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The syn-rift tectono-stratigraphic record of rifted margins (Part II): A new model to break through the proximal/distal interpretation frontier
Basin Research ( IF 3.2 ) Pub Date : 2021-10-25 , DOI: 10.1111/bre.12628
Pauline Chenin 1 , Gianreto Manatschal 1 , Jean‐François Ghienne 1 , Peng Chao 1
Affiliation  

One fundamental lesson from the last decade's research into rifted margins is that stratigraphic horizons cannot be simply correlated from the proximal into distal domain, which makes the interpretation of poorly calibrated and largely inaccessible distal margins difficult. In this contribution, we propose a new tectono-stratigraphic model to help break through the proximal/distal interpretation frontier. After reviewing the scientific advances on rifted margins achieved during the last century, we describe the primary spatio-temporal evolution of active deformation during rifting. We show that different rift domains are associated with specific (1) periods of active deformation; (2) tectonic structures and related stratigraphic architecture; (3) amounts of accommodation creation owing to specific ranges of horizontal widening and vertical deepening and (4) depositional environments. We demonstrate that the sequential localization of extension during rifting results in a younging of the base of passive infill (i.e. sediment deposited in a non-tectonic setting) oceanward. We propose a panel of few to few tens of My time intervals related to specific tectonic events—our Tectonic Sequences—that may be correlated more or less easily and continuously across rifted margins. This study underlines the value of an iterative approach between fieldwork on fossil rifted margins and offshore geophysical studies, where field studies offer easy-to-access and high-resolution calibration of dismembered rifted margin remnants, while geophysical studies provide comparatively low-resolution imaging of entire, intact but largely inaccessible, rifted margins. It also highlights the necessity of jettisoning outdated dogma on rifted margins and changing our routines when interpreting seismic sections and outcrops.

中文翻译:

裂谷边缘同裂谷构造地层记录(下):一种突破近端/远端解释前沿的新模式

过去十年对裂谷边缘的研究的一个基本教训是,地层层位不能简单地从近端域到远端域相关联,这使得对校准不良和基本上难以接近的远端边缘的解释变得困难。在这篇文章中,我们提出了一种新的构造地层模型,以帮助突破近端/远端解释前沿。在回顾了上个世纪在裂谷边缘取得的科学进展后,我们描述了裂谷过程中活动变形的主要时空演变。我们表明,不同的裂谷域与特定的(1)活动变形周期相关;(2) 构造构造及相关的地层构造;(3) 由于特定的水平加宽和垂直加深范围和 (4) 沉积环境而产生的容纳量。我们证明了在裂谷过程中延伸的连续定位导致被动填充物(即沉积在非构造环境中的沉积物)向海洋年轻化。我们提出了一个由几到几十个与特定构造事件相关的 My 时间间隔组成的面板——我们的构造层序——在裂谷边缘可能或多或少容易且连续地关联。这项研究强调了在化石裂谷边缘的实地工作和近海地球物理研究之间采用迭代方法的价值,其中实地研究提供了对被肢解的裂谷边缘残余物的易于访问和高分辨率的校准,而地球物理研究提供了相对低分辨率的成像完整的、完整的但在很大程度上难以接近的裂隙边缘。它还强调了在解释地震剖面和露头时抛弃裂谷边缘过时的教条和改变我们的常规的必要性。
更新日期:2021-10-25
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