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首页> 外文期刊>Gondwana research: international geoscience journal >Late Oligocene-early Miocene evolution of the Lunpola Basin, central Tibetan Plateau, evidences from successive lacustrine records
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Late Oligocene-early Miocene evolution of the Lunpola Basin, central Tibetan Plateau, evidences from successive lacustrine records

机译：Lunpola盆地，中部藏高高原，连续湖泊记录的证据

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Widespread Cenozoic sediments in and around the Tibetan Plateau (TP) are thought to have played an important role in explaining the process of the India-Asia collision as well as its interactions with global and regional paleoclimate. However, high-resolution temporal frameworks of sedimentary sequences and controls on geological and climatic events are still absent. To study the abovementioned issues, we investigate the Oligocene-Miocene lacustrine sequences (the Dingqinghu Formation) of the Lunpola Basin, central TP. In this work, cyclostratigraphic analyses are conducted with gamma ray log and pollen data to establish a high resolution temporal framework ranging from ca. 25.4 to 18.0 Ma for the sections. Along these sections, sediment accumulation rates are calculated with orbital signals to monitor clastic input of the lake basin; elemental, palynological, and isotopic data are summarized to depict the paleoclimate and paleoelevation evolution of this drainage system. Integrating all these clues together, we sort out a chronological list of events including lake basin, tectonics, and paleoclimate: regional uplift took place at 23.7 Ma; simultaneously, a distinct lake-basin transition characterized by accelerated sediment accumulation rate is recognized; about 0.2 Ma later at 23.5 Ma, catchment scale drought occurred and maintained to the end of the sections. Our results demonstrate that paleoclimate did not impose decisive influence on the late Oligocene-early Miocene evolution of the lake basin; instead, regional uplift and its associated accelerated exhumation of the source area resulted in the lake-basin transition and paleoclimatic drought. After reviewing the Oligocene-Miocene sedimentary records distributed in and around the TP, we argue that the 23.7 Ma geological event of the Lunpola Basin is probably not a single case but a regional effect of a dramatic tectonic transition of the plateau. (C) 2017 International Association for Gondwana Research. Published by Elsevier B.V. All rights reserved.
机译：西藏高原（TP）周围的广泛新生代沉积物被认为在解释印度 - 亚洲碰撞的过程中发挥了重要作用，以及与全球和区域古气候的互动。然而，沉积序列的高分辨率时间框架和地质和气候事件的控制仍然存在。为了研究上述问题，我们研究了Lunpola盆地，中央TP的寡核苷 - 中肾上腺曲子序列（Dingqinghu形成）。在这项工作中，Cyclostraphic分析用伽马射线记录和花粉数据进行，建立高分辨率的时间框架。部分25.4至18.0 mA。沿着这些部分，用轨道信号计算沉积物积累速率，以监测湖泊池的碎片输入;概述了元素，术语和同位素数据，以描绘该排水系统的古古古和古地展现。将所有这些线索整合在一起，我们整理了一系列的活动列表，包括湖泊池，构造和古平息：区域隆起在23.7 mA;同时，识别出具有加速沉积物积累速率的独特湖泊盆地过渡;以后的约0.2 mA在23.5 mA，流域干旱发生并保持在部分末尾。我们的结果表明，古古古强制对湖盆地的晚期寡茂早期进化产生了决定性的影响;相反，区域隆起及其相关的加速挖掘源地区导致湖泊盆地过渡和古叶植物干旱。在审查TP和周围分布的寡核苷类 - 内肾上腺素沉积记录后，我们认为LunPola盆地的23.7 mA地质事件可能不是一个单一的案例，而是对高原的戏剧性化构造过渡的区域影响。 （c）2017年加州研究国际协会。 elsevier b.v出版。保留所有权利。

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