DOI: 10.1007/s00531-015-1200-4
Scopus记录号: 2-s2.0-84930607906
论文题名: Mineralogy, geochemistry, and evolution of the Mivehrood skarn and the associated pluton, northwest Iran
作者: Alirezaei S. ; Einali M. ; Jones P. ; Hassanpour S. ; Arjmandzadeh R.
刊名: International Journal of Earth Sciences
ISSN: 14373254
出版年: 2016
卷: 105, 期: 3 起始页码: 849
结束页码: 868
语种: 英语
英文关键词: Adakite
; F-bearing garnet
; Iran
; Mineral chemistry
; Mivehrood skarn
; Sulfur isotope
Scopus关键词: adakite
; garnet
; igneous geochemistry
; magma chemistry
; pluton
; skarn
; sulfur isotope
; tectonic evolution
; tectonic setting
; Iran
英文摘要: An Upper Miocene (9.12 ± 0.19 Ma; biotite 40Ar/39Ar) shallow pluton and numerous dykes and sills of felsic–intermediate compositions intruded the Upper Cretaceous, flysch-type sediments in the Mivehrood area, northwest Iran. The intrusions caused extensive thermal metamorphism and metasomatism, leading to the formation of hornfels and skarn. A massive skarn, 1–10 m thick, immediate to the intrusive contact, is bordered by a banded skarn, 100–400 m thick, that grades outward into hornfels and original sediments. The Mivehrood pluton is characterized by steep REE pattern, high Al2O3 (14.64–16.4 wt%) and Sr (380–786 ppm), and low MgO (1.3–3.4 wt%), Y (4.8–10.7 ppm), and Yb (0.35–0.95 ppm), characteristics typical of high-silica adakites. Skarn formation started with thermal metamorphism, followed by anhydrous prograde and hydrous retrograde stages. Prograde and retrograde mineral assemblages are developed in both skarns, represented by garnet–clinopyroxene–wollastonite and epidote–actinolite–scapolite–chlorite, respectively. Granditic F-bearing garnet dominates clinopyroxene in both skarns. The banded skarn contains minor scapolite of marialite composition. The calc-silicate mineral assemblages and the mineral chemistry allow the Mivehrood skarn to be classified as a calcic, oxidized skarn. Mass balance assessments suggest that Fe, Si, and S were significantly enriched, and Na, LILEs, and LREEs were strongly depleted, in the massive skarn. In the banded skarn, Na, K, Si, and S were enriched. Significant dehydration and carbon degassing occurred in both skarns. Stockworks, veins, and replacement bodies of pyrite ± chalcopyrite locally occur in the pluton and the dykes and in the skarns. The δ34SCDT values for the sulfides fall in a narrow range around 0.0 ‰, suggesting a magmatic source for sulfur and possibly the hydrothermal water and solutes involved in the skarn formation. © 2015, Springer-Verlag Berlin Heidelberg. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84930607906&doi=10.1007%2fs00531-015-1200-4&partnerID=40&md5=5e2031eebb1fc24481b462506bb09462
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/70167
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: Shahid Beheshti University, P.O. Box: 15875-4731, Tehran, Iran; Ottawa-Carleton Geosciences Centre, University of Carleton, Ottawa, Canada; Department of Geology, Payame Noor University, Karaj, Iran; Department of Geology, Payame Noor University, Tehran, Iran
Recommended Citation:
Alirezaei S.,Einali M.,Jones P.,et al. Mineralogy, geochemistry, and evolution of the Mivehrood skarn and the associated pluton, northwest Iran[J]. International Journal of Earth Sciences,2016-01-01,105(3)