Sourcing of the Oligocene to Pliocene sediments of the Ningnan Basin: Evidence for Tibetan Plateau growth and local faulting unravelled by detrital apatite fission-track and U–Pb double dating

IF 2.8 2区 地球科学 Q2 GEOSCIENCES, MULTIDISCIPLINARY Basin Research Pub Date : 2024-11-06 DOI:10.1111/bre.70004
Xiaoqin Jiao, Massimiliano Zattin, Valerio Olivetti, Jianqiang Wang, Heng Peng, Silvia Cattò, David Chew
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Abstract

The Cenozoic topographic growth of the Tibetan Plateau is a pulsed, polyphase process that still requires more constraints. The Cenozoic sedimentary record of the Ningnan Basin, a continental basin located adjacent to the northeastern margin of the Tibetan Plateau, is a key archive for recording the surface evolution of the Tibetan Plateau. This work reports new provenance data (apatite fission-track, apatite U–Pb dating, and trace element analysis on the same individual grains) from the Oligocene–Pliocene sedimentary sequence that filled the Ningnan Basin. The data set shows variations in provenance patterns through the Miocene which are related to the tectonic evolution of the northeastern margin of the Tibetan Plateau. In contrast to a primary provenance from the Western Ordos Block (WOB) during the Oligocene, the Miocene sediments were mostly derived from the recycling of Mesozoic successions that occur along the northwestern Haiyuan Fault, documenting it was active in the last ca. 15 Myr. These sediments, in turn, were derived from different orogenic blocks but mainly from different segments of the Qilian Mountains. We show that the Late Miocene–Pliocene sediments were primarily derived from transpressional uplift along the Haiyuan Fault, which affected regions such as the Liupan Mountains. Progressive northeastward migration of tectonic stress since the Middle Miocene has induced extensive regional deformation in the northeastern Tibetan Plateau, particularly along the Haiyuan Fault. The provenance record of the neighbouring Cenozoic basins is a key archive for deciphering this tectonic evolution.

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宁南盆地渐新世至上新世沉积物的来源:通过非晶磷灰石裂变轨迹和铀-铅双重测年揭示青藏高原生长和局部断层的证据
青藏高原新生代地形演化是一个脉冲式、多阶段的过程,仍然需要更多的约束条件。毗邻青藏高原东北缘的大陆盆地--宁南盆地的新生代沉积记录是记录青藏高原地表演化的重要档案。这项工作报告了充填宁南盆地的渐新世-更新世沉积序列的新出处数据(磷灰石裂变轨迹、磷灰石U-Pb定年以及对相同单个颗粒的微量元素分析)。该数据集显示了中新世时期的产状变化,这与青藏高原东北缘的构造演化有关。中新世的沉积物主要来自海原断裂西北部中生代接替的再循环,这与渐新世时来自鄂尔多斯西断块(WOB)的主要产状形成鲜明对比。15 Myr。这些沉积物又来自不同的造山块体,但主要来自祁连山的不同地段。我们的研究表明,晚中新世-更新世沉积物主要来自海原断裂的换位隆起,影响了六盘山等地区。自中新世以来,构造应力逐渐向东北迁移,导致青藏高原东北部,尤其是海源断裂沿线地区发生了广泛的区域变形。邻近新生代盆地的出露记录是解读这一构造演化的关键档案。
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来源期刊
Basin Research
Basin Research 地学-地球科学综合
CiteScore
7.00
自引率
9.40%
发文量
88
审稿时长
>12 weeks
期刊介绍: Basin Research is an international journal which aims to publish original, high impact research papers on sedimentary basin systems. We view integrated, interdisciplinary research as being essential for the advancement of the subject area; therefore, we do not seek manuscripts focused purely on sedimentology, structural geology, or geophysics that have a natural home in specialist journals. Rather, we seek manuscripts that treat sedimentary basins as multi-component systems that require a multi-faceted approach to advance our understanding of their development. During deposition and subsidence we are concerned with large-scale geodynamic processes, heat flow, fluid flow, strain distribution, seismic and sequence stratigraphy, modelling, burial and inversion histories. In addition, we view the development of the source area, in terms of drainage networks, climate, erosion, denudation and sediment routing systems as vital to sedimentary basin systems. The underpinning requirement is that a contribution should be of interest to earth scientists of more than one discipline.
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