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Origin, age and petrogenesis of barren (low-grade) granitoids from the Bezenjan-Bardsir magmatic complex, southeast of the Urumieh-Dokhtar magmatic belt, Iran
Sepidbar, Fatemeh1; Ao, Songjian2; Palin, Richard M.3; Li, Qiu-Li2; Zhang, Zhaofeng4
2019
Source PublicationORE GEOLOGY REVIEWS
ISSN0169-1368
Volume104Pages:132-147
AbstractThe Bezenjan-Bardsir magmatic complex (BBMC), situated at the southeastern part of the Urumieh-Dokhtar magmatic belt, includes a thick pile of volcanic rocks intruded by younger granitoids. The granitoids have granodioritic to quartz-monzonitic composition, while volcanic rocks are petrologically classified as basaltic andesite, andesite, dacite, rhyodacite, and rhyolite. In this study, U-Pb zircon geochronology, whole-rock geochemistry, and Sr-Nd isotopic analyses were performed on a wide range of granitoids exposed within the BBMC. This geochronology indicates that barren magmatism occurred during the Middle to Late Oligocene (29-23 Ma), followed by large-scale Cu mineralization during the Late Miocene. These BBMC rocks have strong depletions in Nb (2.5-17.3 ppm) and enrichments in light rare earth elements and large ion lithophile elements compared to N-MORB. Their normal calc-alkaline arc geochemical signature (low Sr/Y ratio of almost < 55), negative Eu anomalies (Eu/Eu* = 0.6-1), enrichment in HFSE and the negative to positive epsilon Nd (t) values of -1.23 to + 3.17, the Nd model ages (0.43-0.72 Ga) and radiogenic Sr isotope signatures (Sr-87/Sr-86 = 0.7048-0.7063) suggest generation in a subduction zone setting; however, productive rocks elsewhere within the UDMB exhibit adakite-like talc-alkaline magmatic characteristics (high Sr and Sr/Y, but low Y). The BBMC igneous rocks show low Sr/Y (14.6-45.2), zircon Ce-(IV)/Ce-(III) (12-703), and Eu/Eu* (0.08-0.64) ratios, negative to slightly positive Eu anomalies, and enrichment in HFSE and 87Sr/86Sr, in agreement with other barren-type magmas through the UDMB. An integrated geochemical, petrological, and tectonic model suggests that barren magmatism in the BBMC was likely associated with partial melting of juvenile lower crust (amphibolite) due to northwestward subduction of the Neo-Tethys oceanic lithosphere, whereas productive adakitic rocks within the UDMB formed by partial melting of thickened lower crust (garnet-amphibolite).
KeywordNormal arc magmatism Bardsir-Bezenjan magmatic complex Barren magma Partial melting
DOI10.1016/j.oregeorev.2018.10.008
Funding OrganizationNational Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China
WOS KeywordPORPHYRY COPPER-DEPOSITS ; ZIRCON U-PB ; TRACE-ELEMENT COMPOSITION ; SLAB-DERIVED MELTS ; CALC-ALKALINE ; TECTONIC EVOLUTION ; PLUTONIC COMPLEX ; MANTLE WEDGE ; ARC MAGMAS ; FLARE-UP
Language英语
Funding ProjectNational Natural Science Foundation of China[41472192]
Funding OrganizationNational Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China
WOS Research AreaGeology ; Mineralogy ; Mining & Mineral Processing
WOS SubjectGeology ; Mineralogy ; Mining & Mineral Processing
WOS IDWOS:000460710600009
PublisherELSEVIER SCIENCE BV
Citation statistics
Document Type期刊论文
Identifierhttp://ir.iggcas.ac.cn/handle/132A11/90908
Collection岩石圈演化国家重点实验室
Corresponding AuthorSepidbar, Fatemeh
Affiliation1.China Univ Geosci, State Key Lab Geol Proc & Mineral Resources, Sch Earth Sci, Wuhan 430047, Hubei, Peoples R China
2.Chinese Acad Sci, State Key Lab Lithospher Evolut, Inst Geol & Geophys, Beijing 100029, Peoples R China
3.Colorado Sch Mines, Dept Geol & Geol Engn, Golden, CO 80401 USA
4.Chinese Acad Sci, State Key Lab Isotope Geochem, Guangzhou Inst Geochem, Guangzhou 510640, Guangdong, Peoples R China
Recommended Citation
GB/T 7714
Sepidbar, Fatemeh,Ao, Songjian,Palin, Richard M.,et al. Origin, age and petrogenesis of barren (low-grade) granitoids from the Bezenjan-Bardsir magmatic complex, southeast of the Urumieh-Dokhtar magmatic belt, Iran[J]. ORE GEOLOGY REVIEWS,2019,104:132-147.
APA Sepidbar, Fatemeh,Ao, Songjian,Palin, Richard M.,Li, Qiu-Li,&Zhang, Zhaofeng.(2019).Origin, age and petrogenesis of barren (low-grade) granitoids from the Bezenjan-Bardsir magmatic complex, southeast of the Urumieh-Dokhtar magmatic belt, Iran.ORE GEOLOGY REVIEWS,104,132-147.
MLA Sepidbar, Fatemeh,et al."Origin, age and petrogenesis of barren (low-grade) granitoids from the Bezenjan-Bardsir magmatic complex, southeast of the Urumieh-Dokhtar magmatic belt, Iran".ORE GEOLOGY REVIEWS 104(2019):132-147.
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