DOI: 10.1007/s00531-013-0884-6
论文题名: Petrology, geochemistry, and geochronology of the Chah-Bazargan gabbroic intrusions in the south Sanandaj-Sirjan zone, Neyriz, Iran
作者: Fazlnia A. ; Schenk V. ; Appel P. ; Alizade A.
刊名: International Journal of Earth Sciences
出版年: 2013
卷: 102, 期: 5 起始页码: 1403
结束页码: 1426
语种: 英语
英文关键词: Anorthosite
; Fractional crystallization
; Gabbroic intrusion
; Subduction zone
; Wehrlite
Scopus关键词: anorthosite
; clinopyroxene
; fractional crystallization
; fractionation
; gabbro
; geochemistry
; geochronology
; igneous intrusion
; magma chamber
; partial melting
; petrology
; spinel
; subduction zone
; uranium-lead dating
; wehrlite
; Fars
; Iran
; Neyriz
; Sanandaj-Sirjan Belt
英文摘要: The Chah-Bazargan gabbroic intrusions are located in the south of Sanandaj-Sirjan zone. Precise U-Pb zircon SHRIMP ages of the intrusions show magmatic ages of 170.5 ± 1.9 Ma. These intrusions consist primarily of gabbros, interspersed with lenticular bodies of anorthosite, troctolite, clinopyroxenite, and wehrlite. The lenticular bodies show gradational or sharp boundaries with the gabbros. In the gradational boundaries, gabbros are mineralogically transformed into anorthosites, wehrlites, and/or clinopyroxenites. On the other hand, where the boundaries are sharp, the mineral assemblages change abruptly. There is no obvious deformation in the intrusions. Hence, the changes in mineral compositions are interpreted as the result of crystallization processes, such as fractionation in the magma chamber. Rock types with sharp boundaries show abrupt chemical changes, but the changes exhibit the same patterns of increasing and decreasing elements, especially of rare earth elements, as the gradational boundaries. Therefore, it is possible that all parts of the intrusions were formed from the same parental magma. Parts showing signs of nonequilibrium crystallization, such as cumulate features and sub-solidification, underwent fracturing and were interspersed throughout the magma chamber by late injection pulses or mechanical movements under mush conditions. The geological and age data show that the intrusions were formed from an Al-, Sr-, Fe-enriched and K-, Nb-depleted tholeiitic magma. The magma resulted from the partial melting of a metasomatized spinel demonstrated by negative Nb, P, Hf, and Ti, and positive Ba, Sr, and U anomalies typical of subduction-related magmas. © 2013 Springer-Verlag Berlin Heidelberg. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84878937345&doi=10.1007%2fs00531-013-0884-6&partnerID=40&md5=989b802092b49e68e34668d6723e2c0a
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/70546
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, University of Urmia, 57153-165 Urmia, Iran; Institute for Geowissenschaften, Universität Kiel, 24098 Kiel, Germany
Recommended Citation:
Fazlnia A.,Schenk V.,Appel P.,et al. Petrology, geochemistry, and geochronology of the Chah-Bazargan gabbroic intrusions in the south Sanandaj-Sirjan zone, Neyriz, Iran[J]. International Journal of Earth Sciences,2013-01-01,102(5)