Volcanic and hydrothermal activities recorded in phosphate nodules from the Lower Cambrian Niutitang Formation black shales in South China

Gao, Ping; He, Zhiliang; Li, Shuangjian; Lash, Gary G.; Li, Boyuan; Huang, Boyu; Yan, Detian

doi:10.1016/j.palaeo.2018.06.019

Cited by 81 publications

(33 citation statements)

References 75 publications

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“…Redox sensitive elements (RSE), such as molybdenum (Mo), uranium (U), and vanadium (V), are widely used to reflect the palaeoredox condition during deposition (Gao et al, ). The average concentration of Mo, V, and U are 46.35, 206.53, and 26.37 ppm, respectively (Table ).…”

Section: Resultsmentioning

confidence: 99%

“…For example, the pre‐explosive crustal uplift of the Emeishan Large Igneous Province during the Middle Permian in South China may have promoted oceanic primary productivity (Shi, Feng, Shen, Ito, & Chen, ). The large amount of nutrients including phosphate and nitrogen released from volcanic and hydrothermal activities results in the bloom of plankton and then enhanced the palaeoproductivity leading to organic matter enrichment (Gao et al, ).…”

Section: Introductionmentioning

confidence: 99%

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Main factors controlling the organic matter enrichment in the Lower Cambrian sediments of the Sichuan Basin, SW China

Wang

Tian

et al. 2019

Geological Journal

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The Lower Cambrian Qiongzhusi Formation contains more than 200 m of marine sediments mainly consisting of mudstone and black shales, which are widely accepted as the most important hydrocarbon source rocks of the Ediacaran–Cambrian giant gas field in the Sichuan Basin. The geochemical compositions of biomarkers and trace elements obtained from black shales at the bottom of the Qiongzhusi Formation were used to reconstruct the palaeoproductivity and palaeoenvironment and to determine the main factors controlling the deposition and preservation of this organic‐rich shales. Based on varieties of steroids and hopanoids compositions, multifarious palaeobios such as pelagophyceae, dinoflagellate, diatom (or its ancestor), sponges, and aerobic/anaerobic bacteria have been proved to evolve in the Early Cambrian in the Sichuan Basin. In addition, a relative high concentration of Cubio compared with modern oceanic palaeoproductivity proxies indicate a moderate to relatively high palaeoproductivity, which is favourable for the organic matter accumulation of this source rocks. Moreover, the evidence from biomarkers and trace element ratios suggest that the Lower Cambrian sediments were deposited under a non‐sulphurized anoxic condition, which provided a favourable preservation condition. The covariation among Porg, Cubio, and TOC shows that the palaeoproductivity is the main controlling factor for the high organic content of the black shales of the Qiongzhusi Formation.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Main factors controlling the organic matter enrichment in the Lower Cambrian sediments of the Sichuan Basin, SW China

Wang

Tian

et al. 2019

Geological Journal

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“…Based on the abundant hyalophane-quartz and white mica, which indicates volcanic activity, the development of the Shuram Formation is probably influenced by submarine volcanism. The volcaniclastics were introduced in the formation by hydrothermal fluid flow [48].…”

Section: Shuram Formationmentioning

confidence: 99%

Neoproterozoic Nafun Group Sediments from Oman Affected by an Active Continental Margin

Liang

Vandeginste

2020

Minerals

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The Neoproterozoic era is a time of major environmental change in Earth history. The Ediacaran period (635–541 Ma), the uppermost division of Precambrian time, is characterized by the remarkable Shuram excursion (largest C isotope negative excursion), a deep ocean water oxidation event, and Ediacaran biota. The Nafun Group of Oman provides a well-preserved and mostly continuous section of an Ediacaran succession. Based on geochemical data from the Nafun Group, the Shuram excursion (SE) and deep ocean oxidation hypotheses were proposed. Now, we sampled this section at high stratigraphic resolution, and present here the petrographical and geochemical analysis of the Khufai, Shuram and Buah Formations. The major and trace element analysis of shales from the Shuram Formation indicates that northern Oman was an active continental margin environment in Neoproterozoic times. The provenance of the Shuram Formation was primarily mafic and intermediate igneous rocks. With the unsteady tectonic setting, the development of the Nafun Group was influenced by hydrothermal supply and volcaniclastic input. Based on the V/Cr and U/Th ratio of the samples from the Nafun Group, our study reveals the transition of the ocean water redox environment, which is connected to the rise and fall of the Ediacaran biota. Our study constrains the tectonic setting of northern Oman and the petrography and geochemical data from the Nafun Group for the hydrothermal and volcaniclastic supply. Thus, our study acknowledges more factors for the explanation of the Ediacaran conundrums.

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“…Thin section of phosphorite samples were prepared and investigate by optical microscopy [22,23]. An Olympus CX21 polarizing microscope was used to investigate the mineral characteristics and textural relationships of phosphorite.…”

Section: Optical Microscopymentioning

confidence: 99%

“…As shown in Table 1, the primary and weathered ores are enriched in Ba, Ce, La, Nd, Sr, and Y, and depleted in Co and Ni. Gallium, a chalcophile element related to hydrothermal activity [22], was enriched in the weathered ore and gradually depleted with the increase in temperature. Chromium, a siderophile element mainly found in ultrabasic and basic rocks, was also enriched in the weathered ore and mainly found in basic rocks and ultrabasic rocks.…”

Section: Comparison Of Trace Elementsmentioning

confidence: 99%

Geochemical Characteristics of Dolomitic Phosphorite Containing Rare Earth Elements and Its Weathered Ore

Zhang

Wang

et al. 2019

Minerals

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In order to provide a good theoretical guidance for the development and utilization of weathered phosphorite resources, we investigated the geochemical and mineralogical characteristics of primary and weathered phosphorites. The analysis of trace elements showed that the primary ore has hydrothermal sedimentation effect in the later stage, the weathered ore has obvious residual enrichment and the phosphate ore belongs to clastic lithologic phosphate rock. In addition, through leaching test method, it was shown that rare earth elements are present in fluorapatite in the form of isomorphic substitution, and the proportion of rare earth elements adsorbed on clay and other minerals was likely to be between 2% and 3%. The light rare earth elements are relatively enriched in both primary and weathered phosphorite, and Ce and Eu have obvious negative anomalies. The primary phosphorite is a dolomitic phosphorite containing rare earth elements, which are naturally enriched by weathering, and its weathered ore has obvious residual enrichment, while the deposit was characterized by normal marine sedimentation and hydrothermal action.

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Volcanic and hydrothermal activities recorded in phosphate nodules from the Lower Cambrian Niutitang Formation black shales in South China

Cited by 81 publications

References 75 publications

Main factors controlling the organic matter enrichment in the Lower Cambrian sediments of the Sichuan Basin, SW China

Main factors controlling the organic matter enrichment in the Lower Cambrian sediments of the Sichuan Basin, SW China

Neoproterozoic Nafun Group Sediments from Oman Affected by an Active Continental Margin

Geochemical Characteristics of Dolomitic Phosphorite Containing Rare Earth Elements and Its Weathered Ore

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