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首页> 外文期刊>Journal of nannoplankton research: A publication of the International Nannoplankton Association >Middle Miocene Carbonate Crash in the Niger Delta: Evidence from Calcareous Nannofossils
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Middle Miocene Carbonate Crash in the Niger Delta: Evidence from Calcareous Nannofossils

机译：尼日尔三角洲中新世中期碳酸盐岩崩塌：来自钙质纳米化石的证据

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摘要

Analysis of the Serravallian calcareous nannofossils from eight Niger Delta deep offshore wells shows, for the first time, evidence of the Middle Miocene carbonate crash from the Gulf of Guinea. These nannofossil-poor sediments provide very low biostratigraphic resolution and preclude a refined biozonation for the interval in this region. Evidence of such poor preservation of calcium carbonate microfossils (mainly foraminifera and nannofossils) in the Middle Miocene is widespread in the eastern equatorial Pacific Ocean, where the term 'carbonate crash' was first used. The carbonate crash has also been identified from the Caribbean, Atlantic and Indian oceans. With the recognition of the event in the Gulf of Guinea, it could be said to be a global phenomenon. The carbonate crash, as observed in the studied Niger Delta wells, spans the interval of nannofossil zones NN5 to NN8. The event has been documented between zones NN5 and NN10 in other regions of the world. The overlap in time and the nature of the crash in the Gulf of Guinea is comparable with reports from other parts of the world, suggesting a common cause as responsible for the crash.
机译：对来自尼日尔三角洲深海八口井的塞拉瓦尔钙质纳米化石的分析首次显示了几内亚湾中新世中部碳酸盐岩崩塌的证据。这些稀少的纳米化石沉积物提供了非常低的生物地层分辨率，并且在该区域的间隔内无法进行精细的生物分区。在中新世中期，碳酸钙微化石（主要是有孔虫和纳米化石）的这种保存不力的证据在赤道东太平洋普遍存在，最早使用的是“碳酸盐崩溃”一词。在加勒比海，大西洋和印度洋也发现了碳酸盐岩崩塌。随着几内亚湾事件的确认，这可以说是一种全球现象。在研究的尼日尔三角洲油井中观察到的碳酸盐岩崩塌跨越了纳米化石区NN5至NN8的间隔。该事件已记录在世界其他地区的NN5和NN10区之间。时间的重叠和几内亚湾坠机的性质可与世界其他地区的报道相提并论，这表明造成坠机的原因是共同的。

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