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Article: Formation of the world's largest molybdenum metallogenic belt: a plate-tectonic perspective on the Qinling molybdenum deposits
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TitleFormation of the world's largest molybdenum metallogenic belt: a plate-tectonic perspective on the Qinling molybdenum deposits
 
AuthorsLi, CL
Wang, FY4 3
Hao, XL2
Ding, X4
Zhang, H1 4
Ling, MX4
Zhou, JB4
Li, YL2
Fan, WM4
Sun, WD4
 
KeywordsAbundance
Age determination
Backarc basin
Carbonate group
Continental collision
 
Issue Date2012
 
PublisherTaylor & Francis Inc. The Journal's web site is located at http://www.tandf.co.uk/journals/TIGR
 
CitationInternational Geology Review, 2012, v. 54 n. 9, p. 1093-1112 [How to Cite?]
DOI: http://dx.doi.org/10.1080/00206814.2011.623039
 
AbstractQinling ore belt is the largest known molybdenum belt in the world with a total reserve of >5 Mt of Mo metal. Based on the geochemical behaviour of Mo, the structural settings of the Qinling orogenic belt, and geological events in eastern China, we propose that tectonic settings are of critical importance to the formation of these ore deposits. Molybdenum is very rare in the earth with an abundance of 0.8 ppm in the continental crust. Both surface- and magmatic-hydrothermal enrichment processes are required for Mo mineralization. It can be easily oxidized to form water-soluble MoO 4- in the surface environment, especially in the Phanaerozoic, and then precipitated under anoxic conditions. Therefore, closed or semi-closed water bodies with large catchment areas and high chemical erosion rates are the most favourable locations for Mo-enriched sediments. The Qinling orogenic belt was located in the tropics during crustal collisions, such that the chemical erosion was presumably intense, whereas the Erlangping back-arc basin was probably a closed or semi-closed water body as a result of plate convergence. More than 90% of the Mo reserves so far discovered in the Qinling molybdenum belt are associated with the Palaeozoic Erlangping back-arc basin. Compiled Re-Os isotopic ages for porphyry deposits (including several carbonate vein deposits) that have been dated show peaks during 220 million years (>0.32 Mt), 145 million years (>3.5 Mt), and 115 million years (>0.84 Mt), which correlate well with the three major episodes of granitoid magmatism since the Triassic. The 220 million year episode of mineralization, represented by the Huanglongpu carbonate vein-type deposit and the Wenquan porphyry deposit, coincided with the formation of the South Qinling syn-orogenic granites as well as the Dabie ultrahigh-pressure metamorphic rocks, suggests a genetic relationship with the collision between South and North China Blocks. The 145 Ma porphyry Mo deposits, representing the main mineralization, are attributed to reactivation by ridge subduction along the lower Yangtze River belt to the east of the Qinling orogen 150-140 Ma. The 115 Ma Mo deposits likely reflect slab rollback of the northwestwards subducting Pacific plate 125-110 Ma. © 2012 Taylor and Francis Group, LLC.
 
ISSN0020-6814
2013 Impact Factor: 2.628
2013 SCImago Journal Rankings: 1.301
 
DOIhttp://dx.doi.org/10.1080/00206814.2011.623039
 
ISI Accession Number IDWOS:000304452300006
 
DC FieldValue
dc.contributor.authorLi, CL
 
dc.contributor.authorWang, FY
 
dc.contributor.authorHao, XL
 
dc.contributor.authorDing, X
 
dc.contributor.authorZhang, H
 
dc.contributor.authorLing, MX
 
dc.contributor.authorZhou, JB
 
dc.contributor.authorLi, YL
 
dc.contributor.authorFan, WM
 
dc.contributor.authorSun, WD
 
dc.date.accessioned2012-08-16T05:51:07Z
 
dc.date.available2012-08-16T05:51:07Z
 
dc.date.issued2012
 
dc.description.abstractQinling ore belt is the largest known molybdenum belt in the world with a total reserve of >5 Mt of Mo metal. Based on the geochemical behaviour of Mo, the structural settings of the Qinling orogenic belt, and geological events in eastern China, we propose that tectonic settings are of critical importance to the formation of these ore deposits. Molybdenum is very rare in the earth with an abundance of 0.8 ppm in the continental crust. Both surface- and magmatic-hydrothermal enrichment processes are required for Mo mineralization. It can be easily oxidized to form water-soluble MoO 4- in the surface environment, especially in the Phanaerozoic, and then precipitated under anoxic conditions. Therefore, closed or semi-closed water bodies with large catchment areas and high chemical erosion rates are the most favourable locations for Mo-enriched sediments. The Qinling orogenic belt was located in the tropics during crustal collisions, such that the chemical erosion was presumably intense, whereas the Erlangping back-arc basin was probably a closed or semi-closed water body as a result of plate convergence. More than 90% of the Mo reserves so far discovered in the Qinling molybdenum belt are associated with the Palaeozoic Erlangping back-arc basin. Compiled Re-Os isotopic ages for porphyry deposits (including several carbonate vein deposits) that have been dated show peaks during 220 million years (>0.32 Mt), 145 million years (>3.5 Mt), and 115 million years (>0.84 Mt), which correlate well with the three major episodes of granitoid magmatism since the Triassic. The 220 million year episode of mineralization, represented by the Huanglongpu carbonate vein-type deposit and the Wenquan porphyry deposit, coincided with the formation of the South Qinling syn-orogenic granites as well as the Dabie ultrahigh-pressure metamorphic rocks, suggests a genetic relationship with the collision between South and North China Blocks. The 145 Ma porphyry Mo deposits, representing the main mineralization, are attributed to reactivation by ridge subduction along the lower Yangtze River belt to the east of the Qinling orogen 150-140 Ma. The 115 Ma Mo deposits likely reflect slab rollback of the northwestwards subducting Pacific plate 125-110 Ma. © 2012 Taylor and Francis Group, LLC.
 
dc.description.naturelink_to_subscribed_fulltext
 
dc.identifier.citationInternational Geology Review, 2012, v. 54 n. 9, p. 1093-1112 [How to Cite?]
DOI: http://dx.doi.org/10.1080/00206814.2011.623039
 
dc.identifier.doihttp://dx.doi.org/10.1080/00206814.2011.623039
 
dc.identifier.epage1112
 
dc.identifier.hkuros204539
 
dc.identifier.isiWOS:000304452300006
 
dc.identifier.issn0020-6814
2013 Impact Factor: 2.628
2013 SCImago Journal Rankings: 1.301
 
dc.identifier.issue9
 
dc.identifier.scopuseid_2-s2.0-84861818614
 
dc.identifier.spage1093
 
dc.identifier.urihttp://hdl.handle.net/10722/159502
 
dc.identifier.volume54
 
dc.languageeng
 
dc.publisherTaylor & Francis Inc. The Journal's web site is located at http://www.tandf.co.uk/journals/TIGR
 
dc.publisher.placeUnited States
 
dc.relation.ispartofInternational Geology Review
 
dc.rightsThis is an electronic version of an article published in [International Geology Review, 2012, v. 54 n. 9, p. 1093-1112]. [International Geology Review] is available online at: http://www.informaworld.com/smpp/ with the open URL of your article.
 
dc.subjectAbundance
 
dc.subjectAge determination
 
dc.subjectBackarc basin
 
dc.subjectCarbonate group
 
dc.subjectContinental collision
 
dc.titleFormation of the world's largest molybdenum metallogenic belt: a plate-tectonic perspective on the Qinling molybdenum deposits
 
dc.typeArticle
 
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<contributor.author>Wang, FY</contributor.author>
<contributor.author>Hao, XL</contributor.author>
<contributor.author>Ding, X</contributor.author>
<contributor.author>Zhang, H</contributor.author>
<contributor.author>Ling, MX</contributor.author>
<contributor.author>Zhou, JB</contributor.author>
<contributor.author>Li, YL</contributor.author>
<contributor.author>Fan, WM</contributor.author>
<contributor.author>Sun, WD</contributor.author>
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<description.abstract>Qinling ore belt is the largest known molybdenum belt in the world with a total reserve of &gt;5 Mt of Mo metal. Based on the geochemical behaviour of Mo, the structural settings of the Qinling orogenic belt, and geological events in eastern China, we propose that tectonic settings are of critical importance to the formation of these ore deposits. Molybdenum is very rare in the earth with an abundance of 0.8 ppm in the continental crust. Both surface- and magmatic-hydrothermal enrichment processes are required for Mo mineralization. It can be easily oxidized to form water-soluble MoO 4- in the surface environment, especially in the Phanaerozoic, and then precipitated under anoxic conditions. Therefore, closed or semi-closed water bodies with large catchment areas and high chemical erosion rates are the most favourable locations for Mo-enriched sediments. The Qinling orogenic belt was located in the tropics during crustal collisions, such that the chemical erosion was presumably intense, whereas the Erlangping back-arc basin was probably a closed or semi-closed water body as a result of plate convergence. More than 90% of the Mo reserves so far discovered in the Qinling molybdenum belt are associated with the Palaeozoic Erlangping back-arc basin. Compiled Re-Os isotopic ages for porphyry deposits (including several carbonate vein deposits) that have been dated show peaks during 220 million years (&gt;0.32 Mt), 145 million years (&gt;3.5 Mt), and 115 million years (&gt;0.84 Mt), which correlate well with the three major episodes of granitoid magmatism since the Triassic. The 220 million year episode of mineralization, represented by the Huanglongpu carbonate vein-type deposit and the Wenquan porphyry deposit, coincided with the formation of the South Qinling syn-orogenic granites as well as the Dabie ultrahigh-pressure metamorphic rocks, suggests a genetic relationship with the collision between South and North China Blocks. The 145 Ma porphyry Mo deposits, representing the main mineralization, are attributed to reactivation by ridge subduction along the lower Yangtze River belt to the east of the Qinling orogen 150-140 Ma. The 115 Ma Mo deposits likely reflect slab rollback of the northwestwards subducting Pacific plate 125-110 Ma. &#169; 2012 Taylor and Francis Group, LLC.</description.abstract>
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<subject>Abundance</subject>
<subject>Age determination</subject>
<subject>Backarc basin</subject>
<subject>Carbonate group</subject>
<subject>Continental collision</subject>
<title>Formation of the world&apos;s largest molybdenum metallogenic belt: a plate-tectonic perspective on the Qinling molybdenum deposits</title>
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Author Affiliations
  1. Graduate University of Chinese Academy of Sciences
  2. The University of Hong Kong
  3. University of Science and Technology of China
  4. Guangzhou Institute of Geochemistry Chinese Academy of Sciences