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High-resolution sedimentary budget quantification – Example from the Cenozoic deposits in the Pelotas Basin, South Atlantic
Basin Research ( IF 2.8 ) Pub Date : 2021-02-14 , DOI: 10.1111/bre.12556 S. Rohais 1 , J.P. Lovecchio 2 , V. Abreu 3 , M. Miguez 4 , S. Paulin 5
Basin Research ( IF 2.8 ) Pub Date : 2021-02-14 , DOI: 10.1111/bre.12556 S. Rohais 1 , J.P. Lovecchio 2 , V. Abreu 3 , M. Miguez 4 , S. Paulin 5
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In this paper, we propose a high-resolution (HR) sedimentary budget quantification at basin-scale for the Cenozoic deposits of the Pelotas Basin (South Atlantic). A new workflow is implemented including five main steps: (1) basin-scale analysis and characterization, (2) quality control and selection of reference 2D dip-sections, (3) HR seismic stratigraphy analysis, (4) sediment supply estimation taking into account lithology and porosity corrections and then (5) the estimation of the sedimentary budget curve including 41 time-intervals for the last 65 Myr. Variance ranges were determined considering the parameters of the method on the case study. The main uncertainties are related to the seismic velocities for the time-to-depth conversion (5%–22%), the method for lithological parameters quantification and associated porosity correction (4.4%–14.3%), the absolute ages of stratigraphic markers (1%–25%), and the proportion of in-situ sediment production (0.3%–0.5%). For the very first time, this method allows the identification of several cycles from an entire sedimentary basin fill characterized by pulses of sediment supply (Qs) whose growth phase lasts less than 1 Myr, followed by a constant phase lasting 1–2 Myr, and finally an exponentially decreasing phase lasting 2–5 Myr. These pulses alternate with phases where the sediment supply was very low for intervals of ca. 1–5 Myr. Ten major pulses were recognized during the Cenozoic. We propose that the sediment supply dynamic in the Pelotas basin records the orogenic phases of the Andes located more than 2,000 km upstream. The recorded Qs pulses in the basin are out of phase with respect to the active tectonic phases of the Central Andes. Finally, by comparing the volume of preserved sediment and the production capacity of the catchment, we suggest that a source of sediment in addition to the Brazilian craton and the Andes should be envisaged, potentially associated with deep-water oceanic circulation.
中文翻译：
高分辨率沉积预算量化——以南大西洋佩洛塔斯盆地新生代沉积物为例
在本文中，我们为 Pelotas 盆地（南大西洋）的新生代矿床提出了盆地尺度的高分辨率 (HR) 沉积预算量化方法。实施了一个新的工作流程，包括五个主要步骤：(1) 盆地尺度分析和表征，(2) 质量控制和参考二维倾角剖面的选择，(3) HR 地震地层分析，(4) 沉积物供应估计考虑岩性和孔隙度校正，然后 (5) 估计沉积收支曲线，包括最近 65 Myr 的 41 个时间间隔。考虑到案例研究中方法的参数，确定了方差范围。主要的不确定性与时深转换的地震速度 (5%–22%)、岩性参数量化方法和相关孔隙度校正 (4.4%–14. 3%)、地层标志绝对年龄(1%~25%)、原位产沙比例(0.3%~0.5%)。这种方法第一次允许从整个沉积盆地填充中识别几个循环，其特征是沉积物供应脉冲 (Qs)，其生长阶段持续不到 1 Myr，随后是持续 1-2 Myr 的恒定阶段，并且最后是一个持续 2-5 Myr 的指数递减阶段。这些脉冲与沉积物供应量非常低的阶段交替出现。1-5 密尔 在新生代期间识别了十个主要脉冲。我们建议 Pelotas 盆地的沉积物供应动态记录了位于上游 2,000 公里以上的安第斯山脉的造山阶段。盆地中记录的 Qs 脉冲与安第斯山脉中部的活动构造阶段异相。
更新日期：2021-02-14
中文翻译：
高分辨率沉积预算量化——以南大西洋佩洛塔斯盆地新生代沉积物为例
在本文中，我们为 Pelotas 盆地（南大西洋）的新生代矿床提出了盆地尺度的高分辨率 (HR) 沉积预算量化方法。实施了一个新的工作流程，包括五个主要步骤：(1) 盆地尺度分析和表征，(2) 质量控制和参考二维倾角剖面的选择，(3) HR 地震地层分析，(4) 沉积物供应估计考虑岩性和孔隙度校正，然后 (5) 估计沉积收支曲线，包括最近 65 Myr 的 41 个时间间隔。考虑到案例研究中方法的参数，确定了方差范围。主要的不确定性与时深转换的地震速度 (5%–22%)、岩性参数量化方法和相关孔隙度校正 (4.4%–14. 3%)、地层标志绝对年龄(1%~25%)、原位产沙比例(0.3%~0.5%)。这种方法第一次允许从整个沉积盆地填充中识别几个循环，其特征是沉积物供应脉冲 (Qs)，其生长阶段持续不到 1 Myr，随后是持续 1-2 Myr 的恒定阶段，并且最后是一个持续 2-5 Myr 的指数递减阶段。这些脉冲与沉积物供应量非常低的阶段交替出现。1-5 密尔 在新生代期间识别了十个主要脉冲。我们建议 Pelotas 盆地的沉积物供应动态记录了位于上游 2,000 公里以上的安第斯山脉的造山阶段。盆地中记录的 Qs 脉冲与安第斯山脉中部的活动构造阶段异相。
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