A model for Nb–Zr–REE–Ga enrichment in Lopingian altered alkaline volcanic ashes: Key evidence of H-O isotopes

Dai, Shifeng; Nechaev, Victor P.; Chekryzhov, I. Yu.; Zhao, Lixin; Vysotskiy, S. V.; Graham, Ian T.; Ward, Colin R.; Ignatiev, A. V.; Velivetskaya, T. A.; Zhao, Laishi; French, David; Hower, James C.

doi:10.1016/j.lithos.2018.01.005

Cited by 74 publications

(17 citation statements)

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“…However, the characteristics and alteration mechanism of hydrothermal solution are not clear. Recently, Dai et al illustrate the hydrothermal solution compositions, nature and mineralization of the alkali volcanic ash in Yunnan Province (southwestern China) based on the analysis of H-O isotope and petrological, mineralogical and geochemical assemblages [92]. Firstly, the alkali volcanic ash was leached by the mixed high-temperature hydrothermal solution (including acidic waters and CO 2 degassing from the Emeishan Plume) and resulted in the in situ enrichment of Al, Ti and the depletion of Nb, Zr, Ga and REY [92].…”

Section: Injection Of Low-temperature Hydrothermal Fluidsmentioning

confidence: 99%

“…Recently, Dai et al illustrate the hydrothermal solution compositions, nature and mineralization of the alkali volcanic ash in Yunnan Province (southwestern China) based on the analysis of H-O isotope and petrological, mineralogical and geochemical assemblages [92]. Firstly, the alkali volcanic ash was leached by the mixed high-temperature hydrothermal solution (including acidic waters and CO 2 degassing from the Emeishan Plume) and resulted in the in situ enrichment of Al, Ti and the depletion of Nb, Zr, Ga and REY [92]. Secondly, the leached Nb, Zr, Ga and REY were precipitated under the environment of cooler, neutral or alkaline hydrothermal fluid alteration [92], and in some cases, with injection of sea water [93].…”

Section: Injection Of Low-temperature Hydrothermal Fluidsmentioning

confidence: 99%

“…Firstly, the alkali volcanic ash was leached by the mixed high-temperature hydrothermal solution (including acidic waters and CO 2 degassing from the Emeishan Plume) and resulted in the in situ enrichment of Al, Ti and the depletion of Nb, Zr, Ga and REY [92]. Secondly, the leached Nb, Zr, Ga and REY were precipitated under the environment of cooler, neutral or alkaline hydrothermal fluid alteration [92], and in some cases, with injection of sea water [93].…”

Section: Injection Of Low-temperature Hydrothermal Fluidsmentioning

confidence: 99%

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Mineralogical and Geochemical Compositions of the Lopingian Coals in the Zhongliangshan Coalfield, Southwestern China

et al. 2018

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Abstract:The mineralogical and geochemical compositions of the Lopingian coals from an exploratory drill core (ZK4-1) in the Zhongliangshan Coalfield, southwestern China are reported in this paper. The Zhongliangshan coals are medium volatile bituminous in rank (random vitrinite reflectance, average 1.38%), characterized by a medium-ash yield (26.84%) and high sulfur content (3.38%). Minerals in the Zhongliangshan coals are mainly composed of clay assemblages (kaolinite, the illite/smectite mixed layer (I/S) and chamosite), pyrite, quartz, carbonate minerals (calcite, marcasite, ankerite, and dolomite), and anatase, followed by rutile, jarosite, natrojarosite, bassanite, gypsum and K-feldspar, with traces of apatite, rhabdophane and barite. Compared with the average concentrations of the world hard coals, some trace elements including Li, V, Co, Cu, Se, Y, Zr, Nb, rare earth elements (REE), Cd, Ta, Hf and Hg, are enriched in the Zhongliangshan coals. The modes of occurrence of chamosite, barite, rhabdophane, quartz and calcite in the Zhongliangshan coals indicate that the coals have probably been affected by the injection of low-temperature hydrothermal fluids. Based on the concentrations of Sc, V, Cr, Co, Ni, Cu and Zn, the ratios of Al 2 O 3 /TiO 2 and the upper continental crust-normalized rare earth element and yttrium (REY) distribution patterns of the Zhongliangshan coals, the dominant sediment source regions are the Leshan-Longnvsi Uplift, Hannan Upland, and Dabashan Uplift, with a small proportion of terrigenous materials from the Kangdian Upland. The K7 and the upper portion of K1 coals have the potential as raw materials for the recovery of REY.

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Section: Injection Of Low-temperature Hydrothermal Fluidsmentioning

confidence: 99%

Section: Injection Of Low-temperature Hydrothermal Fluidsmentioning

confidence: 99%

Section: Injection Of Low-temperature Hydrothermal Fluidsmentioning

confidence: 99%

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Mineralogical and Geochemical Compositions of the Lopingian Coals in the Zhongliangshan Coalfield, Southwestern China

et al. 2018

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“…Zhao et al [29] pointed out that the Nb-Zr-REE-Ga mineralization in southwestern China was caused by the interaction with alkaline volcanic ashes and the subsequent percolation of low-temperature fluids. Dai et al [30] further proposed that these volcanic ashes originated from alkaline magmatism, which was followed by a continuous hydrothermal-weathering process. The hydrothermal solutions were sourced from acidic rains mixed with the CO 2 produced by the degassing of the Emeishan plume.…”

Section: Introductionmentioning

confidence: 99%

“…According to Dai et al [23] and Ward [61], volcanic ash affects the trace element concentrations of coal in two ways: (1) Intra-seam tonsteins, widely distributed in the Late Permian coals of southwestern China, may be incorporated with mined coal products, and if not removed in the preparation plant, become part of the feed coal; and (2) Similar volcanic ash that forms tonstein bands intimately dispersed in the peat, and during diagenesis the originally pyroclastic matter becomes part of the inherent mineral matter in the coal seam. Although the mechanism by which alkaline volcanic ash causes enrichments in Nb, Ta, Zr, Hf, REE, and Ga has been adequately explained by Dai et al [30], the mechanism by which intermediate-felsic volcanic ash causes elemental enrichments is still unclear. Since the intermediate-felsic volcanic ash that falls from the sky are enriched in Ga and Li [79], later leaching by ground water or hydrothermal solutions could transport elements, such as Ga and Li, from the volcanic ash into the coal seam, resulting in the enrichment of Ga and Li in the No.…”

mentioning

confidence: 99%

Mineralogy and Geochemistry of the No. 5−2 High-Sulfur Coal from the Dongpo Mine, Weibei Coalfield, Shaanxi, North China, with Emphasis on Anomalies of Gallium and Lithium

et al. 2019

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This paper reports the mineral compositions and geochemical characteristics of the No. 5-2 high-sulfur coal (Taiyuan Formation) from Dongpo Mine, Weibei Coalfield, Shaanxi, Northern China via transmitted and reflected light microscopy, scanning electron microscope equipped with an energy-dispersive X-ray spectrometer (SEM-EDS), X-ray diffraction (XRD), inductively coupled plasma mass spectrometry (ICP-MS), and X-ray fluorescence spectrometry (XRF). We also confirmed the input of intermediate-felsic volcanic ashes into the Taiyuan Formation coals in Dongpo Mine, Weibei Coalfield. The results show that Dongpo coals are enriched in Ga and Li compared to the average values for world hard coals, and they are depleted in Al2O3 compared to Chinese coals. The coal low temperature ash contains kaolinite, illite, quartz, calcite, pyrite, and to a lesser extent, chlorite, plagioclase, dolomite, ankerite, and apatite. The concentration anomalies of Ga and Li in No. 5-2 high-sulfur coal were not caused by the Benxi Formation Bauxite, but by the influence of multiple geological factors. The Middle Proterozoic moyite from the Yinshan Oldland led to the slightly higher Ga and Li contents of the No. 5-2 coal than those in world hard coals. Input of synchronization volcanic ash, injection of hydrothermal fluids during the syngenetic or early diagenetic stages and influence of seawater further contributed to the Ga and Li enrichment of the No. 5-2 coal.

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Volcanic activity during the Early–Middle Triassic transition in the Sichuan Basin, South China: Duration, evolution and implications

Li,

Chen,

Lang

et al. 2024

Geological Journal

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The felsic volcanogenic tuff known as ‘green bean rock’ (GBR) and its carbonates are widely dispersed across the western Yangtze Block. This study investigates the origin, tectonic setting and genesis of GBR, as well as the environmental disruptions evident in carbonates from the western edge of the Yangtze Block. The analyses include mineralogy, whole‐rock geochemistry and the isotopic composition of zircon Hf, carbon and oxygen in GBR samples from the western edge of the Yangtze Block. The geochemical profile of GBR shows enriched LREE, Th and U content, depleted levels of Nb, Ta, Sr, Ba, K, Rb and Ti, and strong‐to‐moderate negative Eu anomalies (δEu = 0.15–0.18). Zircon Hf isotopes exhibit S‐type geochemical affinities with low negative εHf(t) values (−13.3 to −5.7) and TDM2 ages of 1684–2110 Ma. This suggests that the volcanic ashes originate from the magma of an intermediate to felsic composition. X‐ray directionality data show that the most prevalent clay minerals are illite and illite/smectite. Lithium fixed in these minerals is likely to have leached from brine. Early Triassic variances in δ13C profiles are reliable indicators of environmental disturbances, pointing to cycles of devastation and restoration in marine ecosystems, interspersed with extraneous events including volcanic activity. The study posits that volcano eruptions may have prolonged biotic recovery after the end‐Permian mass extinction.

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A model for Nb–Zr–REE–Ga enrichment in Lopingian altered alkaline volcanic ashes: Key evidence of H-O isotopes

Cited by 74 publications

References 44 publications

Mineralogical and Geochemical Compositions of the Lopingian Coals in the Zhongliangshan Coalfield, Southwestern China

Mineralogical and Geochemical Compositions of the Lopingian Coals in the Zhongliangshan Coalfield, Southwestern China

Mineralogy and Geochemistry of the No. 5−2 High-Sulfur Coal from the Dongpo Mine, Weibei Coalfield, Shaanxi, North China, with Emphasis on Anomalies of Gallium and Lithium

Volcanic activity during the Early–Middle Triassic transition in the Sichuan Basin, South China: Duration, evolution and implications

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