Tectono-magmatic setting of diabase and basalt flows in north Makran ophiolite, southeast of Iran

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TAJVAR A.; KHATIB M.M.; ZARRINKOUB M.H.

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Journal: Iranian Journal of Geology Year:2020 | Volume:14 | Issue:55 Page(s): 67-79

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Information Journal Paper

Title

Tectono-magmatic setting of diabase and basalt flows in north Makran ophiolite, southeast of Iran

Author(s)

TAJVAR A. | KHATIB M.M. | ZARRINKOUB M.H. | Issue Writer Certificate

Keywords

North Makran ophioliteQ1

TholeiiteQ1

Basalt flowsQ1

DiabaseQ1

Calc-alkalineQ2

Abstract

The North Makran ophiolite in southeast of Iran, as a part of Tethyan ophiolites, is located between Lut and Bajkan-Durkan continental blocks. Among the rocks of this ophiolite sequence, Diabase and Basalt flows are present more abundant in the outcrops in the eastern part of the studied North Makran ophiolite. Structural, petrographic and geochemical evidences suggest distinct geodynamic setting for the formation of these rocks. Based on geochemical characteristics, Diabase and basalts fall into two groups: In the first group, tholeiitic Diabase and Basalt flows represent MORB-like affinity, and the second group include Calc-alkaline basaltic to dacitic lavas with arc environment and supra-subduction affinities. These two lava types represent two major magmatic events: 1) MORB-type magmatism resulted from Early Cretaceous rifting/opening between two continental blocks and resulted in the formation of tholeiitic Diabase and basalt. LREE enrichment, low La/Yb and relatively high U/Th ratios suggest continental influence in their melt source, and 2) subduction-related magmatism, that formed Calc-alkaline basaltic, andesitic and dacitic lavas in Late Cretaceous. LILE, LREE enrichment, Nb and Ta negative anomaly, low TiO2 concentrations and relatively high Ce/Pb ratio document subduction influence in their composition.

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APA: Copy

TAJVAR, A., KHATIB, M.M., & ZARRINKOUB, M.H.. (2020). Tectono-magmatic setting of diabase and basalt flows in north Makran ophiolite, southeast of Iran. IRANIAN JOURNAL OF GEOLOGY, 14(55 ), 67-79. SID. https://sid.ir/paper/382844/en

Vancouver: Copy

TAJVAR A., KHATIB M.M., ZARRINKOUB M.H.. Tectono-magmatic setting of diabase and basalt flows in north Makran ophiolite, southeast of Iran. IRANIAN JOURNAL OF GEOLOGY[Internet]. 2020;14(55 ):67-79. Available from: https://sid.ir/paper/382844/en

IEEE: Copy

A. TAJVAR, M.M. KHATIB, and M.H. ZARRINKOUB, “Tectono-magmatic setting of diabase and basalt flows in north Makran ophiolite, southeast of Iran,” IRANIAN JOURNAL OF GEOLOGY, vol. 14, no. 55 , pp. 67–79, 2020, [Online]. Available: https://sid.ir/paper/382844/en

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