LITHOSTRATIGRAPHY AND BIOSTRATIGRAPHY OF THE MIDDLE PART OF THE SHEMSHAK GROUP AT GOLBINISECTION BASED ON AMMONITES, NE JAJARM, EASTERN ALBORZ

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KIADALIRI Z.; MAJIDIFARD M.R.

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Journal: GEOSCIENCES Year:2015 | Volume:24 | Issue:94 (STRATIGRAPHY & SEDIMENTOLOGY) Page(s): 91-100

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Information Journal Paper

Title

LITHOSTRATIGRAPHY AND BIOSTRATIGRAPHY OF THE MIDDLE PART OF THE SHEMSHAK GROUP AT GOLBINISECTION BASED ON AMMONITES, NE JAJARM, EASTERN ALBORZ

Author(s)

KIADALIRI Z. | MAJIDIFARD M.R. | Issue Writer Certificate

Keywords

SHEMSHAK GROUPQ2

LITHOSTRATIGRAPHYQ2

BIOSTRATIGRAPHYQ2

JURASSICQ2

AMMONITEQ2

EASTERN ALBORZQ2

JAJARMQ2

Abstract

The Lower- Middle JURASSIC strata are well developed in northeast of JAJARM (E Alborz). At the study section, the SHEMSHAK GROUP has a maximum thickness of 585 m, consisting of grey silty sandstones and light- green siltstones with brown sandstones, subdivided into 3 formations ofAlasht, Shirindasht and Fillzamin. The lower boundary of the SHEMSHAK GROUP at Golbini sectionwith the red bauxite horizon of the underlying Elikah Formation is disconformity due to the EarlyCimmerian tectonic event.Its upper boundary with marly limestone and marl of the Dalichai Formation is disconformity, too. In the SHEMSHAK GROUP at the study section, summing up 186 fossil specimens were collected, among which the ammonoids with 67 specimens clearly predominate and belonging to 6 biozones (ThouarsenseZone, Pseudoradiosa Zone, Aalensis zone, Opalinum Zone, Murchisonaezone, ConcavumZone) have been recognized. Based on the AMMONITE fauna, the age of the SHEMSHAK GROUP in the investigated area ranges from the Upper Toarcian to Upper Aalenian. Pale obiogeographically, the fauna shows close relationship to Northwestern Europe and Sub-Mediterranean regions. This indicates a pale ogeographical position of the area at the northern Tethys during the Lower-Middle JURASSIC.

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APA: Copy

KIADALIRI, Z., & MAJIDIFARD, M.R.. (2015). LITHOSTRATIGRAPHY AND BIOSTRATIGRAPHY OF THE MIDDLE PART OF THE SHEMSHAK GROUP AT GOLBINISECTION BASED ON AMMONITES, NE JAJARM, EASTERN ALBORZ. GEOSCIENCES, 24(94 (STRATIGRAPHY & SEDIMENTOLOGY)), 91-100. SID. https://sid.ir/paper/32186/en

Vancouver: Copy

KIADALIRI Z., MAJIDIFARD M.R.. LITHOSTRATIGRAPHY AND BIOSTRATIGRAPHY OF THE MIDDLE PART OF THE SHEMSHAK GROUP AT GOLBINISECTION BASED ON AMMONITES, NE JAJARM, EASTERN ALBORZ. GEOSCIENCES[Internet]. 2015;24(94 (STRATIGRAPHY & SEDIMENTOLOGY)):91-100. Available from: https://sid.ir/paper/32186/en

IEEE: Copy

Z. KIADALIRI, and M.R. MAJIDIFARD, “LITHOSTRATIGRAPHY AND BIOSTRATIGRAPHY OF THE MIDDLE PART OF THE SHEMSHAK GROUP AT GOLBINISECTION BASED ON AMMONITES, NE JAJARM, EASTERN ALBORZ,” GEOSCIENCES, vol. 24, no. 94 (STRATIGRAPHY & SEDIMENTOLOGY), pp. 91–100, 2015, [Online]. Available: https://sid.ir/paper/32186/en

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