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首页> 外文学位 >Magnetostratigraphy of the Chinle and Moenkopi Strata Cored at Colorado Plateau Coring Project Site 1A Northern Petrified Forest National Park
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Magnetostratigraphy of the Chinle and Moenkopi Strata Cored at Colorado Plateau Coring Project Site 1A Northern Petrified Forest National Park

机译：科罗拉多高原取心项目地点1A北部石化森林国家公园的Chinle和Moenkopi地层的磁地层学

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摘要

The Triassic Period (ca. 251.9-201.3 Ma) is bounded by two of Earth's largest mass extinctions, suffered several giant bolide impacts and eruption of three large igneous provinces, and witnessed evolution of the main components of modern tetrapod communities, and yet has sparse geochronologic calibration. To remedy this problem, the US NSF- and ICDP-funded coring of Phase 1 of the CPCP was completed in late 2013, with the recovery of two major cores (6.35 cm diameter: 1A, 518m length and 2B, 253m; 31km apart) from the north and south ends of Petrified Forest National Park, spanning nearly the entire Triassic section (Chinle and Moenkopi formations.). Typically, multiple specimens were collected from the same core segments, to test for internal consistency of paleomagnetic and rock magnetic results, then subjected to progressive thermal demagnetization or a combination of alternating field (AF) followed by thermal treatment. For the mudstones, siltstones and sandstones of the Chinle Formation, NRM intensities are highly variable and range from 128.7 to 0.07 mA/m and bulk susceptibilities range from ∼ 2 x 10 -2 to ∼ 5 x 10-5 SI volume units. For indurated hematitic siltstones to medium grained sandstones of the Moenkopi Formation, NRM intensities are less variable and range from 0.05 to 53.01 mA/m and bulk susceptibilities are far less variable, with values between ∼3.0 X 10 -4 and ∼0.5 x 10-5 SI volume units. Progressive demagnetization of accepted specimens typically isolates magnetizations of north declination and shallow to moderate positive inclination (interpreted as normal polarity) and antipodes (reverse polarity). IRM acquisition and backfield demagnetization experiments demonstrate both hematite and magnetite as magnetic phases. An attempt was made to correlate current version of the CPCP 1A magnetostratigraphy with the astronomically tuned Newark Basin record.
机译：三叠纪（约251.9-201.3 Ma）以地球上两次最大的生物灭绝为界，遭受了几次巨大的火星撞击和三个大火成岩省的爆发，目睹了现代四足动物群落的主要组成部分演化，但仍然稀疏年代学校准。为了解决这个问题，由美国NSF和ICDP资助的CPCP第一阶段取芯工作于2013年底完成，回收了两个主要岩心（直径6.35厘米：1A，长度518m，长度2B，253m；相距31km）来自石化森林国家公园的南北两端，几乎覆盖了整个三叠纪地区（Chinle和Moenkopi地层）。通常，从同一铁心段中收集多个样本，以测试古磁和岩磁结果的内部一致性，然后进行渐进热退磁或交变场（AF）组合，然后进行热处理。对于Chinle组的泥岩，粉砂岩和砂岩，NRM强度变化很大，范围为128.7至0.07 mA / m，总磁化率范围为〜2 x 10 -2至〜5 x 10-5 SI体积单位。对于Moenkopi组的硬变质粉砂质粉砂岩至中粒砂岩，NRM强度变化较小，范围从0.05至53.01 mA / m，磁化率变化较小，其值介于〜3.0 X 10 -4和〜0.5 x 10-之间。 5 SI体积单位。接受标本的逐渐退磁通常会隔离北偏磁，浅至中度的正偏磁（解释为法向极性）和对极（反极性）的磁化强度。 IRM采集和后场退磁实验表明，赤铁矿和磁铁矿都是磁性相。试图将CPCP 1A地层学的最新版本与经天文调整的纽瓦克盆地记录相关联。

著录项

  • 作者

    Buhedma, Hesham M. A.;

  • 作者单位

    The University of Texas at Dallas.;

  • 授予单位 The University of Texas at Dallas.;
  • 学科 Geophysics.;Geology.
  • 学位 M.S.
  • 年度 2017
  • 页码 54 p.
  • 总页数 54
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 康复医学;
  • 关键词

  • 入库时间 2022-08-17 11:38:48

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