LA-ICP-MS U–Pb zircon, columbite-tantalite and<sup>40</sup>Ar–<sup>39</sup>Ar muscovite age constraints for the rare-element pegmatite dykes in the Altai orogenic belt, NW China

Zhou, Qifeng; Qin, Kezhang; Tang, Dongmei; Guo, Hongwei; Sakyi, Patrick Asamoah

doi:10.1017/s0016756816001096

Cited by 31 publications

(36 citation statements)

References 73 publications

(101 reference statements)

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“…The Chinese Altay orogen is located in the northern part of Xinjiang Uygur Autonomous Region, China and extends eastwards to Mongolia and westwards to Kazakhstan and Russia ( [26][27][28][29][30][31][32][33], Figure 1). This orogen is regarded as one of the most important rare-metal metallogenic belts in China [2,5,34,35]. Windley et al [26] divided the Chinese Altay orogen into six fault-bounded terranes, including the Altaishan terrane, the Northwest Altaishan terrane, the Central Altaishan terrane, the Qiongkuer-Abagong terrane, the Erqis terrane, and the Burkin-Ertai terrane ( Figure 1).…”

Section: Geological Settingmentioning

confidence: 99%

“…The Altaishan terrane is dominated by Late Devonian to Early Carboniferous metasedimentary rocks overlain by shale, siltstone, greywackes, and limestone [26,34]. The Northwest Altaishan terrane is mainly composed of Neoproterozoic-Early Devonian metasediments and schists that are unconformably overlain by shale, limestone, and andesitic breccia [5,34]. The Central Altaishan terrane is dominated by Neoproterozoic-Silurian amphibolite-facies gneisses, greenschist-facies metasediments, and metavolcanics [5].…”

Section: Geological Settingmentioning

confidence: 99%

“…The Kalu'an-Azubai pegmatite field, located in the Chinese Altay orogen, is one of the most important pegmatite fields for rare element (Li, Be, Nb, and Ta) resources and gemstone (mainly aquamarine) exploration in China [1][2][3][4][5]. Recently, this pegmatite field has attracted increasing attention not only because of the high global demand for lithium but also because of the pegmatite-granite relationship that has long puzzled geologists [2].…”

Section: Introductionmentioning

confidence: 99%

“…The well-defined regional zonation of the pegmatite group including barren pegmatites, Be-Ta-Nb pegmatites, and Li pegmatites, likely suggests that the exotic pegmatites formed through fractional crystallization of a granitic magma [2]. Yet recently reported chronological data precluded a direct genetic link between the rare-element pegmatites and their nearby granitic pluton (the Halong granite) [3][4][5]. According to these studies [3][4][5], the Halong granite was emplaced at 403.3-400.…”

Section: Introductionmentioning

confidence: 99%

“…Yet recently reported chronological data precluded a direct genetic link between the rare-element pegmatites and their nearby granitic pluton (the Halong granite) [3][4][5]. According to these studies [3][4][5], the Halong granite was emplaced at 403.3-400. 9 Ma whereas the emplacement ages of the rare-element pegmatites vary from 227.9 ± 2.6 Ma to 191.6 ± 2.0 Ma.…”

Section: Introductionmentioning

confidence: 99%

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Columbite U-Pb Geochronology of Kalu’an Lithium Pegmatites in Northern Xinjiang, China: Implications for Genesis and Emplacement History of Rare-Element Pegmatites

et al. 2019

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The Kalu’an-Azubai pegmatite field, one of the most important rare-metal metallogenic regions in China, contains a large number of pegmatite dikes belonging to spodumene and lepidolite subtypes. Columbite-group minerals (CGMs) collected from three spodumene subtype pegmatites (No. 802, No. 803, and No. 805 pegmatites) were analyzed for major element contents using EPMA (electron probe micro-analyzer) and dated using LA-ICP-MS (laser ablation-inductively coupled plasma mass spectrometer). The crystallization ages of the CGMs from No. 802, No. 803, and No. 805 pegmatites are 209.5 ± 1.4 Ma (2σ), 198.3 ± 2.0 Ma (2σ), and 224.3 ± 2.9 Ma (2σ), respectively. Oscillatory zoning and/or sector zoning along with the associated mineral assemblages suggest that the dated columbite is of magmatic origin. The crystallization ages of the columbite grains thus represent the emplacement ages of the Li pegmatites. Therefore, our dating results indicate that there were three emplacement events of the Li-rich pegmatite-forming melts in a timeframe of ~30 Ma. In combination with previous studies, we conclude that the Li pegmatites were formed before the Be-Ta-Nb pegmatites (~194–192 Ma), which precludes the genesis of rare-metal pegmatites via fractional crystallization of a granitic magma in the Kalu’an-Azubai region.

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Section: Geological Settingmentioning

confidence: 99%

Section: Geological Settingmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Columbite U-Pb Geochronology of Kalu’an Lithium Pegmatites in Northern Xinjiang, China: Implications for Genesis and Emplacement History of Rare-Element Pegmatites

et al. 2019

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Fluid inclusions, stable isotopes (H–O–S), and age constraints on the genesis of the Basitielieke polymetallic tungsten deposit in the Altay, Xinjiang, NW China

Yang

Li²,

et al. 2021

Geological Journal

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The Chinese Altay in Northwest China and adjacent regions in the Russian and Mongolian Altay form a tungsten province within the Central Asian Orogenic Belt. Unlike the Russian and Mongolian Altay, almost no tungsten deposits in the Chinese Altay have been reported. The Basitielieke deposit located in the Altay orogenic belt in Xinjiang is a newly discovered polymetallic tungsten deposit hosted in the skarn in the exocontact zone of a granite pluton. Mineralization can be divided into the skarn period and supergene oxidization period, the skarn period can be further divided into a prograde skarn stage (I), a retrograde skarn stage (II), and a quartz–sulphide stage (III). Scheelite mineralization mainly occurred in stage II, and Cu–Zn–Au formed in stage III. The ore‐forming fluid can be divided into a H2O–NaCl systems, including stage I (211 to 480°C and 2.24 to 14.04 wt% NaCl equiv) and stage II (178 to 336°C and 4.96 to 9.47 wt% NaCl equiv), and a H2O–CO2 (±CH4/N2)–NaCl system in stage III (130 to 434°C and 1.40 to 9.60 wt% NaCl equiv). Hydrogen, oxygen, and sulphur isotope compositions indicate that magmatic water participated in the hydrothermal mineralization system in stage I, and meteoric water increased with the process of mineralization. Sulphur was derived from deep‐seated magmas. The Basitielieke deposit is a reduced skarn polymetallic tungsten deposit. The deposit formed by hydrothermal fluid from the granite interacting with strata during the Early Permian, the fluid–rock interaction and fluid mixing (magmatic water and meteoric water) was the main precipitation mechanism of the Basitielieke polymetallic tungsten deposit.

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Petrogenetic studies of Permian pegmatites in the Chinese Altay: Implications for a two‐stage post‐collisional magmatism model

Wang

Zhang

et al. 2022

Geological Journal

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Understanding the petrogenesis of rare‐metal pegmatites is important for understanding ore‐forming processes and their tectonic settings. In this study, we performed zircon U–Pb geochronological and Hf–O isotopic analyses of the Xiaokalasu, Dakalasu, and Yelaman pegmatites in the Chinese Altay orogen. These pegmatites have low εHf(t) values (−0.6 ~ +4.3), two‐stage model ages of 989 ~ 1,293 Ma, and high δ18O values (+6.52 ~ +11.31), indicating that they may have been derived from the anatexis of mature sedimentary rocks in the deep crust, with a small amount of mantle‐derived or juvenile material. Geochronological and Hf–O isotopic data for granitic intrusions in the Chinese Altay Mountains indicate that the εHf(t) values decreased from the Permian to the Triassic, which implies that two‐stage post‐collisional magmatism occurred in this region. During the Permian, the thin lower crust was cold; thus, magmatism likely originated in the deep crust close to the Moho surface and involved intense mantle–crust interactions. During the Triassic, asthenospheric upwelling provided heat to the lower crust, which increased the geothermal gradient and led to the anatexis of shallow crustal material.

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LA-ICP-MS U–Pb zircon, columbite-tantalite and⁴⁰Ar–³⁹Ar muscovite age constraints for the rare-element pegmatite dykes in the Altai orogenic belt, NW China

Cited by 31 publications

References 73 publications

Columbite U-Pb Geochronology of Kalu’an Lithium Pegmatites in Northern Xinjiang, China: Implications for Genesis and Emplacement History of Rare-Element Pegmatites

Columbite U-Pb Geochronology of Kalu’an Lithium Pegmatites in Northern Xinjiang, China: Implications for Genesis and Emplacement History of Rare-Element Pegmatites

Fluid inclusions, stable isotopes (H–O–S), and age constraints on the genesis of the Basitielieke polymetallic tungsten deposit in the Altay, Xinjiang, NW China

Petrogenetic studies of Permian pegmatites in the Chinese Altay: Implications for a two‐stage post‐collisional magmatism model

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LA-ICP-MS U–Pb zircon, columbite-tantalite and40Ar–39Ar muscovite age constraints for the rare-element pegmatite dykes in the Altai orogenic belt, NW China

Cited by 31 publications

References 73 publications

Columbite U-Pb Geochronology of Kalu’an Lithium Pegmatites in Northern Xinjiang, China: Implications for Genesis and Emplacement History of Rare-Element Pegmatites

Columbite U-Pb Geochronology of Kalu’an Lithium Pegmatites in Northern Xinjiang, China: Implications for Genesis and Emplacement History of Rare-Element Pegmatites

Fluid inclusions, stable isotopes (H–O–S), and age constraints on the genesis of the Basitielieke polymetallic tungsten deposit in the Altay, Xinjiang, NW China

Petrogenetic studies of Permian pegmatites in the Chinese Altay: Implications for a two‐stage post‐collisional magmatism model

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LA-ICP-MS U–Pb zircon, columbite-tantalite and⁴⁰Ar–³⁹Ar muscovite age constraints for the rare-element pegmatite dykes in the Altai orogenic belt, NW China