Geochemistry of enclaves and host granitoids from the kashan granitoid complex, central iran: Implications for enclave generation by interaction of cogenetic magmas

Maryam Honarmand; Nematollah Rashidnejad Omran; Franz Neubauer; Ghasem Nabatian; Mohammad Hashem Emami; Albrecht von Quadt; Yunpeng Dong; Manfred Bernroider

doi:10.1007/s12583-015-0584-1

Volume 26 Issue 5

Oct 2015

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Journal of Earth Science > 2015 > 26(5): 626-647.

Maryam Honarmand, Nematollah Rashidnejad Omran, Franz Neubauer, Ghasem Nabatian, Mohammad Hashem Emami, Albrecht von Quadt, Yunpeng Dong, Manfred Bernroider. Geochemistry of enclaves and host granitoids from the kashan granitoid complex, central iran: Implications for enclave generation by interaction of cogenetic magmas. Journal of Earth Science, 2015, 26(5): 626-647. doi: 10.1007/s12583-015-0584-1

Citation:

Maryam Honarmand, Nematollah Rashidnejad Omran, Franz Neubauer, Ghasem Nabatian, Mohammad Hashem Emami, Albrecht von Quadt, Yunpeng Dong, Manfred Bernroider. Geochemistry of enclaves and host granitoids from the kashan granitoid complex, central iran: Implications for enclave generation by interaction of cogenetic magmas. Journal of Earth Science, 2015, 26(5): 626-647. doi: 10.1007/s12583-015-0584-1

Citation:

Maryam Honarmand, Nematollah Rashidnejad Omran, Franz Neubauer, Ghasem Nabatian, Mohammad Hashem Emami, Albrecht von Quadt, Yunpeng Dong, Manfred Bernroider. Geochemistry of enclaves and host granitoids from the kashan granitoid complex, central iran: Implications for enclave generation by interaction of cogenetic magmas. Journal of Earth Science, 2015, 26(5): 626-647. doi: 10.1007/s12583-015-0584-1

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Geochemistry of enclaves and host granitoids from the kashan granitoid complex, central iran: Implications for enclave generation by interaction of cogenetic magmas

doi: 10.1007/s12583-015-0584-1

1.
Department of Earth Sciences, Institute for Advanced Studies in Basic Sciences (IASBS), Zanjan, 45195-1159, Iran
2.
Department of Geology, Faculty of Basic Sciences, Tarbiat Modares University, Tehran, 14155-175, Iran
3.
Department Geography and Geology, University of Salzburg, Salzburg, A-5020, Austria
4.
Department of Geology, Faculty of Sciences, University of Zanjan, Zanjan, 45195-1159, Iran
5.
Research Institute for Earth Sciences, Geological Survey of Iran, Tehran, 13185-1494, Iran
6.
Institute of Isotope Geology and Mineral Resources, ETH Zürich, Zürich, CH-8092, Switzerland
7.
State Laboratory of Continental Dynamics, Department of Geology, Northwest University, Xi'an, 710069, China

More Information

Corresponding author: Nematollah Rashidnejad Omran, rashid@modares.ac.ir
Received Date: 01 Dec 2014
Accepted Date: 06 May 2015
Publish Date: 01 Oct 2015

Abstract

Abstract

The major and trace elements and Sr-Nd-Pb isotopes of Miocene host granitoid rocks and their mafic microgranular enclaves (MMEs) were studied to understand the petrogenesis of MMEs in the Kashan complex, which is part of the Urumieh-Dokhtar magmatic belt (Iran). The host rocks consist of quartz-diorite and tonalite associated with a dioritic intrusion. The enclaves show microgranular texture and the same mineralogy as their respective host with plagioclase, quartz and biotite. MMEs have a diorite to quartz-diorite composition and show geochemical characteristics mostly between their granitoid host and the diorite intrusion. Chondrite-normalized REE patterns of all samples are moderately fractionated [(La/Yb)_N=2.1 to 12.9]. The MMEs display in part small negative Eu anomalies (Eu/Eu*=0.54 to 0.99), with enrichment of LILE and depletion of HFSE. The enclaves show emplacement depth of ~4 to 6 km which is comparable with the host rocks. Moreover, the Hornblende-plagioclase equilibrium temprature of MMEs yields average temperatures of 795℃ which is slightly higher than the host ones. Identical mineral compositions and Nd-Sr-Pb isotopic features of MME-host granitoid pairs indicate interactions and parallel evolution of MME and enclosing granitoid in the Kashan plutons. Additionally, the geochemical and isotopic investigations of host and dioritic intrusions suggest a common source for their genesis. A thermal anomaly induced by underplated basic magma into a hot crust would have caused partial melting in the lower crust to generate Kashan granitoid rocks.
- magma interaction,
- mafic microgranular enclave,
- radiogenic isotopes,
- granitoid rocks,
- Kashan,
- Urumieh-Dokhtar magmatic belt

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