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Neogene history of the Carapita Formation, Eastern Venezuela Basin

机译：委内瑞拉东部盆地Carapita组的新近历史

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摘要

Based on the stratigraphic distribution of planktonic microfossils (mostly planktonic foraminifera) and abundance patterns of benthic foraminifera we determine the temporal completeness of one land section and three wells through the Lower and Middle Miocene Carapita Formation of eastern Venezuela, compare the extent of the hiatuses in the sections and document changes in paleodepth at these localities during the early and Middle Miocene. We determine that changes in paleodepth are associated with hiatuses, but see no relationship with the global changes in sea-level inferred from deep sea isotope records. This strongly suggests that there was a strong tectonic forcing on stratigraphic architecture at upper and middle bathyal depths, as to be expected in a tectonically active area. However, similar stratigraphic patterns are also observed elsewhere, implying that a widespread tectonic structuring of the stratigraphic architecture may have been operative. Recognition of hiatuses (not merely unconformities) as primary stratigraphic components will make possible an uninterrupted documentation of sequences boundaries from subaerial to bathyal environments, and help determine objectively the structural mechanism(s) operating on the genesis of stratigraphic sequences (sensu Catuneanu et al. 2009). Biostrati-graphy (and biochronology) are the main tools to understanding this structuring.
机译：根据浮游微化石（主要是浮游有孔虫）的地层分布和底栖有孔虫的丰度模式，我们确定了委内瑞拉东部中新世下中新统卡拉皮塔组一个陆段和三口井的时间完整性，比较了该区的裂隙程度在中新世早期和中期，这些地区的剖面和文件的古深变化。我们确定古深度的变化与裂隙有关，但没有发现与深海同位素记录推断的全球海平面变化有任何关系。这强烈表明，在上，中层深水处，地层构造受到了强烈的构造作用，这在构造活动区域是可以预期的。但是，在其他地方也观察到了类似的地层模式，这意味着该地层构造的广泛构造构造可能已经起作用。将裂隙（不仅是不整合面）识别为主要地层成分，将有可能不间断地记录从地下环境到海底环境的层序边界，并有助于客观地确定在地层层序成因上起作用的结构机制（sensu Catuneanu等人。 2009）。生物地层学（和生物年代学）是理解这种结构的主要工具。

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