Paleotemperature Analysis of Caribbean Cores P6304-8 and P6304-9 and a Generalized Temperature Curve for the past 425,000 Years
Paleotemperature Analysis of Caribbean Cores P6304-8 and P6304-9 and a Generalized Temperature Curve for the past 425,000 Years
复制标题
加勒比核心 P6304-8 和 P6304-9 的古温度分析以及过去 425,000 年的广义温度曲线
DOI：
--
复制
发表时间：
1966
期刊：
影响因子：
--
通讯作者：
C. Emiliani
中科院分区：
文献类型：
--
作者：
C. Emiliani
用于制备用于质谱分析的有机碳酸酯的不同技术可能会给出略微不同的结果，这取决于所使用的材料和其被减小的粒度。对加勒比中部的两个深海岩心进行了分析。一个岩心的样品已经过真空焙烧处理，另一个岩心的样品没有焙烧。这两组结果相似，并且与已经研磨成粉末并在氦气流中烘烤的样品相差0.5‰。当使用远洋有孔虫时，没有焙烧和真空焙烧似乎产生的同位素结果比氦焙烧获得的结果更接近真实温度。通过几种不同的标准将分析的两个岩心和先前描述的其他岩心相关联。这种相关性产生了一条从现在延伸到425，000年前的广义温度曲线。在深海岩心同位素温度最低值的地层位置和在北纬65度的米兰科维奇日射最低值的年龄之间观察到的高度（0.997）的直接相关性。为基于“米兰科维奇机制”的冰川作用理论提供了强有力的支持，并表明，如果在一个或多个温度阶段取平均值，在过去几十万年中，海洋沉积的总体速率基本保持不变。
Different techniques for preparing organic carbonates for mass spectrometric analysis may give slightly different results depending upon the material used and the grain size to which it is reduced. Two deep-sea cores from the central Caribbean have been analyzed. The samples from one core have been treated with vacuum roasting, and the samples from the other core have not been roasted. The two sets of results are similar and differ 0.5‰ from samples that have been ground to powder and roasted in a stream of helium. When using pelagic Foraminifera, no roasting and vacuum roasting appear to yield isotopic results slightly closer to the true temperature than the results obtained with helium roasting. The two cores analyzed and others previously described are correlated by means of several different criteria. This correlation yields a generalized temperature curve which extends from the present to 425,000 years ago. The high (.997), direct correlation observed between the stratigraphic positions of the isotopic temperature minima in deep-sea cores and the ages of the Milankovitch insolation minima at 65° N. provides strong support for theories of glaciation based on the "Milankovitch mechanism" and indicates that the over-all oceanic rate of sedimentation, if averaged across one or more temperature stages, remained essentially constant during the past several hundred thousand years.