Nanogoethite as a Potential Indicator of Remagnetization in Red Beds

Wentao Huang; Michael J. Jackson; Mark J. Dekkers; Peat Solheid; Bo Zhang; Zhaojie Guo; Lin Ding

doi:10.1029/2019GL084715

Nanogoethite as a Potential Indicator of Remagnetization in Red Beds

Wentao Huang, Michael J. Jackson, Mark J. Dekkers, Peat Solheid, Bo Zhang, Zhaojie Guo, Lin Ding

Earth and Environmental Sciences-Twin Cities

Research output: Contribution to journal › Article › peer-review

9 Scopus citations

Abstract

Red beds are well-known for recording stable natural remanent magnetization (NRM). However, discriminating primary NRM from secondary remanence in red beds is difficult. The Paleogene Nangqian red beds in eastern Tibetan Plateau variably record an overprint related to nearby magmatism and thus provide a great opportunity to characterize remagnetization in red beds. Through comprehensive rock magnetic, Mössbauer spectroscopic, and petrographic analyses, we find that remagnetization was controlled by temperature. Remagnetized red beds contain abundant authigenic hematite and goethite, with some larger grains unblocking at the Néel temperatures and the remainder (nanoparticles) unblocking at lower temperatures. In contrast, red beds retaining primary NRM are characterized by dominance of detrital hematite and magnetite, presence of fine-grained authigenic hematite, and absence of authigenic goethite and magnetite. High temperature behaviors of NRM/susceptibility are indicative of remagnetization, but the presence of goethite appears to be a more sensitive criterion for diagnosing remagnetization in red beds.

Original language	English (US)
Pages (from-to)	12841-12850
Number of pages	10
Journal	Geophysical Research Letters
Volume	46
Issue number	22
DOIs	https://doi.org/10.1029/2019GL084715
State	Published - Nov 28 2019

Bibliographical note

Funding Information:
Data to support this article are available in supporting information Tables?S1?S6, which are also deposited in Zenodo (34e50cc1f9cbe4dd35c2a62c35ee91e6). W.H. was supported by three visiting research fellowships from the Institute for Rock Magnetism (IRM) at the University of Minnesota, which is funded by the Instruments and Facilities program of NSF. We thank Dr. Dario Bilardello at the IRM, and Dr. Peter C. Lippert at Utah Pmag Center for laboratory assistance. Dr. Pierrick Roperch and Dr. Guillaume Dupont-Nivet are especially appreciated for sharing the thermal demagnetization data and discussing. We are also grateful to Dr. Swanson-Hysell and two anonymous reviewers for their constructive comments, which have greatly helped improve the original manuscript.

Funding Information:
supporting information S1 S6 Data to support this article are available in Tables – , which are also deposited in Zenodo (34e50cc1f9cbe4dd35c2a62c35ee91e6). W.H. was supported by three visiting research fellowships from the Institute for Rock Magnetism (IRM) at the University of Minnesota, which is funded by the Instruments and Facilities program of NSF. We thank Dr. Dario Bilardello at the IRM, and Dr. Peter C. Lippert at Utah Pmag Center for laboratory assistance. Dr. Pierrick Roperch and Dr. Guillaume Dupont‐Nivet are especially appreciated for sharing the thermal demagnetization data and discussing. We are also grateful to Dr. Swanson‐Hysell and two anonymous reviewers for their constructive comments, which have greatly helped improve the original manuscript.

Publisher Copyright:
©2019. American Geophysical Union. All Rights Reserved.

Keywords

goethite
hematite
magnetite
red beds
remagnetization

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10.1029/2019GL084715

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title = "Nanogoethite as a Potential Indicator of Remagnetization in Red Beds",

abstract = "Red beds are well-known for recording stable natural remanent magnetization (NRM). However, discriminating primary NRM from secondary remanence in red beds is difficult. The Paleogene Nangqian red beds in eastern Tibetan Plateau variably record an overprint related to nearby magmatism and thus provide a great opportunity to characterize remagnetization in red beds. Through comprehensive rock magnetic, M{\"o}ssbauer spectroscopic, and petrographic analyses, we find that remagnetization was controlled by temperature. Remagnetized red beds contain abundant authigenic hematite and goethite, with some larger grains unblocking at the N{\'e}el temperatures and the remainder (nanoparticles) unblocking at lower temperatures. In contrast, red beds retaining primary NRM are characterized by dominance of detrital hematite and magnetite, presence of fine-grained authigenic hematite, and absence of authigenic goethite and magnetite. High temperature behaviors of NRM/susceptibility are indicative of remagnetization, but the presence of goethite appears to be a more sensitive criterion for diagnosing remagnetization in red beds.",

keywords = "goethite, hematite, magnetite, red beds, remagnetization",

author = "Wentao Huang and Jackson, {Michael J.} and Dekkers, {Mark J.} and Peat Solheid and Bo Zhang and Zhaojie Guo and Lin Ding",

note = "Funding Information: Data to support this article are available in supporting information Tables?S1?S6, which are also deposited in Zenodo (34e50cc1f9cbe4dd35c2a62c35ee91e6). W.H. was supported by three visiting research fellowships from the Institute for Rock Magnetism (IRM) at the University of Minnesota, which is funded by the Instruments and Facilities program of NSF. We thank Dr. Dario Bilardello at the IRM, and Dr. Peter C. Lippert at Utah Pmag Center for laboratory assistance. Dr. Pierrick Roperch and Dr. Guillaume Dupont-Nivet are especially appreciated for sharing the thermal demagnetization data and discussing. We are also grateful to Dr. Swanson-Hysell and two anonymous reviewers for their constructive comments, which have greatly helped improve the original manuscript. Funding Information: supporting information S1 S6 Data to support this article are available in Tables – , which are also deposited in Zenodo (34e50cc1f9cbe4dd35c2a62c35ee91e6). W.H. was supported by three visiting research fellowships from the Institute for Rock Magnetism (IRM) at the University of Minnesota, which is funded by the Instruments and Facilities program of NSF. We thank Dr. Dario Bilardello at the IRM, and Dr. Peter C. Lippert at Utah Pmag Center for laboratory assistance. Dr. Pierrick Roperch and Dr. Guillaume Dupont‐Nivet are especially appreciated for sharing the thermal demagnetization data and discussing. We are also grateful to Dr. Swanson‐Hysell and two anonymous reviewers for their constructive comments, which have greatly helped improve the original manuscript. Publisher Copyright: {\textcopyright}2019. American Geophysical Union. All Rights Reserved.",

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AU - Guo, Zhaojie

AU - Ding, Lin

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PY - 2019/11/28

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N2 - Red beds are well-known for recording stable natural remanent magnetization (NRM). However, discriminating primary NRM from secondary remanence in red beds is difficult. The Paleogene Nangqian red beds in eastern Tibetan Plateau variably record an overprint related to nearby magmatism and thus provide a great opportunity to characterize remagnetization in red beds. Through comprehensive rock magnetic, Mössbauer spectroscopic, and petrographic analyses, we find that remagnetization was controlled by temperature. Remagnetized red beds contain abundant authigenic hematite and goethite, with some larger grains unblocking at the Néel temperatures and the remainder (nanoparticles) unblocking at lower temperatures. In contrast, red beds retaining primary NRM are characterized by dominance of detrital hematite and magnetite, presence of fine-grained authigenic hematite, and absence of authigenic goethite and magnetite. High temperature behaviors of NRM/susceptibility are indicative of remagnetization, but the presence of goethite appears to be a more sensitive criterion for diagnosing remagnetization in red beds.

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KW - remagnetization

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Nanogoethite as a Potential Indicator of Remagnetization in Red Beds

Abstract

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