16. OXYGEN- AND CARBON-ISOTOPE VARIATIONS AND PLANKTONIC-FORAMINIFER DEPTH HABITATS, LATE CRETACEOUS TO PALEOCENE, CENTRAL PACIFIC, DEEP SEA DRILLING PROJECT SITES 463 AND 465
16. OXYGEN- AND CARBON-ISOTOPE VARIATIONS AND PLANKTONIC-FORAMINIFER DEPTH HABITATS, LATE CRETACEOUS TO PALEOCENE, CENTRAL PACIFIC, DEEP SEA DRILLING PROJECT SITES 463 AND 465
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16. 中太平洋、深海钻探项目地点白垩纪晚期至古新世的氧和碳同位素变化以及浮游有孔虫深度栖息地 463 和 465
DOI：
10.2973/dsdp.proc.62.116.1981
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发表时间：
2006
期刊：
影响因子：
--
通讯作者：
N. Shackleton
中科院分区：
文献类型：
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作者：
A. Boersma;N. Shackleton
这项研究的目的是测量太平洋上白垩统上部以及白垩纪/古近纪界线处的碳、氧同位素比值（图1）。选择深海钻探计划465站是因为其白垩纪动物群保存良好至非常好，并且有一个保存极为完好、长100厘米的古近纪最早期的“真抱球虫”始新世乌格宾纳带。在保存条件允许的情况下，也对463站较长的剖面进行了测量。我们对从土仑阶到马斯特里赫特阶的上白垩统进行了普查测量（每个浮游生物带测量一次），并对穿过白垩纪/古近纪界线到早期“真抱球虫”始新世乌格宾纳带进行了采样。样本根据范欣特（1976）对白垩纪的划分以及普雷莫利 - 席尔瓦和博利（1975）对古新世的划分进行了分层。对按大小分级的浮游有孔虫进行了单一物种样本测量，对底栖有孔虫进行了单一和多种物种样本测量。沙克尔顿的方法在沙克尔顿和奥普戴克（1974）的文献中有描述。我们假设氧同位素比值记录了这一时期的温度，并且在转换为温度时对标准平均大洋水（SMOW）进行了1.00‰的校正。利用最负的浮游生物氧同位素值构建了近地表古温度曲线。
The purpose of this study was to measure the carbonand oxygen-isotope ratios through the upper Cretaceous and across the Cretaceous/Tertiary boundary in the Pacific Ocean (Fig. 1). Deep Sea Drilling Project Site 465 was chosen because of the good to very good preservation of its Cretaceous faunas and a very well-preserved, 100-cm-long, earliest Tertiary "Globigerina" eugubina Zone. The longer section at Site 463 was also measured, where preservation permitted. We made reconnaissance measurements (one per planktonic zone) of the upper Cretaceous from the Turonian through the Maastrichtian. Sampling across the Cretaceous/Tertiary boundary through the early "G. "eugubina Zone. Samples were zoned according to the zonation of van Hinte (1976) for the Cretaceous, and Premoli-Silva and Bolli (1975) for the Paleocene. Unispecific samples of size-graded planktonic foraminifers and uniand multispecific samples of benthic foraminifers were measured. Methods of Shackleton are described in Shackleton and Opdyke (1974). We assumed that the oxygen-isotope ratio records temperature through this time, and we made a correction of 1 .OO%o to SMOW when converting to temperature. The most negative oxygen-isotope planktonic value is used to construct near-surface paleotemperature curves.