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首页> 外文期刊>Geochemistry, geophysics, geosystems >Miocene climate change on the Chinese Loess Plateau: Possible links to the growth of the northern Tibetan Plateau and global cooling
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Miocene climate change on the Chinese Loess Plateau: Possible links to the growth of the northern Tibetan Plateau and global cooling

机译：黄土高原中新世气候变化：与青藏高原北部增长和全球降温的可能联系

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The evolution of the Asian monsoon-arid environmental system during the Cenozoic was closely related to the growth of the Himalayan-Tibetan Plateau and global climate change. However, due to inconsistencies in paleoclimatic reconstructions and to various constraints on the timing of the growth of the Tibetan Plateau, the relative impacts of regional uplift and global cooling on Asian climate change remain controversial. Here we investigate the mineralogical composition of a Miocene Red Clay deposit on the western Chinese Loess Plateau in order to infer changes in chemical weathering and monsoon intensity. Variations of four mineralogical ratios (chlorite/quartz, illite/quartz, calcite/quartz, and protodolomite/quartz) reveal that the summer monsoon intensity was relatively strong during the early Miocene (23.5-18.5 Ma), weakened gradually until approximate to 9.5 Ma, and strengthened again in the late Miocene. We synthesized previously published thermochronological data from the northeastern Tibetan Plateau and surrounding mountains, and the results suggest that two phases of the rapid growth of northern Tibet occurred around 24-17 and 13-7 Ma. Comparison of paleoclimatic proxies and thermochronological data suggests that the gradual weakening of the summer monsoon intensity from 18.5 to 9.5 Ma paralleled global cooling, whereas two intervals of strengthened monsoon in the early and late Miocene were possibly related to the rapid growth of northern Tibet. Our combination of paleoenvironmental proxies and thermochronological data reveals possible links between Miocene Asian monsoon evolution, phased growth of the Tibetan Plateau, and global climate change, and confirms the interconnection of geodynamic and atmospheric processes in the geological past.
机译：新生代期间亚洲季风-干旱环境系统的演变与喜马拉雅-西藏高原的增长和全球气候变化密切相关。然而，由于古气候重建的不一致以及对青藏高原生长时间的种种限制，区域隆升和全球降温对亚洲气候变化的相对影响仍然存在争议。在这里，我们调查中国西部黄土高原中新世红粘土矿床的矿物学组成，以推断化学风化和季风强度的变化。四种矿物学比率的变化（亚氯酸盐/石英，伊利石/石英，方解石/石英和原生白云石/石英）表明，在中新世早期（23.5-18.5 Ma），夏季季风强度相对较强，逐渐减弱直到大约9.5 Ma ，并在中新世晚期再次加强。我们综合了以前发表的来自青藏高原东北部和周围山脉的热年代学数据，结果表明藏北快速增长的两个阶段发生在24-17和13-7 Ma左右。古气候代理和热年代学资料的比较表明，夏季风强度从18.5Ma逐渐减弱到9.5Ma与全球变冷平行，而中新世早期和中晚期的两次季风增强间隔可能与西藏北部的快速增长有关。我们将古环境代理与热年代学数据相结合，揭示了中新世亚洲季风演化，青藏高原的分阶段生长与全球气候变化之间的可能联系，并确认了地质过去的地球动力学和大气过程之间的相互联系。

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