Paleomagnetism of the upper Keweenawan sediments: the Nonesuch Shale and Freda Sandstone
Paleomagnetism of the upper Keweenawan sediments: the Nonesuch Shale and Freda Sandstone
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Keweenawan 上部沉积物的古地磁：Nonesuch 页岩和 Freda 砂岩
DOI：
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发表时间：
1977
期刊：
影响因子：
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通讯作者：
R. Voo
中科院分区：
文献类型：
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作者：
S. Henry;F. Mauk;R. Voo
采用热、交变场和化学退磁技术对上部 Keweenawan Nonesuch 页岩和 Freda 砂岩的天然剩磁进行了分析。这项研究的结果与杜波依斯、文森茨和安川之前发表的作品非常一致，但对北美表观极地漂移路径施加了更严格的限制。从豪猪山隆起的侧翼采集了 58 个样本，代表近 900 米的剖面。主要通过热退磁分析，计算出了 Nonesuch 页岩的初级磁化平均方向，磁偏角为 279.8°，倾角 +9.8°，产生的虚拟地磁极位置为东经 176.5°，北纬 10.3°；Freda 砂岩的初级磁化强度平均方向为磁偏角 271.3°，倾角 + 0.7°，产生的虚拟地磁极位置为179.5° E，1.2° N。在 350 °C 和 550 °C 的温度之间去除一组磁化的中间（次级）分量，产生 w...
The natural remanent magnetization of the upper Keweenawan Nonesuch Shale and Freda Sandstone has been analyzed with thermal, alternating field, and chemical demagnetization techniques. The results of this study are in good agreement with previously published works by DuBois and by Vincenz and Yaskawa, but place a tighter constraint on the North American apparent polar wander path. Fifty-eight samples, representing nearly 900 m of section, have been collected from the flanks of the Porcupine Mountain uplift. From principally thermal demagnetization analyses, a mean direction of primary magnetization has been calculated for the Nonesuch Shale, with declination 279.8°, inclination +9.8°, yielding a virtual geomagnetic pole position at 176.5° E, 10.3° N, and for the Freda Sandstone, with declination 271.3° inclination + 0.7°, yielding a virtual geomagnetic pole at 179.5° E, 1.2° N. A group of intermediate (secondary) components of magnetization is removed between temperatures of 350 °C and 550 °C, yielding w...