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首页> 外文期刊>Journal of Asian earth sciences >Constraints of magnetostratigraphic and mineralogical data on the provenance of sediments in the Parece Vela Basin of the western Pacific
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Constraints of magnetostratigraphic and mineralogical data on the provenance of sediments in the Parece Vela Basin of the western Pacific

机译：磁性数据库和矿物质学数据对西太平洋Parece Vela盆地沉积物的遗产

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摘要

The sediment provenance and sedimentary processes of the Parece Vela Basin in the western Pacific during the last ca. 1 Myr were studied based on the analysis of magnetic properties, mineral features, and paleomagnetic ages of core C-P19. The results show that the sedimentary sequence has a lower limit age younger than 1.072 Ma, and the sedimentation process can be divided into two stages with sedimentation rates of 4.0 mm/kyr during ca. 1-0.78 Ma and 3.6 mm/kyr since 0.78 Ma. These sedimentation rates are higher than those in the surrounding area, where the sedimentation rate is generally less than 2 mm/kyr. Taken together with the mineral features and magnetic parameters, these findings show that volcanic sediments eroded from the nearby ridge were transported by currents to the sampling site. These volcanic sediments represent the main source of sediment in the area, with eolian inputs contributing little and nonbiogenic authigenic magnetite accounting for part of the magnetic fraction. The sedimentary environment and sediment provenance have varied during the last approximately 1 million years. During 997-880 ka, volcanic activity increased, and the input of volcanic clasts was high, whereas during 880-443 ka, the sedimentary environment tended to be stable, and the sediment supply decreased. With the increase in volcanic activity in the western Pacific, the sediment input increased again during ca. 443 ka-present.
机译：在最后一个CA期间西太平洋普雷基·米兰盆地的沉积物源和沉积过程。根据磁性，矿物特征和核心C-P19的古磁性古代的分析研究了1 MYR。结果表明，沉积序列具有比1.072 mA较小的下限年龄较小，沉降过程可分为两个阶段，沉降速率为4.0毫米/ kyr。自0.78 mA以来，1-0.78 mA和3.6 mm / kyr。这些沉降率高于周围区域中的沉降率高，其中沉降率通常小于2mm / kyr。这些发现与矿物特征和磁性参数一起携带，表明从附近脊侵蚀的火山沉积物被对采样部位的电流运输。这些火山沉积物代表该地区的沉积物的主要来源，欧朗的投入有助于一些少量和非母性的AheriaNenic磁铁矿占磁性分数的一部分。在过去约100万年期间，沉积环境和沉积物出处变化。在997-880 ka期间，火山活度增加，火山碎石的输入高，而在880-443 ka期间，沉积环境趋于稳定，沉积物供应减少。随着西太平洋的火山活性增加，沉积物进入在加利福期间再次增加。 443 ka-invises。

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  • 来源
    《Journal of Asian earth sciences》 |2020年第jul1期|104373.1-104373.14|共14页
  • 作者

    Xiao Chunhui; Wang Yonghong; Lin Jian;

  • 作者单位

    Ocean Univ China MOE Key Lab Submarine Geosci & Prospecting Tech Qingdao 266100 Peoples R China|Ocean Univ China Coll Marine Geosci Qingdao 266100 Peoples R China|Qingdao Natl Lab Marine Sci & Technol Lab Marine Geol & Environm Qingdao 266237 Peoples R China;

    Ocean Univ China MOE Key Lab Submarine Geosci & Prospecting Tech Qingdao 266100 Peoples R China|Ocean Univ China Coll Marine Geosci Qingdao 266100 Peoples R China|Qingdao Natl Lab Marine Sci & Technol Lab Marine Geol & Environm Qingdao 266237 Peoples R China;

    Woods Hole Oceanog Inst Woods Hole MA 02543 USA|Chinese Acad Sci South China Sea Inst Oceanol Guangzhou 510301 Peoples R China;

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  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    Parece Vela Basin; Sediment provenance; Sedimentary process; Paleomagnetic age; Environmental magnetism;

    机译：Parece Vela Basin;沉积物源;沉积过程;古磁性时代;环境磁力;

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