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首页> 外文期刊>Stratigraphy >Calibration of Eocene-Oligocene charophyte biozones in the Eastern Ebro Basin (Catalonia, Spain)
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Calibration of Eocene-Oligocene charophyte biozones in the Eastern Ebro Basin (Catalonia, Spain)

机译：埃布罗东部盆地（西班牙加泰罗尼亚）始新世-渐新世的藻类生物带的标定

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摘要

A charophyte biozonation for the transitional and continental Upper Eocene-Lower Oligocene record in the eastern margin of the Ebro Basin is performed and calibrated using magnetostratigraphic data. This study has been based on intensive sampling collected along five composite sections. The Harrisichara vasiformis-tuberculata European biozone has been renamed to H. lineata biozone, since the former index-species was a poorly characterised morphotype with a non-valid species name. This biozone is represented in the transitional Sant Boi Formation and the lowermost part of the Artés Formation in the northeastern sector of the basin, within the normal part of chron C16. The Harrisichara tuberculata European superzone encompasses most of the continental Artés Formation in the northeastern sector and the Margalef Formation in the southeastern sector of the basin ranging from chron C16n.2n (~35.5 Ma) to chron C12r (~31.5 Ma). Included within the Harrisichara tuberculata superzone, the Lychnothamnus vectensis European biozone was redefined as the interval between the first occurrence of Lychnothamnus vectensis and the first occurrence of Lychnothamnus pinguis. Redefinition of the Lychnothamnus vectensis biozone implies that its basal limit does not coincide with the basal limit of the Harrisichara tuberculata superzone, as previously believed. The absence of L. pinguis in the Ebro Basin, and probably in all Southern Europe, results in a local Lychnothamnus vectensis biozone for that area including the total distribution range of this index species. Magnetostratigraphic correlation suggests that this biozone ranges in the Ebro Basin from chron C13r (-34.5 Ma) to chron C13n (~33.5 Ma) including the Eocene-Oligocene boundary. A new local Harrisichara tuberculata-Nodosochara jorbae assemblage zone was defined at the base of Harrisichara tuberculata superzone coinciding with the base of the Artés Formation in the northeastern sector, ranging between chron C16n.2n and chron C13r. The Lychnothamnus major European biozone encompasses the lower part of the continental Albi Formation in the southeastern sector of the basin within chron C12r. The lower limit of the Chara microcera European biozone is recorded in the Tàrrega Formation. Litho- and magnetostratigraphic correlation suggests that the lower limit of this biozone belongs to the uppermost part of chron C12r (~31 Ma). Comparisons with homologous data from the classical Upper Eocene-Lower Oligocene Solent Group in the Hampshire Basin (Isle of Wight, UK) suggest that the lower limit of the Harrisichara tuberculata superzone is isochronous in Europe but was recorded earlier in the Ebro Basin than in the Hampshire Basin due to more appropriate palaeoecological conditions.
机译：对埃布罗盆地东缘的过渡和大陆上始新世-下渐新世记录进行了碳素体生物分区，并利用地磁地层数据进行了标定。这项研究是基于沿五个复合部分收集的密集采样进行的。欧洲原产哈里斯哈拉vasiformis-tuberculata欧洲生物区已重命名为H. lineata生物区，因为前一个索引物种的特征型很差，物种名称无效。该生物区的代表是过渡的Sant Boi地层和盆地东北部的阿特斯地层的最下部，在C16年代的正常部分内。欧洲超级哈里斯哈拉结核病涵盖了盆地东北部的大部分大陆Artés组和盆地东南部的Margalef组，范围从C16n.2n（〜35.5 Ma）到C12r（〜31.5 Ma）。包括在哈里斯哈拉结核菌超区中的欧洲荔枝生物区被重新定义为第一次出现荔枝和第一次出现pinchins之间的间隔。如前所述，重新定义Lychnothamnus vectensis生物区意味着它的基础极限与哈里斯哈德结核菌超区的基础极限不一致。在埃布罗盆地以及可能在整个南欧缺乏pinguis湖，导致该地区出现了Lychnothamnus vectensis生物区，包括该指标物种的总分布范围。磁地层学相关性表明，该生物带在埃布罗盆地的年龄范围为C13r（-34.5 Ma）到C13n（〜33.5 Ma），包括始新世-渐新世边界。在Harrishara结核菌超区的底部定义了一个新的当地Harrishara结核菌-Nodosochara jorbae组合带，与东北地区的Artés构造的底部相吻合，范围在C16n.2n和C13r之间。 Lychnothamnus欧洲主要生物区在chron C12r以内，位于盆地东南部的Albi大陆下部。欧洲炭疽菌微生物区的下限记录在塔雷加组。岩石和地层学相关性表明，该生物带的下限属于chron C12r（〜31 Ma）的最高部分。与来自汉普郡盆地（英国怀特岛）的经典始新世-始新世-下渐新世孤立群的同源数据进行比较，结果表明，欧洲哈里斯原结核超区的下限是等时的，但在埃布罗盆地的记录早于Hampshire盆地由于更合适的古生态条件。

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