Hydrothermal alteration of magnetic fabrics of rocks in the Xiaoban gold-bearing shear belt, Fujian Province, China

Magnetic fabrics indicate that the Xiaoban shear zone underwent low-grade hydrothermal alteration in the Mesozoic (~180Ma). Samples studied come from altered and unaltered units from three mine levels. (1) Susceptibility is mainly due toparamagnetic minerals such as biotite and pyrite. The reduction...

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Detalles Bibliográficos
Autores: Shunshan Xu, Ganguo Wu, Jianshe Wu, Bailin Chen
Tipo de recurso: artículo
Estado:Versión publicada
Fecha de publicación:2003
País:México
Institución:Universidad Nacional Autónoma de México
Repositorio:Redalyc-UNAM
OAI Identifier:oai:redalyc.org:56842107
Acceso en línea:https://www.redalyc.org/articulo.oa?id=56842107
Access Level:acceso abierto
Palabra clave:Ciencias de la Tierra
China
anisotropy
susceptibility
Magnetic fabric
hydrothermal alteration
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spelling Hydrothermal alteration of magnetic fabrics of rocks in the Xiaoban gold-bearing shear belt, Fujian Province, ChinaShunshan XuGanguo WuJianshe WuBailin ChenCiencias de la TierraChinaanisotropysusceptibilityMagnetic fabrichydrothermal alterationMagnetic fabrics indicate that the Xiaoban shear zone underwent low-grade hydrothermal alteration in the Mesozoic (~180Ma). Samples studied come from altered and unaltered units from three mine levels. (1) Susceptibility is mainly due toparamagnetic minerals such as biotite and pyrite. The reduction of mean susceptibility is due to decrease in Fe content and changeof magnetic mineral size, as well as increase of diamagnetic minerals. (2) Anisotropy (P) decreases after hydrothermal alteration.Its tendency to change is the same as that of the mean susceptibility. (3) The AMS ellipsoid does not substantially change its shapeafter hydrothermal alteration. An oblate sphere is maintained. The minimum principal susceptibility axis (K3) falls close to theplane which is perpendicular to the schistosity for all samples. However, the maximum principal susceptibility axis is subject tolarge changes. The results indicate that new magnetic minerals are distributed on the existing schistosity plane, without a preferredorientation.Universidad Nacional Autónoma de México2003info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articleapplication/pdf0016-7169https://www.redalyc.org/articulo.oa?id=56842107Geofísica Internacional (México) Num.1 Vol.42reponame:Redalyc-UNAMinstname:Universidad Nacional Autónoma de Méxicoinstacron:UNAMenhttp://www.redalyc.org/revista.oa?id=568Geofísica Internacionalinfo:eu-repo/semantics/openAccessoai:redalyc.org:568421072025-09-03T18:07:45Z
dc.title.none.fl_str_mv Hydrothermal alteration of magnetic fabrics of rocks in the Xiaoban gold-bearing shear belt, Fujian Province, China
title Hydrothermal alteration of magnetic fabrics of rocks in the Xiaoban gold-bearing shear belt, Fujian Province, China
spellingShingle Hydrothermal alteration of magnetic fabrics of rocks in the Xiaoban gold-bearing shear belt, Fujian Province, China
Shunshan Xu
Ciencias de la Tierra
China
anisotropy
susceptibility
Magnetic fabric
hydrothermal alteration
title_short Hydrothermal alteration of magnetic fabrics of rocks in the Xiaoban gold-bearing shear belt, Fujian Province, China
title_full Hydrothermal alteration of magnetic fabrics of rocks in the Xiaoban gold-bearing shear belt, Fujian Province, China
title_fullStr Hydrothermal alteration of magnetic fabrics of rocks in the Xiaoban gold-bearing shear belt, Fujian Province, China
title_full_unstemmed Hydrothermal alteration of magnetic fabrics of rocks in the Xiaoban gold-bearing shear belt, Fujian Province, China
title_sort Hydrothermal alteration of magnetic fabrics of rocks in the Xiaoban gold-bearing shear belt, Fujian Province, China
dc.creator.none.fl_str_mv Shunshan Xu
Ganguo Wu
Jianshe Wu
Bailin Chen
author Shunshan Xu
author_facet Shunshan Xu
Ganguo Wu
Jianshe Wu
Bailin Chen
author_role author
author2 Ganguo Wu
Jianshe Wu
Bailin Chen
author2_role author
author
author
dc.subject.none.fl_str_mv Ciencias de la Tierra
China
anisotropy
susceptibility
Magnetic fabric
hydrothermal alteration
topic Ciencias de la Tierra
China
anisotropy
susceptibility
Magnetic fabric
hydrothermal alteration
description Magnetic fabrics indicate that the Xiaoban shear zone underwent low-grade hydrothermal alteration in the Mesozoic (~180Ma). Samples studied come from altered and unaltered units from three mine levels. (1) Susceptibility is mainly due toparamagnetic minerals such as biotite and pyrite. The reduction of mean susceptibility is due to decrease in Fe content and changeof magnetic mineral size, as well as increase of diamagnetic minerals. (2) Anisotropy (P) decreases after hydrothermal alteration.Its tendency to change is the same as that of the mean susceptibility. (3) The AMS ellipsoid does not substantially change its shapeafter hydrothermal alteration. An oblate sphere is maintained. The minimum principal susceptibility axis (K3) falls close to theplane which is perpendicular to the schistosity for all samples. However, the maximum principal susceptibility axis is subject tolarge changes. The results indicate that new magnetic minerals are distributed on the existing schistosity plane, without a preferredorientation.
publishDate 2003
dc.date.none.fl_str_mv 2003
dc.type.none.fl_str_mv info:eu-repo/semantics/publishedVersion
info:eu-repo/semantics/article
format article
status_str publishedVersion
dc.identifier.none.fl_str_mv 0016-7169
https://www.redalyc.org/articulo.oa?id=56842107
identifier_str_mv 0016-7169
url https://www.redalyc.org/articulo.oa?id=56842107
dc.language.none.fl_str_mv en
language_invalid_str_mv en
dc.relation.none.fl_str_mv http://www.redalyc.org/revista.oa?id=568
dc.rights.none.fl_str_mv Geofísica Internacional
info:eu-repo/semantics/openAccess
rights_invalid_str_mv Geofísica Internacional
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
dc.publisher.none.fl_str_mv Universidad Nacional Autónoma de México
publisher.none.fl_str_mv Universidad Nacional Autónoma de México
dc.source.none.fl_str_mv Geofísica Internacional (México) Num.1 Vol.42
reponame:Redalyc-UNAM
instname:Universidad Nacional Autónoma de México
instacron:UNAM
instname_str Universidad Nacional Autónoma de México
instacron_str UNAM
institution UNAM
reponame_str Redalyc-UNAM
collection Redalyc-UNAM
repository.name.fl_str_mv
repository.mail.fl_str_mv
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score 14.964248

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