Refractory minerals

2011 ◽  
Keyword(s):  
Refractory Minerals

Behavior of traces of refractory minerals in the lithium metaborate fusion-acid dissolution procedure

1983 ◽  
Vol 55 (14) ◽  
pp. 2451-2453 ◽  
Author(s):  
Cyrus. Feldman
Keyword(s):  
Acid Dissolution ◽  
Lithium Metaborate ◽  
Refractory Minerals

scholarly journals Fort-Dauphin beach sands, south Madagascar: natural radionuclides and mineralogical studies

2020 ◽  
Vol 42 (2) ◽  
pp. 118-129 ◽  
Author(s):  
Hao Duong Van ◽  
Alinanja Lantoarindriaka ◽  
Adam Piestrzyński ◽  
Phan Trong Trinh
Keyword(s):  
Natural Radionuclides ◽  
Natural Radionuclide ◽  
Mineral Resources ◽  
Average Concentration ◽  
High Ratio ◽  
Beach Sand ◽  
High Concentration ◽  
Beach Sands ◽  
Refractory Minerals ◽  
Black Sands

The Fort-Dauphin beach sand placer occurs as black sands on the East-South of Madagascar. The placer contributes 2/3 of the total heavy mineral resources of this country. The major minerals of the deposit are monazite, zircon, quartz, garnet, spinel, sillimanite as non-refractory minerals; ilmenite, anatase, rutile, titanite, leucoxene, pseudorutile and as a refractory one. The average concentration of the ilmenite, monazite, zircon and other minerals is 66.72%, 2.3%, 2.8%, and 28.18% respectively. Ilmenite contains 63 wt.% of TiO2, Zircon - 44 wt.% of ZrO2, Monazite contains 53 wt.% of oxide rare earth elements (REE) and up to 2 wt.% of UO2 and 9 wt.% of ThO2. The total REE in the studied samples was observed high concentration up to 16000ppm and a high ratio of Σ LREE/Σ HREE>31. The principal natural radionuclide in this placer is 232Th with the concentration of 232Th from 2710 to 6000 ppm, 3620 ppm on average while for the 238U from 124 to 340 ppm, 237 ppm on average which are higher than the average of their in Earth’s crust 360 and 70 times respectively.

Dissolution of Silver and Gold with Sodium Hypochlorite and Hydrochloric Acid in Refractory Minerals (Mangano-Argentiferous)

2020 ◽  
Vol 37 (4) ◽  
pp. 1213-1220
Author(s):  
Guillermo Tiburcio-Munive ◽  
María M. Salazar-Campoy ◽  
Jesús L. Valenzuela-García ◽  
Ofelia Hernández-Negrete ◽  
Víctor Vázquez-Vázquez
Keyword(s):  
Hydrochloric Acid ◽  
Sodium Hypochlorite ◽  
Refractory Minerals

scholarly journals The origin of refractory minerals in comet 81P/Wild 2

2009 ◽  
Vol 73 (23) ◽  
pp. 7150-7161 ◽  
Author(s):  
Miaofang Chi ◽  
Hope A. Ishii ◽  
Steven B. Simon ◽  
John P. Bradley ◽  
Zurong Dai ◽  
...  
Keyword(s):  
Refractory Minerals

scholarly journals Widespread reworking of Hadean-to-Eoarchean continents during Earth’s thermal peak

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
C. L. Kirkland ◽  
M. I. H. Hartnady ◽  
M. Barham ◽  
H. K. H. Olierook ◽  
A. Steenfelt ◽  
...  
Keyword(s):  
Chemical Composition ◽  
Detrital Zircon ◽  
Stream Sediment ◽  
Mantle Melting ◽  
Crustal Growth ◽  
Isotopic Data ◽  
Sediment Samples ◽  
Thermal Peak ◽  
Preservation Potential ◽  
Refractory Minerals

AbstractThe nature and evolution of Earth’s crust during the Hadean and Eoarchean is largely unknown owing to a paucity of material preserved from this period. However, clues may be found in the chemical composition of refractory minerals that initially grew in primordial material but were subsequently incorporated into younger rocks and sediment during lithospheric reworking. Here we report Hf isotopic data in 3.9 to 1.8 billion year old detrital zircon from modern stream sediment samples from West Greenland, which document successive reworking of felsic Hadean-to-Eoarchean crust during subsequent periods of magmatism. Combined with global zircon Hf data, we show a planetary shift towards, on average, more juvenile Hf values 3.2 to 3.0 billion years ago. This crustal rejuvenation was coincident with peak mantle potential temperatures that imply greater degrees of mantle melting and injection of hot mafic-ultramafic magmas into older Hadean-to-Eoarchean felsic crust at this time. Given the repeated recognition of felsic Hadean-to-Eoarchean diluted signatures, ancient crust appears to have acted as buoyant life-rafts with enhanced preservation-potential that facilitated later rapid crustal growth during the Meso-and-Neoarchean.

Refractory minerals

2006 ◽  
pp. 441-445
Author(s):  
R. C. Doman ◽  
A. M. Alper
Keyword(s):  
Refractory Minerals

Polaragraphic Determination of Ferrous and Ferric Ion in Refractory Minerals

1956 ◽  
Vol 28 (1) ◽  
pp. 97-98 ◽  
Author(s):  
G. S. Bien ◽  
E. D. Goldberg
Keyword(s):  
Ferric Ion ◽  
Refractory Minerals
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