Home > Research > Publications & Outputs > Remagnetization of Red Beds on the Tibetan Plateau

Links

Text available via DOI:

View graph of relations

Remagnetization of Red Beds on the Tibetan Plateau: Mechanism and Diagnosis

Research output: Contribution to Journal/MagazineJournal articlepeer-review

Published

Standard

Remagnetization of Red Beds on the Tibetan Plateau : Mechanism and Diagnosis. / Huang, W.; Jackson, M.J.; Dekkers, M.J. et al.

In: Journal of Geophysical Research: Solid Earth, Vol. 125, No. 8, e2020JB020068, 18.08.2020.

Research output: Contribution to Journal/MagazineJournal articlepeer-review

Harvard

Huang, W, Jackson, MJ, Dekkers, MJ, Solheid, P, Zhang, Y, Li, S, Guo, Z & Ding, L 2020, 'Remagnetization of Red Beds on the Tibetan Plateau: Mechanism and Diagnosis', Journal of Geophysical Research: Solid Earth, vol. 125, no. 8, e2020JB020068. https://doi.org/10.1029/2020JB020068

APA

Huang, W., Jackson, M. J., Dekkers, M. J., Solheid, P., Zhang, Y., Li, S., Guo, Z., & Ding, L. (2020). Remagnetization of Red Beds on the Tibetan Plateau: Mechanism and Diagnosis. Journal of Geophysical Research: Solid Earth, 125(8), [e2020JB020068]. https://doi.org/10.1029/2020JB020068

Vancouver

Huang W, Jackson MJ, Dekkers MJ, Solheid P, Zhang Y, Li S et al. Remagnetization of Red Beds on the Tibetan Plateau: Mechanism and Diagnosis. Journal of Geophysical Research: Solid Earth. 2020 Aug 18;125(8):e2020JB020068. Epub 2020 Jul 11. doi: 10.1029/2020JB020068

Author

Huang, W. ; Jackson, M.J. ; Dekkers, M.J. et al. / Remagnetization of Red Beds on the Tibetan Plateau : Mechanism and Diagnosis. In: Journal of Geophysical Research: Solid Earth. 2020 ; Vol. 125, No. 8.

Bibtex

@article{c57cb14c2b8541b7aa8268ba92e0c7f3,
title = "Remagnetization of Red Beds on the Tibetan Plateau: Mechanism and Diagnosis",
abstract = "Red beds are important targets for paleomagnetic studies, yet discriminating secondary chemical remanent magnetization (CRM) from primary depositional remanent magnetization (DRM) in them remains challenging. Here we reanalyze the thermal demagnetization data of and conduct comprehensive rock magnetic, M{\"o}ssbauer spectroscopic and petrographic studies on red beds from four Cenozoic basins on the eastern Tibetan Plateau (China): the Gongjue, Nangqian, Shanglaxiu, and Jinggu basins. The red beds in the latter two basins are remagnetized, as are most Nangqian red beds. The Gongjue red beds and some Nangqian red beds retain a DRM. Our results reveal that detrital (titano)magnetite and hematite are well preserved in red beds retaining the DRM, whereas remagnetized red beds contain large amounts of authigenic hematite and goethite with detrital Fe-bearing minerals strongly altered. Postdepositional diagenetic alteration induced by heating and/or fluid circulation related to magmatism and/or crustal deformation is probably the main reason for the remagnetization. Hematite carrying the CRM in remagnetized red beds has wide distribution of grain size and unblocking temperature spectra, while hematite carrying the DRM is usually coarse and has confined unblocking temperature spectrum. This can be used as a criterion for diagnosing remagnetization. Nanoscale goethite appears to occur only in remagnetized red beds: another sensitive criterion for discriminating CRM from DRM. These property-based criteria constrain the origin of the NRM in red beds better than the classic paleomagnetic field tests. Our research emphasizes that integrated rock magnetic, M{\"o}ssbauer spectroscopic and petrographic studies provide robust tools to diagnose remagnetization in red beds. ",
keywords = "red bed, remagnetization, hematite, goethite, mechanism, diagnosis",
author = "W. Huang and M.J. Jackson and M.J. Dekkers and P. Solheid and Y. Zhang and Shihu Li and Z. Guo and L. Ding",
year = "2020",
month = aug,
day = "18",
doi = "10.1029/2020JB020068",
language = "English",
volume = "125",
journal = "Journal of Geophysical Research: Solid Earth",
issn = "2169-9356",
publisher = "Wiley-Blackwell",
number = "8",

}

RIS

TY - JOUR

T1 - Remagnetization of Red Beds on the Tibetan Plateau

T2 - Mechanism and Diagnosis

AU - Huang, W.

AU - Jackson, M.J.

AU - Dekkers, M.J.

AU - Solheid, P.

AU - Zhang, Y.

AU - Li, Shihu

AU - Guo, Z.

AU - Ding, L.

PY - 2020/8/18

Y1 - 2020/8/18

N2 - Red beds are important targets for paleomagnetic studies, yet discriminating secondary chemical remanent magnetization (CRM) from primary depositional remanent magnetization (DRM) in them remains challenging. Here we reanalyze the thermal demagnetization data of and conduct comprehensive rock magnetic, Mössbauer spectroscopic and petrographic studies on red beds from four Cenozoic basins on the eastern Tibetan Plateau (China): the Gongjue, Nangqian, Shanglaxiu, and Jinggu basins. The red beds in the latter two basins are remagnetized, as are most Nangqian red beds. The Gongjue red beds and some Nangqian red beds retain a DRM. Our results reveal that detrital (titano)magnetite and hematite are well preserved in red beds retaining the DRM, whereas remagnetized red beds contain large amounts of authigenic hematite and goethite with detrital Fe-bearing minerals strongly altered. Postdepositional diagenetic alteration induced by heating and/or fluid circulation related to magmatism and/or crustal deformation is probably the main reason for the remagnetization. Hematite carrying the CRM in remagnetized red beds has wide distribution of grain size and unblocking temperature spectra, while hematite carrying the DRM is usually coarse and has confined unblocking temperature spectrum. This can be used as a criterion for diagnosing remagnetization. Nanoscale goethite appears to occur only in remagnetized red beds: another sensitive criterion for discriminating CRM from DRM. These property-based criteria constrain the origin of the NRM in red beds better than the classic paleomagnetic field tests. Our research emphasizes that integrated rock magnetic, Mössbauer spectroscopic and petrographic studies provide robust tools to diagnose remagnetization in red beds.

AB - Red beds are important targets for paleomagnetic studies, yet discriminating secondary chemical remanent magnetization (CRM) from primary depositional remanent magnetization (DRM) in them remains challenging. Here we reanalyze the thermal demagnetization data of and conduct comprehensive rock magnetic, Mössbauer spectroscopic and petrographic studies on red beds from four Cenozoic basins on the eastern Tibetan Plateau (China): the Gongjue, Nangqian, Shanglaxiu, and Jinggu basins. The red beds in the latter two basins are remagnetized, as are most Nangqian red beds. The Gongjue red beds and some Nangqian red beds retain a DRM. Our results reveal that detrital (titano)magnetite and hematite are well preserved in red beds retaining the DRM, whereas remagnetized red beds contain large amounts of authigenic hematite and goethite with detrital Fe-bearing minerals strongly altered. Postdepositional diagenetic alteration induced by heating and/or fluid circulation related to magmatism and/or crustal deformation is probably the main reason for the remagnetization. Hematite carrying the CRM in remagnetized red beds has wide distribution of grain size and unblocking temperature spectra, while hematite carrying the DRM is usually coarse and has confined unblocking temperature spectrum. This can be used as a criterion for diagnosing remagnetization. Nanoscale goethite appears to occur only in remagnetized red beds: another sensitive criterion for discriminating CRM from DRM. These property-based criteria constrain the origin of the NRM in red beds better than the classic paleomagnetic field tests. Our research emphasizes that integrated rock magnetic, Mössbauer spectroscopic and petrographic studies provide robust tools to diagnose remagnetization in red beds.

KW - red bed

KW - remagnetization

KW - hematite

KW - goethite

KW - mechanism

KW - diagnosis

U2 - 10.1029/2020JB020068

DO - 10.1029/2020JB020068

M3 - Journal article

VL - 125

JO - Journal of Geophysical Research: Solid Earth

JF - Journal of Geophysical Research: Solid Earth

SN - 2169-9356

IS - 8

M1 - e2020JB020068

ER -