Geochemical Characteristics of Rare, Dispersed, and Rare Earth Elements in the Middle Jurassic Yan'an Formation of the Ningdong Coalfield and Their Indication for a Sedimentary Environment

HE Wei; WU Liang; WEI Xiangcheng; TAO Rui; SONG Yang

doi:10.15898/j.cnki.11-2131/td.202111080169

Rock and Mineral Analysis > 2022 > 41(6): 962-977. > DOI: 10.15898/j.cnki.11-2131/td.202111080169

HE Wei, WU Liang, WEI Xiangcheng, TAO Rui, SONG Yang. Geochemical Characteristics of Rare, Dispersed, and Rare Earth Elements in the Middle Jurassic Yan'an Formation of the Ningdong Coalfield and Their Indication for a Sedimentary Environment[J]. Rock and Mineral Analysis, 2022, 41(6): 962-977. DOI: 10.15898/j.cnki.11-2131/td.202111080169

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Geochemical Characteristics of Rare, Dispersed, and Rare Earth Elements in the Middle Jurassic Yan'an Formation of the Ningdong Coalfield and Their Indication for a Sedimentary Environment

HE Wei^{1, 2,},
WU Liang^{1, 2, ,},
WEI Xiangcheng^{1, 2},
TAO Rui^{1, 2},
SONG Yang^{1, 2}

1.
Ningxia Mineral Geological Survey Institute, Yinchuan 750021, China
2.
Ningxia Mineral Geology Research Institute, Yinchuan 750021, China

More Information

Received Date: November 07, 2021
Revised Date: February 14, 2022
Accepted Date: March 22, 2022
Available Online: December 13, 2022

Abstract

HIGHLIGHTS
(1) The contents of rare, dispersed, and rare earth elements in the Yan’an Formation of Ningdong Coalfield are low, which does not meet the requirements of industrial indicators of the deposit and cannot be exploited comprehensively.

(2) The Rb/Sr ratio, (La/Yb)_N, and REY (REEs+yttium) are relatively high, and δEu is negative. The average ancient water temperature is 29.90℃. The Ce anomaly and the Ce/La ratio are -0.05 and 1.92, respectively, indicating that the climate of the Yan’an Formation is warm and humid during deposition, and it is a fresh water deposition and reduction environment with hypoxia.

(3) The sample Eu has a negative anomaly, Ce has no obvious anomaly, LREY is enriched, the provenance is mainly from the upper crust, mixed with alkaline basalt and granite. It is inferred that magmatic rocks and metamorphic rocks in Helanshan area are the main source areas of the Yan’an Formation.

ABSTRACT

BACKGROUND
Rare, dispersed, and rare earth elements are important strategic resources because of their special performance and function. At the same time, because of its unique geochemical properties, it is of great significance in the study of paleoclimate, paleo-water and paleo-sedimentary environment, and sediment sources. Previous studies have found that Ga in the Ningdong Coalfield is slightly enriched and rare earth element content is low.
OBJECTIVES
To explore the possibility of enrichment and mineralization of rare, dispersed, and rare earth elements in the coal series of the Yan'an Formation of Middle Jurassic in the Ningdong Coalfield, and discuss the characteristics of paleosedimentary environment and properties of provenance rock.
METHODS
Systematic sampling was carried out in the core of boreholes from the Lingwu and Jijiajing mining areas of the Ningdong Coalfield. ICP-MS was used to determine the content of rare, dispersed, and rare earth elements in mudstone, sandstone and top (bottom) plate of the Yan'an Formation.
RESULTS
The overall content of rare, dispersed, and rare earth elements in the Yan'an Formation of the Ningdong Coalfield is low, which do not meet the requirements of the industrial indicators of the deposit and cannot be exploited comprehensively. The highest content of Ga is 29.40μg/g, which is close to the lowest industrial grade of 30.00μg/g. Compared with the average content of elements in world coal, rare elements Li, Nb, Ta, Rb, Cs, Zr and dispersed elements Ga, In, Sc, Hf are slightly enriched or enriched. The distribution of rare earth elements shows LREY type, and significant negative anomaly of Eu.
CONCLUSIONS
Rb, Sr and REY indicate the humidity of paleoclimate conditions, Li, Sr and Ga represent the freshwater deposition environment, and Ce, Ce/La reflect the anoxic reducing environment. The REY content is not affected by diagenesis and can be used to discriminate the original sediment source.

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References (43)

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Geochemical Characteristics of Rare, Dispersed, and Rare Earth Elements in the Middle Jurassic Yan'an Formation of the Ningdong Coalfield and Their Indication for a Sedimentary Environment

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