THE OLIGOCENE BASALTIC LAVAS OF EAST AND SOUTHEAST OF SHAHROUD: IMPLICATION FOR BACK-ARC BASIN SETTING OF CENTRAL IRAN OLIGO-MIOCENE BASIN

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GHASEMI HABIB ALLAH; BARAHMAND MOHAMMAD; SADEGHIAN MAHMOUD

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Journal: PETROLOGY Year:2011 | Volume:2 | Issue:7 Page(s): 77-94

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Information Journal Paper

Title

THE OLIGOCENE BASALTIC LAVAS OF EAST AND SOUTHEAST OF SHAHROUD: IMPLICATION FOR BACK-ARC BASIN SETTING OF CENTRAL IRAN OLIGO-MIOCENE BASIN

Author(s)

GHASEMI HABIB ALLAH | BARAHMAND MOHAMMAD | SADEGHIAN MAHMOUD | Issue Writer Certificate

Keywords

BASALTQ2

MAGMATISMQ2

BACK-ARC BASINQ2

OLIGOCENE-MIOCENEQ3

CENTRAL IRANQ1

SHAHROUDQ3

Abstract

Some BASALTic lava, with olivine BASALT to BASALTic composition, have been erupted within the Oligocene gypsiferous red marls (Lower Red Formation), in east and southeast of SHAHROUD. These rocks display microlitic porphyry, glomeroporphyry and hyaloporphyry textures. Olivine, plagioclase and pyroxene (in olivine BASALTs) and plagioclase and pyroxene (in BASALTs) are the main minerals. Enrichment in LREE and LILE and depletion in HREE, with positive anomalies in Pb, Sr and Cs, and the absence of negative anomalies in Eu and HFSE, indicate an alkaline nature and a sub lithospheric enriched mantle source for these rocks. The rocks studied plot in BACK-ARC BASIN realm in petro genetic and tectonomagmatic diagrams and seem to be generated from about 10% partial melting of an enriched garnet-lherzolitic mantle source. This tectonic setting, implies an extensional proto-back-arc basin in Oligo-Miocene, behind the Uroumiyeh-Dokhtar magmatic arc, in some parts of CENTRAL IRAN, that had been accompanied by the deposition of continental sediments (Lower Red Formation), shallow sea deposits (Qom Formation) followed by continental sediments (Upper Red Formation) and basic alkaline mantle MAGMATISM.

Cites

PETROLOGY AND GEOCHEMISTRY OF IGNEOUS ROCKS IN THE LOWER RED FORMATION, GARMSAR AREA

References

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APA: Copy

GHASEMI, HABIB ALLAH, BARAHMAND, MOHAMMAD, & SADEGHIAN, MAHMOUD. (2011). THE OLIGOCENE BASALTIC LAVAS OF EAST AND SOUTHEAST OF SHAHROUD: IMPLICATION FOR BACK-ARC BASIN SETTING OF CENTRAL IRAN OLIGO-MIOCENE BASIN. PETROLOGY, 2(7), 77-94. SID. https://sid.ir/paper/196992/en

Vancouver: Copy

GHASEMI HABIB ALLAH, BARAHMAND MOHAMMAD, SADEGHIAN MAHMOUD. THE OLIGOCENE BASALTIC LAVAS OF EAST AND SOUTHEAST OF SHAHROUD: IMPLICATION FOR BACK-ARC BASIN SETTING OF CENTRAL IRAN OLIGO-MIOCENE BASIN. PETROLOGY[Internet]. 2011;2(7):77-94. Available from: https://sid.ir/paper/196992/en

IEEE: Copy

HABIB ALLAH GHASEMI, MOHAMMAD BARAHMAND, and MAHMOUD SADEGHIAN, “THE OLIGOCENE BASALTIC LAVAS OF EAST AND SOUTHEAST OF SHAHROUD: IMPLICATION FOR BACK-ARC BASIN SETTING OF CENTRAL IRAN OLIGO-MIOCENE BASIN,” PETROLOGY, vol. 2, no. 7, pp. 77–94, 2011, [Online]. Available: https://sid.ir/paper/196992/en

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