Petrogenesis of adakitic and calc-alkaline granitoids in Rabor-Lalehzar region, SE of Kerman: Constraints from geochemical and Sr-Nd isotopes results

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Chekani Moghadam m.; TAHMASBI Z.; AHMADI KHALAJI A.

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Journal: GEOSCIENCES Year:2018 | Volume:27 | Issue:108 Page(s): 13-26

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Title

Petrogenesis of adakitic and calc-alkaline granitoids in Rabor-Lalehzar region, SE of Kerman: Constraints from geochemical and Sr-Nd isotopes results

Author(s)

Chekani Moghadam m. | TAHMASBI Z. | AHMADI KHALAJI A. | Issue Writer Certificate

Keywords

Lalehzar granitoidsQ1

Uromieh-Dokhtar zoneQ2

Adakitic rocksQ1

SubductionQ2

Lower crustQ1

Abstract

The study area is located at N to NW of Rabor city in the Kerman province within the Uromieh-Dokhtar Magmatic Belt (UDMB). Most of the rocks in this area include diorite, granodiorite and granite, which are exposed in volcanic sequences and cut them. Based on the geochemical features, all of rocks classify in two groups: (1) some granitoid rocks show adakitic affinity with high SiO2 (61. 49– 66. 78 wt. %), Al2O3 (15. 72– 17. 74 wt. %), Sr (374– 602 ppm), Sr/Y (34– 53), (La/Yb)N (8. 35– 16. 88) and low Y values. (2) another rock group is granitiods with typical calc-alkaline characteristics with distinct features different from adakitic types such as: SiO2 (63. 07– 72. 32 wt. %), lower Sr/Y (3. 8– 13. 2) ratio and higher Y (21. 7– 31. 6 ppm) and Yb (2. 29– 3. 26 ppm) contents, and the lowest Sr (119– 297 ppm) and (La/Yb)N (3. 02– 11. 13) values relative to adakitic groups, with obvious negative Eu [(Eu/Eu*)N= (ave. 0. 49)] anomalies. The Adakitic rocks most probably originated from thickened mafic Lower crust (garnet amphibolite) with garnet+ rutile ± plagioclase as residual minerals in the source, corresponding to depths of >50 km, and calc-alkaline rocks were probably generated at shallow depth than adakitic groups in mid-Lower crust (dominant amphibolite) correlating to depths of <50 km. Study of 143Nd/144Nd (0. 512686– 0. 512776), ε Nd= +1. 44 to +3. 19 and 87Sr/86Sr (0. 705195– 0. 704871) isotopic ratios revealed a mantle lithospheric origin for the granitoid rocks. Positive relationship between SiO2 variations with isotopic ratios shows effect of crust assimilation in evolution of primary magma. Finally, we propose based on the geological, geochemical and isotopic data, that calc-alkaline and adakitic magmatism in the SE of UDMB generated by partial melting of the upper mantle and subsequent mixing with lowermid continental crust due to Subduction of Arabian ocean crust under the Central Iran micro-plate during the Oligocene-Miocene.

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APA: Copy

Chekani Moghadam, m., TAHMASBI, Z., & AHMADI KHALAJI, A.. (2018). Petrogenesis of adakitic and calc-alkaline granitoids in Rabor-Lalehzar region, SE of Kerman: Constraints from geochemical and Sr-Nd isotopes results. GEOSCIENCES, 27(108 ), 13-26. SID. https://sid.ir/paper/32560/en

Vancouver: Copy

Chekani Moghadam m., TAHMASBI Z., AHMADI KHALAJI A.. Petrogenesis of adakitic and calc-alkaline granitoids in Rabor-Lalehzar region, SE of Kerman: Constraints from geochemical and Sr-Nd isotopes results. GEOSCIENCES[Internet]. 2018;27(108 ):13-26. Available from: https://sid.ir/paper/32560/en

IEEE: Copy

m. Chekani Moghadam, Z. TAHMASBI, and A. AHMADI KHALAJI, “Petrogenesis of adakitic and calc-alkaline granitoids in Rabor-Lalehzar region, SE of Kerman: Constraints from geochemical and Sr-Nd isotopes results,” GEOSCIENCES, vol. 27, no. 108 , pp. 13–26, 2018, [Online]. Available: https://sid.ir/paper/32560/en

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