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首页> 外文期刊>Facies >Toarcian ammonitico rosso facies from the South Iberian Paleomargin (Betic Cordillera, southern Spain): paleoenvironmental reconstruction
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Toarcian ammonitico rosso facies from the South Iberian Paleomargin (Betic Cordillera, southern Spain): paleoenvironmental reconstruction

机译：来自南伊比利亚古边缘（西班牙南部的比迪科迪勒拉）的ar矽统罗斯索相：古环境重建

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The Toarcian ammonitico rosso facies were widespread in the Mediterranean Tethys (between 15 and 30 degrees N latitude) in the North Gondwana Paleomargin (Apulian promontory and North African Margin) and southern Iberian Paleomargin (Betic Cordillera). These facies were associated with epi-oceanic slopes of a sedimentary swell-trough system related to the extensional phase of continental rifting. In the Median Subbetic (southern Iberian Paleomargin), ammonitico rosso facies show a progressive change through the Toarcian on the hemipelagic swells after the fragmentation of a carbonate platform. During the latest Pliensbachian to the Bifrons Zone (middle Toarcian), sedimentation was dominated by epi-oceanic limestone and marl with a high influence of neighboring shallow-water environments represented by common turbidite-tempestite beds (with foraminifera and ooids). Microfossils and trace fossils provide no evidence of oxygen-restricted conditions. In the Gradata Zone (middle Toarcian), the ammonitico rosso facies appear (red nodular limestone and marly-limestone rich in the trace fossils Phycodes, Planolites, Thalassinoides, and Chondrites). Progressively more pelagic conditions and a restricted influence of emergent lands and carbonate platforms are reflected by the reduced input of turbidite-tempestite beds and increase of ammonitellas and radiolaria. A sea-level fall affected the hemipelagic swell during the middle-late Toarcian and favored sediment-winnowing by currents, with subsequent nodulation. The combined action of burrowing, compaction, and dissolution controlled nodulation, which ranges from diffuse nodules to sharp-edged nodules. The sedimentation rate conditioned the time available for nodule growth, the migration of the Ca2+ and HCO3- precipitation horizon, and the degree of nodulation (from horizons with diffuse-edged nodules to semi-continuous to continuous layers formed by the coalescence of sharp-edged nodules).
机译：Toarcian ammonitico rosso相广泛分布在地中海特提斯（北纬15至30度之间）的北部Gondwana古边缘（阿普利亚海角和北非边缘）和南部伊比利亚古边缘（Betic Cordillera）。这些相与与大陆裂陷的伸展期有关的沉积膨胀-槽系统的前大洋斜坡有关。在中亚北部（伊比利亚南部古边缘），碳酸盐台地碎裂后，铵盐类罗素相在半浮肿上通过Toarcian逐渐显示出变化。在最近的Pliensbachian到Bifrons区（Toarcian中部）期间，沉积以表层海洋石灰岩和泥灰岩为主，对以常见的浊石-钛铁矿床（有孔虫和卵石）为代表的邻近浅水环境的影响很大。微化石和微量化石没有提供氧气受限条件的证据。在格拉达特带（Toarcian的中部），出现了氨水罗索相（红色节状石灰石和马来石灰石，富含微量化石Phycodes，Planolites，Thalasinoides和球粒陨石）。越来越多的中上层条件和对新兴土地和碳酸盐台地的影响受到限制，这是由于减少了浊石-钛铁矿床的投入以及氨水和放射虫的增加。海平面下降影响了中晚Toarcian时期的半海浪膨胀，并有利于洋流对沉积物进行风选，并随后结节。挖洞，压实和溶蚀控制结瘤的综合作用，范围从弥散性结节到锋利结节。沉积速率调节了结节生长的时间，Ca2 +和HCO3-沉淀层的迁移以及结节的程度（从具有散边结节的层到半连续到由锐边结合形成的连续层的结节）。结节）。

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