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MARINE GEOLOGY and GEOPHYSICS

机译：海洋地质与地球物理

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The Potiguar Basin, located in the Brazilian Equatorial Margin, evolved from a complex rifting process implemented during the Atlantic Ocean opening in the Jurassic/Cretaceous. Different driving mechanisms were responsible for the onset of an aborted onshore rift and an offshore rift that initiated crustal rupture and the formation of a continental transform margin. Therefore, we applied the backstripping method to quantify the tectonic subsidence during the rift and post-rift phases of Potiguar Basin formation and to analyze the spatial variation of subsidence during the two successive and distinct tectonic events responsible for the basin evolution. The parameters required to apply this methodology were extracted from 2D seismic lines and exploratory well data. The tectonic subsidence curves present periods with moderate subsidence rates (up to 300 m/My), which correspond to the evolution of the onshore Potiguar Rift (~141 to 128 Ma). From 128-118 Ma, the tectonic subsidence curves show no subsidence in the onshore Potiguar Basin, whereas subsidence occurred at high rates (over 300 m/My) in the offshore rift. The post-rift phase began ca. 118 Ma (Aptian), when the tectonic subsidence drastically slowed to less than 35 m/My, probably related to thermal relaxation. The tectonic subsidence rates in the various sectors of the Potiguar Rift, during the different rift phases, indicate that more intense faulting occurred in the southern portion of the onshore rift, along the main border faults, and in the southeastern portion of the offshore rift. During the post-rift phase, the tectonic subsidence rates increased from the onshore portion towards the offshore portion until the continental slope. The highest rates of post-rift subsidence (up to 35 m/My) are concentrated in the central region of the offshore portion and may be related to lithospheric processes related to the continental crust rupture and oceanic seafloor spreading. The variation in subsidence rates and the pattern of tectonic subsidence curves allowed us to interpret the tectonic signature recorded by the sedimentary sequences of the Potiguar Basin during its evolution. In the onshore rift area, the tectonic subsidence curves presented subsidence rates up to 300 m/My during a long-term rift phase (13 Ma), which confirmed that this portion had an extensional tectonic regime. In the offshore rift, the curves presented high subsidence rates of over 300 m/My in a shorter period (5-10 My), typical of basins formed in a transtensional tectonic regime.
机译：位于巴西赤道边缘的波提瓜尔盆地，是从侏罗纪/白垩纪大西洋开放期间实施的复杂裂谷过程演化而来的。陆上裂谷的破裂和海底裂谷的爆发是由不同的驱动机制引起的，这些裂谷引起了地壳破裂和大陆性转变边缘的形成。因此，我们应用反剥方法对波提瓜盆地形成的裂谷和裂陷后阶段的构造沉降进行了定量，并分析了造成盆地演化的两个连续且不同的构造事件期间的沉降空间变化。应用此方法所需的参数是从2D地震线和勘探井数据中提取的。构造沉降曲线呈现出中等沉降速率的时期（高达300 m / My），这与陆上波提瓜大裂谷（〜141至128 Ma）的演化相对应。从128-118 Ma，构造沉降曲线在陆上波提瓜尔盆地没有沉降，而在近海裂谷中沉降率很高（超过300 m / My）。裂谷后阶段开始于118 Ma（Aptian），当构造沉降急剧降低到35 m / My以下时，可能与热弛豫有关。在不同的裂谷阶段，波蒂瓜尔裂谷各部分的构造沉降速率表明，陆上裂谷的南部，主要边界断层和海上裂谷的东南部发生了更强烈的断层。在裂谷后阶段，构造沉降速率从陆上部分向近海部分增加，直到大陆斜坡。裂谷后沉降的最高速率（高达35 m / My）集中在近海部分的中部地区，可能与与大陆壳破裂和海底扩张有关的岩石圈过程有关。沉降速率的变化和构造沉降曲线的模式使我们能够解释波提瓜尔盆地在其演化过程中的沉积序列所记录的构造特征。在陆上裂谷区域，构造沉降曲线在长期裂谷阶段（13 Ma）呈现出高达300 m / My的沉降速率，这证实了这一部分具有伸展的构造体制。在近海裂谷中，这些曲线在较短的时期（5-10 My）内呈现出超过300 m / My的高沉降速率，这是典型的在张性构造状态下形成的盆地。

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    《Oceanographic Literature Review》 |2018年第6期|1228-1268|共41页
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