The significance of mafic microgranular enclaves in the petrogenesis of the Qorveh granitoid complex, northern Sanandaj-Sirjan zone, Iran

Ashraf Torkian, Tanya Furman

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

The Sanandaj-Sirjan Zone originated during subduction of the Neo-Tethys oceanic crust beneath the Central Iranian microplate. Magmatic rocks exposed in this region are represented by a wide compositional range, with a preponderance of granitoids. The calc-alkaline Qorveh Granitoid Complex (QGC), located to the southeast of Qorveh, includes granodioritic and granitic intrusions that host mafic microgranular enclaves (MMEs). Geochemical, textural and mineral chemistry features of granitoid host rocks and MMEs are presented here. The host rocks and enclaves show disequilibrium textures (e.g., tabular plagioclase with inclusions of biotite+hornblende, resorbed plagioclases, needles of apatite and overgrowth of feldspar crystals). Field, textural and geochemical evidence suggest that these features result from incomplete mixing with the enclosing host rocks. Physicochemical conditions and mesoscopic features suggest that the enclaves cooled quickly without pervasive changes. Considering all data, the MMEs most likely formed by magma mingling processes. The injection and rapid cooling of successive pulses of mafic magma into granodioritic-granitic magma resulted in the formation of the observed enclaves. Rheological properties of these magmas inhibited mixing, but inter-diffusion of trace elements between melts was partly efficient.

Original languageEnglish (US)
Pages (from-to)117-133
Number of pages17
JournalNeues Jahrbuch fur Mineralogie, Abhandlungen
Volume192
Issue number2
DOIs
StatePublished - Jan 1 2015

Fingerprint

enclave
petrogenesis
granitoid
Rocks
host rock
magma
Apatites
plagioclase
Trace Elements
Needles
Minerals
Textures
microplate
Cooling
Tethys
hornblende
disequilibrium
oceanic crust
Crystals
apatite

All Science Journal Classification (ASJC) codes

  • Geochemistry and Petrology

Cite this

@article{560dc24e8aa1445ba4c795d051457a6b,
title = "The significance of mafic microgranular enclaves in the petrogenesis of the Qorveh granitoid complex, northern Sanandaj-Sirjan zone, Iran",
abstract = "The Sanandaj-Sirjan Zone originated during subduction of the Neo-Tethys oceanic crust beneath the Central Iranian microplate. Magmatic rocks exposed in this region are represented by a wide compositional range, with a preponderance of granitoids. The calc-alkaline Qorveh Granitoid Complex (QGC), located to the southeast of Qorveh, includes granodioritic and granitic intrusions that host mafic microgranular enclaves (MMEs). Geochemical, textural and mineral chemistry features of granitoid host rocks and MMEs are presented here. The host rocks and enclaves show disequilibrium textures (e.g., tabular plagioclase with inclusions of biotite+hornblende, resorbed plagioclases, needles of apatite and overgrowth of feldspar crystals). Field, textural and geochemical evidence suggest that these features result from incomplete mixing with the enclosing host rocks. Physicochemical conditions and mesoscopic features suggest that the enclaves cooled quickly without pervasive changes. Considering all data, the MMEs most likely formed by magma mingling processes. The injection and rapid cooling of successive pulses of mafic magma into granodioritic-granitic magma resulted in the formation of the observed enclaves. Rheological properties of these magmas inhibited mixing, but inter-diffusion of trace elements between melts was partly efficient.",
author = "Ashraf Torkian and Tanya Furman",
year = "2015",
month = "1",
day = "1",
doi = "10.1127/njma/2015/0275",
language = "English (US)",
volume = "192",
pages = "117--133",
journal = "Neues Jahrbuch fur Mineralogie, Abhandlungen",
issn = "0077-7757",
publisher = "E. Schweizerbart'sche Verlagsbuchhandlung",
number = "2",

}

TY - JOUR

T1 - The significance of mafic microgranular enclaves in the petrogenesis of the Qorveh granitoid complex, northern Sanandaj-Sirjan zone, Iran

AU - Torkian, Ashraf

AU - Furman, Tanya

PY - 2015/1/1

Y1 - 2015/1/1

N2 - The Sanandaj-Sirjan Zone originated during subduction of the Neo-Tethys oceanic crust beneath the Central Iranian microplate. Magmatic rocks exposed in this region are represented by a wide compositional range, with a preponderance of granitoids. The calc-alkaline Qorveh Granitoid Complex (QGC), located to the southeast of Qorveh, includes granodioritic and granitic intrusions that host mafic microgranular enclaves (MMEs). Geochemical, textural and mineral chemistry features of granitoid host rocks and MMEs are presented here. The host rocks and enclaves show disequilibrium textures (e.g., tabular plagioclase with inclusions of biotite+hornblende, resorbed plagioclases, needles of apatite and overgrowth of feldspar crystals). Field, textural and geochemical evidence suggest that these features result from incomplete mixing with the enclosing host rocks. Physicochemical conditions and mesoscopic features suggest that the enclaves cooled quickly without pervasive changes. Considering all data, the MMEs most likely formed by magma mingling processes. The injection and rapid cooling of successive pulses of mafic magma into granodioritic-granitic magma resulted in the formation of the observed enclaves. Rheological properties of these magmas inhibited mixing, but inter-diffusion of trace elements between melts was partly efficient.

AB - The Sanandaj-Sirjan Zone originated during subduction of the Neo-Tethys oceanic crust beneath the Central Iranian microplate. Magmatic rocks exposed in this region are represented by a wide compositional range, with a preponderance of granitoids. The calc-alkaline Qorveh Granitoid Complex (QGC), located to the southeast of Qorveh, includes granodioritic and granitic intrusions that host mafic microgranular enclaves (MMEs). Geochemical, textural and mineral chemistry features of granitoid host rocks and MMEs are presented here. The host rocks and enclaves show disequilibrium textures (e.g., tabular plagioclase with inclusions of biotite+hornblende, resorbed plagioclases, needles of apatite and overgrowth of feldspar crystals). Field, textural and geochemical evidence suggest that these features result from incomplete mixing with the enclosing host rocks. Physicochemical conditions and mesoscopic features suggest that the enclaves cooled quickly without pervasive changes. Considering all data, the MMEs most likely formed by magma mingling processes. The injection and rapid cooling of successive pulses of mafic magma into granodioritic-granitic magma resulted in the formation of the observed enclaves. Rheological properties of these magmas inhibited mixing, but inter-diffusion of trace elements between melts was partly efficient.

UR - http://www.scopus.com/inward/record.url?scp=84971493201&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84971493201&partnerID=8YFLogxK

U2 - 10.1127/njma/2015/0275

DO - 10.1127/njma/2015/0275

M3 - Article

AN - SCOPUS:84971493201

VL - 192

SP - 117

EP - 133

JO - Neues Jahrbuch fur Mineralogie, Abhandlungen

JF - Neues Jahrbuch fur Mineralogie, Abhandlungen

SN - 0077-7757

IS - 2

ER -