The role of monsoon in the long-term topographic evolution of East Asia (North China)
The role of monsoon in the long-term topographic evolution of East Asia (North China)
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DOI：
10.1016/j.geomorph.2023.108947
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发表时间：
2023-10
期刊：
影响因子：
3.9
通讯作者：
Ruxin Ding;Li Wang;Yuliu Chen;Liu-Zeng Jing;Ke Zhang
中科院分区：
文献类型：
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作者：
Ruxin Ding;Li Wang;Yuliu Chen;Liu-Zeng Jing;Ke Zhang
东亚季风影响着数十亿人的生计，也影响着全球气候变化，但其演变却引发了相当大的争议。吕梁—太行地区地形重建可为东亚季风发展提供宝贵的地形记录。在本研究中，我们利用磷灰石和锆石（Usingle bondTh）/He数据重建了房山-昔阳水平断面的二维（2-D）古地貌以及吕梁-太行地区七个垂直剖面的一维折返演化。二维横断面的西段在 80 Ma 时达到了 3.7 公里的峰值海拔。二维结果显示分水岭移动了 80 Ma。此外，在晚白垩世期间，二维样线西段的地形海拔（和地势）迅速下降。这归因于呼延山断裂活动，可能与晚白垩世鄂霍托莫斯克地块与东亚的碰撞有关。晚渐新世-中中新世期间，二维样线东段也出现了显着的海拔降低和折返加速，这可能与东亚季风的影响有关。结果表明，东亚季风北上进入华北后，吕梁—太行地区可能对阻挡湿暖太平洋空气进入东亚内陆起到了重要作用。
The East Asian monsoon impacts the livelihood of billions of people and also influences global climate change, yet its evolution is associated with considerable controversy. The topographic reconstruction of the Lüliang-Taihang region can provide a valuable topographic record of the East Asian monsoon development. In this study, we employed apatite and zircon (Usingle bondTh)/He data to reconstruct the two-dimensional (2-D) paleotopography of the Fangshan-Xiyang horizontal transect and the one-dimensional exhumation evolution of seven vertical profiles in the Lüliang-Taihang region. The west segment of the 2-D transect reached a peak elevation of ∼3.7 km at ∼80 Ma. The 2-D results revealed that the watershed moved in 80 Ma. Furthermore, a rapid decrease in elevation (and relief) of the topography occurred during the Late Cretaceous in the west segment of the 2-D transect. This was attributed to the Huyanshan Fault activity, which may be related to the collision between the Okhotomorsk Block and East Asia in the Late Cretaceous. There was also a significant elevation reduction and exhumation acceleration for the east segment of the 2-D transect during the Late Oligocene–Middle Miocene, which is probably related to the effects of the East Asian monsoon. The result implies that the Lüliang-Taihang region may have played an important role in blocking humid and warm Pacific air into the interior of East Asia after the East Asian monsoon expanded northwards into North China.