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首页> 外文期刊>Facies >Thin-shelled bivalve buildup of the lower Bajocian, South Iberian paleomargin: development of opportunists after oceanic perturbations
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Thin-shelled bivalve buildup of the lower Bajocian, South Iberian paleomargin: development of opportunists after oceanic perturbations

机译：薄壳的双峰堆积较低的Bajocian，South Iberian Paleomargin：海洋扰动后的机会主义者的发展

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摘要

An exceptional buildup of thin-shelled bivalves (3.5 m thick and more than 12 m long), apparently the largest in the literature, is reported from the External Subbetic (Betic Cordillera, southern Spain). Calcareous nannofossils indicate the NJT8 biozone (late Aalenian) below the buildup and the NJT9 biozone (early Bajocian) at the base of the buildup. The thin-shelled bivalves, commonly referred to as filaments, are Bositra-like forms, an opportunistic bivalve that flourished under stressed conditions. Geochemical proxies (carbon isotopes, P-org and Ba-bio, and Cr/Al, V/Al and Ni/Co ratios) indicate that the marine environment was subjected to changes in oxygenation and trophic conditions, which, under the optimum states, promoted extremely high rates of production of the thin-shelled bivalves. The large buildup accumulated on the sea-floor under favorable hydrodynamic conditions and local topography. The significance of these depositional characteristics in relation to the previous literature is discussed.
机译：从外部血统计（Betic Cordillera，Southern South South South）报道，薄壳纤维纤维纤维纤维纤维纤维纤维纤维纤维纤维纤维纤维纤维纤维纤维纤维纤维纤维（3.5米厚，超过12米）。钙质Nannofossils表示NJT8 Biozone（晚期Aalenian）下方的底层和NJT9 Biozone（早期Bajocian）。通常称为长丝的薄壳双抗壳，是类似Bostra的形式，在压力条件下繁荣的机会纤维植物。地球化学术代理（碳同位素，P-ORG和BA-BIO，以及Cr / Al，V / Al和Ni / Co比率）表明海洋环境受到氧合和营养疾病的变化，其中在最佳状态下，促进了极高的薄壳双抗体生产率。在良好的流体动力学条件和局部地形下，海底积累的大堆积。讨论了这些沉积特征关于先前文献的重要性。

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