scholarly journals Geochemical Behavior of Trace- and Rare-Earth Elements in the Hydrothermal Alteration Facies of the Cijulang Area, West Java, Indonesia

2019 ◽  
Vol 09 (05) ◽  
pp. 278-294
Author(s):  
Myo Min Tun ◽  
I Wayan Warmada ◽  
Arifudin Idrus ◽  
Agung Harijoko ◽  
Kotaro Yonezu ◽  
...  
Keyword(s):  
Rare Earth ◽  
Rare Earth Elements ◽  
Hydrothermal Alteration ◽  
West Java ◽  
Geochemical Behavior

scholarly journals Rare Earth Elements (La, Ce, Pr, Nd, and Sm) from a Carbonatite Deposit: Mineralogical Characterization and Geochemical Behavior

Minerals ◽  
2018 ◽  
Vol 8 (2) ◽  
pp. 55 ◽  
Author(s):  
Mohamed Edahbi ◽  
Benoît Plante ◽  
Mostafa Benzaazoua ◽  
Lori Kormos ◽  
Mia Pelletier
Keyword(s):  
Rare Earth ◽  
Rare Earth Elements ◽  
Mineralogical Characterization ◽  
Geochemical Behavior

Geochemical behavior of rare earth elements during the evolution of CO2-rich groundwater: A study from the Kangwon district, South Korea

2009 ◽  
Vol 262 (3-4) ◽  
pp. 318-327 ◽  
Author(s):  
Hyeon-Su Choi ◽  
Seong-Taek Yun ◽  
Yong-Kwon Koh ◽  
Bernhard Mayer ◽  
Seong-Sook Park ◽  
...  
Keyword(s):  
Rare Earth ◽  
South Korea ◽  
Rare Earth Elements ◽  
Geochemical Behavior

Paleoproterozoic carbonatitic ultrabasic volcanic rocks (meimechites?) of Cape Smith Belt, Quebec

2001 ◽  
Vol 38 (9) ◽  
pp. 1313-1334 ◽  
Author(s):  
W RA Baragar ◽  
U Mader ◽  
G M LeCheminant
Keyword(s):  
Rare Earth ◽  
Rare Earth Elements ◽  
Hydrothermal Alteration ◽  
Regional Metamorphism ◽  
Volcanic Rocks ◽  
Light Rare Earth ◽  
Shallow Marine ◽  
Incompatible Elements ◽  
Thick Lens ◽  
Light Rare Earth Elements

A 500 m-thick lens of carbonatitic ultrabasic lapilli tuffs and lavas interbedded with platformal Povungnituk sediments in the foreland of the Cape Smith Belt is its earliest known magmatism and may relate to its initial rifting. The sequence comprises tuffs capped in part by effusives. Accretionary and cored lapilli in the tuffs and pillows in the lavas suggest emplacement in a shallow marine environment. Its current assemblage of antigorite, chlorite, talc, and (in part primary?) carbonate, magnetite, ilmenite, minor chromite, and phlogopite results from probable concurrent hydrothermal alteration and subsequent greenschist regional metamorphism. Surviving accessory minerals: apatite, monazite, zircon, rutile, and aeschenite(?) are widespread but scarce. Carbonate (mostly dolomite) is a major and integral component of the rock and interpreted as an original, albeit recrystallized, magmatic constituent. Magnetite is conspicuous in the tuffs: as lapilli and lapilli cores, locally as giant crystals, and as stringers. Except in subhedral groundmass crystals, its negligible TiO2 is evidence of its hydrothermal reconstitution. Compositions of chromite cores and rare relicts of phlogopite crystals are consistent with mantle derivation. Rock compositions are low in SiO2 (<35%) and Al2O3 (<3%), high in MgO (>25 wt.%) and alkaline. The immobile incompatible elements (e.g., Zr, average 260 ppm; Nb, average 130 ppm) and the light rare-earth elements are enriched. The rocks are compositionally similar to type Siberian meimechites and closely resemble the "meimechite"–carbonatite eruptives of Castignon Lake, Labrador Trough. Based on experimental evidence, Lac Leclair magmas are interpreted as originating by minor partial melting of carbonated mantle at ~100 km depths and reaching the surface via conduits opened by deep rifting that initiated the Cape Smith segment of the Trans-Hudson Orogen.

scholarly journals Trace and Rare Earth Elements Compositional Change on Andesite Alteration in Kaligesing, Purworejo

2020 ◽  
Vol 21 (1) ◽  
pp. 17
Author(s):  
Joko Subandrio ◽  
Ronaldo Irzon
Keyword(s):  
Rare Earth ◽  
Rare Earth Elements ◽  
Hydrothermal Alteration ◽  
Inductively Coupled Plasma ◽  
Microscopic Analysis ◽  
Inductively Coupled ◽  
Fine Grained ◽  
Central Java ◽  
Eu Anomaly ◽  
Plasma Mass Spectrometry

The change of chemical composition because of hydrothermal alteration process is related to the modification on mineralogy and elements mobility. Different alteration conditions could lead to dissimilar geochemical character. This study aims to discuss the alteration effect on trace and rare earth elements composition of an andesite outcrop with hydrothermal alteration in Kaligesing, Purworejo, Central Java Province. Microscopic analysis at Central for Geological Survey was applied to determine the modal mineral composition of the selected samples whilst trace and rare earth elements abundances was measured using Inductively Coupled Plasma – Mass Spectrometry. Plagioclase is the major phenocryst embedded in the fine-grained feldspar and glass groundmass of relatively fresh andesite. On the other hand, sericite, chlorite, epidote, and iron oxide are detected in the altered rock. The more Sr and Rb compositions on unaltered sample exhibit their common existence in plagioclase. The bigger Rb/Sr and the lower Ba/Sr ratios inward to the center of alteration might indicate the more degree of K-bearing mineral formation than Ca-rich mineral alteration. The Ba/Zr escalation and Zr/Y reduction from relatively fresh rock through to the vein of the studied samples are parallel to the previous investigation about andesite alteration. Chondrite-normalized rare-earth elements (REE) pattern of unaltered, altered, and vein samples depicts similar patterns: strong enrichment of Low REE, positive Eu anomaly, and relatively flat high REE. The decrease of Eu anomaly may reflect the reduction of plagioclase modal composition because of alteration and might indicate a reductive alteration state.Keywords: Alteration, andesite, geochemistry, trace and rare earth elements.

Geochemical behavior of rare earth elements in acid drainages: Modeling achievements and limitations

2020 ◽  
Vol 216 ◽  
pp. 106577 ◽  
Author(s):  
Alba Lozano ◽  
Carlos Ayora ◽  
Francisco Macías ◽  
Rafael León ◽  
María José Gimeno ◽  
...  
Keyword(s):  
Rare Earth ◽  
Rare Earth Elements ◽  
Geochemical Behavior
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