83-14; 4— the exterior of I. bradyi, left valve, No.S15JL26-1; 5—the exterior of I. peudobradyi, right valve, No.S15JL69-1; 6—the exterior of I. peudobradyi, right valve, No.S15JL69-4; 7—the exterior of Ilyocypris sp., left valve, No.S15JL126-4; 8—the exterior of Ilyocypris sp., left valve, No.S15JL133-1; 9—the exterior of I. gibba, left valve, No.S15JL133-15; 10—the exterior of I. subdushanensis, left valve, No.S15JL141-9; 11—the exterior of I. subdushanensis, left valve, No.S15JL137-2; 12—the exterior of I. subdushanensis, left valve, No.S15JL119-5; 13—the exterior of Cyclocyprisorum, left valve, No.S15JL29-4; 14—the exterior of Cypridopsisparaovata, left valve, No.S15JL62-17; 15—the exterior of Cyclocypris sp., left valve, No.S15JL59-6; 16—the exterior of Pseudocandonacompressa, right valve, No.S15JL87-4; 17—the exterior of Eucypriszandanensis, left valve, No.S15JL61-3; 18—the exterior of Eucypris sp., right valve, No.S15JL62-21; 19—the exterior of Eucypris sp., left valve, No.S15JL83-8; 20—the exterior of E. concinnaqaidamensi, right valve, No.S15JL62-14; 21—the exterior of Eucypris sp., right valve, No.S15JL83-19; 22—the exterior of Herpetocyprella sp., left valve, No.S15JL62-31; 23—the exterior of Candonagyrongensi, left valve, No.S15JL62-2; 24—the exterior of C. subxizangensis, exterior, right valve, No. S15JL61-1-021

  • 图4 西藏札达盆地多几东沟剖面典型介形类化石2

  • Fig.4 Selected ostracod species from the Duojidong section in the Zanda basin, Tibet, Part 2

  • 1~24—介形类化石均采自札达盆地多几东沟中新世-更新世剖面,白色线段代表100 μm;1—Candonahimalayaensis外视,右瓣,登记号S15JL98-6;2—C. himalayaensis外视,右瓣,登记号S15JL29-5;3—C. himalayaensis外视,右瓣,登记号S15JL62-28;4—C. himalayaensis外视,右瓣,登记号S15JL62-19;5—C. gyrongensis外视,右瓣,登记号S15JL113-9;6—C. gyrongensis外视,右瓣,登记号S15JL62-20;7—C. subxizangensis外视,右瓣,登记号S15JL61-19;8—Leucocythere sp. 外视,左瓣,登记号S15JL133-2;9—Leucocythere sp. 外视,左瓣,登记号S15JL145-19;10—L. burangensis外视,左瓣,登记号S15JL29-5;11—L. mirabilis外视,右瓣,登记号S15JL133-8;12—L. mirabilis外视,右瓣,登记号S15JL137-8;13—L. tropis外视,左瓣,登记号S15JL87-10;14—L. parasculpta外视,右瓣,登记号S15JL61-26;15—L. dorsotuberosa外视,右瓣,登记号S15JL74-8;16—Leucocythere sp. 外视,右瓣,登记号S15JL78-7;17—Candoniellazadaensis外视,左瓣,登记号S15JL126-3;18—C. zadaensis外视,右瓣,登记号S15JL52-1;19—Leucocytherella sinensis外视,右瓣,登记号S15JL109-5;20—L. sinensis外视,右瓣,登记号S15JL76-6;21—L. trinoda外视,右瓣,登记号S15JL116-1;22—L. trinoda外视,右瓣,登记号S15JL87-1;23—L. hyalina外视,右瓣,登记号S15JL119-3;24—L. hyalina外视,左瓣,登记号S15JL119-4

  • 1~24—all ostracoda fossils were collected from the Duojidong Miocene-Pliocene section in the Zanda basin, the white bars are all100 μm; 1—the exterior of Candonahimalayaensis, right valve, No.S15JL98-6, 2—the exterior of C. himalayaensis, right valve, No.S15JL29-5; 3—the exterior of C. himalayaensis, right valve, No.S15JL62-28; 4—the exterior of C. himalayaensis, right valve, No.S15JL62-19; 5—the exterior of C. gyrongensis, right valve, No.S15JL113-9; 6—the exterior of C. gyrongensis, right valve, No.S15JL62-20; 7—the exterior of C. subxizangensis, right valve, No.S15JL61-19; 8—the exterior of Leucocythere sp., left valve, No.S15JL133-2; 9—the exterior of Leucocythere sp., left valve, No.S15JL145-19; 10—the exterior of Leucocythereburangensis, left valve, No.S15JL29-5; 11—the exterior of Leucocythere mirabilis, right valve, No.S15JL133-8; 12—the exterior ofLeucocythere mirabilis, right valve, No.S15JL137-8; 13—the exterior of Leucocytheretropis, left valve, No.S15JL87-10; 14—the exterior of Leucocythereparasculpta, right valve, No.S15JL61-26; 15—the exterior of Leucocytheredorsotuberosa, right valve, No.S15JL74-8; 16—the exterior of Leucocythere sp., right valve, No.S15JL78-7; 17—the exterior of Candoniellazadaensis, left valve, No.S15JL126-3; 18—the exterior of C. zadaensis, right valve, No.S15JL52-1; 19—the exterior of Leucocytherella sinensis, left valve, No.S15JL82-2; 20—the exterior of L. sinensis, right valve, No.S15JL76-6; 21—the exterior of L. trinoda, right valve, No.S15JL116-1; 22—the exterior of L. trinoda, right valve, No.S15JL87-1; 23—the exterior of L. hyalina, right valve, No.S15JL119-3; 24—the exterior of L. hyalina, left valve, No.S15JL119-4

  • 3.2 Leucocytherella-Candoniellazadaensis-Leucocytheremirabilis组合带

  • 该带分布于剖面74~145层,主要分子为 Leucocytherella sinensis,L.trinodaL.hyalineLeucocythere sp.,L.burangensisL.mirabilisL.subsculptaL.exilitropisL.tropisCandonacompressaCandoniellazadaensisEucypris sp.其次为 IlycocyprisxizangensisI.dushanensisI.subdushanensisI.sp.,C.xizangensisHerpetocyprella sp. 本组合带中L.sinensisL.trinodaL.hyalina的数量极其丰富。

  • 4 介形类化石组合带与邻区对比及时代讨论

  • 本次在札达盆地托林组中所建的两个介形类组合带可以与国内外其他地区相同层位的地层单元内的介形类组合进行对比(表1)。

  • Ilycocyprisbradyi-Cyclocyprisorum-Leucocytheredorsotuberosa组合带中的主要分子Ilycocyprisbradyi 产于柴达木盆地上新统狮子沟组中(青海石油管理局勘探开发研究院和中国科学院南京地质古生物研究所,1988),组合带中的重要分子Cyclocyprisorum为中新统—下上新统上油沙山组的重要分子(青海石油管理局勘探开发研究院和中国科学院南京地质古生物研究所,1988),组合带中的重要分子I. duschanensis具有重要地层意义,见于我国新疆准噶尔盆地、吐鲁番盆地、华北、黄海、渤海、青海共和盆地以及唐古拉山口等广大地区中—上新世地层中(庞其清,1980)。本组合带中的重要分子Leucocytheredorsotuberosa Huang 见于山西中南部、札达盆地以及共和盆地上新世地层中(黄宝仁,1984朱大岗等,2007b),L.subgongheensis 见于山西中南部及共和盆地上新世地层中(黄宝仁,1984),L.burangensis 见于柴达木盆地及札达盆地中—上新世地层中(青海石油管理局勘探开发研究院和中国科学院南京地质古生物研究所,1988)。L.parasculpta见于柴达木盆地上新世地层中(青海石油管理局勘探开发研究院和中国科学院南京地质古生物研究所,1988)。综上所述,Ilycocyprisbradyi-Cyclocyprisorum-Leucocytheredorsotuberosa组合带中的许多主要分子与外界联系广泛,可与国内外其他地层单元同层位的地层进行较好的对比。

  • Leucocythere mirabilis-Leucocytherella组合带中的主要分子 Leucocytherella 见于吉隆盆地上新统—更新统沃马组中(黄宝仁等,1982陈奋宁等,2010;2013),Candoniellaxizangensis见于吉隆城东磨坊上新统(陈奋宁等,2010;2013;黄宝仁等,1982),Leucocythere mirabilis为分布于欧洲大陆水域的现生种,化石代表见于我国西北地区、唐古拉山口、欧洲、亚洲、美洲、青海柴达木盆地、青海共和盆地及陕西渭河盆地上新世—更新世地层中(李友桂,1966庞其清,1980黄宝仁等,1982黄宝仁,1984)。

  • 表1 西藏札达盆地上中新统—上新统托林组介形类动物群与国内外对比表

  • Table1 Correlation of Upper Miocene-Pliocene ostrocoda fauna from Zanda basin with other areas

  • 综上所述,本文将札达盆地产Ilycocyprisbradyi-Cyclocyprisorum-Leucocytheredorsotuberosa组合带的托林组下部时代置于中新世晚期—上新世早中期,产Leucocythere mirabilis-Leucocytherella 组合带的托林组上部—香孜组底部时代置于上新世晚期—早更新世。故依据介形类组合带时代,并结合古地磁年龄资料札达盆地托林组的时代应置于中新世晚期—上新世最晚期。

  • 5 介形类群落的划分和特征

  • 介形类的生活领域十分广泛,在一切天然水域中都能生存,如淡水、半咸水以及咸水环境,以浅海和湖沼为最多,从数千米深的深海到热泉、沟渠及沼泽等环境均有分布。在湖泊体系中,湖泊的水文状况和水化学条件受气候控制的降水和蒸发变化的影响,介形类对环境,特别是对盐度和温度的变化极其敏感,它们是影响介形类生存的主要因素(Holmes et al.,1998)。因此,介形类可作为古盐度、古温度、古深度及古水位等古水文化学和古水文参数的标志,从而提供重要的环境变化信息。

  • 介形类群落是指根据介形类在纵向剖面上的分布特征、介形类的丰度、分异度等而建立的群落。介形类群落分析可以获取当时的水化学条件及水体的温度、盐度和酸碱度等影响介形类生态特征的环境因素,从而提取重要的环境变化信息。本文根据托林组介形类属种在剖面上的分布规律及生态特征,自下而上建立7个介形类群落(图6)。

  • 5.1 群落1(Candona-Candoniella群落)

  • 该群落分布在剖面1~31层,由CandonaxizangensisC.compressaC.gyirongensisC.himalayaensisC.sp.,C.candidaCandoniellazadaensisCyclocypris ovum,IlycoprisxizangensisI.pentanodaI.Subdushanensis组成。群落优势度(D)为:0.12~0.40,复合分异度(H):0.71~1.17。组合中优势分子为C.xizangensisC.compressaC.CandidaC.sp.及Candoniellazadaensis。群落中化石个体保存完好,几乎全属单瓣壳。该群落埋藏的围岩是灰绿色、蓝灰色细砂岩、中砂岩、粗砂岩、粉砂岩、泥岩夹砂岩和砾岩,为河流相—湖泊三角洲相沉积。

  • 5.2 群落2(Ilycopris-Cyclocypris群落)

  • 该群落分布在剖面32~60层,由IlycoprisxizangensisI.pentanodaI.subdushanensisCyclocypris ovum,CandonaxizangensisCandoniellazadaensis组成。群落优势度(D)为:0.12~0.23,复合分异度(H):0.84~1.59。组合中优势分子为I.xizangensisI.pentanodaI.subdushanensisC.ovum。群落中化石个体保存完好,几乎全属单瓣壳。该群落埋藏的围岩是灰绿色、蓝灰色细砂岩、砂岩、粗砂岩、粉砂岩、泥岩夹砂岩和砾岩,为河流相—湖泊三角洲相沉积。

  • 5.3 群落3(Leucocythere-Candona群落)

  • 该群落分布在剖面61~73层,由Leucocythere sp.,L.dorsotuberosaL.gongheensisL.latizonaL.mirabilisL.exilitropisL.burangensisL.tropisL.nodaL.subscunlptaCandonaxizangensisC.compressaC.zadaensisC.sp.,Cycleocypris ovum,FabeaformiscandonafabeaformisEucypriszandanensisIlycoprisxizangensisI.pentanodaI.subdushanensis组成。群落优势度(D)为:0.10~0.13,复合分异度(H):0.72~2.55。组合中优势分子为LeucocythereCandonaCycleocypris ovum。群落中化石个体保存完好。该群落埋藏的围岩岩性主要为蓝灰、灰白色厚层状石英粗砂岩、长石石英细砂岩、中薄层粉砂岩和粉砂质钙质泥岩,为湖泊三角洲相—湖泊相沉积。

  • 5.4 群落4(Ilycopris-Leucocythere群落)

  • 该群落分布于剖面74~96层,由Ilycopris sp.,I.xizangensisI.dunshanensisI.pseudodunschanensisI.pentanodaI.subdushanensisLeucocytheredorsotuberosaL.gongheensisL.sp.,L.latizonaL.mirabilisL.exilitropisL.burangensisL.tropisL.nodaL.subscunlptaLeucocytherella sinensis,L.trinodaL.hyalinaCandona sp.,C.xizangensisC.compressaC.zadaensisCycleocypris ovumFabeaformiscandonafabeaformis组成。群落优势度(D)为:0.11~0.43,复合分异度(H):0.69~1.29。组合中优势分子为IlycoprisLeucocythere。群落中化石个体保存完好,几乎均属单瓣壳。该群落埋藏的围岩岩性主要为蓝灰、灰白色厚层状石英粗砂岩、长石石英细砂岩、中薄层粉砂岩和粉砂质钙质泥岩为湖泊三角洲相—湖泊相沉积。

  • 图5 西藏札达盆地托林组主要介形类化石逐点分布

  • Fig.5 Distribution of dominating ostracoda from the Tuolin Formation in the Zanda basin, Tibet

  • 图6 西藏札达盆地多几东沟托林组介形类含量图

  • Fig.6 Percentage chart of ostracoda from the Tuolin Formation in the Zanda basin, Tibet

  • 5.5 群落5(Leucocythere-Leucocytherella-Candona群落)

  • 该群落分布于剖面97~120层,由Leucocythere sp.,L.mirabilisL.nodaL.exilitropisL.burangensisL.tropisL.nodaL.subscunlptaCycleocypris ovum,Fabea formiscandonafabeaformisLeucocytherella sinensis,L.trinodaL.hyalinaCandona sp.,C.compressaCandoniellazadaensisI.xizangensis组成。群落优势度(D)为:0.14~0.49,复合分异度(H):0.41~0.83。组合中优势分子L.mirabilisL.sinensisL.trinodaL.hyalinaC.xizangensisC.compressaCandona sp.及C.zadaensis群落中化石个体保存完好,几乎均属单瓣壳。该群落埋藏的围岩岩性主要为蓝灰、灰白色中薄层粉砂岩和粉砂质钙质泥岩,为湖泊相沉积。

  • 5.6 群落6(Leucocythere mirabilis-Candona群落)

  • 该群落分布于剖面121~132层,由Leucocythere mirabilis,CandonaxizangensisC.compressaC.sp.及Candoniellazadaensis组成。群落优势度(D)为:0.11~0.30,复合分异度(H):0.85~1.61。组合中优势分子为L.mirabilisCandona群落中化石个体保存完好,几乎均属单瓣壳。该群落埋藏的围岩岩性主要为蓝灰、灰白色中薄层粉砂岩和粉砂质钙质泥岩,为湖泊相沉积。

  • 5.7 群落7(Ilypris-Leucocytherella群落)

  • 该群落分布于剖面133~145层,由Ilycoprissp.,I.xizangensisI.dunshanensisI.pseudodunschanensisI.pentanodaI.SubdushanensisCycleocypris ovum,Leucocythere sinensis,L.trinodaL.hyalinaLeucocythere mirabilis,Leucocytheresp.,L.nodaL.exilitropisL.burangensisL.tropisL.nodaL.subscunlptaCandonacompressaC.sp.,Candoniellazadaensis及组成。群落优势度(D)为:0.32~0.78,复合分异度(H):0.09~0.57。组合中优势分子Ilycoprissp.,I.xizangensisI.dunshanensisI.pseudodunschanensisI.pentanodaI.subdushanensisL.sinensisL.trinodaL.hyalina群落中化石个体保存完好,几乎均属单瓣壳。该群落埋藏的围岩为灰色巨厚层状复成分砾岩,灰褐色中层状含砾石英中砂岩夹薄层状中—细粒石英砂岩,蓝灰、土黄色薄层—极薄层泥质粉砂岩。为扇三角洲—冲积扇相沉积。

  • 6 札达盆地古气候演化

  • 不同介形类群落都有其最适宜的生活环境,因此根据介形类群落特征的变化、时空分布,结合地层的沉积特征,将札达盆地9.5~1.7 Ma时段的古气候划分为6个期次。

  • 6.1 凉湿期(9.5~8.4 Ma)

  • 大致相当于介形类群落1。组合中的优势分子Candona是厌热性介形类,多数种适于生活在10℃以下水体中(庞其清,1985),Candona又是淡水属,主要生活在各种类型的淡水中。Candona在我国柴达木盆地淡水—少盐水(0.5‰~5‰)水域分布广,数量多,可指示水体淡化。Candona在地层中主要产于灰绿、棕红色泥质岩和含盐量低的碳酸钙胶结的砂岩中(青海石油管理局勘探开发研究院和中国科学院南京地质古生物研究所,1988彭金兰,1997)。C.xizangensis与欧洲狭温种C.neglecta十分相近,在藏南淡水湖泊深水区分布广(黄宝仁等,1982Wrozyna et al.,2009),这两个种均为较冷的介形类,它们与西藏佩枯错三级阶地紧密共生,在12600~10600 a B.P.,冷湿期数量较大(彭金兰,1997)。C.gyirongensis还是西藏班戈错末次冰期介形类组合中的主要分子(李元芳等,199120012002),在札达盆地9.5~6.3 Ma期间,80%的分析样品均含C.xizangensisC.gyirongensis,且数量多、丰度值高。优势分子 Cyclocypris ovum是喜淡水—微咸水分子(韩春梅等,2022),C.ovum是青藏高原淡水湖泊中的常见属种,在祁连山乱海子淡水湖中很丰富(Graf,1938;Mezquita et al.,1999;Meisch,2000Mischke et al.,2003)。由此推测,9.5~8.4 Ma,这个时期札达盆地比较凉爽潮湿。

  • 6.2 温湿期(8.4~6.3 Ma)

  • 大致相当于介形类群落2。组合中优势分子Ilycopris是喜暖属(Neale et al.,1988),喜欢10.5~20℃的温度(青海石油管理局勘探开发研究院和中国科学院南京地质古生物研究所,1988)且Ilyocypris是含藻类的流动水的标志,壳体数量较高,可能指示入湖径流增大(Stapin,1963;黄宝仁等,1982;黄宝仁,1985;侯祐堂等,2002)优势分子LeucocythereLeucocytherella为偏淡水至微咸水属(青海石油管理局勘探开发研究院和中国科学院南京地质古生物研究所,1988Tanaka et al.,2009)。群落中优势分子IlyocyprispentanodaI.subdushanensisL.trinoda发育较多瘤刺,杨藩等(2008)认为当盐度降低时,介形类趋向于发育瘤刺,这可能指示当时降水量较充沛,湖水淡化(彭金兰等,1997)。综上所述,8.4~6.3 Ma札达盆地介形类以喜暖淡水分子为主,生活环境为入湖径流的含藻类流动水体,气候温暖潮湿。由此推断,8.4~6.3 Ma札达盆地气候以温暖潮湿为主,降雨量增加,入湖径流增加,湖水位上升。

  • 6.3 凉湿期(6.3~5.5 Ma)

  • 大致相当于介形类群落3。群落中优势分子Candoniella为喜冷淡水—微咸水型属,喜生活于淡水沼泽、池塘等小型水体中(Ellis et al.,1959~1964,1964~1975),优势分子Leucocytherella为偏冷淡水-微咸水属,优势分子Candona为喜冷淡水-淡水型属。优势分子Leucocythere mirabilis为喜冷狭温属种。Cyclocypris ovum是喜淡水—微咸水分子(韩春梅等,2022),C.ovum是青藏高原淡水湖泊中的常见属种,在祁连山乱海子淡水湖中很丰富(Graf,1938Meisch,2000Mischke et al.,2003)。综上可知,该阶段介形类以喜冷、偏冷淡水-微咸水型属种占主导地位。因此推测该阶段介形类的生活环境为水体较浅的微咸水-淡水湖泊,气候相对凉湿。

  • 6.4 温湿期(5.5~4.4 Ma)

  • 大致相当于介形类群落4。群落中的优势分子Ilycopris数量急剧增加。该优势分子是喜暖属(Neale et al.,1988),喜欢10.5~20℃的温度(青海石油管理局勘探开发研究院和中国科学院南京地质古生物研究所,1988)且Ilyocypris是含藻类的流动水的标志,壳体数量较高,可能指示入湖径流增大(Stapin,1953黄宝仁等,1982黄宝仁,1984侯祐堂等,2002)。优势分子Leucocythere为偏淡水至微咸水属(青海石油管理局勘探开发研究院和中国科学院南京地质古生物研究所,1988Tanaka et al.,2009)。综上所述,该阶段介形类以喜暖、喜淡水—微咸水型属种占主导地位,推测该阶段介形类的生活环境为水体较浅的淡水-微咸水湖泊,气候比较温暖潮湿。

  • 6.5 冷湿期(4.4~2.8 Ma)

  • 大致相当于介形类群落5和6。群落中的优势分子Leucocythere mirabilis为喜冷狭温属种,优势分子Candona为喜冷淡水-淡水型属。综上可知,该阶段介形类以喜冷、偏冷淡水—微咸水型属种占主导地位,因此推测该阶段介形类的生活环境为水体较浅的微咸水-淡水湖泊,气候相对温凉偏湿。

  • 6.6 温暖偏干期(2.8~1.7 Ma)

  • 大致相当于介形类群落7。群落中的优势分子Leucocytherella为偏淡水至微咸水属(青海石油管理局勘探开发研究院等,1988Tanaka et al.,2009)。优势分子Ilycopris是喜暖属(Neale et al.,1988),喜欢10.5~20℃的温度(青海石油管理局勘探开发研究院和中国科学院南京地质古生物研究所,1988)且Ilyocypris是含藻类的流动水的标志,壳体数量较高,可能指示入湖径流增大(Stapin,1953黄宝仁等,1984侯祐堂等,2002)。群落中优势分子LeucocytherellatrinodaIlyocyprispentanodaI.dushanensisI.subdushanensis发育较多瘤刺,杨藩等(2008)认为当盐度降低时,介形类趋向于发育瘤刺,这可能指示当时降水量较充沛,湖水淡化(彭金兰,1997)。主要分子Candona为喜冷淡水—淡水型属。由此可见,该时段介形类以喜淡水—微咸水为主,温暖属种占有一定数量,推测该时段札达盆地为温暖潮湿偏凉气候,相较于之前气温有所回升。

  • 7 讨论

  • 7.1 古气候对比

  • 对比于前人在吉隆和札达一带的古气候研究,王富葆等(1996)在7.0~6.5 Ma建立的孢粉带1以蕨类孢子为主,木本花粉次之,常见松、雪松和铁杉等;孙黎明等(2007)认为6.54 Ma之前气候为暖湿。7 Ma时期的三趾马动物群(黄万波等,1979)和该层位黏土矿物、啮齿类化石(陈万勇等,1977王富葆等,1996Hong Hanlie et al.,2010)等研究认为当时气候是温热潮湿的亚热带环境。吉隆盆地介形类动物群的群落恢复7.2~6.7 Ma为温湿期(陈奋宁等,2013)。脊椎动物牙齿碳同位素(Wang Yang et al.,2006)记录指示出7.0 Ma存在草原或森林草原植被,气候较现在更为温暖。此外,巴基斯坦北部的碳氧同位素资料(Behrensmeyer et al.,2007Quade et al.,1995),记录8.0~7.3 Ma开始出现C4植物。尼泊尔中西部(Ojha et al.,2000)的古地磁和碳同位素资料指示7.65 Ma之后C4植物明显增多。结合本次研究,可以发现在8.4~6.3 Ma藏南喜马拉雅的广大地区古气候为温暖湿润。

  • 之后,藏南一带的植被特征以落叶针叶林为主,优势类型为松、云杉、冷杉和雪松; 草本菊科和藜科的发现指示高寒灌丛草甸的发育;落叶阔叶植物类型有极少量的出现。该阶段气候主体特征为寒冷干旱,但是在5.0 Ma前后有一次落叶阔叶类的复苏,指示温湿气候的波动(Xu Yadong et al.,2012吴旌等,2013)。区域资料中,王富葆等(1996)在6.5~3.4 Ma建立孢粉带2~4个,反映在5.4 Ma,气候从冷干转变为温湿;吉隆盆地介形类动物群(陈奋宁等,2013)反映在5.8~3.6 Ma,气候主要为温暖潮湿,但在起始和后期为凉湿期;吉隆盆地黏土矿物(Hong Hanlie et al.,2010)的古气候变化的代用指标指示在5.8~5.5 Ma相对冷干,而在5.5~2.5 Ma又恢复到温暖湿润。此外,黄土高原(Wu Naiqin et al.,2006Passey et al.,2009)软体动物蜗牛反映5.1~4.0 Ma盛行温湿的夏季风,在4.0 Ma开始大量出现C4植物类型(Ding Zhongli et al.,2000);天山地区独山子剖面(Sun Jimin et al.,2007)孢粉研究认为5.8~3.9 Ma存在一次温湿的气候阶段。区域对比反映出藏南地区在约6.3~3.6 Ma气候以比较寒冷潮湿为主,期间在5.5~4.4 Ma期间存在一次温湿气候阶段。

  • 王富葆等(1996)在3.4~1.7 Ma建立孢粉带5~6,反映出干旱化加强的趋势;孙黎明等(2007)在3.29~1.7 Ma建立的孢粉带5~6,指示气候从温湿趋于冷干;而且气候在3.6 Ma后持续向冷干转变;而吉隆盆地黏土矿物(Hong Hanlie et al.,2010)的指标反映出在2.5~1.7 Ma气候却变得更为温暖。吉隆盆地介形类动物群(陈奋宁等,2013)反映3.3~1.67 Ma吉隆盆地气候寒冷干燥。此外,北太平洋粉尘通量(Rea et al.,1998)在3.6~2.6 Ma持续增加,记录了东亚季风的加强(An Zhisheng et al.,2001),而2.6 Ma之后东亚冬季风的持续强化和气候的波动变化使得中国西北部的干旱化加强(An Zhisheng et al.,2001)。多项资料的结论是一致的,均指示该时间段内藏南气候为凉湿—冷干期的多次波动变化。结合本次研究,可以发现在3.6~1.7 Ma藏南喜马拉雅的广大地区古气候为持续向冷干转变,在2.8~1.7 Ma气候却变得温暖潮湿。

  • 7.2 古气候成因

  • 基于上述古气候变化的分析和对比,我们进而可以推测研究区的环境变化成因。其中,在9.71~9.44 Ma全球大洋氧同位素值(Miller et al.,1991Billups et al.,2002)记录了δ18O值的增加,建立Mi6带(9.6 Ma),同期西太平洋δ13C值负偏移(Zhao Quanhong et al.,2001),结合阿拉伯海ODP Site722浮游有孔虫(Kroon et al.,1991)记录的印度洋上升流加强可以推断南亚季风起源(或显著加强),并在约8.3 Ma达到峰值。同期,吉隆和札达地区在伸展构造的背景下裂陷成盆,在印度季风的影响下气候为温暖湿润,并在7.0 Ma之前C4植被已开始出现(Quade et al.,1995Wang Yang et al.,2006Behrensmeyer et al.,2007)。我们认为7.0 Ma前后西藏南部地区的气候比较适宜,生存有C4植物类型。之后,在全球冰量持续增加的情况下,全球气候持续变冷(Wu Naiqin et al.,2006Passey et al.,2009),到约6.5 Ma南极西部的冰盖形成(Zachos et al.,2001),5.96~5.33 Ma发生了地中海盐度危机事件(Rouchy et al.,1992Krijgsman et al.,1999Duggen et al.,2003)。然而,在全球气候恶化的背景下,5.0~4.3 Ma的一次温湿气候(Vandenberghe et al.,2004;Sun jimin et al.,2007;Li Fengjiang et al.,2008Passey et al.,2009)的波动在青藏高原周缘的几个气候敏感区均有响应,北太平洋粉尘通量(Rea et al.,1998)在此阶段几乎降低到零,反映一次东亚冬季风的减弱(或夏季风的加强)。在此阶段,藏南喜马拉雅地区的气候主要受控于全球气候事件的影响,而且三趾马动物群也在此时期迁徙到札达盆地。

  • 北太平洋粉尘通量(Rea et al.,1998)在约3.6 Ma之后开始急剧增大,而在2.7 Ma发生一次突降。南中国海的氧同位素(Tian Jun et al.,2004)记录3.3~2.5 Ma东亚季风和北半球冰期同步增强,2.5 Ma之后反映北半球大陆冰盖扩展和萎缩的波动变化。深海碳氧同位素(Shackleton et al.,1984; Billups et al.,2002)记录了北半球冰期在2.7 Ma开始发育,进一步形成两极冰盖(Zachos et al.,2001)。全球不同地区的沉积速率(Zhang Peizhen et al.,2001)在4.0~2.0 Ma急剧增大,指示全球尺度的气候变化对区域环境的深远影响;吉隆和札达地区在全球气候趋于干冷的背景下也变得寒冷干旱。此外,3.6 Ma以来高原周缘压陷盆地和高原内部大型湖泊解体消亡,而高原周缘山麓冲洪积扇巨砾岩堆积与下伏地层呈不整合接触(施雅风等,1998;李吉均等,1998Zhang Kexin et al.,2008;2010),指示出高原整体隆升事件(即青藏运动A幕和B幕(施雅风等,1998;李吉均等,19982001));相关的构造事件在札达盆地的沉积记录中也得到响应,故而藏南气候受全球气候和高原隆升事件的双重影响。

  • 8 结论

  • 通过对藏南札达盆地多几东沟中新世中期—早更新世地层剖面中介形类动物群的研究,得出以下几点认识:

  • (1)建立了两个介形类组合带:①Ilycocyprisbradyi-Cyclocyprisorum-Leucocytheredorsotuberosa组合带;②Leucocytherella-Candoniellazadaensis-Leucocytheremirabilis 组合带。依据介形类组合带,结合古地磁资料将札达盆地托林组的时代置于中新世晚期—上新世最晚期。

  • (2)根据介形类动物群在剖面上的分布规律,对其进行群落划分,共划分7个群落:Candona-Candoniella群落,Ilycopris-Cyclocypris群落,Leucocythere-Candona群落,Ilycopris-Leucocythere群落,Leucocythere-Leucocytherella-Candona群落,Leucocythere mirabilis-Candona群落和Ilypris-Leucocytherella群落。

  • (3)通过对所建介形类群落进行详细的生态特征分析,将札达盆地中新世晚期—早更新世的古气候划分为6个期次:①9.5~8.4 Ma为凉湿期;②8.4~6.3 Ma为温湿期;③6.3~5.5 Ma为凉湿期;④5.5~4.4 Ma为温湿期;⑤4.4~2.8 Ma为冷湿期;⑥2.8~1.7 Ma为温暖偏干期。

  • (4)将研究区9.5 Ma以来的气候演化特征与全球气候演变对比认为:札达盆地9.5~6.3 Ma间的气候以暖湿为主,可能与来自印度的东南季风加强有关;6.3~3.6 Ma间札达盆地古气候分析显示为相对暖湿期,存在气候波动,可能与来自印度洋的东南季风再次加强有关;3.6 Ma以后由于受全球气候变冷、冬季风加强及青藏高原强烈隆升的影响,札达盆地气候向寒冷干旱的环境转变,在2.8~1.7 Ma气候却变得温暖潮湿。

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