Detailed Information on Publication Record
2014
Garnet as a major carrier of the Y and REE in the granitic rocks: An example from the layered anorogenic granite in the Brno Batholith, Czech Republic.
HÖNIG, Sven, Renata ČOPJAKOVÁ, Radek ŠKODA, Milan NOVÁK, David DOLEJŠ et. al.Basic information
Original name
Garnet as a major carrier of the Y and REE in the granitic rocks: An example from the layered anorogenic granite in the Brno Batholith, Czech Republic.
Authors
HÖNIG, Sven (203 Czech Republic, guarantor, belonging to the institution), Renata ČOPJAKOVÁ (203 Czech Republic, belonging to the institution), Radek ŠKODA (203 Czech Republic, belonging to the institution), Milan NOVÁK (203 Czech Republic, belonging to the institution), David DOLEJŠ (203 Czech Republic), Jaromír LEICHMANN (203 Czech Republic, belonging to the institution) and Michaela VAŠINOVÁ GALIOVÁ (203 Czech Republic, belonging to the institution)
Edition
American Mineralogist, Mineralogical Society of America. 2014, 0003-004X
Other information
Language
English
Type of outcome
Článek v odborném periodiku
Field of Study
10500 1.5. Earth and related environmental sciences
Country of publisher
United States of America
Confidentiality degree
není předmětem státního či obchodního tajemství
References:
Impact factor
Impact factor: 1.964
RIV identification code
RIV/00216224:14310/14:00076613
Organization unit
Faculty of Science
UT WoS
000342956700011
Keywords in English
Garnet; EMP; LA-ICP-MS; Y+REE mass-balance calculations; A-type granite; Brno Batholith
Změněno: 8/4/2015 13:42, Ing. Andrea Mikešková
Abstract
V originále
Garnet and other rock-forming minerals from A-type granite dykes in the Pre-Variscan Brno Batholith were analyzed to determine relative contributions of individual minerals to whole-rock Y and REE budget and to assess incorporation mechanisms of these elements in garnet. Minor to accessory garnet (<2 vol%) is the essential reservoir for Y+REE in the Hlína granite accounting ~84% Y and 61% REE of the total whole-rock budget. Zircon is another important carrier of REE with ~13% Y and ~11% REE. At least ~21% REE and 1% Y were probably hosted by Th- and U-rich monazite that has been completely altered to a mixture of secondary REE-bearing phases. The contribution of major rock-forming minerals (quartz and feldspars) is low (~1% Y; 10% LREE; ~1% HREE) excluding Eu, which is hosted predominantly by feldspars (~90%). Minor to accessory muscovite and magnetite incorporate ~1% Y and ~2% REE of the whole-rock budget. Magmatic garnet Sps41–46Alm28–44And0–13 Grs6–12Prp0–1 is Y- and HREE-rich (up 1.54 wt% Y; up ~1 wt% total REE), and the Y+REE enter the garnet structure via the menzerite-(Y) substitution. The Y and REE show complex zoning patterns and represent sensitive indicator of garnet evolution, in contrast to a homogeneous distribution of major divalent cations. General outward decrease of Y+REE is a common feature due to the strong partitioning of Y+HREE in the garnet relative to the other phases. REE underwent significant fractionation during growth of early garnet I; the YbN/NdN ratio generally decreases from the core to rim of garnet I. Higher Mn and Al, lower Ca, and Y+REE contents, as well as higher YbN/NdN ratio and more negative Eu anomaly in garnet II overgrowths indicate its crystallization from a more evolved melt. Application of zircon saturation geothermometry provides upper temperature limit of 734 ± 14 °C for the closed-system crystallization. Mineral equilibria reveal that crystallization started at QFM + 1.2, and preferential sequestration of Fe3+ into garnet and magnetite was responsible for progressively reducing conditions. Equilibrium between magnetite, garnet, quartz, and plagioclase, representing the final crystallization stage of the granitic magma, occurred at 658–663 °C and QFM 0 to + 0.8, hence at undercooling of ~75 °C.
Links
| CZ.1.05/1.1.00/02.0068, interní kód MU |
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