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首页> 外文OA文献 >The Middle Jurassic eastern margin of the Iberian platform system (eastern Spain). Palaeogeography and biodispersal routes of ammonoids.
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The Middle Jurassic eastern margin of the Iberian platform system (eastern Spain). Palaeogeography and biodispersal routes of ammonoids.

机译：伊比利亚平台系统的中侏罗统东缘（西班牙东部）。氨的古地理和生物扩散途径。

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From a sedimentological and palaeogeographical pointudof view, in the eastern margin of the Iberian platform system, MiddleudJurassic deposits are represented by a thick pile of carbonates with minorudmarls interbedded. Different facies, within the Tortosa, Aragoneseudand Castilian platforms, pertain to two categories: internal platformudand external platform facies. A system of extensional faults was theudmajor factor determining the differentiation of several shallow, carbonate,udepicontinental platforms. The so-called Iberian Basin was audshallow intracratonic platform system, in which a relatively deep extensionaludbasin (the Catalan Basin) started to be differentiated duringudthe late Bajocian. In the eastern part of this faulted platform system,udthe occurrence of a listric fault, dipping towards the east, conditionedudthe development of a late Bajocian differentiated subsident area namedudthe Tortosa Platform.udFrom a palaeobiogeographical point of view, the ammonite fossiludassemblages of the Iberian platforms are composed of Sub-Mediterraneanudtaxa. At the eastern margin of the Iberian platform system,udthe appearance and distribution of shells of ammonoids were taphonomicallyudand ecologically controlled by regional changes of relativeudsea level. A Sub-Mediterranean zonation can be recognized, althoughudmost of the ammonites shells correspond to adult individuals arrivedudby necroplanktic drift from more open-marine or oceanic areas. Theudfollowing criteria are relevant in recognizing the maximum deepeningudepisodes in the Iberian platform system: colonization (including ontogenicuddevelopment) of open-marine taxa, immigration of oceanic taxaudand development of endemic species. In terms of Sequence Stratigraphy,udthe development of expanded, external platform sections in the TortosaudPlatform during the Garantiana Biochron (late Bajocian) is noteworthy.udDuring this episode, the Iberian platform system reached theudmaximum bathymetric values and acted as a biogeographical dispersaludarea for some taxonomic groups of ammonoids between the WesternudTethys and the Proto-Atlantic.
机译：从沉积学和古地理学的角度来看，在伊比利亚平台系统的东缘，中侏罗统侏罗纪沉积物是由一叠厚的碳酸盐岩组成，其中夹杂有次要的 udmarls。在Tortosa中，Aragonese udand Castilian平台内的不同相属于两类：内部平台 ud和外部平台相。伸展断层系统是决定几个浅层碳酸盐岩，陆上陆相平台差异的主要因素。所谓的伊比利亚盆地是一个浅层的克拉通内部平台系统，其中一个较深的伸展盆地（加泰罗尼亚盆地）在巴约西亚晚期才开始分化。在这个断层平台系统的东部，向东倾斜出现了一定的断层，这是后来的巴约克后期分化的下陷区域-乌托托萨平台的发育的条件。／ud从古生物地理学的角度来看，am石伊比利亚台地的化石/侏罗纪组合由地中海次生 udtaxa组成。在伊比利亚平台系统的东边缘，氨水的壳的外观和分布是受相对海平面变化的区域学和生态学控制的。尽管大部分的炸药壳对应于从较开阔的海洋或大洋地区的坏死浮游生物抵达的成年个体，但可以识别出地中海南部的一个带。遵循以下标准与识别伊比利亚平台系统中最大的加深 udepisodes有关：公开海洋分类群的定殖（包括成因 uddevelop），海洋分类群的迁徙特有物种的发育。在层序地层学方面，在Garantiana Biochron（Bajocian晚期）期间，在Tortosa udPlatform中扩展的外部平台部分的发展是值得注意的。 ud在这一事件中，伊比利亚平台系统达到了 ud的最大测深值，并作为西 udTethys与原始大西洋之间某些类群生物类的生物地理分布 darea。

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