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Article: Mineralogical and metasomatic evolution of the Jurassic Baoshan scheelite skarn deposit, Nanling, South China

TitleMineralogical and metasomatic evolution of the Jurassic Baoshan scheelite skarn deposit, Nanling, South China
Authors
KeywordsFluid inclusion
Granite
Jurassic
Nanling
Scheelite deposit
Issue Date2018
PublisherElsevier BV. The Journal's web site is located at http://www.elsevier.com/locate/oregeorev
Citation
Ore Geology Reviews, 2018, v. 95, p. 182-194 How to Cite?
AbstractThe Baoshan scheelite deposit, located in the Nanling region, South China, is a skarn-type tungsten ore deposit. Orebodies occur in the contact zone between Carboniferous limestone and Baoshan granitic pluton. The pluton consists mostly of coarse-grained, porphyritic, and fine-grained biotite granites, which have zircon U-Pb ages of 172.4 ± 0.3 Ma, 166.6 ± 0.3 Ma, and 156.6 ± 1.4 Ma, respectively. These rocks have similar geochemical characteristics with high SiO2, total alkalis, high differentiation indexes and high Rb/Sr ratios of S-type granites formed by partial melting of upper continental crust. The porphyritic granites display the highest degree of fractionation, and are most closely associated with the formation of skarn ores. The skarns are zoned mineralogically outward from garnet, through clinopyroxene, to wollastonite, and overprinted by retrograde minerals. Three stages of skarnization are recognized: Early prograde, late prograde and retrograde. The early prograde stage is mainly composed of Al-rich garnet (Grs60–76) and Mg-rich clinopyroxene (Di41–62) with subordinate Mo-rich scheelite (Sch59–86), all of which are typically overgrown by late prograde assemblages of Fe-rich garnet (And67–95), Fe-rich clinopyroxene (Hd81–87), and Mo-depleted scheelite (Sch97–98). The retrograde stage is characterized by Al-rich garnet (Grs40–66) and pure scheelite (Sch100), accompanied by hydrous and sulfide minerals. Minor subcalcic garnet with magnetite sometimes occurs in the limited endoskarns. Fluid inclusions of the early prograde minerals homogenize at 390.5 to >550 °C, and one inclusion in wollastonite has a salinity of 13.0 equiv. wt% NaCl. Inclusions in minerals of the late prograde and retrograde stages have homogenization temperatures of 196.9–377.4 °C and 160.4–291.4 °C, respectively; their salinities 2.4–19.0 equiv. wt% NaCl and 1.4–11.6 equiv. wt% NaCl, respectively. Accordingly, the high-temperature and moderate- to high-salinity fluids in the early skarn stages are typical of magmatic fluids originating granites, whereas the lower temperature and variable salinity in the later stages suggest mixing with meteoric water. © 2018 Elsevier B.V.
Persistent Identifierhttp://hdl.handle.net/10722/263244
ISSN
2020 Impact Factor: 3.809
2015 SCImago Journal Rankings: 1.753
ISI Accession Number ID

 

DC FieldValueLanguage
dc.contributor.authorZhao, W-
dc.contributor.authorZhou, MF-
dc.date.accessioned2018-10-22T07:35:49Z-
dc.date.available2018-10-22T07:35:49Z-
dc.date.issued2018-
dc.identifier.citationOre Geology Reviews, 2018, v. 95, p. 182-194-
dc.identifier.issn0169-1368-
dc.identifier.urihttp://hdl.handle.net/10722/263244-
dc.description.abstractThe Baoshan scheelite deposit, located in the Nanling region, South China, is a skarn-type tungsten ore deposit. Orebodies occur in the contact zone between Carboniferous limestone and Baoshan granitic pluton. The pluton consists mostly of coarse-grained, porphyritic, and fine-grained biotite granites, which have zircon U-Pb ages of 172.4 ± 0.3 Ma, 166.6 ± 0.3 Ma, and 156.6 ± 1.4 Ma, respectively. These rocks have similar geochemical characteristics with high SiO2, total alkalis, high differentiation indexes and high Rb/Sr ratios of S-type granites formed by partial melting of upper continental crust. The porphyritic granites display the highest degree of fractionation, and are most closely associated with the formation of skarn ores. The skarns are zoned mineralogically outward from garnet, through clinopyroxene, to wollastonite, and overprinted by retrograde minerals. Three stages of skarnization are recognized: Early prograde, late prograde and retrograde. The early prograde stage is mainly composed of Al-rich garnet (Grs60–76) and Mg-rich clinopyroxene (Di41–62) with subordinate Mo-rich scheelite (Sch59–86), all of which are typically overgrown by late prograde assemblages of Fe-rich garnet (And67–95), Fe-rich clinopyroxene (Hd81–87), and Mo-depleted scheelite (Sch97–98). The retrograde stage is characterized by Al-rich garnet (Grs40–66) and pure scheelite (Sch100), accompanied by hydrous and sulfide minerals. Minor subcalcic garnet with magnetite sometimes occurs in the limited endoskarns. Fluid inclusions of the early prograde minerals homogenize at 390.5 to >550 °C, and one inclusion in wollastonite has a salinity of 13.0 equiv. wt% NaCl. Inclusions in minerals of the late prograde and retrograde stages have homogenization temperatures of 196.9–377.4 °C and 160.4–291.4 °C, respectively; their salinities 2.4–19.0 equiv. wt% NaCl and 1.4–11.6 equiv. wt% NaCl, respectively. Accordingly, the high-temperature and moderate- to high-salinity fluids in the early skarn stages are typical of magmatic fluids originating granites, whereas the lower temperature and variable salinity in the later stages suggest mixing with meteoric water. © 2018 Elsevier B.V.-
dc.languageeng-
dc.publisherElsevier BV. The Journal's web site is located at http://www.elsevier.com/locate/oregeorev-
dc.relation.ispartofOre Geology Reviews-
dc.subjectFluid inclusion-
dc.subjectGranite-
dc.subjectJurassic-
dc.subjectNanling-
dc.subjectScheelite deposit-
dc.titleMineralogical and metasomatic evolution of the Jurassic Baoshan scheelite skarn deposit, Nanling, South China-
dc.typeArticle-
dc.identifier.emailZhao, W: zhaowen2@hku.hk-
dc.identifier.emailZhou, MF: mfzhou@hku.hk-
dc.identifier.authorityZhou, MF=rp00844-
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.doi10.1016/j.oregeorev.2018.01.032-
dc.identifier.scopuseid_2-s2.0-85042601625-
dc.identifier.hkuros294669-
dc.identifier.volume95-
dc.identifier.spage182-
dc.identifier.epage194-
dc.identifier.isiWOS:000432760500011-
dc.publisher.placeNetherlands-
dc.identifier.issnl0169-1368-

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