Geochemical characteristics of coal mine discharge vis-à-vis behavior of rare earth elements at Jaintia Hills coalfield, northeastern India

AbstractGeochemical characteristics and rare-earth element (REE)-bearing minerals of calc-alkaline granites in southern Myanmar were investigated to identify the minerals controlling fractionation between light and heavyREE(LREE and HREE) during magmatic differentiation and weathering. The granites were classified on the basis of the mineral assemblages into two contrasting groups: allanite-(Ce)- and/or titanite-bearing granites; and more HREE-enriched granites characterized by hydrothermal minerals including synchysite(Y), parisite-(Ce), bastnäsite-(Ce), xenotime-(Y), monazite-(Ce), Y-Ca silicate, waimirite-(Y) and fluorite. This suggests that allanite-(Ce) and titanite are not stable in differentiated magma and HREE are eventually preferentially incorporated into the hydrothermal minerals. The occurrence of theREE-bearing minerals is constrained by the degree of magmatic differentiation and the boundary of two contrasting granite groups is indicated by SiO2contents of ∼74 wt.% or Rb/Sr ratios of ∼3–8. Fractionation between LREE and HREE during weathering of the granites is influenced by weathering resistance of theREE-bearing minerals, i.e. allanite-(Ce), titanite, theREEfluorocarbonates and waimirite-(Y) are probably more susceptible to weathering, whereas zircon, monazite-(Ce) and xenotime-(Y) are resistant to weathering. Ion-exchangeableREEin weathered granites tend to be depleted in HREE relative to the whole-rock compositions, suggesting that HREE are more strongly adsorbed on weathering products or that HREE remain in residual minerals.

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Geochemical Characteristics of Rare Earth Elements in Petroleum and Their Responses to Mantle-Derived Fluid: An Example from the Dongying Depression, East China

Energy Exploration & Exploitation ◽

10.1260/014459809788708200 ◽

2009 ◽

Vol 27 (1) ◽

pp. 47-68 ◽

Cited By ~ 17

Author(s):

Liuping Zhang ◽

Yingquan Zhao ◽

Zhijun Jin ◽

Guoping Bai ◽

Lei Yang

Keyword(s):

Rare Earth ◽

Rare Earth Elements ◽

Geochemical Characteristics ◽

East China ◽

Dongying Depression

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RECOVERY OF RARE EARTH ELEMENTS (REES) FROM COAL MINE DRAINAGE SLUDGE LEACHATE

10.33915/etd.7454 ◽

2019 ◽

Author(s):

Panpan Ren

Keyword(s):

Rare Earth ◽

Rare Earth Elements ◽

Coal Mine ◽

Mine Drainage ◽

Coal Mine Drainage ◽

Coal Mine Drainage Sludge

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Mineralogical and Geochemical Characteristics of Lithium and Rare Earth Elements in High-Sulfur Coal from the Donggou Mine, Chongqing, Southwestern China

Minerals ◽

10.3390/min10070627 ◽

2020 ◽

Vol 10 (7) ◽

pp. 627

Author(s):

Jianhua Zou ◽

Longfei Cheng ◽

Yuanchen Guo ◽

Zhengcheng Wang ◽

Heming Tian ◽

...

Keyword(s):

Rare Earth ◽

Rare Earth Elements ◽

Raw Materials ◽

Geochemical Characteristics ◽

Critical Elements ◽

Geological Factors ◽

Potential Alternative ◽

Geological Factor ◽

Alternative Sources ◽

Coal Measures

Coal and coal by-products are considered as the potential raw materials for critical elements (e.g., rare earth elements, Li, Ga, Ge, etc.), which have attracted much attention in recent years. The purpose of this study is to investigate the mineralogical and geochemical characteristics, and controlling geological factors of lithium and rare earth elements in the Lopingian (Wujiaping Formation) coal from the Donggou Mine, southeastern Chongqing Coalfield, China. Results indicate that lithium and rare earth elements are significantly enriched in the Donggou coals, which could be new potential alternative sources for critical elements. Concentrations of lithium and rare earth elements in the Donggou coals gradually increase from top to bottom. Lithium is mainly associated with kaolinite, while rhabdophane, florencite, goyazite, and xenotime are the main hosts of rare earth elements. The controlling geological factor is the groundwater leaching of underlying tuff, and to a lesser extent, the terrigenous clastic materials input from the top layer of the Kangdian Upland. This study provides mineralization information for lithium and rare earth elements exploration in coal measures.

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

Interpretation ◽

10.1190/int-2019-0158.1 ◽

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.

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