The Neoproterozoic alkaline rocks from Fangcheng area, East Qinling (China) and their implications for regional Nb mineralization and tectonic evolution

Zhu, Yu-Xiang; Wang, Lian-Xun; Ma, Changqian; Wiedenbeck, Michael; Wang, Wei

doi:10.1016/j.precamres.2020.105852

Cited by 21 publications

(23 citation statements)

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“…The Shuangshan alkaline complex originated from the melting of a small proportion of enriched mantle and has been contaminated to varying degrees by crust materials during emplacement, according to the isotopic data of Bao et al (2008) and Zhu et al (2020). After the emplacement of alkaline basaltic magma, silica-undersaturated rocks (nepheline and biotite syenite) were directly differentiated during the continuous evolution of magma.…”

Section: Samples and Analytical Methodsmentioning

confidence: 99%

“…889-844) shows A-type geochemical affinity and weak formation. The formation of two-stage plutons was related to the Grevillian-aged orogeny situated between the North Qinling terrane and the North China Block, indicating a transition of the tectonic setting from subduction, collision, and post-collisional collapse and extension [16]. The Shuangshan alkaline complex was formed in a post-collisional extensional setting [16,17].…”

Section: Geological Setting 21 Regional Geologymentioning

confidence: 97%

“…This complex, located in the eastern margin of the S-NCB and NQB, intrudes into the Neoproterozoic Luanchuan Group sericite-quartz schist. This complex was emplaced between 867 and 833 Ma based on the U-Pb ages of zircon and titanite [16]. Neoproterozoic plutons are widespread across the NQB and were formed in two stages with diverse geochemistry, geochronology, and structures [19].…”

Section: Geological Setting 21 Regional Geologymentioning

confidence: 99%

“…The Nb 2 O 5 concentration in this suit is in the range of 0.05-0.10 wt.% [15]. In recent years, some studies have examined the petrology, geochemistry, and geochronology of the host rocks of the Shuangshan Nb deposit [16,17]. However, the metallogenic mechanism of Nb has not yet been investigated.…”

Section: Introductionmentioning

confidence: 99%

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Textures and Chemical Compositions of Nb-Bearing Minerals and Nb Mineralization in the Shuangshan Nepheline Syenite Pluton, East Qinling, China

Wang

Tang

et al. 2021

Minerals

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The Shuangshan alkaline complex located in the Henan province of China is a newly discovered, potentially giant niobium (Nb) deposit. A variety of Nb-bearing minerals including pyrochlore, zircon, and titanite have been identified in this deposit. Distinct textural and chemical differences of pyrochlore and zircon indicate that both have different origins. The magmatic pyrochlore and zircon both have euhedral grains with small sizes. On the other hand, hydrothermal pyrochlore is mainly intergrown on the edge or inside of hydrothermal zircon in the form of an aggregate. Compared with magmatic pyrochlore, the contents of F, Ca, and Na in hydrothermal pyrochlore are obviously high. The texture and composition of hydrothermal pyrochlore and zircon indicate that Ca-bearing hydrothermal alteration resulted in the migration of Nb from Nb-bearing zircon and the reprecipitation of Nb to form aggregate pyrochlore. However, the quantitative calculation shows that the amount of Nb migrated from zircon is very small. Therefore, this study suggests that hydrothermal alteration plays a certain role in the redistribution of Nb, but the enrichment of Nb is limited.

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Section: Samples and Analytical Methodsmentioning

confidence: 99%

Section: Geological Setting 21 Regional Geologymentioning

confidence: 97%

Section: Geological Setting 21 Regional Geologymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Textures and Chemical Compositions of Nb-Bearing Minerals and Nb Mineralization in the Shuangshan Nepheline Syenite Pluton, East Qinling, China

Wang

Tang

et al. 2021

Minerals

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“…Alkaline-peralkaline melts are usually Zr-undersaturated and autocrystic zircons are hard to crystallize in such melts (Boehnke, Watson, Trail, Harrison, & Schmitt, 2013;Gervasoni, Klemme, Rocha-Júnior, & Bserndt, 2016;Hanchar & Watson, 2003;Siégel et al, 2018;Watson, 1979;). However, it has been discovered that autocrystic magmatic zircon can crystallize in some alkalic rocks Zhu, Wang, Ma, Wiedenbeck, & Wang, 2020). Meanwhile, some inherited zircons could survive in Zr-undersaturated melts due to short-residence time, an initially large size, or having been shielded from the melt (e.g., enclosed in another mineral phase) (Siégel et al, 2018).…”

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confidence: 99%

Geochronological study of biotite aegirine‐augite syenite in the Bengge area, Western Yunnan: An example of zircon U–Pb dating for alkalic rocks

et al. 2021

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The Bengge biotite aegirine-augite syenite (BAS) is located in the southern part of Yidun Arc, eastern margin of the Tibetan Plateau area. It is an integral part of the Bengge ultrapotassic rocks (UPR), an alkalic complex mainly consisting of BAS, biotite pyroxene syenite (BPS), and biotite syenite (BS). Geochronological studies including zircon LA-ICPMS U-Pb dating and biotite 40 Ar/ 39 Ar dating have been conducted on the Bengge BAS to constrain its emplacement age. The zircon U-Pb dating yields a wide range of ages from 209 ± 2 Ma to 239 ± 2 Ma, with the concordia 206 Pb/ 238 U age being 228 ± 8.9 Ma (MSWD = 0.13). Meanwhile, the biotite 40 Ar/ 39 Ar dating yields a plateau age of 205.7 ± 1.5 Ma. The whole-rock Zr-saturation temperature (T zir-sat ) of the Bengge BAS has shown to be very low (86 ± 13 C to 634 ± 13 C), which is much lower than Ti-in-zircon temperature (>758 C) of the zircons used for U-Pb dating. This indicates that the zircons in the Bengge BAS are inherited, and they were already present in the BAS melts before the melts became Zr-saturated.Similarly, the T zir-sat of the Bengge BPS and BS are 346 ± 14 C~549 ± 13 C and 281 ± 14 C~525 ± 13 C, respectively, which is also too low for magmatic zircon crystallization in the melts. The inherited zircons of Bengge BAS have typical features of magmatic zircon, with high (Sm/La) N ratios (2.54-819), Ce/Ce* ratios (4. and low La concentration. Low ε Hf (T) values (−5.0 to 0.42) and high U/Yb (0.67-12.6) values imply that the inherited zircons in the Benge BAS are derived from an early arc-magma system of the Yidun Arc. The biotite 40 Ar/ 39 Ar dating constrains the Bengge BAS emplacement age at 205.7 ± 1.5 Ma, the time when the arcmagma activity had ceased, and a regional geodynamic transition in the Yidun Arc from convergence to back-arc spreading had started.

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Mesoproterozoic–Neoproterozoic chronostratigraphic framework and provenance analysis in the southeastern North China Craton and its tectonic significance

et al. 2023

Geological Journal

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The Sishilichangshan area of southwestern Xuhuai Basin, located in southeastern North China Craton (NCC) and to the north of the Qinling–Dabie Orogenic belts, is a key, optimal area to study the regional evolution of the NCC because of its stratigraphic differences within the NCC. An integrated approach of the field investigation, element geochemistry, and detrital zircon U–Pb–Hf isotope analysis reveals essential information on the Mesoproterozoic–Neoproterozoic tectonic‐sedimentary evolution of the Xuhuai Basin. The youngest graphical peak ages of detrital zircons from the Shouxian Formation at the top of the Bagongshan Group, the Jiuliqiao Formation at the bottom of the Huainan Group, and the Anyangshan Formation are 1003 ± 25 Ma, 991 ± 80 Ma, and 832 ± 23 Ma, respectively. New age constraints and stratigraphic correlations show that the traditional Neoproterozoic strata in the southern Xuhuai Basin consist of Late Stenian to Early Tonian Bagongshan and Huainan groups, and the Late Tonian Anyangshan Formation, which overlapped unconformably with mid‐late Ediacaran or Cambrian Series 2 strata. The Anyangshan Formation is first termed in this study, and its equivalent strata occur sporadically in the southeastern, southwestern and northwestern NCC. The Tonian Shouxian, Jiuliqiao, and Anyangshan formations are characterized by detrital zircons of multi‐stage Mesoproterozoic ages and predominantly positive εHf(t) values, with differences in mineral composition, whole‐rock geochemistry, and the Early Neoproterozoic detrital zircon age population. Their possible provenance was a Grenvillian orogen extending from the North Qinling Terrane (NQT) to the central Korean Peninsula, supporting Late Mesoproterozoic to Early Neoproterozoic initial accretion related to the continental arc between the NCC and NQT. Tectonic transition from Late Stenian to Early Tonian (~1.18–0.94 Ga) collisional basin to mid‐late Tonian (0.94–0.74 Ga) rift basin is interpreted as the response of the NCC to the assembly and extension of the Rodinia Supercontinent.

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The Neoproterozoic alkaline rocks from Fangcheng area, East Qinling (China) and their implications for regional Nb mineralization and tectonic evolution

Cited by 21 publications

References 83 publications

Textures and Chemical Compositions of Nb-Bearing Minerals and Nb Mineralization in the Shuangshan Nepheline Syenite Pluton, East Qinling, China

Textures and Chemical Compositions of Nb-Bearing Minerals and Nb Mineralization in the Shuangshan Nepheline Syenite Pluton, East Qinling, China

Geochronological study of biotite aegirine‐augite syenite in the Bengge area, Western Yunnan: An example of zircon U–Pb dating for alkalic rocks

Mesoproterozoic–Neoproterozoic chronostratigraphic framework and provenance analysis in the southeastern North China Craton and its tectonic significance

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