Petrogenesis and magmatic–hydrothermal evolution time limitation of Kelumute No. 112 pegmatite in Altay, Northwestern China: Evidence from zircon UPb and Hf isotopes

Lv, Zheng-Hang; Zhang, Hui; Tang, Yong; Guan, Shenjin

doi:10.1016/j.lithos.2012.08.005

Cited by 74 publications

(62 citation statements)

References 72 publications

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“…If the eastern Junggar region had been experiencing northward subduction during the Late Carboniferous, the suture zone would be located south of eastern Junggar, which is clearly not the case. Eastern Junggar was likely experiencing southward subduction during the Late Carboniferous, with any northward subduction occurring beneath the Siberian Block (Zhu et al ., ; Briggs et al ., ; Long et al ., ; Yuan et al ., ; Cai et al ., , b, ; Lv et al ., ). Consequently, bidirectional subduction between eastern Junggar and the Altai Orogenic Belt during the Late Carboniferous is a plausible scenario.…”

Section: Discussionmentioning

confidence: 99%

“…Long et al, 2008;Wang et al, 2009b;Xiao et al, 2009b). The subduction-related granites that were emplaced in the Altai have been dated to between~479 Ma and~313 Ma Wang et al, 2011aWang et al, , 2011bLv et al, 2012), which suggests that subduction persisted from the Ordovician into the Late Carboniferous. Most postcollisional magmatic events occurred after~310 Ma, including the emplacement of the Suoerbulake (281 ± 4 Ma), Bukesala (277 ± 2 Ma), and Lamazhao (276 ± 9 Ma) granites Long et al, 2007;Yuan et al, 2007;Sun et al, 2008;Gan et al, 2010;Cai et al, 2011aCai et al, , 2011bCai et al, , 2012.…”

Section: Granites In Eastern Junggar and The Altai Orogenic Beltmentioning

confidence: 99%

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Geochronological, geochemical, and Sr–Nd–Hf isotopic studies of the Aketas adakitic granites in Eastern Junggar: Petrogenesis and tectonic implications

et al. 2017

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The Aketas adakitic granites are located in the Dulate Arc, in the northern part of the eastern Junggar region, Xinjiang (NW China). In this study, we determined the zircon U-Pb isotopic compositions, bulk-rock Sr-Nd-Hf isotopic compositions, and major and trace elements of Aketas granite samples. Sr ratios (0.70298-0.70350) and positive εNd(t) (+5.1 to +7.0) and εHf(t) values (+10.4 to +14.9) suggest that the Aketas adakitic granites were derived from the partial melting of lower crustal material in a subduction setting. This is further evidenced by high Mg# values (42.00-65.67), high SiO 2 and K 2 O content, and low Cr (<17.30 ppm), Co (<9.62 ppm), and Ni (<12.60 ppm) content. Bidirectional subduction occurred between eastern Junggar and the Altai Orogen during the Late Carboniferous, and in combination with other exposed Palaeozoic granites in eastern Junggar, the Aketas adakitic granites may represent the latest record of this subduction event. The emplacement of the Aketas adakitic granites implies that eastern Junggar was involved in southward subduction at 308 ± 2.3 Ma; therefore, the final collision between the Siberian and Kazakhstan blocks likely occurred between 310.3 and 307 Ma.

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Section: Discussionmentioning

confidence: 99%

Section: Granites In Eastern Junggar and The Altai Orogenic Beltmentioning

confidence: 99%

Geochronological, geochemical, and Sr–Nd–Hf isotopic studies of the Aketas adakitic granites in Eastern Junggar: Petrogenesis and tectonic implications

et al. 2017

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“…112 pegmatite by Lv et al (2012), eight different weighted mean 206 Pb/ 238 U ages were identified between 238 and 156 Ma, which can't be described as a single magmatic-hydrothermal activity that lasted for more than 80 Ma. Statistics of zircon 206 Pb/ 238 U ages from different pegmatites in the KJPF in this study and previous researches (eg.…”

Section: Discussionmentioning

confidence: 99%

“…Statistics of zircon 206 Pb/ 238 U ages from different pegmatites in the KJPF in this study and previous researches (eg. Ren et al, 2011;Lv et al, 2012;Qin et al, 2013) showing a normal distribution, with peaks at 238~233 Ma, 220~215 Ma, 208~188 Ma and 158~155 Ma, indicating that four generations of pegmatite have been formed. Thus, the pegmatite-generating magmatism occurred in pulses, and Li-Be-Nb-Ta pegmatites were formed by multiple magmatism.…”

Section: Discussionmentioning

confidence: 99%

Contribution of Multiple Magmatism to the Formation of Li‐Be‐Nb‐Ta Pegmatites: Evidence from Zircon U‐Pb Ages in the Kelumute‐Jideke Pegmatite Field, Northwestern China

Wang

Qing

Zhou

et al. 2014

Acta Geologica Sinica (Eng)

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Located in the central part of Altay pegmatite province, Northwestern China, the Kelumute-Jideke pegmatite field (KJPF) provides a natural lab to study the regional zonation of pegmatite and longevity of pegmatitic magmatism. Rare-metal pegmatites in the KJPF are interpreted to be genetically related to the emplacement of the Jideke two-mica granite, which is described as the parental pluton by previous studies (eg. Lv et al., 2012). Except for the Kelumute Li-Be-Nb-Ta pegmatite located inside the Jideke two-mica granite, other pegmatites with different types of mineralization distributed outward the parental pluton are as following: Azubai, Xiaojideke and Dajideke muscovite-Be, Qunkuer Be-Nb-Ta, Jiamukai LiNb-Ta and Kukalagai Li-Be-Nb-Ta pegmatite, corresponding to the regional zonation of pegmatite groups (Černý, 1991).Kelumute and Kukalagai are the only two large-scale rare metal deposits in the KJPF. The Kelumute No.112 pegmatite is 1200 m in length, varying in thickness from 3.81 m (east) to 7.31 m (west), and is 200 m deep; its rare metal reserve is the second largest after the most famous Koktokay No. 3 pegmatite in the Altay pegmatite province. The main part of No. 112 pegmatite occurs EWtrending, which is controlled by faults of same direction. Five internal zones have been identified by mineral assemblages and textures, including quartz-microclinealbite zone, blocky quartz-albite-microcline zone, quartzalbite-spodumene zone, albite-quartz-muscovite zone and saccharoidal albite zone. The Kukalagai No. 650 pegmatite dips westward with an angle of 60° to 78°, which is controlled by N-S trending foliation of biotitequartz schist. With a length of 1230 m and an average thickness of 9.88 m, the only internal zone in No. 650 pegmatite is quartz-spodumene-albite zone, with lepidolite aggregates and medium-coarse garnet grains developed locally. It iss worth mentioning that evidence of replacement (eg. saccharoidal albite and blocky quartzmuscovite) and reconstruction on the earlier pegmatite (nests of spodumene and massive albite in quartzspodumene-albite pegmatite) were identified during field observation in both No. 112 and No. 650 pegmatite. Zircon U-Pb DatingTo reveal the timing of pegmatitic magmatism, a study of LA-ICP-MS zircon U-Pb dating is conducted on the Kelumute and Kukalagai pegmatites. Zircons in this study are opaque and anhedral, indicating that these magmatic zircons have experienced different degrees of hydrothermal alteration. However, due to the high closure temperature, homogeneous, clear and less porous zircons or domains of these zircon grains still yield concordant ages with geological significance. Three weighted mean 206 Pb/ 238 U ages are observed in one sample from quartzalbite-spodumene zone of the Kelumute No. 112 pegmatite, which are 237 ± 5 Ma (n=1), 196.9 ± 4.5 Ma (n=8) and 156.6 ± 3.9 Ma (n=8). Similarly, one sample from quartz-spodumene-albite zone of the Kukalagai No. 650 pegmatite shows two weighted mean 206 Pb/ 238 U ages: 233.8 ± 2.5 Ma (n=9) and 204.4 ± 4.1 Ma (n=7).

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“…The A 2 -type granites are always associated with nonrift extensional environments (Eby, 1992). Recently, increasingly more Triassic rare element pegmatites have been reported in the Chinese Altay (Chen, 2011;Lv, Zhang, Tang, & Guan, 2012;Ma, 2014;Ren et al, 2011;Wang et al, 2007). According to the classification scheme presented by Cerny and Ercit (2005), these pegmatites belong to the Li, Cs and Ta (LCT) family, which may form in a postorogenic setting (Cerny, 1991).…”

Section: Implications For Tectonic Evolution Of the Chinese Altaymentioning

confidence: 99%

Petrogenesis and tectonic setting of the Middle Permian A‐type granites in Altay, northwestern China: Evidences from geochronological, geochemical, and Hf isotopic studies

et al. 2017

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The Jiangjunshan and Dakalasu alkali‐feldspar granites are located in the central part of the Chinese Altay orogen. In this paper, we present detailed geochemical, zircon U–Pb, and Hf isotopic data of these granites. The Jiangjunshan and Dakalasu alkali‐feldspar granites show a high content of SiO2 (72.05–73.27 and 69.55–71.04 wt%, respectively), total alkalis (Na2O + K2O = 8.41–8.71 and 7.24–8.66 wt%, respectively), and high‐field strength elements (Zr + Nb + Ce + Y = 400.3–482.9 and 156.7–339.3 ppm, respectively), as well as high Ga/Al ratios (10,000 × Ga/Al = 3.46–4.19 and 2.62–3.28, respectively) and depletion in Ba, Nb, Sr, and Ti, showing geochemical characteristics similar to those of A‐type granites. Zircon U–Pb dating of the Jiangjunshan and Dakalasu alkali‐feldspar granites yielded weighted mean dating 206Pb/238U ages of 268.3 ± 1.9 and 270.4 ± 1.9 Ma, respectively, indicating that these granites intruded during the Permian. The Jiangjunshan and Dakalasu alkali‐feldspar granites show highly variable zircon εHf(t) values ranging from −7.0 to +5.6, implying that these granites originated from a mixing of mantle‐derived magma with crustal materials. Our data on the Jiangjunshan and Dakalasu alkali‐feldspar granites, coupled with previous studies of Permian magmatism and metamorphism, suggest that the tectonic regime was in a postcollisional extensional environment in the Chinese Altay orogen during the Permian. Therefore, the change in stress from compression to extension and asthenospheric upwelling triggered by slab break‐off plays a significant role in the generation of Jiangjunshan and Dakalasu alkali‐feldspar granites.

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Petrogenesis and magmatic–hydrothermal evolution time limitation of Kelumute No. 112 pegmatite in Altay, Northwestern China: Evidence from zircon UPb and Hf isotopes

Cited by 74 publications

References 72 publications

Geochronological, geochemical, and Sr–Nd–Hf isotopic studies of the Aketas adakitic granites in Eastern Junggar: Petrogenesis and tectonic implications

Geochronological, geochemical, and Sr–Nd–Hf isotopic studies of the Aketas adakitic granites in Eastern Junggar: Petrogenesis and tectonic implications

Contribution of Multiple Magmatism to the Formation of Li‐Be‐Nb‐Ta Pegmatites: Evidence from Zircon U‐Pb Ages in the Kelumute‐Jideke Pegmatite Field, Northwestern China

Petrogenesis and tectonic setting of the Middle Permian A‐type granites in Altay, northwestern China: Evidences from geochronological, geochemical, and Hf isotopic studies

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