GEOCHEMISTRY, PETROGENESIS AND TECTONIC SETTING OF THE SARCHESHMEH EOCENE MAFIC LAVA FLOWS, SOUTHWEST OF RAFSANJAN

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HOSSEINI S.Z.

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Journal: GEOSCIENCES Year:2016 | Volume:25 | Issue:100 Page(s): 209-220

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Title

GEOCHEMISTRY, PETROGENESIS AND TECTONIC SETTING OF THE SARCHESHMEH EOCENE MAFIC LAVA FLOWS, SOUTHWEST OF RAFSANJAN

Author(s)

HOSSEINI S.Z. | Issue Writer Certificate

Keywords

SARCHESHMEHQ2

EOCENEQ2

BASALTQ2

ANDESITEQ2

CALC-ALKALINEQ2

ACTIVE CONTINENTAL MARGINQ2

Abstract

The EOCENE mafic lava flows of SARCHESHMEHare cropped out in the southwest of Rafsanjan area at the central part of the Urmia – Dokhtar magmatic belt. The rocks are BASALT, BASALTic ANDESITE and ANDESITE in composition and consist of clinopyroxene+plagioclase ± olivine ± hornblende phenocrysts. The geochemical characteristics show CALC-ALKALINE nature for the lavas that are formed in an ACTIVE CONTINENTAL MARGIN tectonic environment. Low amounts of MgO, Cr and Ni in the SARCHESHMEH EOCENE BASALTic lavas points to the role of evolution in their parental magma. The MORB normalized multi-element patterns of the lava flows show enrichment in LILE (e.g. Sr, K, Rb and Ba) and depletion in HFSE (e.g. Ta, Nb and Ti). The Chondrite-normalized REE patterns show moderate enrichments in LREE with (La/Yb)n<3 for all samples. The geochemical features such as (La/Yb)n<2, the Yb contents and also using petrological diagrams based on trace and rare earth element ratios (e.g. Th/Y, Nb/Y, Ta/Yb, Ce/Yb) indicate that the SARCHESHMEH EOCENE BASALTic lavas were generated from a metasomatized lithospheric mantle source at the spinel stability depth.

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APA: Copy

HOSSEINI, S.Z.. (2016). GEOCHEMISTRY, PETROGENESIS AND TECTONIC SETTING OF THE SARCHESHMEH EOCENE MAFIC LAVA FLOWS, SOUTHWEST OF RAFSANJAN. GEOSCIENCES, 25(100), 209-220. SID. https://sid.ir/paper/31692/en

Vancouver: Copy

HOSSEINI S.Z.. GEOCHEMISTRY, PETROGENESIS AND TECTONIC SETTING OF THE SARCHESHMEH EOCENE MAFIC LAVA FLOWS, SOUTHWEST OF RAFSANJAN. GEOSCIENCES[Internet]. 2016;25(100):209-220. Available from: https://sid.ir/paper/31692/en

IEEE: Copy

S.Z. HOSSEINI, “GEOCHEMISTRY, PETROGENESIS AND TECTONIC SETTING OF THE SARCHESHMEH EOCENE MAFIC LAVA FLOWS, SOUTHWEST OF RAFSANJAN,” GEOSCIENCES, vol. 25, no. 100, pp. 209–220, 2016, [Online]. Available: https://sid.ir/paper/31692/en

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