首页> 外文期刊>Journal of the Geological Society of India >Changes in seawater Sr-87/Sr-86 curve during early Miocene to early late Miocene: Implications of ODP site 758A record
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Changes in seawater Sr-87/Sr-86 curve during early Miocene to early late Miocene: Implications of ODP site 758A record

机译:中新世早期至中新世早期后期海水Sr-87 / Sr-86曲线的变化:ODP站点758A记录的含义

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摘要

A seawater Sr-87/Sr-86 record is generated for early Miocene to early late Miocene based on measurements of 114 samples of cleaned planktonic foraminifera from Ocean Drilling Program site 758 (Hole 758A) in the eastern Indian Ocean. Age model for this Site is based on nannofossil events and interpolated numerical ages are compared with Sr isotopically-derived ages. There is a fairly good agreement between the two stratigraphic tools (< +/- 1.5 Ma). Sr-87/Sr-86 ratio during similar to23.7 Ma to similar to8.1 Ma increased from 0.7081-8 to 0.70895, with variations in the rate of Sr-87/Sr-86 increase. Seventh-order polynomial fit curve shows the Sr-87/Sr-86 increase rates of 44 x 10(-6) m.y.(-1) for -23.7 to - 19.2 Ma, 41 x 10(-6) m.y.(-1) for similar to18.2 to similar to10.8 Ma, and 25 x 10(-6) m.y(.-)1 for similar to10.8 to similar to8.1 Ma. These rates are broadly consistent with the growth rates of Sr-87/(86) Sr reported from other DSDP and ODP sites with some minor differences.A composite Sr isotope curve constructed for the 24-8 Ma is broken into three linear segments with a different linear regression equation. The overall rate of Sr-87/Sr-86 increase for similar to24-8 Ma at site 758A (40 x 10(-6) m.y.(-1)) is in agreement with the rate of Sr-87/Sr-86-increase of the composite curve (42 x 10(-6) m.y.(-1)).
机译:根据对印度洋东部海洋钻探计划站点758(孔758A)的114个清洁浮游有孔虫样品的测量,生成了中新世早期至中新世早期的海水Sr-87 / Sr-86记录。该站点的年龄模型基于纳米化石事件,并将插值的数字年龄与Sr同位素衍生的年龄进行了比较。两种地层工具(<+/- 1.5 Ma)之间有很好的一致性。 Sr-87 / Sr-86比值在23.7 Ma到8.1Ma左右从0.7081-8增加到0.70895,且Sr-87 / Sr-86的比率增加。七阶多项式拟合曲线显示-23.7至-19.2 Ma,41 x 10(-6)my(-1)的Sr-87 / Sr-86增长率为44 x 10(-6)my(-1)相似于18.2至相似于10.8 Ma,25 x 10(-6)my(.-)1相似于10.8至相似于8.1 Ma。这些速率与其他DSDP和ODP站点报告的Sr-87 /(86)Sr的增长率基本一致,但有一些细微差别。针对24-8 Ma构建的复合Sr同位素曲线分为三个线性段,具有不同的线性回归方程。 Sr-87 / Sr-86的总体增加速率类似于758A站点上的24-8 Ma(40 x 10(-6)my(-1))与Sr-87 / Sr-86-的速率一致复合曲线的增加(42 x 10(-6)my(-1))。

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