Oligocene-Miocene calcareous nannofossil biostratigraphy and paleoecology from the Iberia abyssal plain
Oligocene-Miocene calcareous nannofossil biostratigraphy and paleoecology from the Iberia abyssal plain
复制标题
伊比利亚深海平原渐新世-中新世钙质超微化石生物地层学和古生态学
DOI：
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发表时间：
1996
期刊：
影响因子：
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通讯作者：
Villa Giuliana
中科院分区：
文献类型：
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作者：
D. Eric;Villa Giuliana
在海洋钻探计划 (ODP) 第 149 段期间，在大西洋东北部的伊比利亚深渊平原上钻探了五个地点。中生代和新生代沉积物均已恢复。在深水位点 897、898、899 和 900 处对渐新世至中新世沉积物进行了取芯。除少数间隔外，普遍存在丰富且保存完好的钙质超微化石，表明浊积岩型沉积物的沉积发生在方解石补偿深度 (CCD) 以上。中新世中晚期存在一处主要不整合面。对钙质纳米化石的详细定量分析用于确定纳米植物群中发生的与海平面变化相关的变化。通过结合伊比利亚深海平原研究的四个地点的生物地层学结果，定义了从渐新世早期到中新世晚期的一系列 89 个生物地层。描述了一个新属和八个新种：Camuralithus、Camuralithus pelliculatus、Ericsonia detectora、Helicosphaera limasera、Sphenithus akropodus、Sphenithus aubryae、Sphenithus cometa、Reticulofenestra circus 和 Syracosphaera lamina。还推出了两种新变体和七种新组合。
During Ocean Drilling Program (ODP) Leg 149, five sites were drilled on the Iberia Abyssal Plain in the northeastern Atlantic Ocean. Both Mesozoic and Cenozoic sediments were recovered. Oligocene to Miocene sediments were cored at deepwater Sites 897, 898, 899, and 900. Except for a few intervals, occurrences of generally abundant and well-preserved calcareous nannofossils suggest that the deposition of the turbidite-type sediments occurred above the calcite compensation depth (CCD). One major unconformity in the middle late Miocene is present. Detailed quantitative analyses of calcareous nannofossils are used to determine the changes occurring among the nannoflora in relation to sea-level variation. A succession of 89 biohorizons from the early Oligocene to the late Miocene are defined by combining the biostratigraphic results of the four sites studied in the Iberia Abyssal Plain. One new genus and eight new species are described: Camuralithus, Camuralithus pelliculatus, Ericsonia detecta, Helicosphaera limasera, Sphenolithus akropodus, Sphenolithus aubryae, Sphenolithus cometa, Reticulofenestra circus, and Syracosphaera lamina. Two new variations and seven new combinations are also introduced.