The Study of geochemical behavior of major and rare earth elements of garnet in the Darreh Vali pegmatites (North-east Boroujerd, Sanandaj-Sirjan zone)

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RAHMANI SOMAYEH; TAHMASBI ZAHRA; Ding Xin; Ahmadi Khalagi Ahmadi Khalagi

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Journal: Iranian Journal of Geology Year:2018 | Volume:12 | Issue:47 Page(s): 87-106

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Title

The Study of geochemical behavior of major and rare earth elements of garnet in the Darreh Vali pegmatites (North-east Boroujerd, Sanandaj-Sirjan zone)

Author(s)

RAHMANI SOMAYEH | TAHMASBI ZAHRA | Ding Xin | Ahmadi Khalagi Ahmadi Khalagi | Issue Writer Certificate

Keywords

BoroujerdQ2

PegmatoteQ1

Darreh ValiQ1

GeochemistryQ2

Rare earth elementsQ2

Magmatic garnetQ2

Abstract

The pegmatites of Darreh Vali region is located in the north-east of Boroujerd which is a part of Sanandaj-Sirjan zone. In the Darreh Vali area, granodiorite bodies are cut by small pegmatitic dykes with NW– SE trend. The mineralogy of studied pegmatites consists of quartz, alkali-feldspar (orthoclase and microcline), plagioclase, muscovite, garnet (almandine-spessartin), andalusite, tourmaline, and apatite. Chondrite-normalized patterns of the Darreh Vali pegmatite are characterized by low enrichments of LREE relative to HREE (LaN/YbN=1. 76-4. 04), with a relatively flat HREE distribution, and a strong negative Eu anomaly (Eu/Eu* =0. 20-0. 54). Major element chemistry of garnets in these pegmatites indicates a compositional zoning with decreasing MnO and increasing FeO from core towards the rim. In the case of the Darreh Vali pegmatites, all garnet crystals contain low CaO (0. 15 to 0. 29 wt. %) and high MnO (10. 27 to 13. 18 wt. %), which are similar to Magmatic garnets from pegmatitic melts. On the MnO+CaO versus FeO+MgO (in wt. %) diagram, the composition of garnets shows that they probably crystallised in contact zones of pegmatite vein and from less evolved melts. LA-ICP-MS analyses show that analysed garnets have a high HREE, low LREE contents, and strong negative Eu anomaly (Eu/Eu*=0-0. 41) in the core along with positive Eu anomaly (Eu/Eu*=0-3. 22) at the rim. Y, HREE, Ti, Zr, Nb, Ta, Hf, U and Mn decrease from core to rim. These core-to-rim elemental variations are attributed to increasing fluid-phase and H2O activity in magma, along with increasing magma fractionation. REE patterns and Eu anomalies in zoned garnets suggest that they probably formed in reducing to oxidizing conditions.

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APA: Copy

RAHMANI, SOMAYEH, TAHMASBI, ZAHRA, Ding, Xin, & Ahmadi Khalagi, Ahmadi Khalagi. (2018). The Study of geochemical behavior of major and rare earth elements of garnet in the Darreh Vali pegmatites (North-east Boroujerd, Sanandaj-Sirjan zone). IRANIAN JOURNAL OF GEOLOGY, 12(47 ), 87-106. SID. https://sid.ir/paper/129493/en

Vancouver: Copy

RAHMANI SOMAYEH, TAHMASBI ZAHRA, Ding Xin, Ahmadi Khalagi Ahmadi Khalagi. The Study of geochemical behavior of major and rare earth elements of garnet in the Darreh Vali pegmatites (North-east Boroujerd, Sanandaj-Sirjan zone). IRANIAN JOURNAL OF GEOLOGY[Internet]. 2018;12(47 ):87-106. Available from: https://sid.ir/paper/129493/en

IEEE: Copy

SOMAYEH RAHMANI, ZAHRA TAHMASBI, Xin Ding, and Ahmadi Khalagi Ahmadi Khalagi, “The Study of geochemical behavior of major and rare earth elements of garnet in the Darreh Vali pegmatites (North-east Boroujerd, Sanandaj-Sirjan zone),” IRANIAN JOURNAL OF GEOLOGY, vol. 12, no. 47 , pp. 87–106, 2018, [Online]. Available: https://sid.ir/paper/129493/en

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