Multiple episodes of tectono-thermal disturbances in the Huayangchuan U-Nb-Pb polymetallic deposit in the Xiaoqinling region, central China and their significances on metallogeny

Cai, Jianjun; Yu, Liangliang; Xu, Deru; Gao, Cheng; Chen, Genwen; Yu, De‐Quan; Jiao, Qianqian; Ye, Tingwei; Zou, Shaohao; Li, Lirong

doi:10.1016/j.oregeorev.2020.103755

Cited by 10 publications

(12 citation statements)

References 118 publications

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“…2021) and even in the Qinling orogen (Cai et al . 2020). Therefore, it seems that a prevailing E–W extension dominated the eastern China continent at the time.…”

Section: Discussionmentioning

confidence: 99%

Mafic to felsic dyke swarms in coastal Guangdong, China: geochemical and geochronological constraints on the latest Mesozoic geodynamics on the southern margin of the South China Block

Cai

Wu²,

Han³

2022

Geol. Mag.

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The coastal region of Guangdong Province, China, is characterized by well-developed dyke swarms. The dykes with widths of decimetres to metres and lengths of tens of metres occur along straight and planar fractures cutting granites or volcanic rocks with Jurassic to Early Cretaceous ages. They show steep attitudes with strikes varying from NNW to NNE and from NE to SE, consistent with a stress regime transition from E–W to N–S extension. Major-element analysis on representative dyke samples reveals a composition range from basaltic to andesitic with a few dacitic outliers. Trace elements of most samples show notable Nb–Ta negative anomalies and Pb positive anomalies on the primitive mantle normalized spidergrams, characteristic of arc-related rocks. Among these, several dacite samples show notable fractionated medium rare earth elements and heavy rare earth elements and high Sr/Y (47–74) and La/Yb (15–21) ratios indicative of adakitic affinity. A few samples lack anomalies in Nb and Ta and have primitive trace-element ratios (e.g. Nb/La and Sr/Nd) or initial ϵNd values resembling ocean island basalt-like rocks. Rare earth element distribution patterns of all samples are right inclined and generally absent of Eu anomalies, which together with other trace-element indexes indicate an origin from heterogeneous mantle sources with depths below the stability field of plagioclase. Radiogenic isotopes, especially those of Nd and Sr (or Nd–Pb), define an array extended from the depleted to enriched mantle (EMII) provenance. LA-ICP-MS dating of zircon obtains ages between 110 and 70 Ma indicating emplacement of these dykes in latest Early to Late Cretaceous time, a time just before initiation of the South China Sea basin. In the context of regional geodynamics, it is proposed that these dykes were formed in a tectonic setting transiting from a Pacific-related back-arc to a passive continental margin pertaining to the development of the South China Sea basin.

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“…2021) and even in the Qinling orogen (Cai et al . 2020). Therefore, it seems that a prevailing E–W extension dominated the eastern China continent at the time.…”

Section: Discussionmentioning

confidence: 99%

Mafic to felsic dyke swarms in coastal Guangdong, China: geochemical and geochronological constraints on the latest Mesozoic geodynamics on the southern margin of the South China Block

Cai

Wu²,

Han³

2022

Geol. Mag.

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“…The Huayangchuan U-REE-Mo-Cu-Fe ore belt is located in the southern margin of the NCC, which consists mainly of the Archean-Paleoproterozoic basement of the Taihua Group and Proterozoic volcanic-sedimentary cover of the Xiong'er, Guandaokou and Luanchuan groups (Zhang et al, 1995). The Taihua Group is traditionally separated into upper and lower units by the 2.3 Ga boundary: The lower unit is mainly composed of amphibolites, gneisses and minor granulites, whilst the upper unit consists of garnet-sillimanite gneisses, graphite gneisses, marbles, quartzites, banded iron formations (BIFs), and minor mafic granulites and amphibolites (Cai et al, 2020). The Paleo-Mesoproterozoic Xiong'er Group comprises mainly mafic to felsic volcanic rocks with minor sedimentary and pyroclastic rocks, with zircon U-Pb ages of 1.78-1.45 Ga (Cai et al, 2020).…”

Section: Geological Setting 1regional Geologymentioning

confidence: 99%

“…The Taihua Group is traditionally separated into upper and lower units by the 2.3 Ga boundary: The lower unit is mainly composed of amphibolites, gneisses and minor granulites, whilst the upper unit consists of garnet-sillimanite gneisses, graphite gneisses, marbles, quartzites, banded iron formations (BIFs), and minor mafic granulites and amphibolites (Cai et al, 2020). The Paleo-Mesoproterozoic Xiong'er Group comprises mainly mafic to felsic volcanic rocks with minor sedimentary and pyroclastic rocks, with zircon U-Pb ages of 1.78-1.45 Ga (Cai et al, 2020). The Mesoproterozoic Guandaokou Group consists of low-grade metamorphosed terrigenous clastic rocks and marine Multiple-Stage Mineralization in the Huayangchuan U-REE-Mo-Cu-Fe Ore Belt of the Qinling Orogen, Central China carbonates.…”

Section: Geological Setting 1regional Geologymentioning

confidence: 99%

Multiple-Stage Mineralization in the Huayangchuan U−REE−Mo−Cu−Fe Ore Belt of the Qinling Orogen, Central China: Geological and Re−Os Geochronological Constraints

Jiang

Yang

Wang³

et al. 2022

J. Earth Sci.

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The Huayangchuan ore belt is located in the western segment of Xiaoqinling Orogen in the southern margin of the North China Craton (NCC), and hosts voluminous magmatism and significant U−REE−Mo−Cu−Fe polymetallic mineralization. However, geochronological framework of the various mineralization phases in this region is poorly understood. Here, we present new Re−Os isochron ages on magnetite from the Caotan Fe deposit (2 675 ± 410 Ma, MSWD = 0.55), and on pyrite from the Jialu REE deposit (2 127 ± 280 Ma, MSWD = 1.9) and Yuejiawa Cu deposit (418 ± 23 Ma, MSWD = 11.5), and Re−Os weighted average model age on pyrite from the Taoyuan Mo−U deposit (235 ± 14 Ma, MSWD = 0.17). These ages, combined with regional geology and mineralization ages from other deposits, suggest that mineralization in the Huayangchuan ore belt lasted from the Neoarchean to the Late Mesozoic. The mineralization corresponds to regional tectono-magmatic events, including the Neoar-chean alkali magmatism (REE mineralization), Paleoproterozoic plagioclase-amphibolite emplacement (Fe mineralization), Paleoproterozoic pegmatite magmatism (U mineralization), Paleozoic Shangdan oceanic slab subduction-related arc magmatism (Cu mineralization), Early Mesozoic Paleo-Tethys Ocean subduction-related arc magmatism (Mo−U mineralization), and Late Mesozoic Paleo-Pacific oceanic plate subduction direction change-related Mo(-Pb) mineralization. We proposed that the Huayang-chuan ore belt has undergone prolonged metallogenic evolution, and the magmatism and associated mineralization were controlled by regional geodynamic events.

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“…The Huayangchuan carbonatite type uranium-niobium rare earth polymetallic deposit is located in the Xiaoqinling area of the Qinling Orogenic Belt, Shaanxi Province [13][14][15][16][17][18]. The veined and irregular Indosinian carbonatite dike is the ore-bearing rock of this deposit, most of which intrudes the surrounding rocks along brittle faults [15][16][17].…”

Section: Introductionmentioning

confidence: 99%

“…The veined and irregular Indosinian carbonatite dike is the ore-bearing rock of this deposit, most of which intrudes the surrounding rocks along brittle faults [15][16][17]. Much systematic research on carbonatite rocks in the Huayangchuan deposit has been conducted, acquiring new knowledge of petrogenesis, metallogenic processes, and sources of ore-forming materials [13][14][15][16][17][18]. However, recent research reveals a certain amount of granitic vein intrusion in the Huayangchuan deposit, with observations of several tectonic-thermal events.…”

Section: Introductionmentioning

confidence: 99%

Insights from Dikes for Multistage Granitic Magmatism in the Huayangchuan Uranium Polymetallic Deposit, Qinling Orogen

Wang,

Tan,

Wan

et al. 2024

Minerals

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The Huayangchuan U-polymetallic deposit in the Qinling Orogen is a newly verified carbonatite-hosted deposit on the southern margin of the North China Craton (NCC) in Central China. Granitic magmatism is extensively developed in the Huayangchuan deposit area and is lacking analysis on the reasons for these situations; however, its ages, petrogenesis, and relationship with uranium mineralization are not well constrained. Zircon U–Pb ages for the hornblende-bearing granite porphyry and medium-fine-grained biotite granites in close proximity to carbonatite rocks are 229.8 ± 1.1 and 135.3 ± 0.6 Ma, respectively. High-K calc-alkaline series and weakly peraluminous Triassic hornblende-bearing granite porphyry are slightly enriched in light rare earth elements (LREE) with flat heavy rare earth element (HREE) patterns, enriched in Ba and Sr, and depleted in Nb, Ta, P, and Ti, i.e., geochemical characteristics similar to those of adakite-like rocks. The Early Cretaceous medium-fine-grained biotite granites are characterized by LREE enrichment and flat HREE patterns, which belong to high-K calc-alkaline series, and metaluminous belong to weakly peraluminous I-type granite, with U and large ion lithophile element (LILE) enrichment and high field strength element depletion. The high initial 87Sr/86Sr ratios and enriched Nd (εNd(t) = −10.7 to −9.5 and −19.9 to −18.9, respectively) and Hf (εHf(t) = −21.8 to −13.0 and −30.5 to −19.0, respectively) isotopes revealed that both granitic rocks from the Huayangchuan deposit mainly originated from lower crustal materials, generated by partial melting of the ancient basement materials of the Taihua Group. Triassic hornblende-bearing granite porphyry is significantly different from the mantle origin of the contemporaneous U-mineralization carbonatite. In combination with tectonic evolution, we argue that the Qinling Orogenic Belt was affected by the subduction of the North Mianlian Ocean during the Late Triassic. The ongoing northward subduction of the Yangtze Craton resulted in crustal thickening, forming large-scale Indosinian carbonatites, U-polymetallic mineralization, and contemporaneous intermediate-acid magmatism. Additionally, due to the tectonic system transformation caused by Paleo-Pacific Plate subduction, intracontinental lithosphere extension and lithospheric thinning occurred along the southern NCC margin in the Early Cretaceous. Intense magma underplating of the post-orogeny created a large number of magmatic rocks. The tremendous heat could have provided a thermal source and dynamic mechanism for the Yanshanian large-scale U-polymetallic mineralization events.

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Multiple episodes of tectono-thermal disturbances in the Huayangchuan U-Nb-Pb polymetallic deposit in the Xiaoqinling region, central China and their significances on metallogeny

Cited by 10 publications

References 118 publications

Mafic to felsic dyke swarms in coastal Guangdong, China: geochemical and geochronological constraints on the latest Mesozoic geodynamics on the southern margin of the South China Block

Mafic to felsic dyke swarms in coastal Guangdong, China: geochemical and geochronological constraints on the latest Mesozoic geodynamics on the southern margin of the South China Block

Multiple-Stage Mineralization in the Huayangchuan U−REE−Mo−Cu−Fe Ore Belt of the Qinling Orogen, Central China: Geological and Re−Os Geochronological Constraints

Insights from Dikes for Multistage Granitic Magmatism in the Huayangchuan Uranium Polymetallic Deposit, Qinling Orogen

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