The investigation of O-H and B stable isotopes in tourmalines of Mashhad biotite-muscovite granite

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zall f.; TAHMASBI Z.; AHMADI KHALAJI A.; jiang sh.y.; danyushevsky l.; harris ch.

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Journal: GEOSCIENCES Year:2019 | Volume:28 | Issue:112 Page(s): 81-90

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Title

The investigation of O-H and B stable isotopes in tourmalines of Mashhad biotite-muscovite granite

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Keywords

Boron IsotopeQ1

Oxygen IsotopeQ2

Hydrogen IsotopeQ1

TourmalineQ2

Mashhad GraniteQ2

Abstract

Several distinct morphologies of Tourmaline have been identified in Mashhad biotite-muscovite granite: nodule, pegmatite, aplite, quartzTourmaline veins, Tourmaline-rich veins and radial Tourmalines. The δ 18O and δ D values in solar Tourmaline (12. 4 and-69 ‰ ), nodule Tourmaline (11. 8 and-63), quartz-Tourmaline vein (11. 7 and-57), pegmatite Tourmaline (11. 62-11. 67 and-59 to-73), aplite Tourmaline (11. 39 and-57), Tourmaline-rich vein (11. 82 and-62) and mica schist Tourmaline (11. 06 and-77) with low changes are similar together. These values show same origin for Tourmalines fluid source in biotite-muscovite granite. The difference in δ 18O values between quartz and Tourmaline (Δ qtz-tur) are positive (between+2. 0 and+2. 2‰ ), and this show quartz and Tourmaline are in equilibrium. The δ 18O thermometry of Tourmaline-quartz minerals show a range between 492° C and 579 ° C for Tourmaline crystallization. The calculated δ 18O, and δ D values of the initial fluid in equilibrium with Tourmaline suggest a magmatic and primitive magmatic water of peraluminous granite source. All Tourmalines show similar δ 11B values (with a narrow range between − 7. 4 and − 10. 8‰ ). This indicates a same boron source for them that resulting during highly evolved magmatic differentiation. Based on the 11B values of Tourmalines in Mashhad fall within the range reported for granite-related Tourmaline and similar to the S-type source granites that derived by Continental crust. The δ 11B values of Tourmalines show the δ 11B values of the magma of the biotite-muscovite granite.

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APA: Copy

zall, f., TAHMASBI, Z., AHMADI KHALAJI, A., jiang, sh.y., danyushevsky, l., & harris, ch.. (2019). The investigation of O-H and B stable isotopes in tourmalines of Mashhad biotite-muscovite granite. GEOSCIENCES, 28(112 ), 81-90. SID. https://sid.ir/paper/32143/en

Vancouver: Copy

zall f., TAHMASBI Z., AHMADI KHALAJI A., jiang sh.y., danyushevsky l., harris ch.. The investigation of O-H and B stable isotopes in tourmalines of Mashhad biotite-muscovite granite. GEOSCIENCES[Internet]. 2019;28(112 ):81-90. Available from: https://sid.ir/paper/32143/en

IEEE: Copy

f. zall, Z. TAHMASBI, A. AHMADI KHALAJI, sh.y. jiang, l. danyushevsky, and ch. harris, “The investigation of O-H and B stable isotopes in tourmalines of Mashhad biotite-muscovite granite,” GEOSCIENCES, vol. 28, no. 112 , pp. 81–90, 2019, [Online]. Available: https://sid.ir/paper/32143/en

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