New understandings of Ni–Mo mineralization in early Cambrian black shales of South China: Constraints from variations in organic matter in metallic and non-metallic intervals

Shi, Chunhua; Cao, Jian; Hu, Kai; Bian, Lizeng; Yao, Shuzhen; Zhou, Jie; Han, Shanchu

doi:10.1016/j.oregeorev.2013.12.007

Cited by 21 publications

(6 citation statements)

References 32 publications

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“…a). Therefore, the deposition of MoSC may be much more closely related than the Ni minerals (e.g., millerite) to the presence of organic matter (Shi et al ., ). Pyrite has Sb concentrations that fall between those of MoSC and millerite, and shows little apparently linear trend (Fig.…”

Section: Discussionmentioning

confidence: 97%

Mineralogy of Early Cambrian Ni‐Mo Polymetallic Black Shale at the Sancha Deposit, South China: Implications for Ore Genesis

Han

Cao

et al. 2014

Resource Geology

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The mineralogy of the Early Cambrian Ni-Mo polymetallic black shale ores at the Sancha deposit, South China, was investigated to better the understanding of the complex ore genesis by optical microscope, electron microprobe, and scanning electron microscope. Analytical results show that the sulfides in the ore bed mainly comprise C/MoS2 mixed-layer phase (MoSC), millerite, and pyrite. Of these, MoSC and millerite are the main ore minerals of Mo and Ni, respectively. Pyrite is subdivided into six types based on its morphology, occurrence, relationship to Ni-and Mo-bearing minerals, and chemical composition. Many millerite crystals cut early-formed MoSC, implying that these two minerals formed at different stages. The concentrations of biogenic elements (e.g., Sb) in the MoSC are high compared with those in millerite, implying a close relationship between MoSC and organic matter. These data provide a new and improved understanding of the complex ore genesis at the Sancha deposit, and can be applied to other black-shale-hosted mineral deposits worldwide.

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Section: Discussionmentioning

confidence: 97%

Mineralogy of Early Cambrian Ni‐Mo Polymetallic Black Shale at the Sancha Deposit, South China: Implications for Ore Genesis

Han

Cao

et al. 2014

Resource Geology

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“…Some researchers believe that organisms play an important role in the enrichment of Ni-Mo. Mo shows a high affinity with organic matter, which Ni does not (Pašava et al, 2010;Cao et al, 2013;Shi et al, 2014). Mo in Ni-Mo polymetallic sediments mainly originates from seawater, while Ni comes primarily from hydrothermal activity (Shi et al, 2021).…”

Section: Source Of Sulfur In the Polymetallic Layermentioning

confidence: 99%

“…However, whole-rock Si isotopes, fine mineralogical and sulfur isotope studies have found that the minerals in the polymetallic layers are derived from seawater and hydrothermal fluids (Fan et al, 2013;Han et al, 2020). The total organic carbon (TOC) gradually increased, reached their maximum in the polymetallic layer, then decreased rapidly, with the progress of deposition (Feng et al, 2014;Shi et al, 2014). Organisms contributed to the enrichment of the elements (Shi et al, 2021).…”

Section: Enrichment and Differentiation Between Ni-mo And Vmentioning

confidence: 99%

Sedimentary Environment and Mineralization of the Black Shale Polymetallic Layer in the Early Cambrian, SW China: Constraints from in situ LA‐ICP‐MS Analysis of Pyrite

YANG,

FU,

et al. 2024

Acta Geologica Sinica (Eng)

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A polymetallic layer is usually developed at the bottom of the Early Cambrian black shale in Guizhou province. The mineral that makes up the polymetallic layer is related to the sedimentary facies. To analyze the differentiation mechanism between polymetallic deposits (Ni‐Mo and V), the Zhijin Gezhongwu profile located in the outer shelf and the Sansui Haishan V deposit located in the lower slope are selected to study the in‐situ sulfur isotope and trace elements of pyrite. The results show that δ34S values of pyrite vary widely from −7.8 ‰ to 28 ‰ in the Gezhongwu profile, while the δ34S values are relatively uniform (from 27.8 ‰ to 38.4 ‰) in the Haishan profile. The isotopic S composition is consistent with the transition that occurs in the sedimentary phase from the shelf to the deep sea on the transgressive Yangtze platform; this indicates that the δ34 values in seawater must be differently distributed in depositional environments. The sulfur in the Ni‐Mo layer is produced after the mixing of seawater and hydrothermal fluid, while the V layer mainly originates from seawater. Overall, the Ni‐Mo and V deposits have been differentiated mainly on the basis of the combined effect of continental weathering and hydrothermal fluid.

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“…As a large number of key metals are redox-sensitive, they are easily oxidized during surface processes, subsequently precipitated in reducing waters and then enriched in black shales. For instance, the lower Cambrian Niutitang Formation, found in certain regions of South China, is rich in trace metals, such as nickel, molybdenum, uranium, rhenium and platinum group elements [ 88 ]. In addition, during the subduction of sediments into the mantle, the accumulated metals can be activated and enriched to form key mineral deposits, such as porphyry copper and porphyry molybdenum [ 59 , 89 ].…”

Section: Black Shale Formation and The Evolution Of Earth’s Habitabilitymentioning

confidence: 99%

Organic carbon cycling and black shale deposition: an Earth System Science perspective

Jin,

Wang,

Wang

et al. 2023

National Science Review

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Earth has a prolonged history characterized by substantial cycling of matter and energy between multiple spheres. The production of organic carbon can be traced back to as early as ∼4.0 Ga, but the frequency and scale of organic-rich shales have varied markedly over geological time. In this paper, we discuss the organic carbon cycle and the development of black shale from the perspective of Earth System Science. We propose that black shale depositions are the results of interactions among lithospheric evolution, orbital forcing, weathering, photosynthesis, and degradation. Black shales can record Earth's oxygenation process, provide petroleum and metallic mineral resources, and reveal information about the driver, direction, and magnitude of climate change. Future research on black shales should be expanded to encompass a more extensive and more multi-dimensional perspective.

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New understandings of Ni–Mo mineralization in early Cambrian black shales of South China: Constraints from variations in organic matter in metallic and non-metallic intervals

Cited by 21 publications

References 32 publications

Mineralogy of Early Cambrian Ni‐Mo Polymetallic Black Shale at the Sancha Deposit, South China: Implications for Ore Genesis

Mineralogy of Early Cambrian Ni‐Mo Polymetallic Black Shale at the Sancha Deposit, South China: Implications for Ore Genesis

Sedimentary Environment and Mineralization of the Black Shale Polymetallic Layer in the Early Cambrian, SW China: Constraints from in situ LA‐ICP‐MS Analysis of Pyrite

Organic carbon cycling and black shale deposition: an Earth System Science perspective

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