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A., Zarasvandi, Rezaei, M., Lentz, D., H., Pourkaseb, Karevani, M.. (1394). The Kasian volcanic rocks, Khorramabad, Iran: Evidence for a Jurassic Intra-Oceanic island arc in Neo-Tethys ocean. , 39(2), 165-178. doi: 10.22099/ijsts.2015.3013
Zarasvandi A.; M. Rezaei; D. Lentz; Pourkaseb H.; M. Karevani. "The Kasian volcanic rocks, Khorramabad, Iran: Evidence for a Jurassic Intra-Oceanic island arc in Neo-Tethys ocean". , 39, 2, 1394, 165-178. doi: 10.22099/ijsts.2015.3013
A., Zarasvandi, Rezaei, M., Lentz, D., H., Pourkaseb, Karevani, M.. (1394). 'The Kasian volcanic rocks, Khorramabad, Iran: Evidence for a Jurassic Intra-Oceanic island arc in Neo-Tethys ocean', , 39(2), pp. 165-178. doi: 10.22099/ijsts.2015.3013
A., Zarasvandi, Rezaei, M., Lentz, D., H., Pourkaseb, Karevani, M.. The Kasian volcanic rocks, Khorramabad, Iran: Evidence for a Jurassic Intra-Oceanic island arc in Neo-Tethys ocean. , 1394; 39(2): 165-178. doi: 10.22099/ijsts.2015.3013

The Kasian volcanic rocks, Khorramabad, Iran: Evidence for a Jurassic Intra-Oceanic island arc in Neo-Tethys ocean

Iranian Journal of Science
مقاله 6، دوره 39، شماره 2، شهریور 2015، صفحه 165-178    اصل مقاله (769.54 K)
نوع مقاله: Regular Paper
شناسه دیجیتال (DOI): 10.22099/ijsts.2015.3013
نویسندگان
Zarasvandi A.1؛ M. Rezaei* 1؛ D. Lentz2؛ Pourkaseb H.1؛ M. Karevani2
1Department of Geology, Faculty of Earth Science, Shahid Chamran University (SCU), Ahvaz, Iran
2Department of Earth Sciences, University of New Brunswick, New Brunswick, Canada
چکیده
 
The Kasian volcanic body is located in the eastern margin of the Zagros thrust belt, close to the Sanandaj-Sirjan metamorphic zone. These volcanic rocks are mainly composed of andesite and andesite-basalt rocks with porphyritic, hypocrystalline porphyritic, hyalo-porphyritic and hyalo-microlitic porphyritic textures. Analyses of the distributions of major, rare earth and trace elements reveal a tholeiitic nature and evidence such as enrichment of Pb and LILE (e.g., U, Rb, Ba), depletion in HFSE (e.g., Nb, Ti, Y), slight enrichment of LREE relative to HREE and trace elements discrimination plots reveal island arc affinity for the Kasian volcanic rocks. Some characteristics like, low Nd/Pb and Ce/Pb values (average 8.76 and 12.70, respectively), high U values and low Nb/U ratios (average 3.52) indicate enrichment of mantle wedge by contribution of slab-derived fluids during dehydration of subducting slab of Neo-Tethys oceanic lithosphere. Moreover, the results show these volcanic rocks to have fractionated as they ascended to higher crustal levels. The results of this study are consistent with the new tectonic scenario for the Sanandaj-Sirjan zone, which suggests that during ocean–ocean subduction (from Jurassic to Cretaceous) an immature island arc developed before the closure of Neo-Tethys ocean.
کلیدواژه‌ها
Geochemistry؛ Zagros orogeny؛ Kasian؛ Intra oceanic island arc؛ Iran
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