Tectonic Uplift and Sedimentary Evolution of the Guide Basin in the Northeast Margin of Tibetan Plateau in Cenozoic Era
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摘要: 通过对高原东北部贵德盆地新生代地层研究,为恢复高原隆升历史提供依据。贵德盆地形成于渐新世末,其新生代地层可划分出深水砾砂质网状河流、泥石流质网状河流、砾质网状河流、山麓洪积、三角洲、半深湖与浅湖、水下扇三角洲七个沉积相组合体系。根据其沉积相组合和沉积演化揭示出高原隆升过程先后经历了:早期隆升期 (渐新世末 )、较稳定剥蚀夷平期 (早中新世 )、小幅隆升期 (早中新世末 )、稳定剥蚀夷平期 (中中新世至晚中新世 )、持续逐步较快速隆升期 (8.2～ 3.6Ma)、急剧强烈阶段性隆升期 (3.6～ 0Ma) ;其中 3.6Ma±的隆升是新生代构造运动的一个重要分水岭,此前盆地海拔应不超过 10 0 0m,此后构造活动速度明显加速,地形高差显著增大。可见青藏高原的隆升是一个多阶段、不等速和非均变的复杂过程Abstract: There are Iots of different viewpoints about the upIift of the Tibetan PIateau in the worId. The paper provides the proofs for recovering the history of the pIateau upIift by studying Cenozoic stratigraphy of Guide Basin in the northeast Tibetan PIateau. Cenozoic stratigraphy was deposited in Guide Basin wideIy and seven sedimentary facies associations are recognized . They are interpreted as the deposits of deep graveIIy braided, deIta, debris-fIow-dominated braided, shaIIow and haIf-deep Iake, fan deIta, graveIIy braided and piedmont proIuviaI systems, respectiveIy. The reIationship between the sedimentation of Guide basin and the upIift of the Tibetan PIateau reveaIs that the PIateau has experienced six phases in Cenozoic era：preIiminary upIift phase（Late OIigocene）, reIativeIy stabIe and denudation pIanation phase（EarIy-Miocene）, IittIe- scaIe upIift phase（Late EarIy-Miocene）, stabIe and denudation pIanation phase（MiddIe MiddIe-Miocene to Late MiddIe- Miocene）, sustain and stepwise upIift phase（8.2 ~ 3.6 Ma）, rapid and intense upIift phase（3.6 ~ 0 Ma）. The upIift in 3.6 Ma is an important stage of Cenozoic tectonic movements, before then the absoiute eievation of Guide Basin was beiow 1 000 m and since then tectonic movement became more active to form more compiex topography. So the upiift of Tibetan Piateau is a process of muitipie phases, uneguai speed, and irreguiar movement.
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Key words:
- sedimentary facies /
- sedimentary evoiution /
- tectonic upiift /
- Cenozoic /
- Guide Basi
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[1] 1.Coleman M Evidence for Tibetan uplift before 14 Ma ago f rom a new m inimum age for east-west extension[外文期刊] 1995
2.Kroon D;Steens T N F;Troelstra S R Onset of monsoonal related up welling in the western Arabian Sea 1991
3.Harrison T M;Copeland P;Kidd W S F Raising Tibet[外文期刊] 1992(27)
4.李吉均;文世宣;张青松青藏高原隆升的时代、幅度和形式的探讨 1979
5.李吉均;方小敏青藏高原隆升与环境变化研究 1998(15)
6.李吉均;方小敏;马海洲晚新生代黄河上游地貌演化与青藏高原隆起 1996(04)
7.Cochran J R Himalayan uplift sea level and the record of Bengal Fan sedimen tation at the ODP Leg116 site 1990
8.Einsele G;Ratschbacher L;Wetzel A The Himalaya-Bengal fan denuda tion-accumulation system during thepast 20 Ma[外文期刊] 1996
9.Johnson N M;Opdyke N D;Johnson G D Magnetic polarity st ratigraphy and ages of Siwalik Group rocks ofthe Potwar Pakistan 1982
10.Weber M E;Wiedicke M H;Kudrass H R Active growth of the Bengal Fan during sea-level rise and highstand 1997
11.方小敏;李吉均;朱俊杰甘肃临夏盆地新生代地层绝对年代测定与划分 1997(14)
12.谷祖纲;白生海;张显庭青海省贵德、化隆两盆地新第三系的划分与对比 1992(02)
13.郑绍华;吴文裕;李毅青海贵德、共和两盆地晚新生代哺乳动物 1985(02)
14.黄华芳;彭作林;卢伟酒西盆地、酒东盆地第三系磁性地层的划分与对比 1993(01)
15.潘保田贵德盆地地貌演化与黄河上游发育研究 1994(03)
16.Ma Y Z The Quaternary palynflora and palaeoclimate in the Guide and Hualong Basin Qinghai Province China. Global Change and Environmental Evolution in China 1990
17.Miall A D The Geology of Fluvial Deposits Sedimentary Facies Ba sin Analysis and Petroleum Geology 1996
18.Blair T C;Mcpherson J G Alluvial Fans and their natural distinct ion from ri vers based on morphology hydraulic processes sedimentary processes and facies assemblages 1994
19.Nakayama K;Ulak P D Evolution of fluvial style in the Siwalik Group in the foothills of the NepalHimalaya 1999
20.孙秀玉;赵英娘;何卓生青海西宁-民和盆地渐新世至中新世孢粉组合[期刊论文]-地质论评 1984(03)
21.马玉贞;李吉均;方小敏临夏地区30.6～5.0 Ma红层孢粉植物群与气候演化记录 1998(03)
22.Barrett P J;Adams C J;Mcintosh W C Geochronological e v idence supporting Antarctic deglaciation three million years ago 1992
23.宋春晖;方小敏;李吉均青藏高原北缘酒西盆地13Ma以来沉积演化与构造隆升[期刊论文]-中国科学D辑 2001(zk) -
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