Miocene sequences and depocentres in the Roer Valley Rift System,Basin Research

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Miocene sequences and depocentres in the Roer Valley Rift System
Basin Research ( IF 2.8 ) Pub Date : 2024-07-15 , DOI: 10.1111/bre.12886
Alexandra Siebels _{1,

2} , Johan ten Veen ₂ , Dirk Munsterman ₂ , Jef Deckers ₃ , Cornelis Kasse ₁ , Ronald van Balen ₁

Affiliation

The Miocene sequence in the Roer Valley Rift System consists of alternating open‐to‐shallow marine, coastal and fluvio‐deltaic deposits. In this study, well logs, bio‐chronostratigraphy and seismostratigraphy are used to characterize major units and their bounding unconformities and to infer sediment dispersal patterns. Three major unconformities occur in the sequence: the early, middle and late Miocene unconformities (EMU, MMU and LMU). The EMU formed due to tectonic motions related to the Savian phase. After formation of the EMU, a broad depocentre developed in the south‐eastern part of the Roer Valley Graben (RVG). Sediment accumulation increased during this period and peaked in the middle Langhian, after which it diminished again to a low level during the late Serravallian. The decrease in sediment accumulation coincided with a period of tectonic subsidence along the major bounding fault zones (i.e. the Peel Boundary Fault System, the Feldbiss Fault System and the Veldhoven Fault System). The resulting transgression caused sediment starvation in the central RVG. Subsequently, global sea‐level fall during the early Tortonian caused large‐scale erosion, and formation of incised valleys on the highs adjacent to the RVG (Peel Block and Campine Block), as well as the south‐eastern RVG, forming the MMU. However, sedimentation continued during this period in the central part of the RVG where no erosional hiatus developed. From the Tortonian onwards, accumulation rates increased again. The depocentre shifted towards the north‐west and clinoforms developed in the RVG. During the latest Miocene, the depocentre was concentrated along the south‐western margin of the RVG. Meanwhile, the depositional environment of the entire RVRS gradually shallowed as the LMU was formed.

中文翻译：

罗尔谷裂谷系统的中新世层序和沉积中心

罗尔谷裂谷系统的中新世序列由交替的开放至浅海海洋、沿海和河流三角洲沉积物组成。在这项研究中，测井、生物年代地层学和地震地层学被用来描述主要单元及其边界不整合面的特征，并推断沉积物扩散模式。层序中存在三个主要不整合面：早、中、晚中新世不整合面（EMU、MMU 和 LMU）。 EMU 的形成是由于与萨维安期有关的构造运动。动车组形成后，在鲁尔谷地堑 (RVG) 东南部发展了一个广泛的沉积中心。在此期间沉积物堆积增加，并在朗吉中期达到顶峰，之后在塞拉瓦阶晚期再次减少至较低水平。沉积物积累的减少与主要边界断层带（即皮尔边界断层系、费尔德比斯断层系和费尔德霍芬断层系）沿线的构造沉降时期同时发生。由此产生的海侵导致中部RVG 沉积物匮乏。随后，托尔顿纪早期全球海平面下降导致大规模侵蚀，并在 RVG（皮尔地块和 Campine 地块）以及 RVG 东南部附近的高地上形成切谷，形成 MMU。然而，在此期间，RVG 中部的沉积仍在继续，没有出现侵蚀间断。从托尔托尼阶开始，积累率再次增加。沉积中心向西北方向移动，斜形在 RVG 中发育。中新世晚期，沉积中心集中在RVG西南缘。同时，随着LMU的形成，整个RVRS的沉积环境逐渐变浅。

更新日期：2024-07-15

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