Original paper
Geochemistry and Zircon-Allanite U-Pb Geochronology of Aplites-Pegmatites in the Qorveh Region, Sanandaj-Sirjan Zone, Iran
Sepahi, Ali A.; Salami, Sedigheh; Maanijou, Mohammad; Lentz, David R.; McFarlane, Chris R. M.; Vahidpour, Hamed
Neues Jahrbuch für Mineralogie - Abhandlungen Band 198 Heft 1 (2022), p. 45 - 61
65 references
published: Sep 20, 2022
published online: May 17, 2022
manuscript accepted: Apr 13, 2022
final revised version received: Apr 12, 2022
manuscript revision requested: Mar 23, 2022
manuscript received: Nov 19, 2021
ArtNo. ESP154019801002, Price: 29.00 €
Abstract
The aplites-pegmatites in the Qorveh region, NW Sanandaj-Sirjan zone, Zagros orogen, Iran, appear as dikes intruding various lithologies, such as granite, gabbro, diorite, and marble. These dikes have mostly granitic compositions, and their alumina saturation index (ASI) varies from metaluminous to peraluminous. Comparatively high amounts of incompatible trace elements, such as Nb (up to 109 ppm), Ba and Rb (up to 586 ppm), indicate an evolved composition of these dikes. The zircon U-Pb ages for an aplite sample from the Kangareh area are concordant, but scatter from c. 162 to 132 Ma, whereas allanite yields a 151.0 ± 4.3 Ma age (Mean Square of Weighted Deviates, MSWD = 1.4). Allanite of an aplitic dike from the Mayham area gave a U-Pb age of 150.3 ± 4.3 Ma (MSWD = 1.2). The ages obtained for aplite dikes indicate approximately the same ages as previously reported ages (140–160 Ma) for plutonic rocks of the region; therefore, Late Jurassic magmatic (plutonic) activities possibly in a continental arc setting could be an important feature in the region.
Keywords
aplite • pegmatite • geochemistry • geochronology • Qorveh • Sanandaj-Sirjan