WHOLE-ROCK GEOCHEMISTRY AND MINERAL CHEMISTRY OF THE LATE CRETACEOUS DACITES IN SW SABZEVAR: CONSTRAIN ON THEIR ORIGIN AND TECTONIC SETTING

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GHASEMI HABIBOLLAH; KAZEMI ZAKIE; MOUSIVAND FARDIN; GRIFFIN WILLIAM

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Journal: PETROLOGY Year:2018 | Volume:9 | Issue:35 Page(s): 79-100

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Title

WHOLE-ROCK GEOCHEMISTRY AND MINERAL CHEMISTRY OF THE LATE CRETACEOUS DACITES IN SW SABZEVAR: CONSTRAIN ON THEIR ORIGIN AND TECTONIC SETTING

Author(s)

GHASEMI HABIBOLLAH | KAZEMI ZAKIE | MOUSIVAND FARDIN | GRIFFIN WILLIAM | Issue Writer Certificate

Keywords

MINERAL CHEMISTRYQ1

DACITEQ2

LATE CRETACEOUSQ2

NEO-TETHYSQ2

SABZEVARQ2

Abstract

A thick sequence of Upper Cretaceous volcano-sedimentary rocks are cropped out on the northern edge of Central Iran, southwest of SABZEVAR. The volcanic rocks are DACITE/rhyolite and are associated with pyroclastic rocks, including agglomerate, breccia and tuff. DACITEs are the thickest felsic volcanic unit. They show felsitic porphyry, glomero-porphyry and microlitic-porphyry textures and are composed of clinopyroxene, plagioclase and quartz. Plagioclases show sieve and zoning textures. Whole-rock and clinopyroxene chemistry reveal the tholeiitic nature of these rocks. Primitive mantle-normalized spider diagrams of the investigated rocks show negative anomalies of Nb, Ti and positive anomalies of Pb and K, which are characteristic features of the subduction environment magmas. Plot of the samples on different tectonic setting discrimination diagrams indicates their close relationship to island arc subduction environments. The results of the clinopyroxene chemistry also indicate their augitic composition. Application of geothermobarometry diagrams show temperature ranges between 850oC to 950oC and pressures less than 5 kb for crystallization of these rocks. The results of the present study show that the tholeiitic magma that formed the rocks studied has been generated by partial melting of a spinel lherzolitic mantle source in an island arc subduction zone during the closure of the SABZEVAR Neo-Tethyan oceanic basin in the LATE CRETACEOUS.

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APA: Copy

GHASEMI, HABIBOLLAH, KAZEMI, ZAKIE, MOUSIVAND, FARDIN, & GRIFFIN, WILLIAM. (2018). WHOLE-ROCK GEOCHEMISTRY AND MINERAL CHEMISTRY OF THE LATE CRETACEOUS DACITES IN SW SABZEVAR: CONSTRAIN ON THEIR ORIGIN AND TECTONIC SETTING. PETROLOGY, 9(35 ), 79-100. SID. https://sid.ir/paper/197021/en

Vancouver: Copy

GHASEMI HABIBOLLAH, KAZEMI ZAKIE, MOUSIVAND FARDIN, GRIFFIN WILLIAM. WHOLE-ROCK GEOCHEMISTRY AND MINERAL CHEMISTRY OF THE LATE CRETACEOUS DACITES IN SW SABZEVAR: CONSTRAIN ON THEIR ORIGIN AND TECTONIC SETTING. PETROLOGY[Internet]. 2018;9(35 ):79-100. Available from: https://sid.ir/paper/197021/en

IEEE: Copy

HABIBOLLAH GHASEMI, ZAKIE KAZEMI, FARDIN MOUSIVAND, and WILLIAM GRIFFIN, “WHOLE-ROCK GEOCHEMISTRY AND MINERAL CHEMISTRY OF THE LATE CRETACEOUS DACITES IN SW SABZEVAR: CONSTRAIN ON THEIR ORIGIN AND TECTONIC SETTING,” PETROLOGY, vol. 9, no. 35 , pp. 79–100, 2018, [Online]. Available: https://sid.ir/paper/197021/en

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