Shuai Li, Zhongpeng Han, Yalin Li, Xiaodong Tan, Alessandro Todrani, Xingduo Ma, Zijian Li, Xinhang Wang, Jie Dai, Chengshan Wang
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引用次数: 0
摘要
西藏早新生代沉积档案对于阐明与大陆碰撞有关的地球动力学过程,特别是地壳变形和缩短至关重要。然而,由于西藏中部新生代沉积盆地缺乏可靠的年代地层框架,阻碍了人们全面了解印度-亚洲连续辐合过程对西藏腹地构造演化的影响。在此,我们报告了出露于西陵峡北岸的牛堡地层新的磁地层年龄和古地磁结果。积极的野外测试和显微观察表明,剩磁是原生的。我们确定测量断面的沉积年龄在 59.2 至 48.6 Ma 之间。我们的研究结果揭示了晚古新世-早始新世时期班公-怒江断裂带的古地理位置为 25.4 ± 2.1°N ,从而支持了印度和亚洲两阶段碰撞的模型。
Magnetostratigraphy of the Niubao Formation in the Bangong-Nujiang Suture Zone: Constraints on the Amount of Crustal Shortening of the Tibetan Plateau Since 60 Ma
The Early Cenozoic sedimentary archives of Tibet are crucial for elucidating the geodynamic processes related to continental collision, particularly crustal deformation and shortening. However, the lack of a reliable chronostratigraphic framework for the Cenozoic sedimentary basins in central Tibet has hindered a comprehensive understanding of the influence of the continuous India-Asia convergence process on the tectonic evolution of the Tibetan hinterland. Here, we report new magnetostratigraphic ages and paleomagnetic results for the Niubao Formation exposed in the northern bank of the Siling Co. Positive field tests and microscopic observations suggest that the remanence is primary. We determine that the depositional age of the measured section was between 59.2 and 48.6 Ma. Our results reveal that the paleogeographic location of the Bangong-Nujiang Suture Zone during the Late Paleocene–Early Eocene was 25.4 ± 2.1°N, thus supporting the model of two-stage collision between India and Asia.
期刊介绍:
Geophysical Research Letters (GRL) publishes high-impact, innovative, and timely research on major scientific advances in all the major geoscience disciplines. Papers are communications-length articles and should have broad and immediate implications in their discipline or across the geosciences. GRLmaintains the fastest turn-around of all high-impact publications in the geosciences and works closely with authors to ensure broad visibility of top papers.