Rare Earth Elements in No. 2 Coal of Huangling Mine, Huanglong Coalfield, China

2012 ◽  
Vol 30 (5) ◽  
pp. 803-818 ◽  
Author(s):  
Cunliang Zhao ◽  
Dujuan Duan ◽  
Yanheng Li ◽  
Jianya Zhang
Keyword(s):  
Rare Earth ◽  
Rare Earth Elements ◽  
Depositional Environment ◽  
Ordos Basin ◽  
Average Concentration ◽  
Source Rocks ◽  
Tectonic Activity ◽  
Geochemical Anomaly ◽  
Metallogenic Belt ◽  
Reported Data

Rare earth elements (REEs) can provide lots of information relevant to the evolution of source rocks, depositional environment, and epigenetic tectonic activity. In this study, 14 bench samples (including 11 coals, 1parting, 1roof and 1floor) of the No. 2 coal seam from Huangling Mine, Huanglong Coalfield, Ordos Basin, China were collected to study the REE geochemistry. The average concentration of REEs is 44.03 μg/g, and it is lower than those in coals of the Chinese and world coal. The coals are enriched in light REEs and the LREEs-HREEs have been highly fractionated, with an average (La/Yb) N of 11.38. The values of Ce/Ce* are more or less than 1 (with an average 0.92) and indicates that the anomaly of Ce is very slight. However, the values of Eu/Eu* (with an average 7.69 of coal) are distinctly higher than reported data of coals. The extremely high contents of Ba caused the geochemical anomaly of REEs. The Ba2+ was origin from the barium metallogenic belt in Qinling Old-upland.

Petrography and geochemical characteristics of Chang 7 sandstone in Yanhe profile, Ordos Basin: Implication for paleoenvironment and tectonic background

2020 ◽  
Vol 8 (4) ◽  
pp. T981-T990
Author(s):  
Haijun Gao ◽  
Delu Li ◽  
Dingming Dong ◽  
Hongjun Jing ◽  
Hao Tang
Keyword(s):  
Grain Size ◽  
Rare Earth ◽  
Rare Earth Elements ◽  
Ordos Basin ◽  
Island Arc ◽  
Geochemical Characteristics ◽  
Hydrocarbon Exploration ◽  
Source Rocks ◽  
Grain Size Analysis ◽  
Alkaline Basalt

The Chang 7 oil layer from the upper Triassic Yanchang Formation is an important layer for hydrocarbon exploration. Most studies on the Chang 7 oil layer have focused on the source rocks, while research on the sandstone is still inadequate, especially on the petrography and geochemical characteristics. Using seven sandstone samples of the Chang 7 oil layer in the Yanhe profile, the grain-size analysis, major elements, trace elements, and rare earth elements were tested. The results find that the sandstone of fine-grained sediments of the Chang 7 oil layer is dominated by arkose with a minor number of lithic arkose. The range of grain size (Mz) is from 2.72 to 3.92 Φ, and the C value and M value of the sandstone samples suggest characteristics of turbidity deposition. The Al/Si ratios of all of the samples imply high clay mineral content. The results of trace and rare earth elements demonstrate the reducing condition, freshwater, and cold and dry weather. The provenance of the sandstone samples is mainly from island arc acidic volcanic rock, and the type of provenance is mixed with sedimentary rock, granite, and alkaline basalt. The tectonic background is continental island arc. This study provides a systematic geologic foundation for the formation of sandstone of Chang 7 oil layer in Ordos Basin.

Rare Earth Elements: A Tool for Understanding the Behaviour of Trivalent Actinides in the Geosphere

2006 ◽  
Vol 985 ◽  
Author(s):  
Belen Buil ◽  
Paloma Gómez ◽  
Antonio Garralón ◽  
M. Jesús Turrero
Keyword(s):  
Rare Earth ◽  
Rare Earth Elements ◽  
Source Rocks ◽  
Uranium Mine ◽  
Colloidal Transport ◽  
Trivalent Actinides ◽  
Aqueous Complexes ◽  
Ree Patterns

AbstractREE concentrations have been determined in groundwaters, granite and fracture fillings in a restored uranium mine.The granitoids normalized REE patterns of groundwaters show HREE-enrichment and positive Eu anomalies. This suggests that the REE are fractionated during leaching from the source rocks by groundwaters. Preferential leaching of HREE would be consistent with the greater stability of their aqueous complexes compared to those of the LREE, together with the dissolution of certain fracture filling minerals, dissolution/alteration of phyllosilicates and colloidal transport.

Rare earth elements as indicators of the tectonic activity of the basement (with reference to the Voronezh anteclise)

2008 ◽  
Vol 423 (2) ◽  
pp. 1467-1468 ◽  
Author(s):  
V. A. Shatrov ◽  
V. I. Sirotin ◽  
G. V. Voitsekhovsky ◽  
E. E. Belyavtseva
Keyword(s):  
Rare Earth ◽  
Rare Earth Elements ◽  
Tectonic Activity ◽  
Voronezh Anteclise

scholarly journals Li-Co–Ni-Mn-(REE) veins of the Western Erzgebirge, Germany—a potential source of battery raw materials

2021 ◽  
Author(s):  
Mathias Burisch ◽  
Max Frenzel ◽  
Henning Seibel ◽  
Albert Gruber ◽  
Marcus Oelze ◽  
...  
Keyword(s):  
Rare Earth ◽  
Rare Earth Elements ◽  
Raw Materials ◽  
Metal Sulfide ◽  
Tectonic Activity ◽  
Light Rare Earth ◽  
Bulk Rock ◽  
Polymetallic Mineralization ◽  
High Concentrations ◽  
Light Rare Earth Elements

AbstractSituated in the western Erzgebirge metallogenetic province (Vogtland, Germany), the Eichigt prospect is associated with several quartz-Mn-Fe-oxyhydroxide veins that are exposed at surface. Bulk-rock geochemical assays of vein material yield high concentrations of Li (0.6–4.1 kg/t), Co (0.6–14.7 kg/t), and Ni (0.2–2.8 kg/t), as well as significant quantities of Mn, Cu, and light rare earth elements, a very unusual metal tenor closely resembling the mixture of raw materials needed for Li-ion battery production. This study reports on the results of a first detailed investigation of this rather unique polymetallic mineralization style, including detailed petrographic and mineralogical studies complemented by bulk rock geochemistry, electron microprobe analyses, and laser ablation inductively coupled mass spectrometry. The mineralized material comprises an oxide assemblage of goethite hematite, hollandite, and lithiophorite that together cement angular fragments of vein quartz. Lithiophorite is the predominant host of Li (3.6–11.1 kg/t), Co (2.5–54.5 kg/t), and Ni (0.2–8.9 kg/t); Cu is contained in similar amounts in hollandite and lithiophorite whereas light rare earth elements (LREE) are mainly hosted in microcrystalline rhabdophane and florencite, which are finely intergrown with the Mn-Fe-oxyhydroxides. 40Ar/39Ar ages (~ 40–34 Ma) of coronadite group minerals coincide with tectonic activity related to the Cenozoic Eger Graben rifting. A low-temperature hydrothermal overprint of pre-existing base metal sulfide-quartz mineralization on fault structures that were reactivated during continental rifting is proposed as the most likely origin of the polymetallic oxyhydroxide mineralization at Eichigt. However, tectonically enhanced deep-reaching fracture-controlled supergene weathering cannot be completely ruled out as the origin of the mineralization.

Mineralogy, rare earth elements geochemistry and genesis of the Keban-West Euphrates (Cu-Mo)-Pb-Zn skarn deposit (Eastern Taurus metallogenic belt, E Turkey)

2019 ◽  
Vol 114 ◽  
pp. 103102 ◽  
Author(s):  
Esra Yıldırım ◽  
Nail Yıldırım ◽  
Cahit Dönmez ◽  
Sang-Mo Koh ◽  
Kurtuluş Günay
Keyword(s):  
Rare Earth ◽  
Rare Earth Elements ◽  
Skarn Deposit ◽  
Metallogenic Belt

scholarly journals Contrasting Depositional Environment of Iron Formation at Endengue Area, NW Congo Craton, Southern Cameroon: New Insights from Trace and Rare Earth Elements Geochemistry

2021 ◽  
Vol 12 (03) ◽  
pp. 280-306
Author(s):  
Robinson Tchatchueng ◽  
Timoléon Ngnotué ◽  
Evine Laure Tanko Njiosseu ◽  
Sylvestre Ganno ◽  
Hervé Wabo ◽  
...  
Keyword(s):  
Rare Earth ◽  
Rare Earth Elements ◽  
Depositional Environment ◽  
Iron Formation ◽  
Southern Cameroon
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