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Paper Information

Journal:   GEOSCIENCES   FALL 2009 , Volume 19 , Number 73; Page(s) 79 To 88.
 
Paper: 

PETROGRAPHY, TECTONIC SETTING AND GENESIS OF OLIGOCENE - MIOCENE IGNEOUS ROCKS IN NORTHERN PART OF RAZAN AREA

 
 
Author(s):  MOHAMMADI R.*, EMAMI M.H., VOSOGHIABEDINI M.
 
* FACULTY OF BASIC SCIENCES, ASHTIAN BRANCH, AZAD UNIVERSITY, TEHRAN, IRAN
 
Abstract: 

The area is located about 230 km of southwest of Tehran. Based of geological observations, the plutonic rocks in the area consist of Neogene (Miocene) alkaline gabbro, gabbrodiorite, locogabbro and diabase. The Oligo - Miocene calc-alkaline extrusive rocks are dacite - ryodacite, andesite trachyandesite, hornblendandesite, basaltic andesite and trachybasalt. Studying on isotopic analyses of Nd and Sr indicate that surveyed area were contaminated with crustal rocks of Sialic composition .In isotropy geochemical studies, The Andesite samples are plotted in the limit of BSE; however, it seems that mantling rocks besides being settled in crust (esp. the upper continental crust) have been contaminated with in. The combination of BSE towards enrichment, from the proportion of 87Sr/86Sr has shifted; a sample of rocks shows this position. Spider diagrams related to trace elements of plutonic samples which are used for identifying the tectonic setting show intrusive are in the extensive regime; while the lavas don't have a steady trend and are similar to subduction zones. This shows that the intrusive of the investigated area are different genesis from the southern volcanic rocks.

 
Keyword(s): MAGMATIC GENESIS, ISOTOPIC GEOCHEMISTRY, AVAJ, RAZAN, MAGMATIC CONTAMINATION, VOLCANIC ROCKS, PLUTONIC ROCKS
 
 
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APA: Copy

MOHAMMADI, R., & EMAMI, M., & VOSOGHIABEDINI, M. (2009). PETROGRAPHY, TECTONIC SETTING AND GENESIS OF OLIGOCENE - MIOCENE IGNEOUS ROCKS IN NORTHERN PART OF RAZAN AREA. GEOSCIENCES, 19(73), 79-88. https://www.sid.ir/en/journal/ViewPaper.aspx?id=274670



Vancouver: Copy

MOHAMMADI R., EMAMI M.H., VOSOGHIABEDINI M.. PETROGRAPHY, TECTONIC SETTING AND GENESIS OF OLIGOCENE - MIOCENE IGNEOUS ROCKS IN NORTHERN PART OF RAZAN AREA. GEOSCIENCES. 2009 [cited 2021May16];19(73):79-88. Available from: https://www.sid.ir/en/journal/ViewPaper.aspx?id=274670



IEEE: Copy

MOHAMMADI, R., EMAMI, M., VOSOGHIABEDINI, M., 2009. PETROGRAPHY, TECTONIC SETTING AND GENESIS OF OLIGOCENE - MIOCENE IGNEOUS ROCKS IN NORTHERN PART OF RAZAN AREA. GEOSCIENCES, [online] 19(73), pp.79-88. Available: https://www.sid.ir/en/journal/ViewPaper.aspx?id=274670.



 
 
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