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Article: Metallogenic time and tectonic setting of the Bainaimiao Cu-Au deposit, Inner Mongolia

TitleMetallogenic time and tectonic setting of the Bainaimiao Cu-Au deposit, Inner Mongolia
Authors
KeywordsBainaimiao Cu-Au Deposit
Central Asia Orogen
Inner Mongolia
Isotope Age
Orogenic-Type Copper Deposit
Issue Date2008
PublisherKexue Chubanshe
Citation
Acta Petrologica Sinica, 2008, v. 24 n. 4, p. 890-898 How to Cite?
AbstractThe Bainaimiao Cu-Au-Mo deposit, Inner Mongolia, is located at the Ondor Sum Caledonian accretionary belt, eastern Central Asian Orogenic Belt. Its metallogenic type, time and tectonic setting have been debated for a long time. To time the mineralization, the authors dated grains of biotites and muscovites separated from Au-Cu-bearing quartz-vein, using high-resolution single-grain laser-ablation 40Ar/39 Ar method. 22 analyses of biotites yielded a 40Ar/39 Ar isochron age of 396 ± 2 Ma (MSWD = 20), and 23 of muscovites yielded a 40 Ar/39 Ar isochron age of 358 ± 2 Ma (n = 23, MSWD = 11). This shows that the ore bodies have been formed in Devonian. In the ore field, the magmatites, such as granitic porphyries, yielded isotope ages ranging from 428 to 466 Ma, which predated mineralization by >40 Ma; while the ore-hosting stratum was suggested to have been formed around 1130 Ma, which predated mineralization by > 700 Ma. This evidenced that the Bainaimiao deposit is neither of porphyry-type nor of submarine sedimentary-exhalative type. Instead, it should be an orogenic-type deposit as revealed by a recently completed comprehensive study in ore geology and fluid inclusions. The mineralization ages consist with both the peak-metamorphism (Ca. 384.5 ± 6 Ma) of the ore-hosting rocks of the Bainaimiao Group and the late Silurian-Devonian collision of the Ondor Sum accretionary magmaitc arc on the northern margin of North China craton. Hence the Bainaimiao Cu-Au deposit is the first case of orogenic-type Cu deposit formed in collisional-orogenic regime.
Persistent Identifierhttp://hdl.handle.net/10722/92091
ISSN
2015 Impact Factor: 1.234
2015 SCImago Journal Rankings: 0.892
References

 

DC FieldValueLanguage
dc.contributor.authorLi, WBen_HK
dc.contributor.authorChen, YJen_HK
dc.contributor.authorLai, Yen_HK
dc.contributor.authorJi, JQen_HK
dc.date.accessioned2010-09-17T10:35:49Z-
dc.date.available2010-09-17T10:35:49Z-
dc.date.issued2008en_HK
dc.identifier.citationActa Petrologica Sinica, 2008, v. 24 n. 4, p. 890-898en_HK
dc.identifier.issn1000-0569en_HK
dc.identifier.urihttp://hdl.handle.net/10722/92091-
dc.description.abstractThe Bainaimiao Cu-Au-Mo deposit, Inner Mongolia, is located at the Ondor Sum Caledonian accretionary belt, eastern Central Asian Orogenic Belt. Its metallogenic type, time and tectonic setting have been debated for a long time. To time the mineralization, the authors dated grains of biotites and muscovites separated from Au-Cu-bearing quartz-vein, using high-resolution single-grain laser-ablation 40Ar/39 Ar method. 22 analyses of biotites yielded a 40Ar/39 Ar isochron age of 396 ± 2 Ma (MSWD = 20), and 23 of muscovites yielded a 40 Ar/39 Ar isochron age of 358 ± 2 Ma (n = 23, MSWD = 11). This shows that the ore bodies have been formed in Devonian. In the ore field, the magmatites, such as granitic porphyries, yielded isotope ages ranging from 428 to 466 Ma, which predated mineralization by >40 Ma; while the ore-hosting stratum was suggested to have been formed around 1130 Ma, which predated mineralization by > 700 Ma. This evidenced that the Bainaimiao deposit is neither of porphyry-type nor of submarine sedimentary-exhalative type. Instead, it should be an orogenic-type deposit as revealed by a recently completed comprehensive study in ore geology and fluid inclusions. The mineralization ages consist with both the peak-metamorphism (Ca. 384.5 ± 6 Ma) of the ore-hosting rocks of the Bainaimiao Group and the late Silurian-Devonian collision of the Ondor Sum accretionary magmaitc arc on the northern margin of North China craton. Hence the Bainaimiao Cu-Au deposit is the first case of orogenic-type Cu deposit formed in collisional-orogenic regime.en_HK
dc.languageengen_HK
dc.publisherKexue Chubansheen_HK
dc.relation.ispartofActa Petrologica Sinicaen_HK
dc.subjectBainaimiao Cu-Au Depositen_HK
dc.subjectCentral Asia Orogenen_HK
dc.subjectInner Mongoliaen_HK
dc.subjectIsotope Ageen_HK
dc.subjectOrogenic-Type Copper Depositen_HK
dc.titleMetallogenic time and tectonic setting of the Bainaimiao Cu-Au deposit, Inner Mongoliaen_HK
dc.typeArticleen_HK
dc.identifier.emailChen, Y:ychenc@hkucc.hku.hken_HK
dc.identifier.authorityChen, Y=rp1318en_HK
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.scopuseid_2-s2.0-49149108552en_HK
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-49149108552&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume24en_HK
dc.identifier.issue4en_HK
dc.identifier.spage890en_HK
dc.identifier.epage898en_HK

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