| 青藏高原东缘地区隆升作用特征－低温年代学证据 |
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| 引用本文： | 邓宾,刘树根,李智武,刘顺.青藏高原东缘地区隆升作用特征－低温年代学证据[J].第四纪研究,2009,29(3):574-585. |
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| 作者姓名： | 邓宾 刘树根 李智武 刘顺 |
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| 作者单位： | 成都理工大学"油气藏地质及开发工程"国家重点实验室,成都,610059 |
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| 基金项目： | 国家自然科学基金，中国石油化上股份有限公司联合基金 |
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| 摘 要： | 通过对比研究青藏高原东缘若尔盖－泸定地区低温年代学样品(ZFT样31件、AFT样56件和 A(UTh)/He 样37件)各参数(隆升年龄和隆升速率)特征表明，该地区中生代以来的抬升冷却过程具由北向南的递进隆升特征，南部丹巴弧形带与北部茂县弧形带产生了显著的隆升剥露“翘掀式”调整，北部弧形带隆升剥露较早、速率先快后慢，南部弧形带隆升剥露较晚、速率先慢后快； 且在早中新世研究区处于平静期，抬升剥露作用显著减缓。年龄及抬升冷却速率等值线垂向上浅部(70℃等温面)较深部(110℃等温面)弧形展布特征显著； 平面上总体向南具连续弧形变化趋势(年龄变新、隆升速率增大)。抬升冷却(剥露)特征显示出中央造山带和青藏高原的形成对该地区隆升过程的强烈影响，以及弧形构造格架对浅部地表抬升剥露的显著控制作用。
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| 关 键 词： | 低温年代学 隆升作用 弧形格局 青藏高原东缘 |
UPLIFTING CHARACTERISTICS IN EASTERN MARGIN AREA OF TIBETAN PLATEAU: EVIDENCE FROM LOWTEMPERATURE THERMOCHRONOLOGY |
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| Deng Bin,Liu Shugen,Li Zhiwu,Liu Shun.UPLIFTING CHARACTERISTICS IN EASTERN MARGIN AREA OF TIBETAN PLATEAU: EVIDENCE FROM LOWTEMPERATURE THERMOCHRONOLOGY[J].Quaternary Sciences,2009,29(3):574-585. |
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| Authors: | Deng Bin Liu Shugen Li Zhiwu Liu Shun |
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| Institution: | State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation|Chengdu 610059 |
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| Abstract: | The uplift or denudation is shown as a progressive process from north to south in the eastern margin area of the Tibetan Plateau during the MesoCenozoic by the lowtemperature thermochronological data(31 ZFT samples,56 AFT samples and 37 A(UTh)/He samples). The uplift rates are remarkably different between the Danba Arc Belt and the Maowen Arc Belt. The Maowen Arc Belt was uplifted earlier than the Danba Arc Belt，and its rate of uplift and denudation was firstly high(110Ma)but became lower later(10Ma). The Danba Arc Belt was uplifted later. Its rate of uplift and denudation decreased remarkably in the Early Miocene and kept stable for a period.But it uplifted and denudated much faster after Early Miocene.
It is indicated that the age of uplift(or rate of denudation)gradually became older(or lower)from the South to the North or from SE to NW in the region，which has the typical character of arc framework in shallow layer(70℃ isoclines). Therefore，the process of uplift in the eastern margin area of the Tibetan Plateau is strongly influenced by the formation and evolution of Central Orogenic Belt and Tibetan Plateau，and has been intensively controlled by the arc framework in shallow layer. |
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| Keywords: | low temperature thermochronology progressive uplift arc framework eastern margin of Tibetan Plateau |
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