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Article: Magmatic evidence for middle-late Permian tectonic evolution on the northern margin of the North China Craton

TitleMagmatic evidence for middle-late Permian tectonic evolution on the northern margin of the North China Craton
Authors
KeywordsA-type magmatism
Final closure
Paleo-Asian Ocean
Post-collisional extension
Issue Date2019
PublisherElsevier BV. The Journal's web site is located at http://www.elsevier.com/locate/lithos
Citation
Lithos, 2019, v. 336-337, p. 125-142 How to Cite?
AbstractLate Paleozoic tectonic evolution of the northern margin of the North China Craton (NCC) remains controversial, especially for the mechanism and time during the late-stage oceanic consumption of the Paleo-Asian Ocean (PAO). We address this issue through geochronological, geochemical and Lu-Hf isotopic studies on felsic-mafic volcanic rock suites and granite plutons from the Damao area in the western segment of the NCC's northern margin. Zircon U-Pb dating reveals that the volcanic suites, with eruptive unconformities in-between, erupted primarily at ~275–260 Ma while the granites emplaced later at ~255 Ma. The volcanic rocks contain rhyolites and dacites having an A-type affinity with high FeOt/MgO, (K 2 O + Na 2 O)/CaO and Ga/Al ratios, enriched Th, U, Zr, Hf and depleted Ba, Sr and Eu contents. The basaltic rocks display low MgO and TiO 2 contents, negative Nb, Ta, Ti anomalies, as well as negative Ɛ Hf (t) values. We suggest that the ~275–260 Ma volcanic suites were generated in a post-collisional setting, with the dominant rhyolites and dacites derived from the mixing between mantle and crustal magmas and subordinate basalts from the partial melting of enriched sub-continental lithospheric mantle. The sudden and intensive occurrence of these ~275–260 Ma felsic-dominant bimodal post-collisional magmatism and their sudden increase of zircon Ɛ Hf (t) values imply a significant mantle contribution to their sources, possibly due to the slab breakoff of the subducting PAO plate. The ~255 Ma granites also have an A-type affinity and a large spread of negative Ɛ Hf (t) values (−3.6 to −30.5), indicating a prominent involvement of continental crust materials that was likely related to crustal reworking after the slab breakoff. Overall, these ~275–255 Ma magmatic suites document a significant post-collisional crustal extension at the western segment of the northern NCC. In this region the southward subduction of the PAO likely ceased prior to ~275 Ma on the basis of a regional comparison. © 2019 Elsevier B.V.
Persistent Identifierhttp://hdl.handle.net/10722/274947
ISSN
2017 Impact Factor: 3.857
2015 SCImago Journal Rankings: 2.920
ISI Accession Number ID

 

DC FieldValueLanguage
dc.contributor.authorZhou, H-
dc.contributor.authorZhao, G-
dc.contributor.authorLi, J-
dc.contributor.authorHan, Y-
dc.contributor.authorYao, J-
dc.contributor.authorWang, B-
dc.date.accessioned2019-09-10T02:32:11Z-
dc.date.available2019-09-10T02:32:11Z-
dc.date.issued2019-
dc.identifier.citationLithos, 2019, v. 336-337, p. 125-142-
dc.identifier.issn0024-4937-
dc.identifier.urihttp://hdl.handle.net/10722/274947-
dc.description.abstractLate Paleozoic tectonic evolution of the northern margin of the North China Craton (NCC) remains controversial, especially for the mechanism and time during the late-stage oceanic consumption of the Paleo-Asian Ocean (PAO). We address this issue through geochronological, geochemical and Lu-Hf isotopic studies on felsic-mafic volcanic rock suites and granite plutons from the Damao area in the western segment of the NCC's northern margin. Zircon U-Pb dating reveals that the volcanic suites, with eruptive unconformities in-between, erupted primarily at ~275–260 Ma while the granites emplaced later at ~255 Ma. The volcanic rocks contain rhyolites and dacites having an A-type affinity with high FeOt/MgO, (K 2 O + Na 2 O)/CaO and Ga/Al ratios, enriched Th, U, Zr, Hf and depleted Ba, Sr and Eu contents. The basaltic rocks display low MgO and TiO 2 contents, negative Nb, Ta, Ti anomalies, as well as negative Ɛ Hf (t) values. We suggest that the ~275–260 Ma volcanic suites were generated in a post-collisional setting, with the dominant rhyolites and dacites derived from the mixing between mantle and crustal magmas and subordinate basalts from the partial melting of enriched sub-continental lithospheric mantle. The sudden and intensive occurrence of these ~275–260 Ma felsic-dominant bimodal post-collisional magmatism and their sudden increase of zircon Ɛ Hf (t) values imply a significant mantle contribution to their sources, possibly due to the slab breakoff of the subducting PAO plate. The ~255 Ma granites also have an A-type affinity and a large spread of negative Ɛ Hf (t) values (−3.6 to −30.5), indicating a prominent involvement of continental crust materials that was likely related to crustal reworking after the slab breakoff. Overall, these ~275–255 Ma magmatic suites document a significant post-collisional crustal extension at the western segment of the northern NCC. In this region the southward subduction of the PAO likely ceased prior to ~275 Ma on the basis of a regional comparison. © 2019 Elsevier B.V.-
dc.languageeng-
dc.publisherElsevier BV. The Journal's web site is located at http://www.elsevier.com/locate/lithos-
dc.relation.ispartofLithos-
dc.subjectA-type magmatism-
dc.subjectFinal closure-
dc.subjectPaleo-Asian Ocean-
dc.subjectPost-collisional extension-
dc.titleMagmatic evidence for middle-late Permian tectonic evolution on the northern margin of the North China Craton-
dc.typeArticle-
dc.identifier.emailZhao, G: gzhao@hku.hk-
dc.identifier.authorityZhao, G=rp00842-
dc.description.naturelink_to_subscribed_fulltext-
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.doi10.1016/j.lithos.2019.04.002-
dc.identifier.scopuseid_2-s2.0-85064071022-
dc.identifier.hkuros302935-
dc.identifier.volume336-337-
dc.identifier.spage125-
dc.identifier.epage142-
dc.identifier.isiWOS:000470043100009-
dc.publisher.placeNetherlands-

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