Utilize este identificador para referenciar este registo:
http://hdl.handle.net/10773/28837
Título: | U-Pb geochronology, Sr–Nd isotopic compositions, geochemistry and petrogenesis of Shah Soltan Ali granitoids, Birjand, Eastern Iran |
Autor: | Nadermezerji, S. Karimpour, M. H. Malekzadeh Shafaroudi, A. Santos, José Francisco Mathur, R. Ribeiro, Sara Monteiro |
Palavras-chave: | Granitoids U–Pb geochronology Subduction Mantle wedge Shah Soltan Ali Lut Block |
Data: | 3-Set-2018 |
Editora: | Elsevier |
Resumo: | The Shah Soltan Ali area (SSA) is located in the eastern part of the Lut Block metallogenic province. In this area different types of sub-volcanic intrusions including diorite porphyry, monzonite porphyry and monzodiorite porphyry have intruded into basaltic and andesitic rocks. Zircon U–Pb dating and field observations indicate that intermediate to mafic volcanic rocks (38.9 Ma) are older than subvolcanic units (38.3 Ma). The subvolcanic intrusions show high-K calc-alkaline to shoshonitic affinity and are metaluminous. Based on mineralogy, high values of magnetic susceptibility [(634 to 3208) × 10−5 SI], and low initial 87Sr/86Sr ratios, they are classified as belonging to the magnetite-series of oxidant I-type granitoids and are characterized by an enrichment in LREEs relative to HREEs, with negative Nb, Ti, Zr and Eu anomalies. These granitoids are related to volcanic arc (VAG) and were generated in an active continental margin. Low initial 87Sr/86Sr ratios (0.7043 to 0.7052) and positive εNd values (+1.48 to +3.82) indicate that the parental magma was derived from mantle wedge. Parental magma was probably formed by low degree of partial melting and metasomatized by slab derived fluids. Then assimilation and fractional crystallization processes (AFC) produced the SSA rocks. This magma during the ascent was contaminated with the crustal material. All data suggest that Middle-Late Eocene epoch magmatism in the SSA area, occurred during subduction of Neo-Tethys Ocean in east of Iran (between Afghan and Lut Blocks). |
Peer review: | yes |
URI: | http://hdl.handle.net/10773/28837 |
DOI: | 10.1016/j.chemer.2018.08.003 |
ISSN: | 0009-2819 |
Versão do Editor: | https://doi.org/10.1016/j.chemer.2018.08.003 |
Aparece nas coleções: | DGeo - Artigos GeoBioTec - Artigos |
Ficheiros deste registo:
Ficheiro | Descrição | Tamanho | Formato | |
---|---|---|---|---|
Nadermezerjietal2018.pdf | 5.27 MB | Adobe PDF |
Todos os registos no repositório estão protegidos por leis de copyright, com todos os direitos reservados.