Rare earth element (REE) partitioning in amphibole-bearing medium grade metamorphic rocks from the Alvand Complex (Sanandaj-Sirjan Zone, NW Iran)

被引:2
作者
Miri, Mirmohammad [1 ]
Sepahi, Ali. A. [2 ,3 ]
Maanijou, Mohammad [2 ]
Lucci, Federico [4 ]
机构
[1] Shahid Chamran Univ Ahvaz, Fac Earth Sci, Geol Dept, Ahvaz, Iran
[2] Bu Ali Sina Univ, Dept Geol, Hamadan 6516738695, Iran
[3] Ferdowsi Univ Mashshad, Fac Sci, Dept Geol, Mashhad, Iran
[4] Univ Bari, Dept Earth & Geoenvironm Sci, Bari, Italy
来源
PERIODICO DI MINERALOGIA | 2024年 / 93卷 / 01期
关键词
Rare-earth elements; Para-amphibolite; REE partitioning; Alvand plutonic complex; Sanandaj-Sirjan Zone; Iran; LOW-PRESSURE MIGMATITES; WESTERN IRAN; NORTHERN GONDWANA; INTRUSIVE COMPLEX; CALCIC AMPHIBOLES; HAMEDAN REGION; ZAGROS OROGEN; T PATH; GEOCHEMISTRY; BELT;
D O I
10.13133/2239-1002/18284
中图分类号
P3 [地球物理学]; P59 [地球化学];
学科分类号
0708 ; 070902 ;
摘要
In this work we explore the distribution of rare earth elements (REE) in hornblendebearing metamorphic rocks from the Jurassic Alvand plutonic complex (Sanandaj-Sirjan Zone, NW Iran) focusing on the understanding the effect of rock -forming silicates in controlling compositional variations during metamorphism. The studied rocks contain two distinct amphibole -dominated paragenesis: a first one including hornblende + epidote + plagioclase ("amphibolite") and a second on made up of hornblende + garnet + epidote + plagioclase ("garnet amphibolite"). The bulk high Al 2 O 3 (average 17.7 wt%), CaO (average 11.9 wt%) and low Fe 2 O 3 * (average 5.9 wt%), MgO (average 2.3 wt%), and TiO 2 (average 0.8 wt%) contents together with the Zr/Ti (average 280), Na 2 O/ Al 2 O 3 (average 0.05) and Na 2 O+K 2 O (average 1.7 wt%) values indicate these rocks are para-amphibolite formed by metamorphism of a marl (calcareous shale) protolith. With respect to the rock -forming phases, the epidotes have the highest Sigma REE contents (Sigma REE=86-210 ppm). The garnets (Sigma REE=27-87 ppm) and hornblendes (Sigma REE=10-22 ppm) have moderate values, whereas the plagioclase shows the lowest REE (2-4.7 ppm) amounts. Inverse and forward modelling thermobarometry was applied to unravel the pressure -temperature history of the studied samples and therefore to reveal the impact of each phase on the REE partitioning during the recorded metamorphic evolution, considering that REE are mostly immobile during crust processes and therefore their bulk budget is that of the protolith.
引用
收藏
页码:11 / 33
页数:24
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