Facies dependence of the mineralogy and geochemistry of altered volcanic ash beds: An example from Permian-Triassic transition strata in southwestern China

Hong, Hanlie; Algeo, Thomas J.; Fang, Qian; Zhao, Lulu; Ji, Kaipeng; Yin, Kunlong; Wang, Chaowen; Cheng, Shi

doi:10.1016/j.earscirev.2018.12.007

Cited by 53 publications

(34 citation statements)

References 177 publications

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“…In addition to the occurrences of extensive wildfires, prevalent drought climate conditions (Shen et al, 2011;Zhang et al, 2016) and a series of volcanisms (Fang et al, 2017;Xu et al, 2017;Hong et al, 2019) were previously documented in Southwest China during the latest Permian. Therefore, the rainforest ecosystems formed by the Gigantopteris flora could be severely affected.…”

Section: The Turnover Of Vegetationmentioning

confidence: 99%

“…Our data indicate that volcanism was likely the primary cause of the sudden NCIE in the Lengqinggou section, for a 4.08‰ negative excursion occurred just below (−24.26‰) and above (−28.34‰) the ash bed in the last coal. Extensive volcanism was coincident with the EPME (Erwin, 1994;Jin et al, 2000), and the PTB sequences in southwestern China contain numerous ash beds (Fang et al, 2017;Xu et al, 2017;Hong et al, 2019). According to trace elements and Hf-isotope analyses, these ash beds were mainly deposited locally around the Tethys region (Wang et al, 2019).…”

Section: δ 13 C Org Excursion and Volcanismmentioning

confidence: 99%

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Intensive Wildfire Associated With Volcanism Promoted the Vegetation Changeover in Southwest China During the Permian−Triassic Transition

et al. 2021

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Palaeo-wildfire, which had an important impact on the end Permian terrestrial ecosystems, became more intense in the latest Permian globally, evidenced by extensive occurrence of fossil charcoals. In this study, we report abundant charcoals from the upper part of the Xuanwei Formation and the Permian–Triassic transitional Kayitou Formation in the Lengqinggou section, western Guizhou Province, Southwest China. These charcoals are well-preserved with anatomical structures and can be classified into seven distinctive types according to their characteristics. Organic carbon isotopic analyses of both bulk rocks and charcoals show that the δ13Corg values in the Kayitou Formation are notably more negative than those in the Xuanwei Formation, with a negative excursion of 4.08‰ immediately above the volcanic ash bed in the middle of the uppermost coal bed of the Xuanwei Formation. Charcoals with high reflectance values (Romean = 2.38%) are discovered below the ash bed. By contrast, the reflectance values (Romean = 1.51%) of the charcoals in the Kayitou Formation are much lower than those of the Xuanwei Formation, indicating the palaeo-wildfire types have changed from crown fires to surface fires, which was probably due to the retrogression of vegetation systems during the extinction. Based on the above evidence, we suppose that palaeo-wildfires became more frequent and more severe since the climate became drier during the latest Permian in Southwest China, and the eventual vegetation changeover of the terrestrial ecosystems in Southwest China could be caused by volcanism.

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Section: The Turnover Of Vegetationmentioning

confidence: 99%

Section: δ 13 C Org Excursion and Volcanismmentioning

confidence: 99%

Intensive Wildfire Associated With Volcanism Promoted the Vegetation Changeover in Southwest China During the Permian−Triassic Transition

et al. 2021

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“…and IS R1 are considered as authigenic clay minerals formed from glassy ash shard deposits that likely correspond to tuffs, as frequently observed for tonsteins and Kbentonites (Spears, 2012;Huff, 2016;Hong et al, 2019). By contrast, mixtures of micaillite, chlorite, kaolinite, vermiculite and associated mixed-layers (illite-smectite, chlorite-…”

Section: Accepted Manuscriptmentioning

confidence: 99%

Sedimentology and U-Pb dating of Carboniferous to Permian continental series of the northern Massif Central (France): Local palaeogeographic evolution and larger scale correlations

Ducassou

Mercuzot

Bourquin

et al. 2019

Palaeogeography, Palaeoclimatology, Palaeoecology

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“…The results for sample S-1 show that the contents of SiO 2 , MgO (4.18%) and K 2 O (10.04%) are higher while the Al 2 O 3 content (12.41%) is lower than the values reported for the post-Archean Australian shale (PAAS) and north American shale composite (NASC) [28]. The K 2 O contents of the ash samples are largely dependent on the presence of I/S and illite, since K is usually fixed in the interlayer sites of illite [29]. The illite typically contains 7% K 2 O, and the K 2 O content of the ash sample will increase with increased proportion of illite layers in the mixed-layer I/S clays [30][31][32].…”

Section: Elemental Geochemistrymentioning

confidence: 79%

Mineralogical and Geochemical Characteristics of Triassic Lithium-Rich K-Bentonite Deposits in Xiejiacao Section, South China

et al. 2020

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Widespread alteration in the Early–Middle Triassic volcanic ash of the Xiejiacao section, south China, has resulted in significant occurrences of lithium-rich K-bentonite deposits with economic potential. Detailed mineralogical and geochemical investigations of Li-rich K-bentonite deposits from the Xiejiacao section of Guangan city, South China, are presented here. The X-ray diffraction (XRD) data and major element chemistry indicates that the Li-rich K-bentonite deposits contain quartz, clay minerals, feldspar, calcite and dolomite, and the clay minerals are dominated by illite and ordered (R3) illite/smectite (I/S). The concentrations of major and trace elements in Li-rich K-bentonite deposits altered from volcanic ashes are most likely derived from felsic magmas, associated with intense volcanic arc activity. The composition of the clay components suggests that the Li-rich K-bentonite deposits are probably altered from the smectite during diagenesis, whereas smectite is mainly formed by submarine alterations of volcanic materials and subsequently the I/S derived from the volcanogenic smectite illitization. Moreover, accurate determination of the structure in I/S reveals that the temperatures reached by the sedimentary series are around 180 °C with a burial depth of ~6000 m. The widely distributed lithium-rich clay deposits strongly indicate widespread eruptions of volcanic ashes in the Early–Middle Triassic, which released huge amounts of volcanic ash. Lithium fixed in the illite and I/S is considered to have leached from the volcanogenic products by a mixed fluid source (i.e., meteoric, porewater and hydrothermal fluids). These Li-rich clay minerals in the marine basin contain economically extractable levels of metal and are a promising new target for lithium exploration.

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Facies dependence of the mineralogy and geochemistry of altered volcanic ash beds: An example from Permian-Triassic transition strata in southwestern China

Cited by 53 publications

References 177 publications

Intensive Wildfire Associated With Volcanism Promoted the Vegetation Changeover in Southwest China During the Permian−Triassic Transition

Intensive Wildfire Associated With Volcanism Promoted the Vegetation Changeover in Southwest China During the Permian−Triassic Transition

Sedimentology and U-Pb dating of Carboniferous to Permian continental series of the northern Massif Central (France): Local palaeogeographic evolution and larger scale correlations

Mineralogical and Geochemical Characteristics of Triassic Lithium-Rich K-Bentonite Deposits in Xiejiacao Section, South China

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