Rock magnetic evidence for inclination shallowing in the Passaic Formation red beds from the Newark basin and a systematic bias of the Late Triassic apparent polar wander path for North America

Tan, Xiaodong; Kodama, Kenneth P.; Gilder, Stuart; Courtillot, Vincent

doi:10.1016/j.epsl.2006.11.043

Cited by 49 publications

(57 citation statements)

References 57 publications

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“…DRM hosted in hematite may be subject to inclination flattening as platy crystals align with the bedding. CRM, however, forms after deposition as hematite domains grow large enough to develop stable magnetic moments under influence of the ambient field, and it is generally assumed that CRM will not produce inclination flattening unless hematite authigenesis occurs before the sediment is substantially compacted [ Tan et al , 2007].…”

Section: Discussionmentioning

confidence: 99%

Clockwise rotation and implications for northward drift of the western Transverse Ranges from paleomagnetism of the Piuma Member, Sespe Formation, near Malibu, California

Hillhouse

2010

Geochem Geophys Geosyst

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New paleomagnetic results from mid‐Tertiary sedimentary beds in the Santa Monica Mountains reinforce the evidence for large‐scale rotation of the western Transverse Ranges, and anisotropy measurements indicate that compaction‐induced inclination flattening may resolve a long‐standing controversy regarding the original paleolatitude of the rotated block. Previously published paleomagnetic data indicate that post‐Oligocene rotation amounts to 70°–110° clockwise, affecting the Channel Islands, Santa Monica Mountains, and Santa Ynez Mountains. The Sespe Formation near Malibu consists of a lower member dominated by nonmarine sandstone and conglomerate and an upper section, the Piuma Member, which consists of gray‐red sandstone and mudstone interbedded with minor tuff and limestone beds. The Piuma Member has a paleomagnetic pole at 36.6°N, 326.7°E (A95min = 5.0°, A95max = 9.6°), obtained by thermal demagnetization of 34 oriented cores from Oligocene and early Miocene beds. After correcting for plunge of the geologic structure, the data are consistent with significant clockwise rotation (77° ± 7°) of the region relative to stable North America. Rotation of the western Transverse Ranges is generally viewed as a consequence of Pacific–North American plate interactions after 28 Ma, when east–west subduction gave way to northwest transform motion in southern California. Inclinations from the Piuma study indicate a paleolatitude anomaly of 11° ± 7° and are consistent with a mean northward drift that exceeds generally accepted San Andreas fault displacement by a factor of 3. However, sedimentary inclination error may accentuate the anomaly. Anisotropy of isothermal remanent magnetization indicates inclination flattening of approximately 8°, and correction for the effect reduces the paleolatitude anomaly to 5.3° ± 5.8°. Compaction may explain the inclination flattening in these sedimentary rocks, but the process does not adequately explain lower‐than‐expected inclinations found in previous studies of Miocene volcanic rocks of the western Transverse Ranges.

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Section: Discussionmentioning

confidence: 99%

Clockwise rotation and implications for northward drift of the western Transverse Ranges from paleomagnetism of the Piuma Member, Sespe Formation, near Malibu, California

Hillhouse

2010

Geochem Geophys Geosyst

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“…Fine hematite particles, often of varying grain sizes and CRM in origin, are responsible for the distributed spectra while larger, specular hematite particles, depositional or detrital (DRM) in origin, exhibit discrete spectra (Tan et al, 2007). The predominance of Component B and the subservience of Component C in these remagnetized samples appear to indicate that the growth of the authigenic pigmentary hematite carrying the B component was at the expense of the primary specularite carrying the C component.…”

Section: Pervasive Remagnetization Of the Feixianguan Fm In Western Gmentioning

confidence: 97%

Post-folding magnetization of the Triassic rocks from western Guizhou and southern Yunnan provinces: New evidence for large clockwise rotations in the Simao Terrane

Huang

Opdyke

2015

Earth and Planetary Science Letters

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“…However, previous studies show that DRM carried by detrital hematite can suffer from serious inclination shallowing which can complicate the interpretation of paleomagnetic results from red beds (e.g., Tauxe and Kent, 1984;Tan et al, 2007;Bilardello and Kodama, 2010). Hence, CRM recorded shortly after deposition can record the direction of the actual magnetic field and is more suitable for paleomagnetic studies than DRM (Tauxe and Kent, 2004;Mitra and Tauxe, 2009;Iosifidi et al, 2010).…”

Section: As Expected From Theory No Inclination Shallowing Occurs Inmentioning

confidence: 99%

Acquisition of chemical remanent magnetization during experimental ferrihydrite–hematite conversion in Earth-like magnetic field—implications for paleomagnetic studies of red beds

Jiang

Liu

Dekkers

et al. 2015

Earth and Planetary Science Letters

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Hematite-bearing red beds are renowned for their chemical remanent magnetization (CRM). If the CRM was acquired substantially later than the sediment was formed, this severely compromises paleomagnetic records. To improve our interpretation of the natural remanent magnetization, the intricacies of the CRM acquisition process must be understood. Here, we contribute to this issue by synthesizing hematite under controlled 'Earth-like' field conditions (< ~100 µT).CRM was imparted in 90 oriented samples with varying inclinations. The final magnetic remanence carrier is hematite with traces of ferrimagnetic ferrihydrite or maghemite. When the magnetic field intensity is > ~40 µT, CRM of hematite records the field direction faithfully. However, for growth field intensities < ~40 µT, the CRM direction may deviate considerably from that of the growth field. The CRM intensity normalized by the isothermal remanent magnetization (CRM/IRM @2.5 T ) increases linearly with the intensity of growth field, implying that CRM could potentially be useful for relative paleointensity studies. The hematite CRM has a distributed unblocking temperature spectrum from ~200 to ~650 °C while hematite with a depositional remanent magnetization (DRM) has a more confined spectrum from ~600 to 680 °C. Further, the CRM thermal demagnetization curves with their concave shape are notably different from their DRM counterparts which are convex. These differences together are suggested to be a potential discriminator of CRM from DRM carried by hematite in natural red beds, and of significance for the interpretation of paleomagnetic studies on red beds.

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Rock magnetic evidence for inclination shallowing in the Passaic Formation red beds from the Newark basin and a systematic bias of the Late Triassic apparent polar wander path for North America

Cited by 49 publications

References 57 publications

Clockwise rotation and implications for northward drift of the western Transverse Ranges from paleomagnetism of the Piuma Member, Sespe Formation, near Malibu, California

Clockwise rotation and implications for northward drift of the western Transverse Ranges from paleomagnetism of the Piuma Member, Sespe Formation, near Malibu, California

Post-folding magnetization of the Triassic rocks from western Guizhou and southern Yunnan provinces: New evidence for large clockwise rotations in the Simao Terrane

Acquisition of chemical remanent magnetization during experimental ferrihydrite–hematite conversion in Earth-like magnetic field—implications for paleomagnetic studies of red beds

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