Subduction-related Eocene shoshonites from the Cenozoic Urumieh-Dokhrat magmatic arc (Qaleh-Khargooshi area, West of the Yazd province, Iran)

GHODRAT TORABI

Article Details

Subduction-related Eocene shoshonites from the Cenozoic Urumieh-Dokhrat magmatic arc (Qaleh-Khargooshi area, West of the Yazd province, Iran)

Authors:

GHODRAT TORABI

Publisher:

TUBITAK

Main Topics:

Applied physics

Journal:

Turkish Journal of Earth Sciences 2009 Vol.18 Issue 4, pp.583-613

Document Type:

Article

Publication Date:

3/2009

Document Language:

English

Document ID (Org No.):

2000732306

Frequency:

Bimonthly

eISSN:

1303-619X

pISSN:

1300-0985

Abstract:

 

The fifth phase of Eocene volcanism in the central part of the Urumieh-Dokhtar magmatic arc (UDMA), comprises lavas with shoshonitic characteristics, ranging from trachybasalt to trachydacite. In shoshonites of the Qaleh-Khargooshi area, leucite changes to analcime, analcime to albite, sanidine to albite and anorthoclase, and clinopyroxene to albite. These reactions, together with other field, petrographic and geochemical features, are evidence of an original absarokitic magma which was changing to generate the different rock units. The parental magma of these shoshonites was produced by a low degree of partial melting from a metasomatized enriched mantle source. During the ascent of shoshonitic magma through the continental crust, crustal contamination, chemical changes and mineralogical transformations took place. The geochemistry of these shoshonitic rocks is similar to potassic volcanic rocks of continental arcs or convergent margins.

 

Urumieh-Dokhtar magmatik yayının (UDMA) orta kesimlerindeki Eosen volkanizmasının beşinci evresi trakibazaltan trakidasite kadar değişen şoşonitik karakterli lavları içermektedir. Qaleh-Khargooshi bölgesinin şoşonitlerinde lösit analsime, analsim albite, sanidin albit ve anortoklasa ve klinopiroksen de albite değişir. Bu reaksiyonlar ile arazi, petrogragik ve jeokimyasal özellikler birlikte farklı kaya birimlerini oluşturmak üzere değişime uğrayan orijinal absarokitik magmanın verilerini oluşturmaktadır. Bu şoşonitlerin kaynak magması metasomatize zenginleşmiş manto kaynağının düşük dereceli kısmi ergimeye uğraması sonucu oluşmuştur. Kıta kabuğu boyunca yükselen şoşonitik magmada kabuk kirlenmesi, kimyasal değişimler ve mineral dönüşümleri de gerçekleşmiştir. Şoşonitik kayaçların jeokimyası kıtasal yay veya çarpışan kıta kenarlarındaki potasik volkanik kayaçlarla benzerlik sunmaktadır.

Article Details

Subduction-related Eocene shoshonites from the Cenozoic Urumieh-Dokhrat magmatic arc (Qaleh-Khargooshi area, West of the Yazd province, Iran)

Authors: GHODRAT TORABI

Publisher: TUBITAK

Main Topics: Applied physics

Journal: Turkish Journal of Earth Sciences 2009 Vol.18 Issue 4, pp.583-613

Document Type: Article

Publication Date: 3/2009

Document Language: English

Document ID (Org No.): 2000732306

Frequency: Bimonthly

eISSN: 1303-619X

pISSN: 1300-0985

Issues

Authors:

GHODRAT TORABI

Publisher:

TUBITAK

Main Topics:

Applied physics

Journal:

Turkish Journal of Earth Sciences 2009 Vol.18 Issue 4, pp.583-613

Document Type:

Article

Publication Date:

3/2009

Document Language:

English

Document ID (Org No.):

2000732306

Frequency:

Bimonthly

eISSN:

1303-619X

pISSN:

1300-0985