Ubiquitous accessory minerals occur in association with this pegmatite The presence of garnet gahnite muscovite tourmaline and aluminosilicates indicates the granite pegmatite is typical of the peraluminous nature The present study involves the mineral chemistry of gahnite garnet and columbite tantalite phases using electron probe micro
The Bailongshan deposit is a newly discovered super large lithium polymetallic pegmatite deposit Garnets occur widely in muscovite granites and pegmatites at Bailongshan but comprehensive study is yet to be done on the geochemical evolution of garnet from
Download scientific diagram Distribution coefficients K d for REE in meta pegmatite garnets calculated from bulk rock and means of LA ICP MS garnet analyses Negative Eu anomalies of samples
The Chuanziyuan deposit which is located in Pingjiang County Hunan Province is a typical pegmatite type Li Nb Ta ore deposit Analyses of major trace and volatile elements of spodumene and
In northern Vietnam gem corundums are found in the Luc Yen Yen Bai and Quy Chau areas in primary deposits hosted by metamorphic rocks and in placers In secondary deposits ruby and sapphire are associated with gem spinel and garnet In southern Vietnam sapphires are related to alkaline basalts with blue sapphires being economic
A precision of % was achieved for one garnet sample from a REE rich pegmatite For the analysed apatite samples in situ Lu Hf dates were obtained that correspond within 93 to 98% of associated U Pb ages Apatite samples OD306 and CS5 are used to constrain Lu Hf matrix fractionation between apatite and glass to % The achieved precision
Two generations of garnet are recognized in a granite and a pegmatite from the Gangdese orogen in southeastern Tibet on the basis of a combined study of petrography major and trace element profiles and garnet O isotopes Zircon U Pb dating and Hf
Chemical data indicate that the pegmatite and aplite hosted garnets are rich in spessartine and are similar to garnets in many African Li rich pegmatites Partial melting as a source of the garnets is unlikely due to the large spessartine component the abundance of inclusions within the garnets and the general P T X evolution of the pegmatite
The Kontum Massif located in central Vietnam played an essential role in the evolution of Indochina and its adjacent areas The Van Canh granites exposed throughout the Southern Kontum Massif
In this pegmatite the garnet layer is composed of a matrix of blocky plagioclase K feldspar muscovite and quartz Along with the garnets schorl crystals appear to grow perpendicularly to the garnet layer showing a comb texture Figure 3c This directional texture of tourmaline crystals is also common in the contact of the
The Mn content of garnet in pegmatite stage are positively related to the magmatic evolution garnet with high Mn content MnO>% is a sign of highly fractionated and mineralized pegmatite At the same time it is also a mineralogical sign of Li mineralization
The magmatic garnet of seven granitic NYF niobium yttrium fluorine enriched granitic pegmatites from the Froland and Evje Iveland areas in southern Norway were studied with respect to their major and trace element composition and intracrystalline distribution of major and minor elements The increasing average MnO/ FeO MnO values of the garnet grains
Garnet data for the Koktokay No 3 pegmatite are from Zhou et al 2015 ; b Chondrite normalized REE pattern for garnet from the Yamrang and Sangsabu pegmatites; c variation of ∑REE vs Y in garnet from Yamrang and Sangsabu pegmatite Red arrows show the trend of increasing fractionation from the core to the rim
Garnet is one of the common accessory minerals in the fine grained albite phase We report the first in situ LA ICP MS U Pb age of garnet from pegmatite dikes yielding an age of ± Ma which is consistent with the age of the associated granitic pluton
Chemical analyses of muscovite garnet and coltan from various pegmatite zones reveal a gradual increase in the degree of differentiation and volatile components of the Early Cretaceous magmatic system from north to south
The zonings of Y REE and Sc in garnet are mainly controlled by the composition of pegmatite forming melt and consumption of these elements due to the growth of garnet itself and other minerals
Two generations of garnet are recognized in a granite and a pegmatite from the Gangdese orogen in southeastern Tibet on the basis of a combined study of petrography major and trace element profiles and garnet O isotopes Zircon U Pb dating and Hf O isotope compositions also help constrain the origin of both granite and pegmatite The first generation of garnet Grt I occurs
Except for some pegmatites that are linked to crustal anatexis Müller et al 2017 pegmatites are considered to broadly granitic intrusive bodies with three possible models of evolution 1 inward stepwise crystallization of highly fluxed granitic melts from the margin of the pegmatite body London 2022 Sirbescu et al 2017 ; 2 buoyant separation of aqueous
Abstract Electron microprobe analyses of almandine spessartine garnets from pegmatites and aplites from the Hub Kapong batholith and Phuket Island in peninsular Thailand show three types of zoning Garnets from pegmatites show extreme zoning with Mn rich cores ⋍ 80 % spessartine and Mn poor rims ⩾ 40 % spessartine whereas those from aplites are either
The Kontum Massif located in central Vietnam played an essential role in the evolution of Indochina and its adjacent areas The Van Canh granites exposed throughout the Southern Kontum Massif
