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首页> 外文期刊>Paleoceanography >Global change across the Oligocene-Miocene transition: High-resolution stable isotope records from IODP Site U1334 (equatorial Pacific Ocean)
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Global change across the Oligocene-Miocene transition: High-resolution stable isotope records from IODP Site U1334 (equatorial Pacific Ocean)

机译：渐新世-中新世过渡期间的全球变化：来自IODP站点U1334（赤道太平洋）的高分辨率稳定同位素记录

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摘要

The Oligocene-Miocene transition (OMT) (similar to 23Ma) is interpreted as a transient global cooling event, associated with a large-scale Antarctic ice sheet expansion. Here we present a 2.23Myr long high-resolution (similar to 3kyr) benthic foraminiferal oxygen and carbon isotope (O-18 and C-13) record from Integrated Ocean Drilling Program Site U1334 (eastern equatorial Pacific Ocean), covering the interval from 21.91 to 24.14Ma. To date, five other high-resolution benthic foraminiferal stable isotope stratigraphies across this time interval have been published, showing a similar to 1 increase in benthic foraminiferal O-18 across the OMT. However, these records are still few and spatially limited and no clear understanding exists of the global versus local imprints. We show that trends and the amplitudes of change are similar at Site U1334 as in other high-resolution stable isotope records, suggesting that these represent global deep water signals. We create a benthic foraminiferal stable isotope stack across the OMT by combining Site U1334 with records from ODP Sites 926, 929, 1090, 1264, and 1218 to best approximate the global signal. We find that isotopic gradients between sites indicate interbasinal and intrabasinal variabilities in deep water masses and, in particular, note an offset between the equatorial Atlantic and the equatorial Pacific, suggesting that a distinct temperature gradient was present during the OMT between these deep water masses at low latitudes. A convergence in the O-18 values between infaunal and epifaunal species occurs between 22.8 and 23.2Ma, associated with the maximum O-18 excursion at the OMT, suggesting climatic changes associated with the OMT had an effect on interspecies offsets of benthic foraminifera. Our data indicate a maximum glacioeustatic sea level change of similar to 50m across the OMT.
机译：渐新世-中新世转变（OMT）（类似于23Ma）被解释为短暂的全球性冷却事件，与南极冰盖的大规模扩张有关。在这里，我们从综合海洋钻探计划站点U1334（赤道东太平洋）提供了一个2.23毫米长的高分辨率（类似于3kyr）底栖有孔虫的氧气和碳同位素（O-18和C-13）记录，覆盖的时间间隔为21.91至24.14Ma。迄今为止，已经发布了该时间间隔内的其他五种高分辨率底栖有孔虫稳定同位素地层，显示整个OMT底栖有孔虫O-18的增加量接近1。但是，这些记录仍然很少，而且在空间上也很有限，对全局烙印和局部烙印没有清楚的了解。我们显示，站点U1334的趋势和变化幅度与其他高分辨率稳定同位素记录中的相似，表明它们代表了全球深水信号。通过将站点U1334与来自ODP站点926、929、1090、1264和1218的记录相结合，可以在OMT上创建底栖有孔虫稳定同位素堆栈，以最好地近似全局信号。我们发现站点之间的同位素梯度表明深水物质的基底间和基底内变异，特别是注意到赤道大西洋和赤道太平洋之间存在偏移，这表明在OMT期间这些深水物质之间存在明显的温度梯度。低纬度。霉菌和表皮真菌之间O-18值的收敛发生在22.8和23.2Ma之间，这与OMT处的最大O-18偏移有关，这表明与OMT相关的气候变化对底栖有孔虫的种间偏移有影响。我们的数据表明，整个OMT的最大冰川恒流海平面变化接近50m。

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