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首页> 外文期刊>Facies >Upper Cretaceous paleogeography of the Central Southern Pyrenean Basins (Catalonia, Spain) from microfacies analysis and charophyte biostratigraphy
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Upper Cretaceous paleogeography of the Central Southern Pyrenean Basins (Catalonia, Spain) from microfacies analysis and charophyte biostratigraphy

机译：中南部比利牛斯盆地上层白垩纪古地理（西班牙加泰罗尼亚），通过微相分析和碳素体生物地层学

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摘要

The most extensive latest Cretaceous deposits of the Pyrenees are non-marine facies traditionally called "Garumnian", which represent the first continentalization of the Pyrenean Foreland Basins. The age and paleogeography of the basal Garumnian facies in the different parts of the Pyrenean Basin has been a matter of debate. Charophyte biostratigraphy and microfacies analysis suggest that the continentalization was diachronous in the Central Southern Pyrenean basins, i. e., between the àger and Tremp basins, and the emersion progressed from south to north. In the àger Basin, to the south, the first Upper Cretaceous non-marine rocks are represented by the La Ma?ana Formation. This unit is mainly formed by freshwater lacustrine limestones organized into hundreds of shallowing-upwards sequences ranging from deeper lacustrine facies, through marginal, well-illuminated environments dominated by characean meadows, and finishing with lakeshores dominated by clavatoracean meadows. The charophyte assemblage from the La Ma?ana Fm is mainly formed by Peckichara cancellata, P. sertulata, Microchara cristata, M. parazensis, Platychara caudata, and Clavator brachycerus, which belong to the Peckichara cancellata charophyte biozone (Late Campanian). In contrast, in the Tremp Basin, located to the north, the beginning of the non-marine sedimentation is organized into a few cycles of the well-known La Posa Fm. These cycles begin with brackish deposits formed by thick marls with euryhaline molluscs at the base, followed by lignite and brackish to freshwater limestones. The brackish facies are dominated by porocharaceans. The charophyte assemblage of the La Posa Formation is formed by Feistiella malladae, Peckichara sertulata, Microchara cristata, and Clavator brachycerus, which belong to the Septorella ultima charophyte biozone (Early Maastrichtian).
机译：比利牛斯山脉最广泛的白垩纪最新沉积物是非海洋相，传统上称为“ Garumnian”，这是比利牛斯山前陆盆地的首次大陆化。在比利牛斯山盆地的不同地区，基隆河谷相的年龄和古地理问题一直存在争议。 Charophyte的生物地层学和微相分析表明，中比利牛斯山脉中南部盆地大陆化是历时的。例如，在阿格（Ager）和特兰普（Tremp）盆地之间，火山爆发从南到北发展。在南部的阿格盆地，最早的上白垩统非海洋岩石以拉马纳纳组为代表。这个单元主要由淡水湖相石灰岩组成，这些石灰岩被组织成数百个浅层向上的序列，范围从较深的湖相，到以恰拉桑草甸为主导的边缘，光线充足的环境，最后以克拉瓦托拉斯草甸为主导的湖岸。 La Ma？ana Fm的轮藻主要由Peckichara cancellata，P。sertulata，Microchara cristata，M.parazensis，Platychara caudata和Clavator brachycerus组成，它们属于Peckichara cancellata charophyte生物区（Late Campanian）。相反，在北部的特兰普盆地，非海洋沉积的开始被组织成几个著名的La Posa Fm的周期。这些循环开始于咸的沉积物，该沉积物由浓厚的泥灰岩和底部的淡紫色石灰石形成，这些沉积物由浓淡的泥灰岩形成。苦咸相主要由婆罗洲类动物组成。拉波萨组的风化石组合是由费氏小夜蛾，百日草，微风化菌和短吻鳄（Clavator brachycerus）形成的，属于费城风化菌（Septorella ultima）风化生物区（Maastrichtian早期）。

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