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Article: Late Triassic porphyritic intrusions and associated volcanic rocks from the Shangri-La region, Yidun terrane, Eastern Tibetan Plateau: Adakitic magmatism and porphyry copper mineralization

TitleLate Triassic porphyritic intrusions and associated volcanic rocks from the Shangri-La region, Yidun terrane, Eastern Tibetan Plateau: Adakitic magmatism and porphyry copper mineralization
Authors
KeywordsAdakite
Partial Melting
Porphyry
Slab Break-Off
Yidun
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. 24-38 How to Cite?
AbstractEarly Mesozoic porphyritic intrusions in the Shangri-La region, southern Yidun terrane, SW China, are spatially associated with andesites and dacites. These intrusions are composed of diorite and quartz diorite, and are closely related to copper mineralization. LA-ICP-MS zircon U-Pb ages of the intrusions range from 230 to 215Ma. The associated andesites and dacites are interlayered with slates and sandstones and have ages of around 220Ma. All of the intrusive and extrusive rocks have similar, highly fractionated REE patterns and high La/Yb (13-49) ratios with no prominent Eu anomalies. They display pronounced negative Nb-Ta and Ti anomalies on primitive mantle-normalized spidergrams. Their SiO 2 contents range from 56.6 to 67.1wt.%, Al 2O 3 from 14.2 to 17.4wt.% and MgO from 1.9 to 4.2wt.%. All the rocks have high Sr (258-1980ppm), and low Y (13-21ppm) with high Sr/Y ratios (29-102). These features suggest that both the volcanic rocks and porphyritic intrusions were derived from adakitic magmas. They have similar initial 87Sr/ 86Sr ratios (0.7058 to 0.7077) and εNd (-1.88 to -4.93) values, but belong to high silica (HSA) and low silica adakitic rocks (LSA). The HSA represent an early stage of magmatism (230 to 215Ma) and were derived from oceanic slab melts with limited interaction with the overlying mantle wedge during ascent. At 215Ma, more extensive interaction produced the LSA. We propose that the early adakitic magmas (HSA) formed by flat subduction leading to melting of oceanic slab, whereas subsequent slab break-off caused the significant interaction between slab melts and the mantle wedge and thus the generation of the later adakitic magmas (LSA). © 2011 Elsevier B.V.
Persistent Identifierhttp://hdl.handle.net/10722/151333
ISSN
2015 Impact Factor: 3.723
2015 SCImago Journal Rankings: 2.920
ISI Accession Number ID
Funding AgencyGrant Number
National Basic Research Program of China2009CB421001
Dr Stephen S.F. Hui Trust20093173005
111 ProjectB07011
Funding Information:

We acknowledge Mr. Jianfeng Gao and Dr. Xinfu Zhao for fruitful scientific discussions, Wei Chen for assistance in the field, and Xiao Fu, Liang Qi, Jianfeng Gao, Pingping Liu, and Wei Wang for their assistance in the laboratory. Constructive reviews by Prof. Robert Kerrich and an anonymous referee are gratefully acknowledged. We deeply thank Nelson Eby for editorial handling of the manuscript. This study was supported by the National Basic Research Program of China (2009CB421001), Dr Stephen S.F. Hui Trust Fund (20093173005) and the 111 Project (B07011).

References

 

DC FieldValueLanguage
dc.contributor.authorWang, BQen_US
dc.contributor.authorZhou, MFen_US
dc.contributor.authorLi, JWen_US
dc.contributor.authorYan, DPen_US
dc.date.accessioned2012-06-26T06:20:46Z-
dc.date.available2012-06-26T06:20:46Z-
dc.date.issued2011en_US
dc.identifier.citationLithos, 2011, v. 127 n. 1-2, p. 24-38en_US
dc.identifier.issn0024-4937en_US
dc.identifier.urihttp://hdl.handle.net/10722/151333-
dc.description.abstractEarly Mesozoic porphyritic intrusions in the Shangri-La region, southern Yidun terrane, SW China, are spatially associated with andesites and dacites. These intrusions are composed of diorite and quartz diorite, and are closely related to copper mineralization. LA-ICP-MS zircon U-Pb ages of the intrusions range from 230 to 215Ma. The associated andesites and dacites are interlayered with slates and sandstones and have ages of around 220Ma. All of the intrusive and extrusive rocks have similar, highly fractionated REE patterns and high La/Yb (13-49) ratios with no prominent Eu anomalies. They display pronounced negative Nb-Ta and Ti anomalies on primitive mantle-normalized spidergrams. Their SiO 2 contents range from 56.6 to 67.1wt.%, Al 2O 3 from 14.2 to 17.4wt.% and MgO from 1.9 to 4.2wt.%. All the rocks have high Sr (258-1980ppm), and low Y (13-21ppm) with high Sr/Y ratios (29-102). These features suggest that both the volcanic rocks and porphyritic intrusions were derived from adakitic magmas. They have similar initial 87Sr/ 86Sr ratios (0.7058 to 0.7077) and εNd (-1.88 to -4.93) values, but belong to high silica (HSA) and low silica adakitic rocks (LSA). The HSA represent an early stage of magmatism (230 to 215Ma) and were derived from oceanic slab melts with limited interaction with the overlying mantle wedge during ascent. At 215Ma, more extensive interaction produced the LSA. We propose that the early adakitic magmas (HSA) formed by flat subduction leading to melting of oceanic slab, whereas subsequent slab break-off caused the significant interaction between slab melts and the mantle wedge and thus the generation of the later adakitic magmas (LSA). © 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.subjectAdakiteen_US
dc.subjectPartial Meltingen_US
dc.subjectPorphyryen_US
dc.subjectSlab Break-Offen_US
dc.subjectYidunen_US
dc.titleLate Triassic porphyritic intrusions and associated volcanic rocks from the Shangri-La region, Yidun terrane, Eastern Tibetan Plateau: Adakitic magmatism and porphyry copper mineralizationen_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.2011.07.028en_US
dc.identifier.scopuseid_2-s2.0-80053636248en_US
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-80053636248&selection=ref&src=s&origin=recordpageen_US
dc.identifier.volume127en_US
dc.identifier.issue1-2en_US
dc.identifier.spage24en_US
dc.identifier.epage38en_US
dc.identifier.isiWOS:000298070600003-
dc.publisher.placeNetherlandsen_US
dc.identifier.scopusauthoridWang, BQ=52664680300en_US
dc.identifier.scopusauthoridZhou, MF=7403506005en_US
dc.identifier.scopusauthoridLi, JW=36067183300en_US
dc.identifier.scopusauthoridYan, DP=36683417500en_US

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