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Information Journal Paper

Title

INVESTIGATING FACIES AND MICRO FACIES OF SEDIMENTARY ENVIRONMENT NORTHWESTERN SHAHROOD, IRAN

Pages

 Start Page 17 | End Page 26

Keywords

LOWER JURASSIC (LIAS)Q3

Abstract

 The SHEMSHAK FORMATION with the age of the Jurassic is a thick clastic unit which was deposited in Alborz Zone. This article is going to research facies and sedimentary environment of this formation in eastern Alborz-Tazareh (1028 /Lias) lower Jurassic. Researches in this Zone have revealed the sequences and repetition of thick layers of sand stone – shale – shaly sand – coaly shale – silt – coaly sand- and coal. From a microscopic point of view 50 samples have been taken from this area, which resulted in the determination of six groups of facies and subfacies in 2 environments, namely river meandering and DELTAic environments. Also, vertical change of micro facies and related diagrams show the existence of 18 progressive and 19 regressive cycles by effect of atuocycliy in the region. So the sedimentary environment of the SHEMSHAK FORMATION is a step by step progressive area to the sea.

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