DOI: 10.1007/s00531-013-0959-4
论文题名: Sr-Nd isotope geochemistry and tectonomagmatic setting of the Dehsalm Cu-Mo porphyry mineralizing intrusives from Lut Block, eastern Iran
作者: Arjmandzadeh R. ; Santos J.F.
刊名: International Journal of Earth Sciences
出版年: 2014
卷: 103, 期: 1 起始页码: 123
结束页码: 140
语种: 英语
英文关键词: High-K calc-alkaline to shoshonitic magmas
; Lut Block
; Porphyry deposits
; Rb-Sr age
; Sr and Nd isotopes
; Trace element geochemistry
Scopus关键词: age determination
; calc alkaline rock
; chemical composition
; continental arc
; geochemistry
; granitoid
; igneous intrusion
; isotopic composition
; mineralization
; neodymium isotope
; porphyry
; potassium
; rubidium-strontium dating
; strontium isotope
; tectonic setting
; trace element
; Iran
; Lot Block
; Araneae
英文摘要: The Dehsalm Cu-Mo-bearing porphyritic granitoids belong to the Lut Block volcanic-plutonic belt (central eastern Iran). These rocks range in composition from gabbro-diorite to granite, with dominance of monzonites and quartz monzonites, and have geochemical features of high-K calc-alkaline to shoshonitic volcanic arc suites. Primitive mantle-normalized trace element spider diagrams display strong enrichment in large-ion lithophile elements such as Rb, Ba and Cs and depletions in some high-field strength elements, e.g., Nb, Ti, Y and HREE. Chondrite-normalized plots display significant LREE enrichments, high LaN/YbN and a lack of Eu anomaly. High Sr/Y and La/Yb ratios of Dehsalm intrusives reveal that, despite their K-rich composition, these granitoids show some resemblances with adakitic rocks. A Rb-Sr whole rock-feldspar-biotite age of 33 ± 1 Ma was obtained in a quartz monzonite sample and coincides, within error, with a previous geochronological result in Chah-Shaljami granitoids, further northwest within the Lut Block. (87Sr/86Sr)i and εNdi isotopic ratios range from 0.70481 to 0.70508 and from +1.5 to +2.5, respectively, which fits into a supra-subduction mantle wedge source for the parental melts and indicates that crustal contribution for magma diversification was of limited importance. Sr and Nd isotopic compositions together with major and trace element geochemistry point to an origin of the parental magmas by melting of a metasomatized mantle source, with phlogopite breakdown playing a significant role in the geochemical fingerprints of the parental magmas; small amounts of residual garnet in the mantle source also help to explain some trace element patterns. Geochemical features of Dehsalm porphyries and its association with Cu-Mo mineralization agree with a mature continental arc setting related to the convergence of Afghan and Lut plates during Oligocene. © 2013 The Author(s). URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84893768214&doi=10.1007%2fs00531-013-0959-4&partnerID=40&md5=ac9cd704ebc2225bf7427b23433d124d
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/70347
Appears in Collections: 影响、适应和脆弱性 气候减缓与适应
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作者单位: Department of Geology, Payame Noor University, P.O. Box No. 19395-3697, Tehran, Iran; Geobiotec Research Unit, Department of Geosciences, University of Aveiro, 3810-193 Aveiro, Portugal
Recommended Citation:
Arjmandzadeh R.,Santos J.F.. Sr-Nd isotope geochemistry and tectonomagmatic setting of the Dehsalm Cu-Mo porphyry mineralizing intrusives from Lut Block, eastern Iran[J]. International Journal of Earth Sciences,2014-01-01,103(1)