Schizosphaerella – Relation to sea-level, the carbonate factory and palaeoenvironmental change from the Sinemurian to earliest Toarcian of the Paris Basin">

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首頁> 外文期刊>Palaeogeography, Palaeoclimatology, Palaeoecology: An International Journal for the Geo-Sciences >Abundance and size changes in the calcareous nannofossil Schizosphaerella – Relation to sea-level, the carbonate factory and palaeoenvironmental change from the Sinemurian to earliest Toarcian of the Paris Basin
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Abundance and size changes in the calcareous nannofossil Schizosphaerella – Relation to sea-level, the carbonate factory and palaeoenvironmental change from the Sinemurian to earliest Toarcian of the Paris Basin

機譯：鈣質Nannofossil的豐富和大小變化 schizosphaerella - 與海平面，碳酸鹽廠和古老的山地養(yǎng)老師的變化發(fā)生在巴黎盆地最早的Toarcian

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AbstractAbundance and size changes in the calcareous nannofossilSchizosphaerellaare investigated throughout the upper Sinemurian to lowermost Toarcian of the Sancerre-Couy core (Paris Basin). Measurements from 116 samples are compared to 487 and 411 measurements of CaCO3content and total organic carbon (TOC) content, respectively. Our results confirm thatSchizosphaerellawas better adapted to proximal areas than coccoliths as expressed by the stepwise rise in abundance ofSchizosphaerella, followed later on by the rise in abundance of coccoliths during the major transgression of the Sinemurian. The new results show that changes in the size ofSchizosphaerellawere mostly a response to Early Jurassic temperature variations (coldhouse-greenhouse changes). Large average sizes ofSchizosphaerellacorrespond mostly to proximal, cool environmental conditions of the late Sinemurian. Medium average sizes correspond to more distal conditions and cool surface waters whereas small average sizes are associated with warm episodes. These results suggest that the size response ofSchizosphaerellato the early Toarcian Oceanic Anoxic Event and to preceding environmental perturbations of the Early Jurassic was probably not a physiological response to lower calcification but rather represent changes in abundances of different ecophenotypes or (sub-)species related to climate change.The contribution ofSchizosphaerellacarbonate (CaCO3schizo
機譯：<！[cdata [ 抽象 鈣質Nannofossil中的豐度和大小變化 Schizosphaerella 在整個方面進行了調查上僧人到斯坎德爾 - Couy核心（巴黎盆地）的下索拉克。將116個樣品的測量值與Caco 3分別的487和411測量值分別為487和411測量。我們的結果證實鞘育耳更好地適應近端區(qū)域，而不是逐步升高的COCColiths，如逐步升高的 schizosphaerella ，后來僧漿期重大侵犯中的豐富葡萄糖的興起。新結果表明，schizαerella大多是對早期侏羅紀溫度變化的反應（Coldouse-溫室變化）。較大的平均尺寸 schizosphaerella 大多數對應于初學者晚期的近端，涼爽的環(huán)境條件。介質平均尺寸對應于更多遠端條件和冷表面水，而小的平均尺寸與熱發(fā)作相關。這些結果表明 schizosphaerella 對早期侏羅紀的早期環(huán)境擾動的尺寸反應可能不是對鈣化降低的生理反應，而是表示變化與氣候變化有關的不同生態(tài)型或（子）物種的豐富。 schizosphaerella的貢獻< / CE：斜體>碳酸鹽（Caco 3SCHIZO

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