首页> 外文期刊>Micropaleontology >Miocene climatic oscillation recorded in the Lakes Entrance oil shaft, southern Australia: benthic foraminiferal response on a mid-latitude margin
【24h】

Miocene climatic oscillation recorded in the Lakes Entrance oil shaft, southern Australia: benthic foraminiferal response on a mid-latitude margin

机译:澳大利亚南部的莱克斯恩特伦斯入口油井中记录的中新世气候振荡:中纬度边缘的底栖有孔虫反应

获取原文
获取原文并翻译 | 示例
       

摘要

The Lakes Entrance oil shaft section in east Gippsland, southeastern Australia, spans most of the second-order rise and fall in sea level and climate known as the Miocene oscillation. For this section, we have established time series of taxic changes and relative abundances of benthic foraminifera. Metrics reflecting the Miocene oscillation are changes in the profiles of inner, middle and outer neritic species, infauna and epifauna, and first and last appearances of species, as well as the numerous intervening comings and goings. A paleodepth curve is derived from shifts in the dominance of ecological groups. The inferred pattern of transgression/regression shows good agreement with third-order sequences. The pattern of first and last appearances shows three levels of particular interest. Two major changes are close by correlation to second-order sequence boundaries, early in the early Miocene and at the middle/late Miocene boundary respectively. Whereas the planktonic succession peaks in all measures at the Miocene optimum, the equivalent but muted benthic peaking leads it by some 2 m.y., peaking at the beginning of the Monterey carbon excursion. Thus the neritic record is more in tune with the deep-ocean record than with the plankton, and we suggest that fluctuations in nutrient supply had their major impact on the rising side (early Miocene) of the Miocene oscillation.
机译:澳大利亚东南部吉普斯兰(Gippsland)东部的湖泊入口油井段,横跨海平面和中新世振荡的第二阶上升和下降的大部分。在本节中,我们建立了底栖有孔虫的税收变化和相对丰度的时间序列。反映中新世振荡的度量标准是内部,中部和外部新生物种类,动物群和表生动物的轮廓的变化,以及物种的最初和最后出现,以及众多的介入进出。古深度曲线是由生态群体的优势转移得出的。推断的海侵/回归模式与三阶序列显示出良好的一致性。首次出现和最后一次出现的模式显示出三个特别重要的层次。通过与中新世早期和中/晚中新世边界的二阶序列边界相关,两个主要变化是紧密相关的。浮游演替在所有尺度上都在中新世最佳时达到顶峰,但等效但无声的底栖峰使它领先约2 m.y.,在蒙特雷碳偏移开始时达到顶峰。因此,与早年海洋的浮游生物相比,晚泥世的海相记录更符合深海记录,我们认为养分供应的波动对中新世振荡的上升面(中新世早期)有重要影响。

著录项

相似文献

  • 外文文献
  • 中文文献
获取原文

客服邮箱:kefu@zhangqiaokeyan.com

京公网安备:11010802029741号 ICP备案号:京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有
  • 客服微信

  • 服务号