File Download

There are no files associated with this item.

  Links for fulltext
     (May Require Subscription)
Supplementary

Article: Origin, ascent and oblique emplacement of magmas in a thickened crust: An example from the Cretaceous Fangshan adakitic pluton, Beijing

TitleOrigin, ascent and oblique emplacement of magmas in a thickened crust: An example from the Cretaceous Fangshan adakitic pluton, Beijing
Authors
KeywordsEast China
Ellipsoidal enclaves
Fabrics
Fangshan adakitic pluton
Thickened crust
Issue Date2011
PublisherElsevier BV. The Journal's web site is located at http://www.elsevier.com/locate/lithos
Citation
Lithos, 2011, v. 123 n. 1-4, p. 102-120 How to Cite?
AbstractThe Fangshan pluton in the Western Hills of Beijing records a history of emplacement from primarily vertical (ascent) to oblique injection along a detachment fault. Thus, the pluton provides a classic example answering the "room" problem. This pluton and the Nanjiao apophyse were produced by Cretaceous magmatism that formed the regionally extrusive East China Mesozoic igneous province. The Fangshan pluton includes two intrusive phases, a 136-Ma monzodiorite phase intruded by a 131-Ma quartz monzodiorite phase. Rocks from both phases have chondrite-normalized REE patterns enriched in LREE and depleted in HREE. They have primitive mantle-normalized trace element patterns with distinct negative Nb and Ti anomalies and high Sr (1067-1348. ppm) and low Y (8-17. ppm) with high Sr/Y ratios (71-137). These features are characteristic of adakites and suggest that the magmas were derived by partial melting of the lower part of a thickened continental crust.The pluton has magmatic foliations and lineation, indicative of the intrusion of the earlier magmas slightly obliquely from SE to NW. The magmatic fabrics have enclave ratios R fmag+R p of 3.0-3.5. Asymmetric solid-state deformational fabrics and strains (R s) for the northwestern (3.5-4.0) and southeastern parts (1.5-2.0) again suggest a later oblique injection of magmas from SE to NW.Both the Fangshan pluton and Nanjiao apophyse suggest that magmas migrated most probably along the pre-existing detachment fault. Such an emplacement is also supported by the aeromagnetic polarization data and strong deformation of the Beiling syncline. Thus, magma emplacement in the Fangshan pluton probably involved creation of space by both faulting and wallrock strain. © 2010 Elsevier B.V.
Persistent Identifierhttp://hdl.handle.net/10722/139215
ISSN
2015 Impact Factor: 3.723
2015 SCImago Journal Rankings: 2.920
ISI Accession Number ID
Funding AgencyGrant Number
Natural Science Foundation of China40921062
40872140
National Basic Research Program of China2009CB421001
111 ProjectB07011
Funding Information:

This study was supported by the Natural Science Foundation of China (40921062, 40872140), National Basic Research Program of China (2009CB421001) and the 111 Project (B07011). We have benefited from helpful discussions with Profs. Zhaoren Fu and Changhou Zhang during the study. Thanks are due to Ms. Xiao Fu, Dr. Weihua Sun and Prof. Yu Wang for laboratory work. Enlightening discussions and assistance throughout this study by Prof. P.T. Robinson and reading an earlier draft of this paper by several colleagues, and constructive comments and suggestions on the manuscript by two anonymous reviewers and Editors are very much appreciated.

References

 

DC FieldValueLanguage
dc.contributor.authorYan, DPen_HK
dc.contributor.authorZhou, MFen_HK
dc.contributor.authorZhao, Den_HK
dc.contributor.authorLi, JWen_HK
dc.contributor.authorWang, GHen_HK
dc.contributor.authorWang, CLen_HK
dc.contributor.authorQi, Len_HK
dc.date.accessioned2011-09-23T05:47:12Z-
dc.date.available2011-09-23T05:47:12Z-
dc.date.issued2011en_HK
dc.identifier.citationLithos, 2011, v. 123 n. 1-4, p. 102-120en_HK
dc.identifier.issn0024-4937en_HK
dc.identifier.urihttp://hdl.handle.net/10722/139215-
dc.description.abstractThe Fangshan pluton in the Western Hills of Beijing records a history of emplacement from primarily vertical (ascent) to oblique injection along a detachment fault. Thus, the pluton provides a classic example answering the "room" problem. This pluton and the Nanjiao apophyse were produced by Cretaceous magmatism that formed the regionally extrusive East China Mesozoic igneous province. The Fangshan pluton includes two intrusive phases, a 136-Ma monzodiorite phase intruded by a 131-Ma quartz monzodiorite phase. Rocks from both phases have chondrite-normalized REE patterns enriched in LREE and depleted in HREE. They have primitive mantle-normalized trace element patterns with distinct negative Nb and Ti anomalies and high Sr (1067-1348. ppm) and low Y (8-17. ppm) with high Sr/Y ratios (71-137). These features are characteristic of adakites and suggest that the magmas were derived by partial melting of the lower part of a thickened continental crust.The pluton has magmatic foliations and lineation, indicative of the intrusion of the earlier magmas slightly obliquely from SE to NW. The magmatic fabrics have enclave ratios R fmag+R p of 3.0-3.5. Asymmetric solid-state deformational fabrics and strains (R s) for the northwestern (3.5-4.0) and southeastern parts (1.5-2.0) again suggest a later oblique injection of magmas from SE to NW.Both the Fangshan pluton and Nanjiao apophyse suggest that magmas migrated most probably along the pre-existing detachment fault. Such an emplacement is also supported by the aeromagnetic polarization data and strong deformation of the Beiling syncline. Thus, magma emplacement in the Fangshan pluton probably involved creation of space by both faulting and wallrock strain. © 2010 Elsevier B.V.en_HK
dc.languageengen_US
dc.publisherElsevier BV. The Journal's web site is located at http://www.elsevier.com/locate/lithosen_HK
dc.relation.ispartofLithosen_HK
dc.subjectEast Chinaen_HK
dc.subjectEllipsoidal enclavesen_HK
dc.subjectFabricsen_HK
dc.subjectFangshan adakitic plutonen_HK
dc.subjectThickened crusten_HK
dc.titleOrigin, ascent and oblique emplacement of magmas in a thickened crust: An example from the Cretaceous Fangshan adakitic pluton, Beijingen_HK
dc.typeArticleen_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.lithos.2010.11.015en_HK
dc.identifier.scopuseid_2-s2.0-79952535908en_HK
dc.identifier.hkuros195322en_US
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-79952535908&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume123en_HK
dc.identifier.issue1-4en_HK
dc.identifier.spage102en_HK
dc.identifier.epage120en_HK
dc.identifier.isiWOS:000289335800008-
dc.publisher.placeNetherlandsen_HK
dc.identifier.scopusauthoridYan, DP=36683417500en_HK
dc.identifier.scopusauthoridZhou, MF=7403506005en_HK
dc.identifier.scopusauthoridZhao, D=36509465000en_HK
dc.identifier.scopusauthoridLi, JW=36067183300en_HK
dc.identifier.scopusauthoridWang, GH=49965092400en_HK
dc.identifier.scopusauthoridWang, CL=49161361600en_HK
dc.identifier.scopusauthoridQi, L=7202149924en_HK
dc.identifier.citeulike8402544-

Export via OAI-PMH Interface in XML Formats


OR


Export to Other Non-XML Formats