Evolution of the uranium mineralisation in the Zoujiashan deposit, Xiangshan ore field: Implications for the genesis of volcanic-related hydrothermal U deposits in South China

Bonnetti, Christophe; Liu, Xiaodong; Cuney, Michel; Mercadier, Julien; Riegler, Thomas; Yu, Chi-Da

doi:10.1016/j.oregeorev.2020.103514

Cited by 30 publications

(10 citation statements)

References 69 publications

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“…The radiation-induced destruction of the uraninite structure (i.e., metamictization), as observed in Figure 3e,f, can cause U and Pb depletion and/or enrichment, which may result in significant uncertainties for the U-Pb isotopic ratios [84][85][86][87][88]. Moreover, radiogenic Pb loss due to post-crystallization alteration of uraninite [33] is a common feature that needs to be taken into account for U-Pb isotopic dating as it can lead to the determination of discordant and meaningless ages, and was encountered in various magmatic to hydrothermal U systems [78][79][80].…”

Section: Geochronological Constraint and Comparison With The Previous Ages Of Uraninitementioning

confidence: 99%

“…Minerals 2021, 11, x FOR PEER REVIEW 19 of 27 may result in significant uncertainties for the U-Pb isotopic ratios [84][85][86][87][88]. Moreover, radiogenic Pb loss due to post-crystallization alteration of uraninite [33] is a common feature that needs to be taken into account for U-Pb isotopic dating as it can lead to the determination of discordant and meaningless ages, and was encountered in various magmatic to hydrothermal U systems [78][79][80]. Information regarding the regional metamorphism of the Qinling Group is after [55,83], and the Caledonian magmatic event is after [44,56].…”

Section: Geochronological Constraint and Comparison With The Previous Ages Of Uraninitementioning

confidence: 99%

“…Hence, U/Th ratios (15 to 26) of uraninite from the Guangshigou deposit suggest a magmatic origin. In addition, their Th, REE, and Y enrichments indicate that they most likely crystallized from a fractionated high-K calc-alkaline pegmatitic magma [19,75,[78][79][80]. Indeed, when the high-K calc-alkaline melts become slightly peraluminous and/or when their temperature and Ca content has decreased sufficiently, monazite may become stable and Th-bearing accessory minerals start to fractionate to induce a decrease in Th/U ratios and allow uraninite crystallization [19], which is consistent with cogenetic monazite observed together with uraninite in the Guangshigou deposit (Figure 3c).…”

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confidence: 99%

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SIMS U-Pb Dating of Uraninite from the Guangshigou Uranium Deposit: Constraints on the Paleozoic Pegmatite-Type Uranium Mineralization in North Qinling Orogen, China

et al. 2021

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Pegmatite-type uranium mineralization occurs in the Shangdan domain of the North Qinling Orogenic Belt, representing a significant uraniferous province. The Guangshigou deposit is the largest U deposit of the district. Within the North Qinling area, a series of Caledonian granitic igneous rocks intruded the Proterozoic metamorphic rocks of the Qinling Group in two magmatic stages: (i) the Early Silurian Huichizi granite that was derived from a low degree of partial melting of thickened lower basaltic crust combined with mantle-derived materials following the subduction of the Shangdan Ocean; and (ii) the Late Silurian–Early Devonian Damaogou granite and associated pegmatites derived from the same source but emplaced in a late tectonic post-collisional extension environment. In the Guangshigou deposit, the U mineralization mainly occurs as uraninite disseminated in U-rich granitic biotite pegmatites, which formed by assimilation-fractional crystallization magmatic processes. Petrographic observations showed evidence for coeval crystallization of uraninite and other rock-forming minerals of the host pegmatite including quartz, feldspar, biotite, zircon, monazite, apatite, and xenotime. In addition, the low U/Th ratios (~19) and Th, REE, and Y enrichments characterized a magmatic origin for uraninite, which was likely derived from fractionated high-K calc-alkaline pegmatitic magma that experienced various degrees of crustal material contamination. In situ U-Pb isotopic dating performed by Secondary-Ion Mass Spectrometry (SIMS) on uraninite from the Guangshigou deposit yielded a crystallization age of 412 ± 3 Ma, which is concomitant (within errors) with the emplacement age of the host pegmatite (415 ± 2 Ma) and constrained the U ore genesis to the Early Devonian, which corresponds to the late Caledonian post-collisional extension in the North Qinling area. Uraninite then experienced various degrees of metamictization and/or post-Caledonian hydrothermal alteration characterized by an alteration rim associated with coffinite, chlorite and limonite. Finally, the characteristics of the pegmatite-related Guangshigou deposit exhibiting Th-rich uraninite which was the product of assimilation-fractional crystallization of pegmatitic magma defined a model significantly different than the one established for the world-class Rössing deposit characterized by Th-poor uraninite hosted in alaskite dykes formed by low degree of partial melting of U-rich metasediments.

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Section: Geochronological Constraint and Comparison With The Previous Ages Of Uraninitementioning

confidence: 99%

Section: Geochronological Constraint and Comparison With The Previous Ages Of Uraninitementioning

confidence: 99%

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confidence: 99%

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SIMS U-Pb Dating of Uraninite from the Guangshigou Uranium Deposit: Constraints on the Paleozoic Pegmatite-Type Uranium Mineralization in North Qinling Orogen, China

et al. 2021

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“…A complementary situation is also observed in U ores in Southern China (Bonnetti et al, 2018;Shu et al, 2009;Wang and Shu, 2012). The fluids belonging to the bedrock in the U fields established by the stress tectonic system in Southern China were mobilized after faulting and also deposited in sufficient physicochemical environments (Riegler et al, 2014;Bonnetti et al, 2020).…”

Section: Discussionmentioning

confidence: 82%

Microthermometric characteristics of vein type U-Th enrichment observed in the Fault Zones in Northwest of Arıklı (Çanakkale-Turkey)

Yalçın¹,

Öztürk²,

Kumral³

2021

Gümüşhane Üniversitesi Fen Bilimleri Enstitüsü Dergisi

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U-Th enrichments are observed in many regions in Western Anatolia. There are also U and Th enrichments in the fault zones developed in the tuffs in Arıklı in Biga Peninsula. The characterization of the mineralization is vein type and epigenetic formation. Çetmi Ophiolitic Melange forms the basis of the region. Küçükkuyu formation, which consists of Arıklı tuff member and shale-sandstone member, is located on this unit. The youngest unit in the region is diabase dykes. The study area was affected by deformations during the Paleogene period and E-W and NE-SW extended dip slip fault systems were developed. In the fault zone around Örencik Tepe, 64-1640 ppm values for U and 302-11813 ppm values for Th were obtained respectively. At the same time, hydrothermal magnesite breccias developed in this fault zone. Because of microthermometric assessments in these breccias associated with mineralization, it was determined that the homogenization temperatures (Th, o C) were between 282-348 o C and the % NaCl salinity equivalents were between 4.2-8.0 respectively. It was identified that the solution system of the liquid inclusions is as H2O-MgCl2-CaCl2 and the density of the liquids is between 0.58-0.74 g/cm 3 .

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“…The measurement of trace element concentrations in pitchblende was performed by laser ablation inductively coupled plasma mass spectrometry (LA-ICPMS; AGILENT 7500) at the GeoRessources Laboratory of the Université de Lorraine-CNRS in Nancy (France). The detailed methodology that was followed for LA-ICP-MS measurements is presented in Bonnetti et al (2020Bonnetti et al ( , 2018a. For each analysis performed on pitchblende, a 32 µm or 16 µm spot size has been used depending on the size of the mineral.…”

Section: Trace Element Measurements By La-icp-msmentioning

confidence: 99%

Genesis of the volcanic-related Be-U-Mo Baiyanghe deposit, West Junggar (NW China), constrained by mineralogical, trace element and U-Pb isotope signatures of the primary U mineralisation

Bonnetti

Liu

Cuney

et al. 2021

Ore Geology Reviews

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Evolution of the uranium mineralisation in the Zoujiashan deposit, Xiangshan ore field: Implications for the genesis of volcanic-related hydrothermal U deposits in South China

Cited by 30 publications

References 69 publications

SIMS U-Pb Dating of Uraninite from the Guangshigou Uranium Deposit: Constraints on the Paleozoic Pegmatite-Type Uranium Mineralization in North Qinling Orogen, China

SIMS U-Pb Dating of Uraninite from the Guangshigou Uranium Deposit: Constraints on the Paleozoic Pegmatite-Type Uranium Mineralization in North Qinling Orogen, China

Microthermometric characteristics of vein type U-Th enrichment observed in the Fault Zones in Northwest of Arıklı (Çanakkale-Turkey)

Genesis of the volcanic-related Be-U-Mo Baiyanghe deposit, West Junggar (NW China), constrained by mineralogical, trace element and U-Pb isotope signatures of the primary U mineralisation

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