Genetic implications of Zn‐ and Mn‐rich Cr‐spinels in serpentinites of the Tidding Suture Zone, eastern Himalaya, NE India
Identifieur interne : 001048 ( Istex/Curation ); précédent : 001047; suivant : 001049Genetic implications of Zn‐ and Mn‐rich Cr‐spinels in serpentinites of the Tidding Suture Zone, eastern Himalaya, NE India
Auteurs : Athokpam K. Singh [Inde] ; Rajkumar B. Singh [Inde]Source :
- Geological Journal [ 0072-1050 ] ; 2013-01.
Abstract
Metamorphosed serpentinites of the Tidding Suture Zone (TSZ), eastern Himalaya, contain variably altered Cr‐spinels that are concentrically zoned from high‐Cr, low‐Fe3+ spinel at the core to Cr‐magnetite at the rim. Two types of Cr‐spinel have been recognized, based on back‐scattered electron imaging in conjunction with microprobe analytical profiles. Cr‐spinel type‐I is present in the least metamorphosed serpentinite (Cr# = 0.78–0.85, Mg# = 0.38–0.45) and Cr‐spinel type‐II is present in the most highly metamorphosed serpentinite (Cr# = 0.86–0.94, Mg# = 0.10–0.34). Primary igneous compositions are preserved in the type‐I chromites whereas these compositions have been partly or completely obscured by metamorphism and alteration in type‐II grains. The enrichment of Mn and Zn increases from the type‐I (MnO = 1.86–2.42 wt.%, ZnO = 0.77–1.67 wt.%) to type‐II (MnO = 2.72–4.04 wt.%, ZnO = 1.33–3.22 wt.%) and the strong similarity in their distribution patterns implies that these elements were introduced during low‐grade metamorphism and serpentinization. The abundance of Mg‐rich chlorite and serpentine minerals suggest that olivine was the predominant silicate phase before serpentinization. Zn and Mn enrichment in the core zone of the Cr‐spinel is due to the substitution of Mg2+ and in part of Fe2+, by Zn and Mn. These elements were probably supplied from olivine upon serpentinization during and after obduction of the ophiolitic mélange along the Tidding Suture Zone in the eastern Himalaya, NE India. Copyright © 2012 John Wiley & Sons, Ltd.
Url:
DOI: 10.1002/gj.2428
Links toward previous steps (curation, corpus...)
- to stream Istex, to step Corpus: Pour aller vers cette notice dans l'étape Curation :001559
Links to Exploration step
ISTEX:18F0CEB7F1A030FB442E30317D740A81070015C9Le document en format XML
<record><TEI wicri:istexFullTextTei="biblStruct"><teiHeader><fileDesc><titleStmt><title xml:lang="en">Genetic implications of Zn‐ and Mn‐rich Cr‐spinels in serpentinites of the Tidding Suture Zone, eastern Himalaya, NE India</title>
<author><name sortKey="Singh, Athokpam K" sort="Singh, Athokpam K" uniqKey="Singh A" first="Athokpam K." last="Singh">Athokpam K. Singh</name>
<affiliation wicri:level="1"><mods:affiliation>Wadia Institute of Himalayan Geology, Dehradun‐248001, India</mods:affiliation>
<country xml:lang="fr">Inde</country>
<wicri:regionArea>Wadia Institute of Himalayan Geology, Dehradun‐248001</wicri:regionArea>
</affiliation>
<affiliation><mods:affiliation>E-mail: aksingh_wihg@rediffmail.com</mods:affiliation>
<wicri:noCountry code="no comma">E-mail: aksingh_wihg@rediffmail.com</wicri:noCountry>
</affiliation>
</author>
<author><name sortKey="Singh, Rajkumar B" sort="Singh, Rajkumar B" uniqKey="Singh R" first="Rajkumar B." last="Singh">Rajkumar B. Singh</name>
<affiliation wicri:level="1"><mods:affiliation>Wadia Institute of Himalayan Geology, Dehradun‐248001, India</mods:affiliation>
<country xml:lang="fr">Inde</country>
<wicri:regionArea>Wadia Institute of Himalayan Geology, Dehradun‐248001</wicri:regionArea>
</affiliation>
</author>
</titleStmt>
<publicationStmt><idno type="wicri:source">ISTEX</idno>
<idno type="RBID">ISTEX:18F0CEB7F1A030FB442E30317D740A81070015C9</idno>
<date when="2013" year="2013">2013</date>
<idno type="doi">10.1002/gj.2428</idno>
<idno type="url">https://api.istex.fr/document/18F0CEB7F1A030FB442E30317D740A81070015C9/fulltext/pdf</idno>
<idno type="wicri:Area/Istex/Corpus">001559</idno>
<idno type="wicri:explorRef" wicri:stream="Istex" wicri:step="Corpus" wicri:corpus="ISTEX">001559</idno>
<idno type="wicri:Area/Istex/Curation">001048</idno>
</publicationStmt>
<sourceDesc><biblStruct><analytic><title level="a" type="main" xml:lang="en">Genetic implications of Zn‐ and Mn‐rich Cr‐spinels in serpentinites of the Tidding Suture Zone, eastern Himalaya, NE India</title>
<author><name sortKey="Singh, Athokpam K" sort="Singh, Athokpam K" uniqKey="Singh A" first="Athokpam K." last="Singh">Athokpam K. Singh</name>
<affiliation wicri:level="1"><mods:affiliation>Wadia Institute of Himalayan Geology, Dehradun‐248001, India</mods:affiliation>
<country xml:lang="fr">Inde</country>
<wicri:regionArea>Wadia Institute of Himalayan Geology, Dehradun‐248001</wicri:regionArea>
</affiliation>
<affiliation><mods:affiliation>E-mail: aksingh_wihg@rediffmail.com</mods:affiliation>
</affiliation>
</author>
<author><name sortKey="Singh, Rajkumar B" sort="Singh, Rajkumar B" uniqKey="Singh R" first="Rajkumar B." last="Singh">Rajkumar B. Singh</name>
<affiliation wicri:level="1"><mods:affiliation>Wadia Institute of Himalayan Geology, Dehradun‐248001, India</mods:affiliation>
<country xml:lang="fr">Inde</country>
<wicri:regionArea>Wadia Institute of Himalayan Geology, Dehradun‐248001</wicri:regionArea>
</affiliation>
</author>
</analytic>
<monogr></monogr>
<series><title level="j">Geological Journal</title>
<title level="j" type="abbrev">Geol. J.</title>
<idno type="ISSN">0072-1050</idno>
<idno type="eISSN">1099-1034</idno>
<imprint><publisher>Blackwell Publishing Ltd</publisher>
<date type="published" when="2013-01">2013-01</date>
<biblScope unit="volume">48</biblScope>
<biblScope unit="issue">1</biblScope>
<biblScope unit="page" from="22">22</biblScope>
<biblScope unit="page" to="38">38</biblScope>
</imprint>
<idno type="ISSN">0072-1050</idno>
</series>
<idno type="istex">18F0CEB7F1A030FB442E30317D740A81070015C9</idno>
<idno type="DOI">10.1002/gj.2428</idno>
<idno type="ArticleID">GJ2428</idno>
</biblStruct>
</sourceDesc>
<seriesStmt><idno type="ISSN">0072-1050</idno>
</seriesStmt>
</fileDesc>
<profileDesc><textClass></textClass>
<langUsage><language ident="en">en</language>
</langUsage>
</profileDesc>
</teiHeader>
<front><div type="abstract">Metamorphosed serpentinites of the Tidding Suture Zone (TSZ), eastern Himalaya, contain variably altered Cr‐spinels that are concentrically zoned from high‐Cr, low‐Fe3+ spinel at the core to Cr‐magnetite at the rim. Two types of Cr‐spinel have been recognized, based on back‐scattered electron imaging in conjunction with microprobe analytical profiles. Cr‐spinel type‐I is present in the least metamorphosed serpentinite (Cr# = 0.78–0.85, Mg# = 0.38–0.45) and Cr‐spinel type‐II is present in the most highly metamorphosed serpentinite (Cr# = 0.86–0.94, Mg# = 0.10–0.34). Primary igneous compositions are preserved in the type‐I chromites whereas these compositions have been partly or completely obscured by metamorphism and alteration in type‐II grains. The enrichment of Mn and Zn increases from the type‐I (MnO = 1.86–2.42 wt.%, ZnO = 0.77–1.67 wt.%) to type‐II (MnO = 2.72–4.04 wt.%, ZnO = 1.33–3.22 wt.%) and the strong similarity in their distribution patterns implies that these elements were introduced during low‐grade metamorphism and serpentinization. The abundance of Mg‐rich chlorite and serpentine minerals suggest that olivine was the predominant silicate phase before serpentinization. Zn and Mn enrichment in the core zone of the Cr‐spinel is due to the substitution of Mg2+ and in part of Fe2+, by Zn and Mn. These elements were probably supplied from olivine upon serpentinization during and after obduction of the ophiolitic mélange along the Tidding Suture Zone in the eastern Himalaya, NE India. Copyright © 2012 John Wiley & Sons, Ltd.</div>
</front>
</TEI>
</record>
Pour manipuler ce document sous Unix (Dilib)
EXPLOR_STEP=$WICRI_ROOT/Wicri/Terre/explor/NickelMaghrebV1/Data/Istex/Curation
HfdSelect -h $EXPLOR_STEP/biblio.hfd -nk 001048 | SxmlIndent | more
Ou
HfdSelect -h $EXPLOR_AREA/Data/Istex/Curation/biblio.hfd -nk 001048 | SxmlIndent | more
Pour mettre un lien sur cette page dans le réseau Wicri
{{Explor lien |wiki= Wicri/Terre |area= NickelMaghrebV1 |flux= Istex |étape= Curation |type= RBID |clé= ISTEX:18F0CEB7F1A030FB442E30317D740A81070015C9 |texte= Genetic implications of Zn‐ and Mn‐rich Cr‐spinels in serpentinites of the Tidding Suture Zone, eastern Himalaya, NE India }}
![]() | This area was generated with Dilib version V0.6.27. | ![]() |