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Article: Chalcophile elemental constraints on sulfide-saturated fractionation of Cenozoic basalts and andesites in SE China

TitleChalcophile elemental constraints on sulfide-saturated fractionation of Cenozoic basalts and andesites in SE China
Authors
KeywordsAndesite
Basalt
Cenozoic
Platinum-Group Elements
Se China
Issue Date2011
PublisherElsevier BV. The Journal's web site is located at http://www.elsevier.com/locate/lithos
Citation
Lithos, 2011, v. 127 n. 1-2, p. 323-335 How to Cite?
AbstractCenozoic volcanic rocks are widespread in eastern China. These rocks have variable isotope compositions, reflecting different mantle sources under SE and NE China. In order to explore their PGE variations, chalcophile elements are determined for basalts from Leiqiong and Sanshui and andesites from Lianping in SE China. Basalts from Leiqiong have higher Ni (66-376 ppm) and Cu (30-73 ppm) contents than those from Lianping and Sanshui. All the samples have extremely low PGE contents, low Cu/Zr (< 1) and high Cu/Pd ratios (19,000-475,000), except for one olivine-rich sample with much higher PGE concentrations. All the samples have variable Pd/Ir (6.1-185) and Pt/Rh ratios (1.07-43). They are PGE-depleted relatively to Ni and Cu and have U-shaped and MORB-like primitive mantle-normalized chalcophile element patterns. Positive correlations of Ni and Cr with MgO in basalts from Leiqiong suggest fractionation of olivine and chromite. All samples have low Cu/Zr and high Cu/Pd ratios, implying that sulfides were segregated during magmatic evolution. Quantitative modeling indicates that the amounts of sulfide removed from the samples are smaller than that from MORB. Sanshui basalts are depleted in Ru and Pt, indicating fractionation of chromite with Fe-Pt alloys and/or accumulation of olivine with Ir alloys. A few Leiqiong and Lianping andesites may also have experienced fractionation of Fe-Pt alloys based on Pt depletions relative to Rh and Pd. Alternatively, the Pt depletion could also be an inherited feature of a metasomatic mantle source. Basalts from Sanshui have the highest and andesites from Lianping have the lowest Pd/Ir ratios, also consistent with a metasomatized source for the andesites in Lianping. The volcanic rocks from SE China show no strong Ir-depletions, unlike those from NE China. The absence of strong Ir-depletions is likely due to more oxidized SCLM beneath SE. © 2011 Elsevier B.V.
Persistent Identifierhttp://hdl.handle.net/10722/151331
ISSN
2015 Impact Factor: 3.723
2015 SCImago Journal Rankings: 2.920
ISI Accession Number ID
Funding AgencyGrant Number
Key Laboratory of Marine Hydrocarbon Resources and Environmental Geology, Ministry of Land and ResourcesMRE200908
China Ocean Mineral Resources RD AssociationDYXM-115-02-3-03
Natural Science Foundation of China40873020
Funding Information:

This study was funded by the Key Laboratory of Marine Hydrocarbon Resources and Environmental Geology, Ministry of Land and Resources (MRE200908), the China Ocean Mineral Resources R&D Association (DYXM-115-02-3-03) and the Natural Science Foundation of China (No. 40873020). The authors are grateful to Prof. Xiaolin Xiong and Zhaoyu Zhu and Dr. Jiangwei Han for providing the Leiqiong samples, to Ying Liu and Guangqian Hu for help with major and trace element analysis. The manuscript benefited greatly from discussions with Jianfeng Gao and Wei Terry Chen. We thank Prof. Eero Hanski and an anonymous reviewer for careful and constructive reviews and editor in-chief Dr Andrew Kerr for the helpful comments and suggestions. This is contribution No. IS-1384 from GIGCAS.

References

 

DC FieldValueLanguage
dc.contributor.authorYang, AYen_US
dc.contributor.authorZhao, TPen_US
dc.contributor.authorQi, Len_US
dc.contributor.authorYang, SHen_US
dc.contributor.authorZhou, MFen_US
dc.date.accessioned2012-06-26T06:20:43Z-
dc.date.available2012-06-26T06:20:43Z-
dc.date.issued2011en_US
dc.identifier.citationLithos, 2011, v. 127 n. 1-2, p. 323-335en_US
dc.identifier.issn0024-4937en_US
dc.identifier.urihttp://hdl.handle.net/10722/151331-
dc.description.abstractCenozoic volcanic rocks are widespread in eastern China. These rocks have variable isotope compositions, reflecting different mantle sources under SE and NE China. In order to explore their PGE variations, chalcophile elements are determined for basalts from Leiqiong and Sanshui and andesites from Lianping in SE China. Basalts from Leiqiong have higher Ni (66-376 ppm) and Cu (30-73 ppm) contents than those from Lianping and Sanshui. All the samples have extremely low PGE contents, low Cu/Zr (< 1) and high Cu/Pd ratios (19,000-475,000), except for one olivine-rich sample with much higher PGE concentrations. All the samples have variable Pd/Ir (6.1-185) and Pt/Rh ratios (1.07-43). They are PGE-depleted relatively to Ni and Cu and have U-shaped and MORB-like primitive mantle-normalized chalcophile element patterns. Positive correlations of Ni and Cr with MgO in basalts from Leiqiong suggest fractionation of olivine and chromite. All samples have low Cu/Zr and high Cu/Pd ratios, implying that sulfides were segregated during magmatic evolution. Quantitative modeling indicates that the amounts of sulfide removed from the samples are smaller than that from MORB. Sanshui basalts are depleted in Ru and Pt, indicating fractionation of chromite with Fe-Pt alloys and/or accumulation of olivine with Ir alloys. A few Leiqiong and Lianping andesites may also have experienced fractionation of Fe-Pt alloys based on Pt depletions relative to Rh and Pd. Alternatively, the Pt depletion could also be an inherited feature of a metasomatic mantle source. Basalts from Sanshui have the highest and andesites from Lianping have the lowest Pd/Ir ratios, also consistent with a metasomatized source for the andesites in Lianping. The volcanic rocks from SE China show no strong Ir-depletions, unlike those from NE China. The absence of strong Ir-depletions is likely due to more oxidized SCLM beneath SE. © 2011 Elsevier B.V.en_US
dc.languageengen_US
dc.publisherElsevier BV. The Journal's web site is located at http://www.elsevier.com/locate/lithosen_US
dc.relation.ispartofLithosen_US
dc.subjectAndesiteen_US
dc.subjectBasalten_US
dc.subjectCenozoicen_US
dc.subjectPlatinum-Group Elementsen_US
dc.subjectSe Chinaen_US
dc.titleChalcophile elemental constraints on sulfide-saturated fractionation of Cenozoic basalts and andesites in SE Chinaen_US
dc.typeArticleen_US
dc.identifier.emailZhou, MF:mfzhou@hkucc.hku.hken_US
dc.identifier.authorityZhou, MF=rp00844en_US
dc.description.naturelink_to_subscribed_fulltexten_US
dc.identifier.doi10.1016/j.lithos.2011.08.016en_US
dc.identifier.scopuseid_2-s2.0-80053627278en_US
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-80053627278&selection=ref&src=s&origin=recordpageen_US
dc.identifier.volume127en_US
dc.identifier.issue1-2en_US
dc.identifier.spage323en_US
dc.identifier.epage335en_US
dc.identifier.isiWOS:000298070600021-
dc.publisher.placeNetherlandsen_US
dc.identifier.scopusauthoridYang, AY=54789354800en_US
dc.identifier.scopusauthoridZhao, TP=35730612500en_US
dc.identifier.scopusauthoridQi, L=7202149924en_US
dc.identifier.scopusauthoridYang, SH=49261330000en_US
dc.identifier.scopusauthoridZhou, MF=7403506005en_US
dc.identifier.citeulike9824262-

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