Rare earth element mineralogy, geochemistry, and preliminary resource assessment of the Khanneshin carbonatite complex, Helmand Province, Afghanistan

2011 ◽  
Author(s):  
Robert D. Tucker ◽  
Harvey E. Belkin ◽  
Klaus J. Schulz ◽  
Stephen G. Peters ◽  
Kim P. Buttleman
Keyword(s):  
Rare Earth ◽  
Rare Earth Element ◽  
Earth Element ◽  
Resource Assessment ◽  
Carbonatite Complex

A MAJOR LIGHT RARE-EARTH ELEMENT (LREE) RESOURCE IN THE KHANNESHIN CARBONATITE COMPLEX, SOUTHERN AFGHANISTAN

2012 ◽  
Vol 107 (2) ◽  
pp. 197-208 ◽  
Author(s):  
R. D. Tucker ◽  
H. E. Belkin ◽  
K. J. Schulz ◽  
S. G. Peters ◽  
F. Horton ◽  
...  
Keyword(s):  
Rare Earth ◽  
Rare Earth Element ◽  
Earth Element ◽  
Light Rare Earth Element ◽  
Light Rare Earth ◽  
Carbonatite Complex

scholarly journals Major, Trace, and Rare-Earth Element Geochemistry of Nb-V Rich Andradite-Schorlomite-Morimotoite Garnet from Ambadungar-Saidivasan Alkaline Carbonatite Complex, India: Implication for the Role of Hydrothermal Fluid-Induced Metasomatism

Minerals ◽  
2021 ◽  
Vol 11 (7) ◽  
pp. 756
Author(s):  
Amiya K. Samal ◽  
Rajesh K. Srivastava ◽  
Dewashish Upadhyay
Keyword(s):  
Rare Earth ◽  
Rare Earth Element ◽  
Hydrothermal Fluid ◽  
Earth Element ◽  
Primary Source ◽  
Active Role ◽  
Carbonatite Complex ◽  
Element Geochemistry ◽  
Convex Upward

In situ major, trace and rare-earth element composition of Ti-rich garnets from Ambadungar-Saidivasan alkaline carbonatite complex (ASACC) are presented to constrain its likely genesis. The garnets are characterized by high andradite (42.7–57.3), schorolomite (22.0–31.0), and morimotoite (15.6–26.5) end members. No distinct chemical zonation is noticed except for minor variations in Ti content. The garnets are enriched in LREE (average 731 ppm) and relatively depleted in HREE (average 186 ppm) and show an M-type first tetrad that leads to a convex upward pattern between Ce and Gd. Mildly positive to no Eu anomalies are observed (Eu/Eu* = 1.06–1.17). The REE patterns (LaN/YbN = 1.11–2.11) are similar to those of garnets from skarn deposits. The presence of tetrad effect in the LREE pattern suggests an active role of metasomatic processes involving hydrothermal fluids during the growth of the garnets. These garnets also contain high Nb (282–2283 ppm) and V (1083–2155 ppm) concentrations, which stand out against the composition of the host rock. Therefore, late-stage metasomatic reactions of earlier formed minerals with hydrothermal fluid enriched in Fe, Si, LREE, Nb, V, and Ti led to the formation of garnet. The primary source for these elements could be magnetite, ilmenite, and pyrochlore present in different varieties of carbonatites in the ASACC, with the required elements being released during their interaction with the hydrothermal fluid. The hydrothermal fluid was likely to be moderately acidic, and having fluoride and sulfate as the primary ligands.

scholarly journals Magmatic origin and petrogenesis characterization of syenite rock from Pakkanadu alkaline complex, Southern Granulite Terrain, India: Implication on emplacement and petrogenetic history

2021 ◽  
Vol 13 (4) ◽  
pp. 1214-1224
Author(s):  
P. Gangatharan ◽  
K. Anbarasu ◽  
M. Satyanarayanan
Keyword(s):  
Rare Earth ◽  
Rare Earth Element ◽  
Tamil Nadu ◽  
Earth Element ◽  
Alkaline Complex ◽  
Carbonatite Complex ◽  
Study Region ◽  
Magmatic Origin ◽  
South Indian ◽  
Granulite Terrain

The present study mainly focused on understanding the magmatic origin and petrogenesis characterization based on the Petrography, major, trace and Rare Earth Element (REE) signatures in the alkaline syenite from Pakkanadu alkaline carbonatite complex. The alkaline plutons from South Indian granulite terrain are intruded along with Archaean epidote-hornblende gneisses. The study area was carbonatite complexes of Tamil Nadu and is characterized by a group of rock associations Carbonatite-Syenite-Pyroxenite - Dunite. From Harker various patterns Pakkanadu alkaline complex syenite showed increasing trends of SiO2, Al2O3, Na2O + K2O opposite to decreasing order of CaO, Fe2O3, MgO, TiO2, P2O5 and MnO trend, suggest fractionation of clinopyroxene, hornblende, sphene, apatite and oxide minerals and feldspar that ruled the fractionation. The concentration of trace elements enriched in Large Ion lithophile elements  (LILE) (Ba, Sr, and Rb) elements and High Field Strength Elements (HFSEs) indicated that the dyke intrusion by differentiation of magma from a mantle source. Rare earth element (REE) distribution of Light rare earth element (LREE) enriched and High rare earth element (HREE) depleted pattern show strongly fractionated pattern with moderate Eu anomalies. Plots of tectonic discrimination diagrams of Pakkanadu samples fall in the field of syn-COLG field to the VAG syn- COLG field.     For the first time, this type of study was carried out in the study region in a detailed manner. The present study significantly exposed the petrography, petrogenesis and magmatic origin process in the Pakkanadu alkaline carbonatite complex. 

RARE EARTH ELEMENT AND THORIUM ASSAYING IN PARTS OF THE EAST COAST, INDIA

2016 ◽  
Author(s):  
Shayantani Ghosal ◽  
◽  
Sudha Agrahari ◽  
Debashish Sengupta
Keyword(s):  
Rare Earth ◽  
Rare Earth Element ◽  
Earth Element ◽  
East Coast
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