scholarly journals Chlorite alteration in pegmatite from the Madan Pb-Zn deposits: mineral association, chemical composition and temperature of formation

2021 ◽  
Vol 82 (3) ◽  
pp. 70-72
Author(s):  
Rossitsa D. Vassileva ◽  
Georgi Milenkov ◽  
Sylvina Georgieva ◽  
Elitsa Stefanova
Keyword(s):  
Trace Elements ◽  
Chemical Composition ◽  
Mineral Assemblage ◽  
Secondary Mineral ◽  
Mineral Association ◽  
Minor And Trace Elements ◽  
Pegmatite Body ◽  
Host Rocks

Chlorites are common constituent of the secondary mineral assemblage formed as alteration products after aluminosilicate host rocks in the Pb-Zn deposits in Madan district. In concordant pegmatite body from the Petrovitsa deposit, they are formed after mica flakes. Such transformation often results in abundant rutile grains. The dominant chlorite compositions fall in the clinochlore-chamosite series. Minor and trace elements incorporation of Li, B, V, Co, Ni, Zn, Ga, Rb, Sr, Cs, and Ba is detected. Calculated To of formation ranges within 298–306 °C.

scholarly journals Less-common and rare earth elements of the Pechenga region ores

2021 ◽  
Vol 11 (3) ◽  
pp. 406-421
Author(s):  
K.V. Lobanov ◽  
◽  
A.V. Grigoryeva ◽  
A.V. Volkov ◽  
M.V. Chicherov ◽  
...  
Keyword(s):  
Trace Elements ◽  
Rare Earth ◽  
Chemical Composition ◽  
Rare Earth Elements ◽  
The Arctic ◽  
High Tech ◽  
Wide Range ◽  
Ore Minerals ◽  
High Enrichment ◽  
Host Rocks

The article presents the investigations in the Pechenga ore region — one of the largest industrial regions in the Arctic zone of Russia, located on the territory of the Murmansk area. The researchers obtained new data on the chemical composition of the main ore minerals, the content of trace elements, including rare earths (REE), in the ores of the Pilguyarvi and Vostok deposits and late polymetallic veins of the Pechenga region. They found that the main textural types of ores (massive, veined and disseminated) differ significantly in chemical composition and content of rock and ore-forming components. They also revealed the enrichment of ores with a wide range of trace elements. In comparison with the upper crust, the Pechenga ores are clearly enriched with chalcophilic and siderophilic trace elements. The enrichment coefficients of ore elements reach mainly tens (Cr, Au, Cd) hundreds (Ag, Se, Re, Pt) and thousands (Ni, Cu, Ir) times. The distribution of trace elements in various types of Cu-Ni ores has a great similarity, which indicates their geochemical affinity and synchronous participation in ore formation. The geochemical features are in good agreement with the mineral composition of the ores. The concentration of rare earth elements in the main types of ores, with the exception of massive ores and late polymetallic veins, exceeds the level of the chondrite standard and the REE fractionation is weak. The composition of the REE in ores came by from the host rocks. The research has established the high enrichment of all types of Re, Bi and Cd ores, which are potentially industrially significant as high-tech metals and are of considerable interest for associated mining.

scholarly journals Alteration zonation in the Loma Blanca kaolin deposit, Los Menucos, Province of Rio Negro, Argentina

Clay Minerals ◽  
2010 ◽  
Vol 45 (2) ◽  
pp. 157-169 ◽  
Author(s):  
S. A. Marfil ◽  
P. J. Maiza ◽  
N. Montecchiari
Keyword(s):  
Trace Elements ◽  
Chemical Composition ◽  
Mineral Assemblage ◽  
Lower Triassic ◽  
Zonation Pattern ◽  
Hydrothermal Processes ◽  
Rio Negro ◽  
Parent Rocks ◽  
The Relationship ◽  
Kaolin Deposit

AbstractThe Loma Blanca mine is in one of the northwest kaolinized zones of the Los Menucos area (Patagonia, Argentina). The parent rocks are andesites and andesitic tuffs from the Vera Formation, Los Menucos Group (Lower Triassic). Hayase & Maiza (1974) proposed a concentric zonation model. From the parent rock outward, four different alteration patterns were recognized: Zone 1, with sericite, chlorite and montmorillonite; Zone 2, with kaolinite and dickite; Zone 3, with dickite, pyrophyllite and alunite; and Zone 4, with quartz, disseminated sulphides and diaspore.The relationship between the chemical composition of major, minor and trace elements and the mineralogical alteration zonation was evaluated to confirm the genesis of the deposit. Fe2O3, CaO, Na2O and K2O contents decrease from Zone 1 to Zone 3, whereas Al2O3 and LOI increase in the kaolinite-alunite zone. In the chemical composition of alunite, Na > K. Large Ba, Sr, V and Zr contents were observed mainly in Zones 2 and 3. Co, Ni, Cu, Zn and Rb are more common in Zone 1. LREE are more abundant than HREE in Zones 2 and 3. In kaolinites, δ18O values range from 10.8% to 13.2%, and δD from –83% to –85%.The mineral assemblage (dickite-alunite-pyrophyllite-diaspore), the alteration zonation pattern (laterally concentric), the geochemistry of trace elements, the relation between LREE and HREE and the small δ18O values suggest that the Loma Blanca deposit was formed by hydrothermal processes.

Mineralogical controls on the distribution of trace elements in metasomatized peridotite enclaves from Planany, Czech Republic

2007 ◽  
Vol 71 (1) ◽  
pp. 81-91 ◽  
Author(s):  
J. V. Owen ◽  
J. Dostal ◽  
M. Fisera
Keyword(s):  
Trace Elements ◽  
Czech Republic ◽  
Reference Frame ◽  
Outer Layer ◽  
Reaction Zones ◽  
Host Rocks ◽  
Distribution Of Trace Elements

AbstractSmall (m-scale) peridotite enclaves at Planany (central Czech Republic) are separated from their gneissic host rocks by a narrow (cm-scale) reaction rim comprising an inner, tremolite + phlogopite zone and an outer, essentially monomineralic phlogopite zone. Both retain an Mg# very similar to that of the peridotite (Mg# = 81), but relative to this reference frame, show large increases in LILE (K, Rb, Ba) and radionuclides (U, Th). On a smaller scale, however, there has been a mineralogically-controlled decoupling of various components, particularly among the HFSE and REE, the former favouring the phlogopite-rich outer layer of the reaction rim, the latter the amphibole-rich inner zone. Taken together, however, the reaction zones preserve key compositional features of their inferred protolith.

scholarly journals Coal quality and major, minor, and trace elements in the Powder River, Green River, and Williston basins, Wyoming and North Dakota

2007 ◽  
Author(s):  
Gary D. Stricker ◽  
Romeo M. Flores ◽  
Michael H. Trippi ◽  
Margaret S. Ellis ◽  
Carol M. Olson ◽  
...  
Keyword(s):  
Trace Elements ◽  
North Dakota ◽  
Coal Quality ◽  
Green River ◽  
Minor And Trace Elements

scholarly journals Distribution of Major, Minor and Trace Elements in Iraqi Portland Cement

2003 ◽  
Vol 3 (1) ◽  
pp. 36-45
Author(s):  
Sahra M. O. Al-Maadhidee ◽  
Salem M. A. Al-Dabbagh
Keyword(s):  
Trace Elements ◽  
Portland Cement ◽  
Minor And Trace Elements

scholarly journals Eclogite-like rocks from Southern Pirin Mountains – preliminary results about petrology and time of formation

2021 ◽  
Vol 82 (3) ◽  
pp. 61-63
Author(s):  
Lyubomirka Macheva ◽  
Philip Machev ◽  
Rossitsa Vassilevа ◽  
Yulia Plotkina
Keyword(s):  
Mineral Assemblage ◽  
Late Jurassic ◽  
Mineral Chemistry ◽  
Metasomatic Alteration ◽  
Preliminary Results ◽  
Icp Ms ◽  
Geological Map ◽  
Host Rocks ◽  
The Village

North-northeast of the village of Ilinden (Southern Pirin Mnt.) three eclogite boudins were separated on the geological map in scale 1:50 000 (Sarov, 2010). The rocks belong to the Slasten lithotectonic unit. The mineral assemblage and mineral chemistry do not allow these rocks to be classified as eclogites. They can be considered as eclogite-like ones, formed by postmagmatic-metasomatic alteration of the host rocks. Based on LA-ICP-MS sphene U-Pb dating, eclogite-like rocks yield a Late Jurassic age (160±19 Ma).

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