File Download

There are no files associated with this item.

  Links for fulltext
     (May Require Subscription)
Supplementary

Article: The role of Fe-Ti oxide crystallization in the formation of A-type granitoids with implications for the Daly gap: An example from the Permian Baima igneous complex, SW China

TitleThe role of Fe-Ti oxide crystallization in the formation of A-type granitoids with implications for the Daly gap: An example from the Permian Baima igneous complex, SW China
Authors
KeywordsA-type granitoid
Daly gap
Emeishan large igneous province
Fe-Ti-V deposit
Layered mafic intrusion
Permian
SW China
Issue Date2009
PublisherElsevier BV. The Journal's web site is located at http://www.elsevier.com/locate/chemgeo
Citation
Chemical Geology, 2009, v. 259 n. 3-4, p. 204-217 How to Cite?
AbstractThe Baima igneous complex (BIC) is a member of the Permian Emeishan large igneous province, SW China, and is composed of a layered gabbroic unit and an isotropic syenitic unit. The gabbroic unit consists of four distinct zones, 1) lower cumulate zone, 2) massive Fe-Ti-V oxide ore zone, 3) olivine gabbro zone and 4) upper gabbro zone. SHRIMP zircon U-Pb dating results yield an age of 261 ± 2 Ma for the gabbroic unit, contemporaneous with the spatially associated syenitic unit. The gabbroic rocks show slightly LREE enriched patterns with (La/Yb)N values between 1.6 and 12.1 and positive Eu anomalies (Eu/Eu* = 1.1-3.6). In contrast, the syenites display stronger enrichments of LREE (La/YbN = 6.8-51.3) and negative Eu anomalies (Eu/Eu* = 0.3-1.1). Rocks of the syenitic unit are chemically similar to the ferroan alkalic A-type granitoids (K2O/Na2O = 0.58-0.80, FeOt/(FeOt +MgO) = 0.80-0.91) and have a within-plate geochemical signature. Both units have similar trace element ratios (Zr/Nb, Th/U, Ni/Co, Cu/Ni, Hf/Ta and Zn/Ga) resembling an ocean-island basalt source. The εNd(T) values for the gabbroic unit (εNd(T) = + 1.6-+ 4.2) and syenitic unit (εNd(T) = + 2.5-+ 3.2) are within the range of the high-Ti Emeishan flood basalts. The geochemical and geochronological data indicate that the gabbroic and syenitic units are comagmatic and cogenetic. Geochemical modeling suggests that the two units originated by fractional crystallization of a common parental magma that resembles the high-Ti Emeishan flood basalts. The formation of the two units by fractional crystallization was likely responsible for the enrichment of Fe-Ti-V oxide minerals in the gabbroic unit and thus the development of the Daly gap. The results of this study indicate that silica saturated peralkaline A-type granitoids can be formed by fractionation of mantle derived mafic magmas. © 2008 Elsevier B.V. All rights reserved.
Persistent Identifierhttp://hdl.handle.net/10722/58649
ISSN
2015 Impact Factor: 3.482
2015 SCImago Journal Rankings: 2.346
ISI Accession Number ID
Funding AgencyGrant Number
Academia Sinica post-doctoral Fellowship
Research Grant Council of Hong Kong, SARHKU7065/06P
Chinese 973 project2007CB411401
National Science Council of Taiwan96-2116 M-001-006
Institute of Earth Sciences, Academia Sinica
Funding Information:

We acknowledge the constructive reviews and comments of two anonymous reviewers and Editor Bernard Bourdon. We thank Professor Paul T. Robinson and Dr. Christina Y. Wang for reading earlier drafts of this manuscript. The authors would like to thank Professor Ma Yuxiao and Mr. Zhao Hao both from Chengdu University of Science and Technology for their field support and Mr. Liang QJ and Ms. Xiao Fu for their analytical support at the University of Hong Kong. This study is supported by Academia Sinica post-doctoral Fellowship to JGS and grants to MFZ from the Research Grant Council of Hong Kong, SAR (HKU7065/06P), Chinese 973 project (2007CB411401) and to GFZ from the National Science Council of Taiwan (NSC grant 96-2116 M-001-006) and the Institute of Earth Sciences, Academia Sinica.

References

 

DC FieldValueLanguage
dc.contributor.authorShellnutt, JGen_HK
dc.contributor.authorZhou, MFen_HK
dc.contributor.authorZellmer, GFen_HK
dc.date.accessioned2010-05-31T03:34:22Z-
dc.date.available2010-05-31T03:34:22Z-
dc.date.issued2009en_HK
dc.identifier.citationChemical Geology, 2009, v. 259 n. 3-4, p. 204-217en_HK
dc.identifier.issn0009-2541en_HK
dc.identifier.urihttp://hdl.handle.net/10722/58649-
dc.description.abstractThe Baima igneous complex (BIC) is a member of the Permian Emeishan large igneous province, SW China, and is composed of a layered gabbroic unit and an isotropic syenitic unit. The gabbroic unit consists of four distinct zones, 1) lower cumulate zone, 2) massive Fe-Ti-V oxide ore zone, 3) olivine gabbro zone and 4) upper gabbro zone. SHRIMP zircon U-Pb dating results yield an age of 261 ± 2 Ma for the gabbroic unit, contemporaneous with the spatially associated syenitic unit. The gabbroic rocks show slightly LREE enriched patterns with (La/Yb)N values between 1.6 and 12.1 and positive Eu anomalies (Eu/Eu* = 1.1-3.6). In contrast, the syenites display stronger enrichments of LREE (La/YbN = 6.8-51.3) and negative Eu anomalies (Eu/Eu* = 0.3-1.1). Rocks of the syenitic unit are chemically similar to the ferroan alkalic A-type granitoids (K2O/Na2O = 0.58-0.80, FeOt/(FeOt +MgO) = 0.80-0.91) and have a within-plate geochemical signature. Both units have similar trace element ratios (Zr/Nb, Th/U, Ni/Co, Cu/Ni, Hf/Ta and Zn/Ga) resembling an ocean-island basalt source. The εNd(T) values for the gabbroic unit (εNd(T) = + 1.6-+ 4.2) and syenitic unit (εNd(T) = + 2.5-+ 3.2) are within the range of the high-Ti Emeishan flood basalts. The geochemical and geochronological data indicate that the gabbroic and syenitic units are comagmatic and cogenetic. Geochemical modeling suggests that the two units originated by fractional crystallization of a common parental magma that resembles the high-Ti Emeishan flood basalts. The formation of the two units by fractional crystallization was likely responsible for the enrichment of Fe-Ti-V oxide minerals in the gabbroic unit and thus the development of the Daly gap. The results of this study indicate that silica saturated peralkaline A-type granitoids can be formed by fractionation of mantle derived mafic magmas. © 2008 Elsevier B.V. All rights reserved.en_HK
dc.languageengen_HK
dc.publisherElsevier BV. The Journal's web site is located at http://www.elsevier.com/locate/chemgeoen_HK
dc.relation.ispartofChemical Geologyen_HK
dc.subjectA-type granitoiden_HK
dc.subjectDaly gapen_HK
dc.subjectEmeishan large igneous provinceen_HK
dc.subjectFe-Ti-V depositen_HK
dc.subjectLayered mafic intrusionen_HK
dc.subjectPermianen_HK
dc.subjectSW Chinaen_HK
dc.titleThe role of Fe-Ti oxide crystallization in the formation of A-type granitoids with implications for the Daly gap: An example from the Permian Baima igneous complex, SW Chinaen_HK
dc.typeArticleen_HK
dc.identifier.openurlhttp://library.hku.hk:4550/resserv?sid=HKU:IR&issn=0009-2541&volume=259&issue=3-4&spage=204&epage=217&date=2009&atitle=The+role+of+Fe-Ti+oxide+crystallization+in+the+formation+of+A-type+granitoids+with+implications+for+the+Daly+gap:+an+example+from+the+Permian+Baima+igneous+complex,+SW+Chinaen_HK
dc.identifier.emailZhou, MF:mfzhou@hkucc.hku.hken_HK
dc.identifier.authorityZhou, MF=rp00844en_HK
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.doi10.1016/j.chemgeo.2008.10.044en_HK
dc.identifier.scopuseid_2-s2.0-59249083734en_HK
dc.identifier.hkuros167321en_HK
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-59249083734&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume259en_HK
dc.identifier.issue3-4en_HK
dc.identifier.spage204en_HK
dc.identifier.epage217en_HK
dc.identifier.isiWOS:000264060000010-
dc.publisher.placeNetherlandsen_HK
dc.identifier.scopusauthoridShellnutt, JG=17343022500en_HK
dc.identifier.scopusauthoridZhou, MF=7403506005en_HK
dc.identifier.scopusauthoridZellmer, GF=6602524350en_HK

Export via OAI-PMH Interface in XML Formats


OR


Export to Other Non-XML Formats