Mobilization and enrichment of high-field strength elements during late- and post-magmatic processes in the Shuiquangou syenitic complex, Northern China

Jiang, Neng; Sun, Shengsi; Chu, Xuelei; Mizuta, Toshio; Ishiyama, Daizo

doi:10.1016/s0009-2541(03)00162-1

Cited by 40 publications

(27 citation statements)

References 16 publications

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“…Intensive postmagmatic hydrothermal alteration of the syenite was observed at the mining area, which includes silicification and K-feldspathization during which euhedral allanite was replaced by anhedral allanite, and chervkinite-(Ce) was replaced by an allanite and ilmenite association, which is likely the cause of the REE tetrad in altered rocks. The inferred composition of the hydrothermal fluids is characterized by high alkalic and F contents (Jiang, 2006(Jiang, , 2003. Several gold deposits including the Dongping, Zhongshangou and Huogou deposits have been exploited in the inner contacts or inside of the Shuiquangou syenite complex.…”

Section: Geological Backgroundmentioning

confidence: 99%

“…The zircon grains from the disseminated ore and from the gray auriferous quartz vein, which yield U-Pb ages of 389 ± 1.0 Ma and 385 ± 5.7 Ma, respectively, and exhibit CL images and U, Th, Pb, and REE concentrations, are different from those of the magmatic zircon. Therefore, the U-Pb dates of these hydrothermal zircon grains may identify an early stage of gold mineralization that is related to post-magmatic hydrothermal processes and pervasive metasomatism (Jiang et al, 2003).…”

Section: Timing Of Gold Mineralizationmentioning

confidence: 99%

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U–Pb dating of hydrothermal zircon from the Dongping gold deposit in North China: Constraints on the mineralization processes

Bao

Sun

et al. 2014

Ore Geology Reviews

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Section: Geological Backgroundmentioning

confidence: 99%

Section: Timing Of Gold Mineralizationmentioning

confidence: 99%

U–Pb dating of hydrothermal zircon from the Dongping gold deposit in North China: Constraints on the mineralization processes

Bao

Sun

et al. 2014

Ore Geology Reviews

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“…As at Cnoc nan Cuilean, these minerals both replaced earlier phases and infilled fractures in primary minerals. In the Shuiquangou syenitic complex, Northern China, hydrothermally altered syenite also exhibits the introduction of biotite and allanite (Jiang et al 2003).…”

Section: Concentration Of the Ree In More Mafic Lithologiesmentioning

confidence: 99%

“…However, in other REE-mineralised deposits such as the Ivigtut pluton in Greenland and Olympic Dam in Australia, Nd isotope data have been used to show that exotic, mantle-derived fluids have introduced the REE and other elements into hydrothermally altered granitoids (Johnson and McCulloch 1995;Goodenough et al 2000). In the Shuiquangou complex, both late-magmatic and externally derived fluids have been inferred (Jiang et al 2003). Minerals from the Cnoc nan Cuilean biotite-magnetite veins contain very few fluid inclusions that would be suitable for study, and so fluid compositions can only be inferred from compositions of minerals in these veins.…”

Section: Concentration Of the Ree In More Mafic Lithologiesmentioning

confidence: 99%

Enrichment of Rare Earth Elements during magmatic and post-magmatic processes: a case study from the Loch Loyal Syenite Complex, northern Scotland

Walters

Goodenough

Hughes

et al. 2013

Contrib Mineral Petrol

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Concern about security of supply of critical elements used in new technologies, such as the Rare Earth Elements (REE), means that it is increasingly important to understand the processes by which they are enriched in crustal settings. High REE contents are found in syenitedominated alkaline complexes intruded along the Moine Thrust Zone, a major collisional zone in north-west Scotland. The most northerly of these is the Loch Loyal Syenite Complex, which comprises three separate intrusions. One of these, the Cnoc nan Cuilean intrusion, contains two mappable zones: a Mixed Syenite Zone in which mafic melasyenite is mixed and mingled with leucosyenite and a Massive Leucosyenite Zone. Within the Mixed Syenite Zone, hydrothermal activity is evident in the form of narrow altered veins dominated by biotite and magnetite; these are poorly exposed and their lateral extent is uncertain. The REE mineral allanite is relatively abundant in the melasyenite and is extremely enriched in the biotite-magnetite veins, which have up to 2 % total rare earth oxides in bulk rock analyses. An overall model for development of this intrusion can be divided into three episodes: (1) generation of a Light Rare Earth Element (LREE)-enriched parental magma due to enrichment of the mantle source by subduction of pelagic carbonates; (2) early crystallisation of allanite in melasyenite, due to the saturation of the magma in the LREE; and (3) hydrothermal alteration, in three different episodes identified by petrography and mineral chemistry, generating the intense enrichment of REE in the biotite-magnetite veins. Dating of allanite and titanite in the biotite-magnetite veins gives ages of c. 426 Ma, overlapping with previously published crystallisation ages for zircon in the syenite.

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“…One of the rather uncommon accessory phases of alkaline rocks is titanian garnet (e.g. Ti-bearing garnet in nepheline syenite : Gomes 1969;in syenite: Ramasamy 1986;Turbeville 1993;Lang et al 1995;Jiang et al 2003;in ankaramite: Segalstad 1979; in ijolite-melteigite: Larsen 1942, Mitchell andPlatt 1979, and in phonolite: Azambre and Girod 1966;Varet 1969;Dingwell and Brearley 1985), which apart from its igneous occurrence is also found in skarns, hydrothermal assemblages and infrequently low to high-grade metamorphic rocks (Deer et al 1982;Dingwell and Brearley 1985). In comparison with metamorphic garnets, distinguishing between skarn-associated garnet, hydrothermal garnet and magmatic garnet derived from highly differentiated magma is more controversial.…”

Section: Introductionmentioning

confidence: 99%

Titanian garnet in nepheline syenite from the Kaleybar area, East Azerbaijan Province, NW Iran

Hajialioghli¹,

Moazzen²,

Milke³

2011

Central European Geology

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The Kaleybar nepheline syenite intrusion forms the largest silica undersaturated alkaline exposure in northwestern Iran. It consists of various rock types ranging from nepheline syenite to nepheline diorite that were emplaced during Eocene-Oligocene times, corresponding to the Alpine orogeny. The essential rock-forming minerals in nepheline syenite are plagioclase, K-feldspar, nepheline and amphibole. Clinopyroxene is the dominant phase in nepheline diorites. Titanian garnet occurs as an uncommon accessory phase forming reddish to deep brown individual grains.Chemically it is intermediate between Ti-andradite (67 to 78 mole %) and grossular (21 to 33 mole %) with TiO 2 contents ranging from 1.5 to 5.0 wt %. Stoichiometry and R-mode factor analysis on garnet chemistry show that the dominant exchange vectors are Si-Ti and Al-Fe substitutions in the tetrahedral and octahedral crystal sites, respectively. A magmatic origin of the investigated Ti-garnet is suggested on the basis of mineralogical criteria and chemical properties.

show abstract

Mobilization and enrichment of high-field strength elements during late- and post-magmatic processes in the Shuiquangou syenitic complex, Northern China

Cited by 40 publications

References 16 publications

U–Pb dating of hydrothermal zircon from the Dongping gold deposit in North China: Constraints on the mineralization processes

U–Pb dating of hydrothermal zircon from the Dongping gold deposit in North China: Constraints on the mineralization processes

Enrichment of Rare Earth Elements during magmatic and post-magmatic processes: a case study from the Loch Loyal Syenite Complex, northern Scotland

Titanian garnet in nepheline syenite from the Kaleybar area, East Azerbaijan Province, NW Iran

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