GEOCHEMISTRY AND TECTONIC SETTING OF HIGH SILICA ADAKITIC DOMES OF AHMAD ABAD KHARTOURAN (SOUTH EAST OF SHAHROOD)

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YOUSEFI F.; SADEGHIAN M.; SAMYARI S.; GHASEMI H.

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Journal: GEOSCIENCES Year:2016 | Volume:25 | Issue:100 Page(s): 291-298

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Title

GEOCHEMISTRY AND TECTONIC SETTING OF HIGH SILICA ADAKITIC DOMES OF AHMAD ABAD KHARTOURAN (SOUTH EAST OF SHAHROOD)

Author(s)

YOUSEFI F. | SADEGHIAN M. | SAMYARI S. | GHASEMI H. | Issue Writer Certificate

Keywords

ADAKITEQ2

DOMEQ1

CRUSTAL CONTAMINATIONQ2

MAGMA MIXINGQ2

NEOTETHYS OCEANIC SLABQ1

AHMADABADQ2

KHARTOURANQ1

SHAHROODQ1

Abstract

In the AHMADABAD KHARTOURAN region located at 175 Km southeast of SHAHROOD, a considerable number of adakitic DOMEs crop out, which are intruded into the Paleocene- Eocene volcano sedimentary rocks. Lithological compositions of these DOMEs include andesite, trachyandesite and dacite. Pyroxene (augite), green hornblende and plagioclase are typical mafic and felsic rock forming minerals. With respect to low HREE and high LREE along with other characteristic such as silica content (58.91-63.41), Na2O more than 3%, Al2O3 more than16%, Yb less than 1.8 ppm, Y less than 18 ppm and K2O/Na2O ratio between 0.98- 2.3, these rocks can be classified as high silica ADAKITE. Enrichment of LREE relative to the HREE and depletion of Nb, Ti, and high concentration of Rb, Ba, K and Th, imply CRUSTAL CONTAMINATION of the mentioned adakitic DOMEs. Enclaves with different sizes and compositions were seen in these DOMEs which indicate contamination and MAGMA MIXING with continental crust. Petrographic and geochemical evidence show that the magma forming these rocks originated from melting of subducted metamorphosed NEOTETHYS OCEANIC SLAB (Sabzevar – Darouneh branch) at the Peak-T conditions of amphibolite facies.

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APA: Copy

YOUSEFI, F., SADEGHIAN, M., SAMYARI, S., & GHASEMI, H.. (2016). GEOCHEMISTRY AND TECTONIC SETTING OF HIGH SILICA ADAKITIC DOMES OF AHMAD ABAD KHARTOURAN (SOUTH EAST OF SHAHROOD). GEOSCIENCES, 25(100), 291-298. SID. https://sid.ir/paper/31703/en

Vancouver: Copy

YOUSEFI F., SADEGHIAN M., SAMYARI S., GHASEMI H.. GEOCHEMISTRY AND TECTONIC SETTING OF HIGH SILICA ADAKITIC DOMES OF AHMAD ABAD KHARTOURAN (SOUTH EAST OF SHAHROOD). GEOSCIENCES[Internet]. 2016;25(100):291-298. Available from: https://sid.ir/paper/31703/en

IEEE: Copy

F. YOUSEFI, M. SADEGHIAN, S. SAMYARI, and H. GHASEMI, “GEOCHEMISTRY AND TECTONIC SETTING OF HIGH SILICA ADAKITIC DOMES OF AHMAD ABAD KHARTOURAN (SOUTH EAST OF SHAHROOD),” GEOSCIENCES, vol. 25, no. 100, pp. 291–298, 2016, [Online]. Available: https://sid.ir/paper/31703/en

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