Tectonic Uplift and Sedimentary Evolution of the Guide Basin in the Northeast Margin of Tibetan Plateau in Cenozoic Era

SONG Chun hui; FANG Xiao min; GAO Jun ping; SUN Dong; FAN Ma jie

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.

National Laboratory of Western China's Environmental Systems, College of Resource and Environment, Lanzhou University, Lanzhou 730000

Received Date: 2001-04-17

Rev Recd Date: 2001-06-14

Publish Date: 2001-12-10

Key words:

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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Reference (1)

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Tectonic Uplift and Sedimentary Evolution of the Guide Basin in the Northeast Margin of Tibetan Plateau in Cenozoic Era

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