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首页> 外文期刊>Facies >Evolution of shallow benthic communities during the late Paleocene-earliest Eocene transition in the northern Tethys (SW Slovenia)
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Evolution of shallow benthic communities during the late Paleocene-earliest Eocene transition in the northern Tethys (SW Slovenia)

机译：特提斯北部（新南威尔士州）古新世晚期至始新世过渡期间浅层底栖生物群落的演变

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摘要

A paleoecological and sedimentological study was carried out on shallow-water carbonates of the Kras Plateau (SW Slovenia) with the goal of reconstructing paleoenvironmental conditions and evolution of foraminiferal communities on the northwestern Adriatic Carbonate Platform (AdCP) during the Late Paleocene-earliest Eocene. Three facies have been recognized and summarized in a carbonate ramp model. Within these facies, six foraminiferal assemblages, representing different ramp sub-environments, have been defined: during the Late Paleocene sedimentation took place in a protected innermost ramp with (1) smaller miliolids- and (2) small benthic foraminifera-dominated assemblages thriving on partly vegetated, soft substrates. In the Uppermost Paleocene, sedimentation primarily occurred along a mid ramp. The upper mid-ramp was sporadically influenced by storms/currents and occupied by (3) Assilina-dominated assemblage occurring on a soft sandy substrate. The deeper mid-ramp was characterized by (4) 'bioconstructors'- and (5) orthophragminids-dominated assemblages, colonizing biotopes with substrates of different nature. During the earliest Eocene, deposition occurred in an inner-ramp setting with (6) alveolinids-nummulitids assemblage thriving on muddy and sandy substrate, partly covered or close to seagrass beds. The Late Paleocene-earliest Eocene environmental conditions, coupled with the long-term evolution of larger benthic foraminifera (LBF), seem to have favored this low-light dependent group as common sediment contributors. By comparing the evolution of the shallow-water biota from the Adriatic area with data from the Pyrenees and Egypt, a general latitudinal trend can be recognized. However, on a smaller geographical scale, local conditions are likely to have played a pivotal role in promoting the evolution of biota characterized by suites of unique features.
机译：为了在古新世晚期始新世晚期西北亚得里亚海碳酸盐岩台地（AdCP）上重建古环境条件和有孔虫群落的演化，对克拉斯高原（斯洛文尼亚西南部）的浅水碳酸盐岩进行了古生态学和沉积学研究。在碳酸盐岩斜坡模型中已经识别并总结了三个相。在这些相中，已经定义了代表不同坡道亚环境的六个有孔虫组合：在古新世晚期，沉积是在受保护的最里面的坡道上进行的，其中（1）较小的粟粒类和（2）小型以底栖有孔虫为主的组合在部分植被的柔软基质。在最上古新世，沉积主要发生在中斜坡。上部中匝道偶尔受到风暴/洋流的影响，并被（3）在柔软的沙质基底上发生的以Assilina为主的组合所占据。较深的中斜坡的特征是（4）'生物构造体'-和（5）直rag虫主导的组合，用不同性质的底物定居生物群落。在最早的始新世期间，沉积发生在内部斜坡环境中，在泥质和沙质底物上部分地覆盖或靠近海草床，其中（6）个肺泡-数量组合繁盛。晚古新世始新世的环境条件，加上较大的底栖有孔虫（LBF）的长期演变，似乎偏爱这种低照度族群作为常见的沉积物贡献者。通过将亚得里亚海地区浅水生物区系的演化与比利牛斯山和埃及的数据进行比较，可以认识到一般的纬度趋势。然而，在较小的地理范围内，当地条件可能在促进以一系列独特特征为特征的生物群的进化中起着关键作用。

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