Tectonic Uplift and Sedimentary Evolution of the Guide Basin in the Northeast Margin of Tibetan Plateau in Cenozoic Era
Tectonic Uplift and Sedimentary Evolution of the Guide Basin in the Northeast Margin of Tibetan Plateau in Cenozoic Era
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发表时间：
2001
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通讯作者：
Song Chun
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作者：
Song Chun
对于青藏高原的隆升，国际上存在多种不同的观点。本文通过对青藏高原东北部贵德盆地新生代地层的研究，为恢复高原隆升历史提供了依据。贵德盆地新生代地层广泛沉积，识别出7个沉积相组合。它们分别被解释为深部砾石辫状体、三角洲、泥石流主导的辫状体、浅湖和半深湖、扇三角洲、砾石辫状体和山前洪积体系的沉积。贵德盆地沉积与青藏高原隆升的关系表明，青藏高原新生代经历了六个阶段：初步隆升阶段（晚渐新世）、相对稳定剥蚀夷平阶段（早中新世）、小规模隆起阶段（早中新世晚期）、稳定剥蚀夷平阶段（中中新世中期至中中新世晚期）、持续逐步隆升阶段（8.2～3.6）。 Ma），快速强烈隆升阶段（3.6～0 Ma）。 3.6 Ma隆起是新生代构造运动的重要阶段，在此之前贵德盆地的绝对高程在1 000 m以下，此后构造运动更加活跃，形成更加复杂的地貌。因此青藏高原的隆升是一个多阶段、不等速、不规则运动的过程。
There are lots of different viewpoints about the uplift of the Tibetan Plateau in the world. The paper provides the proofs for recovering the history of the plateau uplift by studying Cenozoic stratigraphy of Guide Basin in the northeast Tibetan Plateau. Cenozoic stratigraphy was deposited in Guide Basin widely and seven sedimentary facies associations are recognized. They are interpreted as the deposits of deep gravelly braided, delta, debris flow dominated braided, shallow and half deep lake, fan delta, gravelly braided and piedmont proluvial systems, respectively. The relationship between the sedimentation of Guide basin and the uplift of the Tibetan Plateau reveals that the Plateau has experienced six phases in Cenozoic era: preliminary uplift phase (Late Oligocene), relatively stable and denudation planation phase (Early Miocene), little scale uplift phase (Late Early Miocene), stable and denudation planation phase (Middle Middle Miocene to Late Middle Miocene), sustain and stepwise uplift phase (8.2～3.6 Ma), rapid and intense uplift phase (3.6～0 Ma). The uplift in 3.6 Ma is an important stage of Cenozoic tectonic movements, before then the absolute elevation of Guide Basin was below 1 000 m and since then tectonic movement became more active to form more complex topography . So the uplift of Tibetan Plateau is a process of multiple phases, unequal speed, and irregular movement.