非海相沉积对基准面波动的响应及其在前寒武纪层序构建中的意义:印度拉贾斯坦邦晚新元古代Girbhakar砂岩

Pradip Samanta , Soumik Mukhopadhyay , Arunava Sen , Madhurya Roy
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引用次数: 0

摘要

在缺乏植被的前寒武纪沉积体系背景下,研究了晚新元古代Girbhakar砂岩独特的沉积模式。这项综合研究采用了相分析、河流构造元素分析和古水流分析相结合的综合方法,对研究区间内沉积学和沉积环境的控制因素提供了详细的见解。基于过程的相分析揭示了13种不同的相类型,分为5种组合,揭示了沉积古环境的多样性-从冲积扇和辫状河到过渡海相环境。初步形成了以碎屑流和多短命河道为主的盆地边缘冲积扇。该冲积扇及其相关的短暂河流系统的地层结构主要受干旱至半干旱气候条件下地下水位波动的影响。随着沉积坡度的减小,发生了从半多年生到多年生辫状河系的过渡。然而,这些河流系统的地层结构在基准面上升波动的响应中表现出明显的变化。其中下部为不整合面,上部为颗粒滞后,上部为波浪搅动砂岩,为低洼体系域。在LST早期,河道带在上游沉积半多年生辫状体系的北端远端推进,响应了Girbhakar海的北侵,与晚新元古代印度板块构型一致。向上粗化的沉积物可能属于辫状三角洲类型,由基准面逐渐上升、低表缘梯度和幕式浮华流形成,有利于矿床的下游发育。在地表温度晚期,多年生河流系统的演化导致整个研究区形成辫状平原沉积,下游为过渡性海洋单元。基准面上升速度的加快促进了海洋的改造,导致过渡性海洋沉积物的沉积。基准面上升的最后阶段标志着陆地沉积的停止,最终导致基地沉入海底。该研究强调了冲积沉积物对沉积下坡不同控制因素的独特响应。这从更广阔的角度提高了对新元古代冲积沉积动力学和由此产生的地层结构在时间和空间上的认识。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Responses of non-marine deposits to fluctuating base level and their implications in the Precambrian sequence building: Late Neoproterozoic Girbhakar Sandstone, Rajasthan, India
The distinctive sedimentation patterns of the late Neoproterozoic Girbhakar Sandstone were investigated within the context of a Precambrian sedimentation system devoid of vegetation. This comprehensive study utilized an integrated approach, incorporating facies analysis, fluvial architectural elements analysis, and palaeocurrent analysis, to offer detailed insights into the controlling factors of sedimentology and depositional settings within the studied interval. Process-based facies analysis revealed thirteen distinct facies types organized into five associations, uncovering a diverse range of depositional palaeoenvironments — from alluvial fan and braided fluvial to transitional marine settings. An alluvial fan, dominated by debris flow and multiple ephemeral channels at the basin margin, emerged initially. The stratigraphic architecture of this alluvial fan and the associated ephemeral fluvial system was primarily influenced by water table fluctuations in arid to semiarid climatic conditions. A transition to a semi-perennial to perennial braided fluvial system occurred as the depositional slope decreased. However, the stratigraphic architecture of these fluvial systems exhibited distinctive variations in response to fluctuating base level rise. Notably, the basal segment, characterized by an unconformity below and a granular lag succeeded by wave-agitated sandstone above, represented the lowstand systems tract (LST). During the early LST, channel belts prograded at the northern distal end of upstream aggradational semi-perennial braided systems in response to the transgression of Girbhakar Sea from the north, aligning with the late Neoproterozoic Indian plate configuration. The coarsening upward deposits suggest a potential classification as a braid-delta, formed by a gradual rise in base level, low epeiric gradient, and episodic flashy discharges, which facilitate the downstream development of this deposit. During the late LST, the evolution of perennial fluvial systems resulted in braid-plain deposits throughout the study area, with a transitional marine unit at the downstream site. An accelerated rate of base level rise facilitated marine reworking, leading to the deposition of transitional marine sediments. The final phase of base level rise marked the cessation of terrestrial deposition, culminating in the submergence of the site underneath the sea. The study highlights the unique responses of alluvial sediments to diverse controlling factors along the deposition downslope. This enhances insights into Neoproterozoic alluvial sedimentation dynamics and the resulting stratigraphic architecture in time and space from a broad perspective.
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