Petrography and Geochemistry of Major Elements of Oligocene Terrigenous Deposits in Binalood Zone, North Neyshabour: Parent Rocks, Tectonic Setting and Paleoweathering Condition

Dehnavi, D; Moussavi-Harami, S.R; Mahmudy Gharaie, M.H; Ghaemi, F; Ghaemi, F

doi:10.22071/gsj.2014.43983

Petrography and Geochemistry of Major Elements of Oligocene Terrigenous Deposits in Binalood Zone, North Neyshabour: Parent Rocks, Tectonic Setting and Paleoweathering Condition

Document Type : Original Research Paper

Authors

D Dehnavi ¹

S.R Moussavi-Harami ²

M.H Mahmudy Gharaie ³

F Ghaemi ⁴

F Ghaemi ⁵

¹ M.Sc., Department of Geology, Faculty of Science, Ferdowsi University of Mashhad, Mashhad, Iran

² Professor, Department of Geology, Faculty of Science, Ferdowsi University of Mashhad, Mashhad, Iran

³ Assistant Professor, Department of Geology, Faculty of Science, Ferdowsi University of Mashhad, Mashhad, Iran

⁴ Associate Professor, Department of Geology, Faculty of Science, Ferdowsi University of Mashhad, Mashhad, Iran

⁵ M.Sc., Geological Survey of Iran North- East Territory, Mashhad, Iran

10.22071/gsj.2014.43983

Abstract

For understanding parent rocks, tectonics setting, paleoweathering condition and classification of Binalood’s Oligocene deposits, the petrography analysis was done, on samples from Damanjan and Baghshan-Gach sections, north of Neyshabour. 14 sandstones and 6 shale samples from both sections were analyzed for major elements. Petrographic studies and geochemical data show that these sandstones are Litharenite to lithic arkose and have been deposited in tectonics setting including active continental margin for Damanjan section and continental island arc for Baghshan-Gach section with felsic to intermediate source. Based on elemental analysis, paleoweathering condition was relatively weak at the time of deposition in both sections; however, paleoweathering was stronger in Damanjan than Baghshan –Ghch sections. Also, using petrographic and elemental data, it can be concluded that the paleoclimate was semi-humid to semi-arid at the time of deposition.

Keywords

Oligocene

Weathering

Litharenite

Arkos

Felsic