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首页> 外文期刊>Earth and Planetary Science Letters: A Letter Journal Devoted to the Development in Time of the Earth and Planetary System >Holocene paleomagnetic secular variation records from the western Equatorial Pacific Ocean
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Holocene paleomagnetic secular variation records from the western Equatorial Pacific Ocean

机译：赤道西太平洋全新世古磁长期变化记录

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We have carried out detailed rock magnetic and paleomagnetic studies on a suite of four deep-sea sediment cores from Indonesia and the Philippine Islands, which form a transect from 6.3 degrees N to 10.6 degrees S. The cores have average sediment accumulation rates of 35-65 cm/kyr that all yield high-resolution paleomagnetic secular variation (PSV) records. The PSV records contain 44 correlatable inclination and declination features that corroborate the individual PSV records and indicate that they are all continuous with no significant stratigraphic gaps. Thirty-four AMS radiocarbon dates provide a high-resolution time stratigraphic framework for the PSV records, which extend from similar to 0-18,000 yrs BP. These are the first high-resolution Holocene PSV records ever recovered from anywhere on Earth within 17 degrees of the Equator (almost 1/3 of the Earth's surface area). Statistical analysis of the Holocene PSV records indicates that they have Delta I anomalies of -5 degrees to -9 degrees, consistent with 5 MA averaged results. The strong similarity in Delta I anomaly pattern of Holocene and longer-term (5 Ma) averaged PSV data suggest that the dynamo process causing the anomaly is largely described by Holocene PSV By contrast, the Holocene PSV records have VGP angular dispersions that are significantly lower than 5 MA averaged PSV data yet significantly higher than PSV data averaged over only the last few thousand years. This difference indicates that whatever dynamo process causes the overall directional variability of the Earth's magnetic field is not totally described by recent (last few thousand year) PSV or even by late Quaternary (last 20,000 yrs) PSV (c) 2006 Elsevier B.V. All rights reserved.
机译：我们对一组来自印度尼西亚和菲律宾群岛的四个深海沉积岩心进行了详细的岩石磁和古磁研究，这四个岩心形成了北纬6.3度到南南10.6度的断面。岩心的平均沉积速率为35- 65 cm / kyr均可产生高分辨率的古磁长期变化（PSV）记录。 PSV记录包含44个相关的倾斜和偏角特征，这些特征证实了各个PSV记录并表明它们都是连续的，没有明显的地层学空白。 34个AMS放射性碳日期为PSV记录提供了高分辨率的时间地层框架，从BP到0-18,000年。这是有史以来从赤道17度（几乎是地球表面积的1/3）以内的任何地方恢复的高分辨率全新世PSV记录。全新世PSV记录的统计分析表明，它们的Delta I异常为-5度到-9度，与5 MA平均结果一致。全新世的Delta I异常模式与长期（5 Ma）平均PSV数据的强烈相似性表明，导致该异常的发电机过程主要由全新世PSV描述。相比之下，全新世PSV记录的VGP角色散明显更低不到5 MA的平均PSV数据，但仅比过去几千年来的PSV数据高得多。这种差异表明，任何发电机过程导致地球磁场的整体方向变化，最近（过去几千年）的PSV甚至不是第四纪后期（最近20,000年）的PSV（c）2006 Elsevier BV都没有完全描述。 。

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