Regional tectono-sedimentary evolution in the northeastern Beijing Sub-plain: evidence from the Yx02 core chronostratigraphy in the buried Daxing Uplift

IF 1 4区 地球科学 Q4 GEOSCIENCES, MULTIDISCIPLINARY Geosciences Journal Pub Date : 2024-02-08 DOI:10.1007/s12303-023-0039-0
Fubing He, Xiwei Xu, Fang Tian, Zhenhua Liu, Yueze Zhang, Lingyan Bai, Yubin Cui, Kai Wang, Wenzhi Niu, Jingbo Ni, Xiaoyong Liu, Mengmeng Cao
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Abstract

The buried Daxing Uplift connects the Beijing Sag and Dachang Sag, which is the critical tectonic unit for understanding the structural evolution of the Beijing Sub-plain and its linkages to regional tectonics. This study combines paleomagnetic, 26Al-10Be isochron dates and sedimentary analyses from a new borehole (Yx02) in the northeastern Beijing Sub-plain to shed fresh light on regional tectonic processes and the sedimentary history since the Pliocene. The main findings are as follows: (1) the Daxing Uplift had formed three depositional episodes: alluvial-fan, lacustrine-delta, and alluvial-fan sedimentation since the Cenozoic; (2) The borehole records the Brunhes, Gauss normal chron, and the Matuyama, Gilbert reversed chron in the Daxing Uplift, the corresponding depths are 0–148.9 m, 148.9–315.0 m, 315.0–520.5 m and 520.5–650 m; (3) An important tectonic event started in ~4.3 Ma, disintegrated NE-trending basin and range terrain, reactivated the NW-trending Nankou-Sunhe fault, and formed Shunyi fault in Beijing Sub-plain. Sedimentation occurs exclusively in the Beijing Sag and the northeastern Daxing Uplift during ~4.3–1.77 Ma; (4) During ~1.77–1.07 Ma, a transition from an extension to a strike-slip occurred, and is described not only in a progressively higher increase of the overall deposition rate, but also in a decrease of the relative deposition disparity between sags and uplifts. Since then, the Beijing Sub-plain has been shaped, associated with an overall subsidence depression in the Bohai Bay Basin. This work enhances our understanding of the formation and evolution of the Beijing Sub-plain, the division of tectonic episodes, and the initiation time of the latest tectonic movement in the break-up region, North China Craton, since the Neogene.

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北京次平原东北部区域构造沉积演化:来自大兴隆起埋藏区Yx02岩芯年代地层学的证据
被埋藏的大兴隆起连接着北京断陷和大昌断陷,是了解北京次平原构造演化及其与区域构造联系的关键构造单元。本研究结合古地磁、26Al-10Be等时线年代和北京次级平原东北部新钻孔(Yx02)的沉积分析,对区域构造过程和上新世以来的沉积历史进行了新的揭示。主要发现如下(1)大兴隆起自新生代以来形成了冲积-扇状沉积、湖积-三角洲沉积、冲积-扇状沉积三个沉积期;(2)钻孔记录了大兴隆起的Brunhes、Gauss正时和Matuyama、Gilbert逆时,相应深度分别为0-148.9米、148.9-315.0米、315.0-520.5米和520.5-650米;(3) ~4.3 Ma开始的一次重要构造事件,解体了NE向的盆地和山脉地形,重新激活了NW向的南口-顺河断层,并在北京次平原形成顺义断层。在~4.3-1.77Ma期间,沉积只发生在北京下陷和大兴隆起的东北部;(4)在~1.77-1.07Ma期间,发生了从延伸向走向滑动的过渡,不仅表现为总体沉积速率的逐渐增加,而且表现为下陷和隆起之间相对沉积差异的减小。从那时起,北京次平原开始形成,与渤海湾盆地的整体沉降凹陷有关。这项工作加深了我们对北京次平原的形成与演化、构造事件的划分以及新近纪以来华北克拉通断裂带最近一次构造运动的起始时间的认识。
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来源期刊
Geosciences Journal
Geosciences Journal 地学-地球科学综合
CiteScore
2.70
自引率
8.30%
发文量
33
审稿时长
6 months
期刊介绍: Geosciences Journal opens a new era for the publication of geoscientific research articles in English, covering geology, geophysics, geochemistry, paleontology, structural geology, mineralogy, petrology, stratigraphy, sedimentology, environmental geology, economic geology, petroleum geology, hydrogeology, remote sensing and planetary geology.
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