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Continental input on shelfal deposits unveiled by integration of ichnology, sedimentology, and taphonomy: A case study in givetian beds of the Paraná basin, Brazil
Journal of South American Earth Sciences ( IF 1.7 ) Pub Date : 2021-04-19 , DOI: 10.1016/j.jsames.2021.103342
Elvio Pinto Bosetti , Renata Guimarães Netto , Francisco Manoel Wohnrath Tognoli , Daniel Sedorko , Willian Mikio Kurita Matsumura

The Devonian succession in Paraná Basin encompasses marine deposits bearing fossils representative of the Malvinokaffric Realm, corroborated by sedimentological and ichnological data. Although the trace fossil assemblage preserved in these beds is archetypal of fully marine conditions, signs of environmental stressing conditions can be observed locally in the Givetian beds. This study aims to provide an integrated ichnological, sedimentological, and taphonomic analysis to test the hypothesis of a continental influence in the shallow marine environmental settings that sheltered the Malvinokaffric Realm in the Paraná Basin during the Lower Givetian. The integration among seven lithofacies, nine ichnofabrics, and three taphofacies allowed identifying a continental influence associated with salinity variations in a prograding section of an early highstand systems tract, above the maximum flooding surface (Kačák Evet). The stress apparently caused by salinity fluctuations, as indicated by the ichnological signatures, and the high organic input in the Itáytyba outcrop succession may be related to freshwater flows that were reworked by longshore currents. The results presented herein support the hypothesis that continental influxes along shoreline fed by rivers locally generated shoreline progradation and affected the Paraná Basin shelfal settings during the Lower Givetian. It contributed to reducing the benthic diversity in the Malvinokaffric Realm, as normally expressed in the basal intervals of Devonian beds from Paraná Basin.



中文翻译:

陆相,陆相沉积学和沉积学相结合揭示了陆架沉积物的输入:以巴西帕拉纳盆地的吉里特层为例

巴拉那盆地的泥盆纪演替涵盖了由代表马尔维诺法克里克地区的化石构成的海相沉积,并由沉积学和水文研究数据证实了这一点。尽管这些河床中保存的微量化石组合物是完全海洋条件的原型,但在吉文田河床中可以局部观察到环境压力条件的迹象。这项研究的目的是提供一个综合的鱼类学,沉积学和沉积学分析,以检验假说在下吉夫田下巴拉那盆地Malvinokaffric领域庇护的浅海环境中对大陆影响的假设。七个岩相,九个ichnofabrics,加上三个塔基,可以确定与高潮区(KačákEvet)以上的早期高水位系统区域的盐分变化有关的大陆性影响。鱼类学特征表明,盐度波动显然引起了压力,伊塔蒂巴露头演替过程中有机物的输入较高,这可能与被近岸水流重新利用的淡水流量有关。本文提出的结果支持这样的假设:沿河流流入的大陆涌入河段,局部产生海岸线扩展,并影响了下吉夫田下巴拉那盆地的陆架环境。正如通常以巴拉那盆地的泥盆纪底基间隔所表示的那样,它有助于减少马尔维诺科河界的底栖生物多样性。高于最大洪水面(KačákEvet)。鱼类学特征表明,盐度波动显然引起了压力,伊塔蒂巴露头演替过程中有机物的输入较高,这可能与被近岸水流重新利用的淡水流量有关。本文提出的结果支持这样的假设:沿河流流入的大陆涌入河段,局部产生海岸线扩展,并影响了下吉夫田下巴拉那盆地的陆架环境。正如通常以巴拉那盆地的泥盆纪底基间隔所表示的那样,它有助于减少马尔维诺科河界的底栖生物多样性。高于最大洪水面(KačákEvet)。鱼类学特征表明,盐度波动显然引起了压力,伊塔蒂巴露头演替过程中有机物的输入较高,这可能与被近岸水流重新利用的淡水流量有关。本文提出的结果支持这样的假设:沿河流流入的大陆涌入河段,局部产生海岸线扩展,并影响了下吉夫田下巴拉那盆地的陆架环境。正如从巴拉那盆地的泥盆纪河床的基底层通常所表示的那样,它有助于减少马尔维诺科河界的底栖生物多样性。Itáytyba露头演替过程中有机物的大量投入可能与被近岸水流重新加工的淡水流量有关。本文提出的结果支持这样的假说,即沿河支流的大陆性涌入在当地产生了海岸线发育,并影响了下吉夫田下巴拉那盆地的陆架环境。正如通常以巴拉那盆地的泥盆纪底基间隔所表示的那样,它有助于减少马尔维诺科河界的底栖生物多样性。Itáytyba露头演替过程中有机物的大量投入可能与被近岸水流重新加工的淡水流量有关。本文提出的结果支持这样的假设:沿河流流入的大陆涌入河段,局部产生海岸线扩展,并影响了下吉夫田下巴拉那盆地的陆架环境。正如通常以巴拉那盆地的泥盆纪底基间隔所表示的那样,它有助于减少马尔维诺科河界的底栖生物多样性。

更新日期:2021-04-27
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