PETROLOGY, GEOCHEMISTRY AND RADIOMETRIC AGES OF HIGH SILICA ADAKITIC DOMES OF NEOGENE CONTINENTAL ARC, SOUTH OF QUCHAN

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GHASEMI HABIB ELAH; SADEGHIAN M.; KHAN ALIZADEH A.R.; TANHA ALI

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Journal: Iranian Journal of Crystallography and Mineralogy Year:2010 | Volume:18 | Issue:3 Page(s): 0-0

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Title

PETROLOGY, GEOCHEMISTRY AND RADIOMETRIC AGES OF HIGH SILICA ADAKITIC DOMES OF NEOGENE CONTINENTAL ARC, SOUTH OF QUCHAN

Author(s)

GHASEMI HABIB ELAH | SADEGHIAN M. | KHAN ALIZADEH A.R. | TANHA ALI | Issue Writer Certificate

Keywords

PETROLOGYQ2

GEOCHEMISTRYQ2

CONTINENTAL ARCQ2

ADAKITEQ2

QUCHANQ1

Abstract

Neogene high silica adakitic domes of South of QUCHAN, have been outcropped in the northern part of the QUCHAN-Esfarayen Cenozoic magmatic arc (in the north of the Sabzevar ophiolitic and metamorphic belt). In this volcanic belt, magmatic activities has been started since Eocene (about 40 Ma ago) and continued to Plio-pleistocene (about 2 Ma ago). The ages of volcanic rocks range from Eocene to Plio-pleistocene from south (in adjacent to the Sabzevar ophiolitic belt) to north (in south of QUCHAN) respectively. Neogene northern part of this high silica adakitic arc composed of pyroclastic units and several domes contain trachyandesites, trachytes, dacites and rhyodacites (2-12 Ma ago) which usually overlain an olivine basaltic- basaltic basement of Eocene to lower Miocene(19-20 Ma ago). Existence of Eocene volcanic enclaves and gneissic, siltstonic, marlly and pellitic enclaves, appearance and disappearance of some mineral phases, corrosions and chemical disequilibriums of some phenocrysts and sieve textures are some evidences of magmatic contamination. 87Sr/86Sr ratios range from 0.7041 to 0.7057 confirms this contamination. A clear positive anomaly in LREE and LILE and a negative anomaly in HREE found in the rocks of Neogene domes. Negative anomalies in HFSE (e.g. P, Nb, Ti) which is the indicator of arc settings, also found in these rocks. Calc-alkaline nature, CONTINENTAL ARC subduction setting, presence of an eclogitic or garnet-amphibolitic source rock (resulted from metamorphism of Sabzevar subducted oceanic crust as a source of magma generation), high silica adakitic nature of magmatism (HAS) and the role of fractional crystallization, assimilation and magmatic contamination in the genesis and evolution of magma in these domes, indicated by the geochemical evidences. These adakitic magmas were the latest melts resulted from partial melting of young and hot Sabzevar Neotethyan subducted oceanic crust and its overlaying mantle wedge, which have been emplaced and manifested in the form of subvolcanic adakitic domes.

Cites

NEYSHABOUR TURQUOISE MINE: THE FIRST IRON OXIDE CU-AU-U-LREE (IOCG) MINERALIZED SYSTEM IN IRAN

References

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APA: Copy

GHASEMI, HABIB ELAH, SADEGHIAN, M., KHAN ALIZADEH, A.R., & TANHA, ALI. (2010). PETROLOGY, GEOCHEMISTRY AND RADIOMETRIC AGES OF HIGH SILICA ADAKITIC DOMES OF NEOGENE CONTINENTAL ARC, SOUTH OF QUCHAN. IRANIAN JOURNAL OF CRYSTALLOGRAPHY AND MINERALOGY, 18(3), 0-0. SID. https://sid.ir/paper/356841/en

Vancouver: Copy

GHASEMI HABIB ELAH, SADEGHIAN M., KHAN ALIZADEH A.R., TANHA ALI. PETROLOGY, GEOCHEMISTRY AND RADIOMETRIC AGES OF HIGH SILICA ADAKITIC DOMES OF NEOGENE CONTINENTAL ARC, SOUTH OF QUCHAN. IRANIAN JOURNAL OF CRYSTALLOGRAPHY AND MINERALOGY[Internet]. 2010;18(3):0-0. Available from: https://sid.ir/paper/356841/en

IEEE: Copy

HABIB ELAH GHASEMI, M. SADEGHIAN, A.R. KHAN ALIZADEH, and ALI TANHA, “PETROLOGY, GEOCHEMISTRY AND RADIOMETRIC AGES OF HIGH SILICA ADAKITIC DOMES OF NEOGENE CONTINENTAL ARC, SOUTH OF QUCHAN,” IRANIAN JOURNAL OF CRYSTALLOGRAPHY AND MINERALOGY, vol. 18, no. 3, pp. 0–0, 2010, [Online]. Available: https://sid.ir/paper/356841/en

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