Pulsed rise and growth of the Tibetan Plateau to its northern margin since ca. 30 Ma.
Pulsed rise and growth of the Tibetan Plateau to its northern margin since ca. 30 Ma.
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大约自公元 1000 年以来，青藏高原向其北缘呈脉冲式上升和增长。
DOI：
10.1073/pnas.2120364119
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发表时间：
2022-02-22
影响因子：
11.1
通讯作者：
Zhang H
中科院分区：
文献类型：
--
作者：
Wang W;Zhang P;Garzione CN;Liu C;Zhang Z;Pang J;Wang Y;Zheng D;Zheng W;Zhang H
青藏高原东北部柴达木盆地的形成，标志着新生代以来从印亚碰撞带向青藏高原北缘的地壳变形开始。本文介绍了受磷灰石裂变径迹年龄制约的磁性地层学，记录了柴达木盆地大约30 Ma的形成，比以前估计的65~50 Ma要年轻得多。根据年代学，柴达木盆地物源分析揭示了青藏高原东北缘的脉冲形变，首先开始于约30 Ma，随后约10 Ma，时间表明与青藏高原不同部分之下的地幔岩石圈的剥离密切相关。青藏高原边缘造山的开始对欧亚大陆高地貌的形成过程提供了关键的制约因素。尽管增厚地壳的逐步扩张是大多数模式的基础，但一些研究表明，高原北部是在印度和欧亚大陆在大约50 Ma的碰撞后不久建立的。这一推断在很大程度上依赖于柴达木盆地新生代沉积物的年龄和物源。在这里，我们在北部高原提出了柴达木盆地相当年轻的开始和演化的证据，基于磁性地层学和碎屑磷灰石裂变径迹年龄，盆地充填时间约为30-4.8 Ma。碎屑锆石源区分析结合古水流分析表明，青藏高原东北缘祁连山的两期生长分别始于约30 Ma和10 Ma。青藏高原及其边缘约30 Ma和10~15 Ma的大范围同步变形的证据表明，这两个向外生长阶段可能是青藏高原不同部分之下的地幔岩石圈移位的结果。
The formation of the Qaidam basin in the northeastern Tibet marked the onset of crustal deformation that propagated from the Indo-Asia collision zone to the northern margins of the Tibetan Plateau during the Cenozoic time. This paper presents magnetostratigraphies constrained by apatite fission-track ages that document the formation of the Qaidam basin at ca. 30 Ma, much younger than previous estimates of 65 to 50 Ma. Armed with chronology, the Qaidam basin–provenance analyses reveal pulsed deformation of the northeastern margin of the Tibetan Plateau beginning first at ca. 30 Ma and subsequently at ca. 10 Ma, timing suggesting close links to the removal of the mantle lithosphere beneath different portions of the Tibetan Plateau. The onset of mountain building along margins of the Tibetan Plateau provides a key constraint on the processes by which the high topography in Eurasia formed. Although progressive expansion of thickened crust underpins most models, several studies suggest that the northern extent of the plateau was established early, soon after the collision between India and Eurasia at ca. 50 Ma. This inference relies heavily on the age and provenance of Cenozoic sediments preserved in the Qaidam basin. Here, we present evidence in the northern plateau for a considerably younger inception and evolution of the Qaidam basin, based on magnetostratigraphies combined with detrital apatite fission-track ages that date the basin fills to be from ca. 30 to 4.8 Ma. Detrital zircon-provenance analyses coupled with paleocurrents reveal that two-stage growth of the Qilian Shan in the northeastern margin of the Tibetan Plateau began at ca. 30 and at 10 Ma, respectively. Evidence for ca. 30 and 10 to 15 Ma widespread synchronous deformation throughout the Tibetan Plateau and its margins suggests that these two stages of outward growth may have resulted from the removal of mantle lithosphere beneath different portions of the Tibetan Plateau.
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影响因子：
5.3
作者：
Chang, Hong;Li, Leyi;An, Zhisheng
通讯作者：
An, Zhisheng
影响因子：
5.3
作者：
Clark, Marin K.;Farley, Kenneth A.;Duvall, Alison R.
通讯作者：
Duvall, Alison R.
影响因子：
13.6
作者：
Fang X;Dupont-Nivet G;Wang C;Song C;Meng Q;Zhang W;Nie J;Zhang T;Mao Z;Chen Y
通讯作者：
Chen Y
影响因子：
2.4
作者：
Bush, Meredith A.;Saylor, Joel E.;Nie, Junsheng
通讯作者：
Nie, Junsheng
影响因子：
5.2
作者：
Li, Chaopeng;Zheng, Dewen;Li, Youjuan
通讯作者：
Li, Youjuan