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Architecture of a tide-influenced, wave dominated shallow-marine deposit from a Paleoproterozoic rift setting: Example from the Badalgarh Formation, Bayana basin, Rajasthan, northwest India
Journal of Earth System Science ( IF 1.9 ) Pub Date : 2021-04-01 , DOI: 10.1007/s12040-021-01558-6
Partha Pratim Chakraborty , Rahul Bailwal

A ~125 m thick shallowing-upward arenaceous succession from the Badalgarh Formation, Bayana basin, India provided the opportunity to document shelf to foreshore transition from a paleoproterozoic rift set-up. Process-based facies analysis allowed identification of 12 different shallow-marine facies types, grouped under four different facies associations namely (i) lower offshore or open shelf, (ii) upper offshore to distal lower shoreface, (iii) lower to middle shoreface and (iv) upper shoreface to foreshore. From unequivocal dominance of wave- and storm-generated features and fortuitous documentation of tide-generated structures in upper offshore, lower and middle shoreface settings, we infer a tide-influenced, wave-dominated coast at the Badalgarh Sea. From measurement of different vector attributes through the studied succession, we infer (i) near east–west orientation for the Badalgarh shoreline, (ii) storm deposits as products of shore-perpendicular return flow, and (iii) tidal peak flow at a high angle with the shoreline and confined in the upper offshore, lower and middle shoreface settings. A gradational transition from offshore to lower shoreface and, in turn, to middle and upper shoreface suggests accretionary character for the Badalgarh shoreface in a high-gradient rift setting. Overlying deep water (distal offshore) argillaceous marine strata, the arenaceous shallowing-upward Badalgarh succession is interpreted as a product of highstand systems tract (HST) constituted of stacked tens- to hundreds of meter-thick shallowing-upward depositional cycles. Since the abrupt shift in facies type (shallow to deep water) across the upper boundaries of depositional cycles is not unambiguous, we intend to assign these cycles as genetic stratigraphic cycles or T-R cycles over ‘parasequence’.



中文翻译:

古元古代裂谷环境中受潮汐影响的波浪主导型浅海沉积物的构造:以印度西北部拉贾斯坦邦巴亚纳盆地的Badalgarh组为例

来自印度巴亚那盆地巴达加尔组的一个约125 m厚的浅层向上砂质岩性演替,提供了记录古生代裂谷构造向陆架过渡的机会。基于过程的相分析可以识别12种不同的浅海相类型,分为四种不同的相联系,即(i)下部海上或裸露的陆架,(ii)上部海上至远侧下部岸面,(iii)下部至中岸面以及(iv)上岸至前滨。从波浪和风暴产生的特征的明确优势以及在上,近,中海岸面的潮汐产生结构的偶然记录,我们推断出在Badalgarh海域受潮汐影响,以波浪为主的海岸。从对不同向量属性的测量到所研究的继承,我们推断(i)Badalgarh海岸线的东西走向附近,(ii)风暴沉积物是沿岸垂直回流的产物,并且(iii)潮汐峰值流与海岸线成高角度并限制在近海上游,下和中岸设置。从近海到下岸,再到中,上岸的逐步过渡表明,在高梯度裂谷环境中,Badalgarh岸面具有增生特征。砂岩浅层向上的Badalgarh演替覆盖在深水(远海)藻类海相地层上,被解释为是由数十至数百米厚的浅层向上沉积堆积叠加的高位系统道(HST)的产物。

更新日期:2021-04-01
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