Full Vector Studies of the Pringle Falls Excursion Recorded at Pringle Falls, Oregon

俄勒冈州普林格尔瀑布记录的普林格尔瀑布游览的完整矢量研究

• 批准号: 1215070
• 负责人: Emilio Herrero-Bervera
• 金额: $ 10.82万
• 依托单位: University of Hawaii
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2012
• 资助国家: 美国
• 起止时间: 2012-07-01 至 2015-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1215070&HistoricalAwards=false
• 关键词: Full; Vector; Studies; Pringle; Falls

The main objective of this proposal is to investigate the relative paleointensity of the lake sediments that recorded the Pringle Falls excursion (ca. 218+/-1o ka) at the original site of Pringle Falls along the Deschutes River in Oregon. Paleomagnetic directions (i.e. Declination and Inclination) as well as the relative paleointensity (i.e. Full Vector) from the Pringle Falls sediments will provide information on the spatial and temporal variability of the Earth's geomagnetic field for the well documented aborted reversal at Pringle Falls which duration is of few hundred years. Due to the fact that there is a real need to obtain detailed records from high-resolution sediments (i.e. high sedimentation rates, at least 10cm/year) in order to have a better understanding of the generation of the field, we propose to study in detail five sections sampled along the Deschutes River with the main objective of understanding the directional behavior as well as the geomagnetic field strength (i.e. relative paleointensity of the sections) recorded before during and after the Pringle Falls excursion in Oregon.The objectives of this proposed study are primarily related to the knowledge of the paleofield variations during periods like reversals and excursions, and the critical time intervals that precede and follow the high resolution (i.e. at least 10 cm/year of sedimentation rates) Pringle Falls excursion (recorded in Oregon) that so far have only been documented from a few sedimentary sequences particularly between 30 to 220 thousand years of the geomagnetic history. Reversal and excursion studies cannot be separated from the surrounding polarity intervals and most records published so far were not long enough to provide complete information. The lacustrine sediments along the Deschutes River sections offer the first exceptional opportunity to document field changes over a time period thatincludes a polarity episode that lasted a few hundred to, at most, several thousand years, and thus document the field behavior over various time constants. The results of the rock magnetic tests/experiments performed on pilot samples indicate that the sediments in question are suitable for the relative paleointensity studies proposed here. The magnetic results of this proposed research will contribute to the understanding of the structure in the core of the Earth, the core-mantle and the inner and outer core boundaries as well as the related causes of the generation of the Earth's magnetic field.

这项建议的主要目的是调查记录普林格尔福尔斯漂移的湖泊沉积物的相对古强度（约1000年）。在俄勒冈州德舒特河沿岸的普林格尔福尔斯沿着的原始地点。来自普林格尔福尔斯沉积物的古地磁方向（即，倾角和倾角）以及相对古强度（即，全矢量）将提供关于地球地磁场的空间和时间变化的信息，用于在普林格尔福尔斯进行的有据可查的中止反转，其持续时间为几百年。由于真实的需要从高分辨率沉积物中获得详细的记录（即高沉降率，至少10厘米/年），以便更好地了解该领域的产生，我们建议对沿着德舒特河沿着取样的五个断面进行详细研究，主要目的是了解方向行为和地磁场强度（即剖面的相对古强度）在俄勒冈州普林格尔福尔斯漂移之前、期间和之后记录。这项拟议研究的目的主要是了解在反转和漂移等时期的古场变化，以及在高分辨率之前和之后的关键时间间隔（即，至少10 cm/年的沉积速率）普林格尔福尔斯漂移（记录在俄勒冈州），迄今为止仅从少数沉积序列中记录，特别是在地磁历史的3万至22万年之间。返回和偏移研究不能与周围的极性间隔分开，迄今为止发表的大多数记录都不够长，无法提供完整的信息。湖相沉积物沿着德舒特河部分提供了第一个特殊的机会，记录字段的变化，在一个时间段，其中包括一个极性插曲，持续了几百年，最多，几千年，从而记录字段的行为在不同的时间常数。岩石磁性测试/实验的结果进行试点样品表明，沉积物的问题是适合的相对古强度研究在这里提出的。这一研究结果将有助于了解地球的核心结构，核幔和内外核边界以及地球磁场产生的相关原因。