Uranium Metallogenesis in South China and Its Relationship to Crustal Extension during the Cretaceous to Tertiary

Hu, Ruizhong; Bi, Xian‐Wu; Zhou, Mei‐Fu; Peng, Jiantang; Su, Wenchao; Shen, Liu; Qi, Hua-Wen

doi:10.2113/gsecongeo.103.3.583

Cited by 174 publications

(94 citation statements)

References 38 publications

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“…Subsequently, the Xiaomulan and Chaping granites (167 Ma [14]), the NNE-SSW-trending Xinzi Fault, the NE-SW to NNE-SSW-trending Xinzi grabens, and Cretaceous-Tertiary mafic dikes were produced in response to the tectonic extension in the Yanshanian. CHIME dating of secondary apatite in the Douzhashan granite yields an age of 136 ± 17 Ma, which coincides with the timing of Cretaceous-Tertiary extension in South China (135-140 Ma [5,30,31]). …”

Section: Geochronologymentioning

confidence: 56%

“…Yanshanian tectonism was characterized by collision in the Jurassic and a change to extension in the Cretaceous. The Early Cretaceous (139-143 Ma) marked the period of this tectonic change in South China [5,6,30,31,45]. Magmatism, NNE-SSW-trending faults, and formation of extensional basins accompanied the extensional tectonism.…”

Section: Geochronologymentioning

confidence: 99%

“…These deposits are found mainly in south China, including those at Zhuguangshan and Guidong in northern Guangdong Province, Taoshan in Jiangxi Province, and Miaoershan in northeastern Guangxi. According to the classification of Cuney [1], granite-related U deposits are a form of hydrothermal vein-type U deposit, and associated granites play a key role in the U mineralization [1][2][3][4][5]. Many recent studies have shown that Indosinian S-type granites are closely related to U metallogenesis [6][7][8][9][10].…”

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confidence: 99%

“…Lithospheric extension at this time produced large-scale magmatism, mineralization agent, heat and favorable space that facilitated U mineralization. As such, the Indosinian granites overprinted by the Yanshanian event are potentially important U source rocks in south China [5,6]. However, a number of questions remain about the nature and origins of the U mineralization, including: (1) What minerals were the U sources in the U-rich granites?…”

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Timing of hydrothermal activity associated with the Douzhashan uranium-bearing granite and its significance for uranium mineralization in northeastern Guangxi, China

et al. 2013

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The Miaoershan uranium (U) ore field in northeastern Guangxi is one of the important granite-related U deposits in south China and is closely related to the Douzhashan U-bearing granite. The Douzhashan granite contains primary U-rich accessory minerals, including monazite (UO 2 = 0.98-1.75 wt%) and xenotime (UO 2 = 1.48-6.14 wt%). Primary monazite and xenotime yield chemical ages of 231 ± 28 Ma and 230 ± 38 Ma by electron microprobe analysis and U-Pb isotopic ages of 220±6 Ma and 211±7 Ma by laser ablation-inductively coupled-mass spectrometry respectively. These ages demonstrate that the Douzhashan granite formed during the period of Indosinian magmatic activity. Back scattered electron imaging shows that monazite and xenotime are commonly altered to assemblages of low-U synchisite and apatite, which was associated with loss of U to hydrothermal fluids. U-Th-Pb analyses of secondary apatite yielded a chemical age of 136 ± 17 Ma, which corresponds to the timing of Cretaceous-Tertiary crustal extension in south China. We suggest that the heat and CO 2 required for mineralization was the result of Yanshanian crustal extension, and that this triggered the breakdown of U-rich accessory minerals in the Douzhashan U-bearing granite. Uranium remobilization from the Douzhashan granite provided materials for mineralization within the granite and/or surrounding country rocks. Therefore, a combination of Indosinian compression and Yanshanian extensional overprint produced the hydrothermal U deposits associated with the Douzhashan granite. monazite, xenotime, apatite, dating, Douzhashan U-bearing granite Citation:Hu H, Wang R C, Chen W F, et al. Timing of hydrothermal activity associated with the Douzhashan uranium-bearing granite and its significance for uranium mineralization in

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Section: Geochronologymentioning

confidence: 56%

Section: Geochronologymentioning

confidence: 99%

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confidence: 99%

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confidence: 99%

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Timing of hydrothermal activity associated with the Douzhashan uranium-bearing granite and its significance for uranium mineralization in northeastern Guangxi, China

et al. 2013

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“…Uranium deposits worldwide have been grouped into 15 major categories based on their geologic setting [35,37,50,18]. Some of these deposits which have been explored include: unconformity-type uranium deposit in the Athabasca Basin of Canada [46,2,1], the sandstone-type uranium deposit in the Karoo Basin in South Africa [24], vein-type hydrothermal uranium deposits in South China of Bonako-Sole Areas, Ngondo Complex, Southwestern Cameroon [15], quartz-pebble conglomerate uranium deposits [17], surficial uranium deposits [16], intrusive uranium deposits, volcanic uranium deposits, hematite breccia complex deposits, metamorphic deposits, uranium in black shales, uranium in phosphorites, and uranium in albitites.…”

Section: Introductionmentioning

confidence: 99%

Preliminary Survey for Uranium in Cretaceous Sandstones of Bonako-Sole Areas, Ngondo Complex, Southwestern Cameroon

Tifang¹

2017

EARTH

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Unconformity-type uranium deposits are characterized by mineralization developed along the contact between younger sandstone cover and underlying crystalline basement rocks. Twenty-five sandstone samples were collected at the Ngondo Complex of southwestern Cameroon along the unconformity contact from Bonako through Nyanga to Sole. Petrographic studies on thin sections revealed the presence of sub-rounded to angular quartz grains (80% grains) and ferruginous cement (20% cement). Some quartz grains also showed evidence of deformation. Radioelement concentrations for U, Th and K were determined by gamma-ray spectrometry. The samples showed the various element concentration ranges; 0.0-3.3ppm U, 5.5-11.1ppm Th and 0.1-1.3% K. Variations in the U, Th and K concentration in the sandstone is related to the bedrock geology. The sandstones were also analysed for 21 associated elements using an X-ray fluorescence analyzer. Most of the samples showed moderate concentrations of CaO, Fe 2 O 3 , MgO, TiO 2 , K 2 O, Zr, Sr, Nb, Cr and V. Matrix of Pearson's correlation shows positive correlation between the following; U/Zn; U/Sc, V, Cr; U/Ti; Zn/Nb, Ba, TiO 2 ; Zn/Zr, V/Zn, Rb, Cr, Ba. These reflect the geology of the study area and also suggest the presence of heavy mineral phases like zircon, monazite, rutile.

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Rock magnetic investigation and its geological significance for vein‐type uranium deposits in southern China

Liu

Deng

et al. 2017

Geochem Geophys Geosyst

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To characterize the metallogenic environment of a typical vein‐type uranium deposit, samples from diabase dykes, alteration zones including metamorphic diabase and uranium ore, and granites were systematically investigated for six boreholes from southeastern China. Rock magnetic results indicate that coarse‐grained magnetites (pseudosingle domain, PSD, and multidomain, MD) are dominant magnetic carriers in diabase. In contrast, the uranium ore is dominated by fine‐grained magnetites (superparamagnetic, SP, and single‐domain, SD). The concentration of magnetic particles in fresh granites is low. Magnetic properties of metamorphic diabases exhibit much greater variability of magnetic properties and higher degrees of sulfuration than unaltered diabase and granite, due to contact metasomatism and reduction effects close to the vein. Compared with diabase, magnetic remanence of the uranium ore is much lower, but displays much higher stability. The Koenigsberger ratio Q peaks in the uranium ore with a value of ∼1.00. Using the systematic rock magnetic results to constrain the interpretation, the contribution of the intersection zone of diabase dyke and silicified fault to magnetic anomalies was further modeled, and the effects of the ore body are significant for magnetic exploration. Overall, rock magnetic investigations of vein‐type uranium deposit provide a better understanding of the interactions between different rock types, and further facilitate regional magnetic surveys on the ground.

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Uranium Metallogenesis in South China and Its Relationship to Crustal Extension during the Cretaceous to Tertiary

Cited by 174 publications

References 38 publications

Timing of hydrothermal activity associated with the Douzhashan uranium-bearing granite and its significance for uranium mineralization in northeastern Guangxi, China

Timing of hydrothermal activity associated with the Douzhashan uranium-bearing granite and its significance for uranium mineralization in northeastern Guangxi, China

Preliminary Survey for Uranium in Cretaceous Sandstones of Bonako-Sole Areas, Ngondo Complex, Southwestern Cameroon

Rock magnetic investigation and its geological significance for vein‐type uranium deposits in southern China

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