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Article: Geochronology and geochemistry of Late Paleozoic magmatic rocks in the Lamasu-Dabate area, northwestern Tianshan (west China): evidence for a tectonic transition from arc to post-collisional setting

TitleGeochronology and geochemistry of Late Paleozoic magmatic rocks in the Lamasu-Dabate area, northwestern Tianshan (west China): evidence for a tectonic transition from arc to post-collisional setting
Authors
KeywordsAdakite
Arc-arc collision
Arc-continent collision
Carboniferous
Collision zone
Issue Date2010
PublisherElsevier BV. The Journal's web site is located at http://www.elsevier.com/locate/lithos
Citation
Lithos, 2010, v. 119 n. 3-4, p. 393-411 How to Cite?
AbstractVoluminous Late Paleozoic igneous rocks and associated Cu-Au-Mo deposits occur in the northwestern Tianshan district, Xinjiang, west China. However, the tectonic setting and petrogenesis of these rocks remain controversial. This paper reports zircon U-Pb and Hf CUU isotopic data, major and trace elements, and Sr-Nd-Pb isotopic data for the intrusive rocks and minor dacites in the Lamasu-Dabate area of northwestern Tianshan adjacent to the Cu-Au-Mo deposits. LA-ICPMS U-Pb zircon analyses suggest that the Lamasu porphyries were formed at 366±3Ma and contain 907-738Ma inherited zircons, the Dabate dacites were formed at 316±4Ma, and granite porphyries were formed at 289±3Ma with 319Ma inherited zircons. The Lamasu porphyries consist of plagioclase granite and granodiorite, and are geochemically similar to adakites, e.g., having high Al 2O 3 (14.54-19.75wt.%) and Sr (308-641ppm) and low Y (7.84-16.9ppm) contents, with fractionated rare earth element (REE) patterns and slightly positive Sr anomalies. However, they have variable initial ratios of 87Sr/ 86Sr (0.7072-0.7076) and 206Pb/ 204Pb (18.139-18.450), and variable ε Nd(t) (-5.6 to -0.8) and positive ε Hf(t) (+1.4 to +10.6) values. They also have variable Mg # (100×Mg 2+/(Mg 2++Fe 2+)) (41-73) and low Th (3.13-8.09) and Th/Ce (0.14-0.28) values. We suggest that the Lamasu adakitic magmas were generated through partial melting of southward subducted Junggar oceanic crust, with subsequent melt-mantle interaction and assimilation of basement rocks. The Dabate dacites show typical arc-like geochemical characteristics (e.g., enrichment of large ion lithophile elements (LILE) and strong negative anomalies of Ta, Nb, P and Ti), with variable ε Nd(t) (+0.1 to +3.3). They were probably generated by melting of juvenile basaltic lower crust as a result of magma underplating. The Dabate granite porphyries are geochemically similar to A 2-type granites, e.g., high SiO 2 (75.6-77.6wt.%) and alkalis (Na 2O+K 2O=8.27-8.70wt.%), low CaO (0.28-0.34wt.%) and Mg # (2-10), and obvious negative Eu, Ba and Sr anomalies. They have variable values of ε Nd(t) (-1.7 to 0) and 206Pb/ 204Pb i (18.567-18.721) and zircon ε Hf(t) (+0.5 to +11.1). The Dabate A-type granite porphyries contain Late Carboniferous residual zircon cores, suggesting that their source rock possibly contained Carboniferous arc igneous rocks. Taking into account all available data from Late Paleozoic magmatic rocks and Cu-Mo-Au mineralization in the northern Tianshan district, we suggest that the Dabate-Lamasu area was a continental arc during the Late Devonian-Carboniferous but had entered a post-collisional stage by the Early-Permian (290Ma). © 2010 Elsevier B.V.
Persistent Identifierhttp://hdl.handle.net/10722/151311
ISSN
2015 Impact Factor: 3.723
2015 SCImago Journal Rankings: 2.920
ISI Accession Number ID
Funding AgencyGrant Number
Major State Basic Research Program (973 Program) of People's Republic of China2007CB411308
National Natural Science Foundation of China40721063
Chinese Academy of SciencesKZCX2-YW-128
Institute for Geoscience Research (TIGeR) at Curtin University of Technology
Funding Information:

We sincerely thank Professor Nelson Eby and two anonymous reviewers for their constructive and helpful reviews. We appreciate the assistance of Professors Liu Yongsheng and Yang Jinhui, and Ms./Mr. Yang Yueheng, Xie Liewei, Chen Haihong, Liu Ying, Hu Guangqian, Ma Jinlong, Liang Xirong and Tu Xianglin for geochronological and geochemical analyses. This study was jointly supported by the Major State Basic Research Program (973 Program) of People's Republic of China (No. 2007CB411308), the National Natural Science Foundation of China (Grant No. 40721063), the Knowledge Innovation Program of Chinese Academy of Sciences (KZCX2-YW-128), and the Institute for Geoscience Research (TIGeR) at Curtin University of Technology. This is contribution No. IS-1228 from GIGCAS and TIGeR publication #227.

References

 

DC FieldValueLanguage
dc.contributor.authorTang, GJen_US
dc.contributor.authorWang, Qen_US
dc.contributor.authorWyman, DAen_US
dc.contributor.authorSun, Men_US
dc.contributor.authorLi, ZXen_US
dc.contributor.authorZhao, ZHen_US
dc.contributor.authorSun, WDen_US
dc.contributor.authorJia, XHen_US
dc.contributor.authorJiang, ZQen_US
dc.date.accessioned2012-06-26T06:20:27Z-
dc.date.available2012-06-26T06:20:27Z-
dc.date.issued2010en_US
dc.identifier.citationLithos, 2010, v. 119 n. 3-4, p. 393-411en_US
dc.identifier.issn0024-4937en_US
dc.identifier.urihttp://hdl.handle.net/10722/151311-
dc.description.abstractVoluminous Late Paleozoic igneous rocks and associated Cu-Au-Mo deposits occur in the northwestern Tianshan district, Xinjiang, west China. However, the tectonic setting and petrogenesis of these rocks remain controversial. This paper reports zircon U-Pb and Hf CUU isotopic data, major and trace elements, and Sr-Nd-Pb isotopic data for the intrusive rocks and minor dacites in the Lamasu-Dabate area of northwestern Tianshan adjacent to the Cu-Au-Mo deposits. LA-ICPMS U-Pb zircon analyses suggest that the Lamasu porphyries were formed at 366±3Ma and contain 907-738Ma inherited zircons, the Dabate dacites were formed at 316±4Ma, and granite porphyries were formed at 289±3Ma with 319Ma inherited zircons. The Lamasu porphyries consist of plagioclase granite and granodiorite, and are geochemically similar to adakites, e.g., having high Al 2O 3 (14.54-19.75wt.%) and Sr (308-641ppm) and low Y (7.84-16.9ppm) contents, with fractionated rare earth element (REE) patterns and slightly positive Sr anomalies. However, they have variable initial ratios of 87Sr/ 86Sr (0.7072-0.7076) and 206Pb/ 204Pb (18.139-18.450), and variable ε Nd(t) (-5.6 to -0.8) and positive ε Hf(t) (+1.4 to +10.6) values. They also have variable Mg # (100×Mg 2+/(Mg 2++Fe 2+)) (41-73) and low Th (3.13-8.09) and Th/Ce (0.14-0.28) values. We suggest that the Lamasu adakitic magmas were generated through partial melting of southward subducted Junggar oceanic crust, with subsequent melt-mantle interaction and assimilation of basement rocks. The Dabate dacites show typical arc-like geochemical characteristics (e.g., enrichment of large ion lithophile elements (LILE) and strong negative anomalies of Ta, Nb, P and Ti), with variable ε Nd(t) (+0.1 to +3.3). They were probably generated by melting of juvenile basaltic lower crust as a result of magma underplating. The Dabate granite porphyries are geochemically similar to A 2-type granites, e.g., high SiO 2 (75.6-77.6wt.%) and alkalis (Na 2O+K 2O=8.27-8.70wt.%), low CaO (0.28-0.34wt.%) and Mg # (2-10), and obvious negative Eu, Ba and Sr anomalies. They have variable values of ε Nd(t) (-1.7 to 0) and 206Pb/ 204Pb i (18.567-18.721) and zircon ε Hf(t) (+0.5 to +11.1). The Dabate A-type granite porphyries contain Late Carboniferous residual zircon cores, suggesting that their source rock possibly contained Carboniferous arc igneous rocks. Taking into account all available data from Late Paleozoic magmatic rocks and Cu-Mo-Au mineralization in the northern Tianshan district, we suggest that the Dabate-Lamasu area was a continental arc during the Late Devonian-Carboniferous but had entered a post-collisional stage by the Early-Permian (290Ma). © 2010 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.subjectArc-arc collisionen_US
dc.subjectArc-continent collisionen_US
dc.subjectCarboniferousen_US
dc.subjectCollision zoneen_US
dc.titleGeochronology and geochemistry of Late Paleozoic magmatic rocks in the Lamasu-Dabate area, northwestern Tianshan (west China): evidence for a tectonic transition from arc to post-collisional settingen_US
dc.typeArticleen_US
dc.identifier.emailWang, Q: wqiang@gig.ac.cnen_US
dc.identifier.emailSun, M: minsun@hku.hk-
dc.identifier.authoritySun, M=rp00780en_US
dc.description.naturelink_to_subscribed_fulltexten_US
dc.identifier.doi10.1016/j.lithos.2010.07.010en_US
dc.identifier.scopuseid_2-s2.0-77956909853en_US
dc.identifier.hkuros205424-
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-77956909853&selection=ref&src=s&origin=recordpageen_US
dc.identifier.volume119en_US
dc.identifier.issue3-4en_US
dc.identifier.spage393en_US
dc.identifier.epage411en_US
dc.identifier.isiWOS:000283462000015-
dc.publisher.placeNetherlandsen_US
dc.identifier.scopusauthoridJiang, ZQ=49061110100en_US
dc.identifier.scopusauthoridJia, XH=49061213800en_US
dc.identifier.scopusauthoridSun, WD=7404011201en_US
dc.identifier.scopusauthoridZhao, ZH=7404149280en_US
dc.identifier.scopusauthoridLi, ZX=36072768900en_US
dc.identifier.scopusauthoridSun, M=25932315800en_US
dc.identifier.scopusauthoridWyman, DA=7006471092en_US
dc.identifier.scopusauthoridWang, Q=34881029200en_US
dc.identifier.scopusauthoridTang, GJ=23478676100en_US
dc.identifier.citeulike7581925-

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