PETROGRAPHY AND GEOCHEMISTRY OF VOLCANIC ROCKS IN THE EAST OF NABAR (SW OF KASHAN) WITH EMPHASIS ON THE ROLE OF CRUSTAL CONTAMINATION

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EBRAHIMI LEILA; TABATABAEI MANESH SAYED MOHSEN

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Journal: PETROLOGY Year:2016 | Volume:7 | Issue:27 Page(s): 83-104

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Title

PETROGRAPHY AND GEOCHEMISTRY OF VOLCANIC ROCKS IN THE EAST OF NABAR (SW OF KASHAN) WITH EMPHASIS ON THE ROLE OF CRUSTAL CONTAMINATION

Author(s)

EBRAHIMI LEILA | TABATABAEI MANESH SAYED MOHSEN | Issue Writer Certificate

Keywords

GEOCHEMISTRYQ1

URUMIEH-DOKHTARQ2

VOLCANIC ROCKSQ2

KASHANQ2

NABARQ1

Abstract

The studied area is located in the east of NABAR village and southwest of KASHAN, a part of the Urumieh– Dokhtar magmatic arc. The VOLCANIC ROCKS belonging to Eocene age, are composed of pyroxene andesites, andesites, dacites and rhyolites. Porphyritic, glomeroporphyric, microlitic, and sieved textures are the most common textures of these rocks. Plagioclase, clinopyroxene and amphibole are the predominant minerals in the pyroxene andesites and andesites, whereas dacites and rhyolites are characterized by the presence of plagioclase, amphibole, quartz, biotite, and K-feldspar. Inequilibrium textures including embayed plagioclases and quartz with rounded margins, and oscillatory zoning in the plagioclases, sieved texture, and dusty rims are evidences of magma mixing. The enrichment in LREE and LILE and the HREE and HFSE depletion in the chondrite and primitive mantle normalized diagrams point to calc-alkaline nature of the rocks studied and they are related to volcanic arcs setting. High ratio of La/Nb (2-4.36) and negative Ti and Nb anomalies in spider diagrams can support crustal contamination hypotheses of these rocks. Also, low ratio of Nb/La (0.23-0.5) and high ratio of Sr/Ce (8.4-19) indicate contamination of parental magma with crustal materials. The rocks studied are formed from magma which is derived from enriched-mantle with 1-5 percent partial melting of spinel-lehrzolite.

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APA: Copy

EBRAHIMI, LEILA, & TABATABAEI MANESH, SAYED MOHSEN. (2016). PETROGRAPHY AND GEOCHEMISTRY OF VOLCANIC ROCKS IN THE EAST OF NABAR (SW OF KASHAN) WITH EMPHASIS ON THE ROLE OF CRUSTAL CONTAMINATION. PETROLOGY, 7(27 ), 83-104. SID. https://sid.ir/paper/197075/en

Vancouver: Copy

EBRAHIMI LEILA, TABATABAEI MANESH SAYED MOHSEN. PETROGRAPHY AND GEOCHEMISTRY OF VOLCANIC ROCKS IN THE EAST OF NABAR (SW OF KASHAN) WITH EMPHASIS ON THE ROLE OF CRUSTAL CONTAMINATION. PETROLOGY[Internet]. 2016;7(27 ):83-104. Available from: https://sid.ir/paper/197075/en

IEEE: Copy

LEILA EBRAHIMI, and SAYED MOHSEN TABATABAEI MANESH, “PETROGRAPHY AND GEOCHEMISTRY OF VOLCANIC ROCKS IN THE EAST OF NABAR (SW OF KASHAN) WITH EMPHASIS ON THE ROLE OF CRUSTAL CONTAMINATION,” PETROLOGY, vol. 7, no. 27 , pp. 83–104, 2016, [Online]. Available: https://sid.ir/paper/197075/en

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