Time Scale Controversy: accurate orbital calibration of the late Miocene

时标争议：中新世晚期的精确轨道校准

• 批准号: 242225091
• 负责人: Dr. Thomas Westerhold
• 金额: --
• 依托单位: College of Earth, Ocean, and Atmospheric Sciences
• 依托单位国家: 德国
• 项目类别: Infrastructure Priority Programmes
• 财政年份: 2013
• 资助国家: 德国
• 起止时间: 2012-12-31 至 2016-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/242225091?language=en
• 关键词: Time; Scale; Controversy; accurate; orbital

The objective of the project is to investigate potential intrinsic problems with the rock clock synchronization between radio-isotopic and astronomic dating techniques. We hypothesize that the tuning of ash layers in the late Miocene Mediterranean sections (Sorbas, Faneromeni, Messadit, etc.; located in magnetochrons C3An.2n, C3.Ar and C3Bn) used for the synchronization is incorrect by 2-3 precession cycles (40-60 kyr). To test this hypothesis, we are developing a very accurate, astronomically calibrated late Miocene time scale for magnetic polarity Chrons C3An.1n (6 Ma) to C4n.1n (7.5 Ma) (including C3An.2n, C3.Ar and C3Bn) using three ODP/IODP sites outside the Mediterranean (926, U1337, U1338). During the first phase of the project, preliminary interpretation of new magnetostratigraphic data acquired at Site U1337 allowed identification of fourteen geomagnetic reversals, of which eight reversal positions have been located with very high confidence. The remaining six reversal positions, including Chron C3Bn, still need further analyses. The samples for the stable isotope stratigraphy analyzed so far contain sufficient benthic foraminifera to generate an isotopic record suitable for astronomical tuning. The main goal of this extension proposal is to exactly pinpoint the position of six key reversals and extend the high-resolution benthic stable isotope record at Site U1337, and fill gaps located in isotope records from ODP Sites 982 and 1264. All records will be integrated to generate a high-resolution, astronomically tuned benthic stable oxygen isotope stack between 5.2-8.2 Ma to provide a global stratigraphic reference section for the late Tortonian and Messinian. High-resolution paleoceanographical reconstructions based on the envisaged benthic stable oxygen and carbon isotope records will allow resolving of outstanding late Miocene paleoclimate questions. The paleoceanographic reconstructions based on our new data need to be accompanied by investigations evaluating how the primary benthic isotope signal is affected by secondary diagenetic alterations, and analytical and natural sample variability.

该项目的目的是研究放射性异位和天文数字技术之间岩石时钟同步的潜在内在问题。我们假设在中新世地中海晚期（Sorbas，Faneromeni，Messadit等）中灰层的调整；位于Magnetochrons C3AN.2N.2N，C3.AR和C3BN和C3BN和C3BN）中使用了2-3个prevession Cimles（40-60-60 kyr）。 To test this hypothesis, we are developing a very accurate, astronomically calibrated late Miocene time scale for magnetic polarity Chrons C3An.1n (6 Ma) to C4n.1n (7.5 Ma) (including C3An.2n, C3.Ar and C3Bn) using three ODP/IODP sites outside the Mediterranean (926, U1337, U1338).在该项目的第一阶段，对位于U1337的现场获得的新磁层数据的初步解释允许鉴定14个地磁逆转，其中八个逆转位置以很高的置信度找到。其余的六个逆转位置，包括Chron c3亿，仍然需要进一步的分析。到目前为止分析的稳定同位素地层的样品包含足够的底栖有孔虫，以产生适合天文调节的同位素记录。该扩展建议的主要目标是精确地指出了六个关键逆转的位置，并扩展了站点U1337处的高分辨率底栖稳定同位素记录，并填补位于ODP站点982和1264的同位素记录中的空白。已故托尔顿人和墨西鸟人的参考部分。基于所设想的底栖稳定氧和碳同位素记录的高分辨率古环数重建将允许解决中新世晚期古气候问题。基于我们的新数据的古环摄影重建需要伴随研究，以评估原发性底栖同位素信号如何受到次化成岩作用改变以及分析和自然样品变异性的影响。

项目成果

Revisiting the Ceara Rise, equatorial Atlantic Ocean: isotope stratigraphy of ODP Leg 154 from 0 to 5 Ma

重访赤道大西洋塞阿拉隆起：ODP Leg 154 0 至 5 Ma 的同位素地层学

• DOI: 10.5194/cp-13-779-2017
• 发表时间: 2017
• 期刊: Climate of The Past
• 影响因子: 4.3
• 作者: Wilkens;Westerhold;Gorgas
• 通讯作者: Gorgas

International Ocean Discovery Program Expedition 363 Preliminary Report Western Pacific Warm Pool Neogene and Quaternary records of Western Pacific Warm Pool paleoceanography

• DOI: 10.14379/iodp.pr.363.2017
• 发表时间: 2017-02
• 作者: Y. Rosenthal;A. Holbourn;D. Kulhanek;I. Aiello;T. Babila;G. Bayon;L. Beaufort;S. C. Bova;J.-H. Chun;H. Dang;A. Drury;T. Jones;P. Eichler;A.G.S. Fernando;K. Gibson;R. Hatfield;Dan M. Johnson;Y. Kumagai;B. Linsley;N. Meinicke;G. Mountain;B. Opdyke;P. Pearson;C. R. Poole;A. Ravelo;T. Sagawa;A. Schmitt;J. B. Wurtzel;Jian Xu;Masanobu Yamamoto;Yi Zhang