TY - JOUR
T1 - Zircon U-Pb geochronology and geochemistry of Late Devonian–Carboniferous granitoids in NW Iran
T2 - implications for the opening of Paleo-Tethys
AU - Mohammadi, Ali
AU - Moazzen, Mohssen
AU - Lechmann, Anna
AU - Laurent, Oscar
N1 - Publisher Copyright:
© 2019 Informa UK Limited, trading as Taylor & Francis Group.
PY - 2020/10/12
Y1 - 2020/10/12
N2 - We present zircon U-Pb crystallization ages combined with bulk rock major and trace element geochemistry and Sr-Nd-Pb and zircon in-situ Hf isotopic compositions of the Amand and Moro granitoid intrusions in northwest Iran. The Amand and Moro plutons include granite and syeno-diorite with LA-ICP-MS U-Pb zircon ages of 367 ± 6.8 Ma and 351 ± 1.3 Ma, respectively, representative of Late Devonian-Early Carboniferous magmatic activity in NW Iran. Geochemical characteristics such as typical enrichments in alkalis, Nb, Zr, Ga and Y, depletion in P and Sr and fractionated REE patterns with high Ga/Al ratios and Eu negative anomalies are consistent with A-type magmatic signatures. The granitoids are classified as A2-type and within-plate granitoids. The bulk rock geochemistry (enrichments in Th, Nb and, high Th/Yb, Zr/Y ratios) along with low variation of 143Nd/144Nd(i) and 87Sr/86Sr(i) ratios and positive zircon εHf(t) support the role of a mantle plume component for the evolution of the Amand and Moro A-type granitoids in an extensional tectonic environment. In fitting with wider regional knowledge, this magmatism occurred during Paleo-Tethys opening in northern Gondwana.
AB - We present zircon U-Pb crystallization ages combined with bulk rock major and trace element geochemistry and Sr-Nd-Pb and zircon in-situ Hf isotopic compositions of the Amand and Moro granitoid intrusions in northwest Iran. The Amand and Moro plutons include granite and syeno-diorite with LA-ICP-MS U-Pb zircon ages of 367 ± 6.8 Ma and 351 ± 1.3 Ma, respectively, representative of Late Devonian-Early Carboniferous magmatic activity in NW Iran. Geochemical characteristics such as typical enrichments in alkalis, Nb, Zr, Ga and Y, depletion in P and Sr and fractionated REE patterns with high Ga/Al ratios and Eu negative anomalies are consistent with A-type magmatic signatures. The granitoids are classified as A2-type and within-plate granitoids. The bulk rock geochemistry (enrichments in Th, Nb and, high Th/Yb, Zr/Y ratios) along with low variation of 143Nd/144Nd(i) and 87Sr/86Sr(i) ratios and positive zircon εHf(t) support the role of a mantle plume component for the evolution of the Amand and Moro A-type granitoids in an extensional tectonic environment. In fitting with wider regional knowledge, this magmatism occurred during Paleo-Tethys opening in northern Gondwana.
KW - Granitoid
KW - Iran
KW - Palaeo-Tethys
KW - rifting
KW - U-Pb geochronology
UR - http://www.scopus.com/inward/record.url?scp=85074370553&partnerID=8YFLogxK
U2 - 10.1080/00206814.2019.1675540
DO - 10.1080/00206814.2019.1675540
M3 - Article
AN - SCOPUS:85074370553
SN - 0020-6814
VL - 62
SP - 1931
EP - 1948
JO - International Geology Review
JF - International Geology Review
IS - 15
ER -
