Details
| Original language | English |
|---|---|
| Pages (from-to) | 197-219 |
| Number of pages | 23 |
| Journal | Neues Jahrbuch für Mineralogie: Abhandlungen |
| Volume | 190 |
| Issue number | 2 |
| Publication status | Published - Apr 2013 |
Abstract
Major and trace element geochemistry and experimental data are combined to discuss the crystallization of a ferroan granite, the Baga-Gazriin Chuluu pluton (Mongolia). The granite samples have nearly eutectic compositions and the evolution of the major element composition of the granites is controlled by concomitant crystallization of quartz, alkali feldspar and plagioclase from the beginning of crystallization. The crystallization of the tectosilicate phases occurred at ~810 °C, implying low water concentrations in the rhyolitic silicate melts (3 wt % H2O or less). Fractionation processes occurred mainly in the temperature range 810 -760 °C. The absence of fractionation at lower temperature is explained by the high crystal content of water-poor magma below 760 °C. Considering that most of the crystallization of the water-poor magma may occur under fluid-absent conditions, the classical explanation for the lanthanide tetrad effect observed in high-Si granites has to be reconsidered.
Keywords
- A-type granites, Central Mongolia, Geochemistry, Tetrad effect, Trace element distribution
ASJC Scopus subject areas
- Earth and Planetary Sciences(all)
- Geochemistry and Petrology
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In: Neues Jahrbuch für Mineralogie: Abhandlungen, Vol. 190, No. 2, 04.2013, p. 197-219.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Role of water on fractionation processes and trace element distribution in A-type granites
T2 - The example of the Baga-Gazriin Chuluu granites (Central Mongolia)
AU - Machowiak, Katarzyna
AU - Holtz, François
AU - Stawikowski, Wojciech
AU - Cia̧zela, Jakub
N1 - Copyright: Copyright 2013 Elsevier B.V., All rights reserved.
PY - 2013/4
Y1 - 2013/4
N2 - Major and trace element geochemistry and experimental data are combined to discuss the crystallization of a ferroan granite, the Baga-Gazriin Chuluu pluton (Mongolia). The granite samples have nearly eutectic compositions and the evolution of the major element composition of the granites is controlled by concomitant crystallization of quartz, alkali feldspar and plagioclase from the beginning of crystallization. The crystallization of the tectosilicate phases occurred at ~810 °C, implying low water concentrations in the rhyolitic silicate melts (3 wt % H2O or less). Fractionation processes occurred mainly in the temperature range 810 -760 °C. The absence of fractionation at lower temperature is explained by the high crystal content of water-poor magma below 760 °C. Considering that most of the crystallization of the water-poor magma may occur under fluid-absent conditions, the classical explanation for the lanthanide tetrad effect observed in high-Si granites has to be reconsidered.
AB - Major and trace element geochemistry and experimental data are combined to discuss the crystallization of a ferroan granite, the Baga-Gazriin Chuluu pluton (Mongolia). The granite samples have nearly eutectic compositions and the evolution of the major element composition of the granites is controlled by concomitant crystallization of quartz, alkali feldspar and plagioclase from the beginning of crystallization. The crystallization of the tectosilicate phases occurred at ~810 °C, implying low water concentrations in the rhyolitic silicate melts (3 wt % H2O or less). Fractionation processes occurred mainly in the temperature range 810 -760 °C. The absence of fractionation at lower temperature is explained by the high crystal content of water-poor magma below 760 °C. Considering that most of the crystallization of the water-poor magma may occur under fluid-absent conditions, the classical explanation for the lanthanide tetrad effect observed in high-Si granites has to be reconsidered.
KW - A-type granites
KW - Central Mongolia
KW - Geochemistry
KW - Tetrad effect
KW - Trace element distribution
UR - http://www.scopus.com/inward/record.url?scp=84879858876&partnerID=8YFLogxK
U2 - 10.1127/0077-7757/2013/0233
DO - 10.1127/0077-7757/2013/0233
M3 - Article
AN - SCOPUS:84879858876
VL - 190
SP - 197
EP - 219
JO - Neues Jahrbuch für Mineralogie: Abhandlungen
JF - Neues Jahrbuch für Mineralogie: Abhandlungen
SN - 0077-7757
IS - 2
ER -