Newly discovered Ordovician Li-Be deposits at Tugeman in the Altyn-Tagh Orogen, NW China

Gao, Yongbao; Zhao, Xianzheng; Bagas, Leon; Wang, Yalei; Moushun, Jin; Lin, Lu; Gao, Yijie; Yan, Zhouquan; Teng, Jiaxin; Yang, Zhiquan

doi:10.1016/j.oregeorev.2021.104515

Cited by 6 publications

(6 citation statements)

References 51 publications

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“…Formation times of granites and granitic pegmatite Li-Be deposits in the CAB. The granite ages of the NAB are from [90][91][92][93][94][95][96][97][98][99][100][101]; the granite ages of the CAB are from [46][47][48]60,62,[88][89][90][102][103][104][105]. Igneous crystallization and mineralization ages of Li-Be deposits are consistent with the literature in Figure 1.…”

Section: Formation Times Of the Tashitaban LI Granitic Pegmatitessupporting

confidence: 75%

“…The regional magmatic activity is characterized by multiple episodes and diverse types of processes exhibiting a northeast to east-northeast trend. The early Paleozoic magmatic rock types are biotite granite and muscovite granite, with the emplacement age between 522 and 432 Ma [42,44,[46][47][48][59][60][61][62].…”

Section: Regional Geological Backgroundmentioning

confidence: 99%

“…Systematic study of the P-T-t evolution and zircon age in HP-UHP metamorphic rocks inferred three phases of metamorphism corresponding to the continental deep subduction (~509-490 Ma) and rollback of the subducting slab (~490-440 Ma) [148,149]. Extensive magmatism was triggered by this, and consequently granitoids were formed between 522 and 432 Ma, with to the I-and S-type affinities [46][47][48][59][60][61][62]88,89,[102][103][104][105]. The tectonic regime has changed to extension in South of the Central Altun block after 432 Ma, which is characterized by intraplate granites (432-418 Ma) [66,150], bimodal volcanic rocks (406 Ma) [151], and Atype granites (432-385 Ma) [152][153][154].…”

Section: Geodynamic Se Ing Of the Tashitaban LI Granitic Pegmatite De...mentioning

confidence: 99%

“…Currently, there are nine rare-metal granitic pegmatite deposits of medium to large scale that have been discovered in the region with mineralization age in 499-445 Ma. These deposits are categorized from southwest to northeast as the Washixia district, the Ayake district, the Kumusayi district, and the Tashidaban district [44][45][46][47][48][49]. The Washixia district and the Tashidaban district have been preliminarily identified as large to super-large scale.…”

Section: Introductionmentioning

confidence: 99%

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Geochronology and Geochemistry of Granitic Pegmatites from Tashidaban Li Deposit in the Central Altun Tagh, Northwest China

Kang,

Ma,

Zhang

et al. 2024

Minerals

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The Central Altun orogenic system is a result of the amalgamation of multiple micro-continental blocks and island arcs. This complex system originated from subduction–accretion–collision processes in the Proto-Tethys Ocean during the Early Paleozoic. Research has reported the discovery of several Li-Be granitic pegmatite deposits in the Central Altun Block, including the North Tugeman granitic pegmatite Li-Be deposit, Tugeman granitic pegmatite Be deposit, Tashisayi granitic pegmatite Li deposit, South Washixia granitic pegmatite Li deposit, and Tamuqie granitic pegmatite Li deposit. The Tashidaban granitic pegmatite Li deposit has been newly discovered along the northern margin of the Central Altun Block. Field and geochemical studies of the Tashidaban granitic pegmatite Li deposit indicate: (1) Spodumene pegmatites and elbaite pegmatites, as Li-bearing granitic pegmatites that form the Tashidaban granitic pegmatite Li deposit, intrude into the two-mica schist, and marble of the Muzisayi Formation of the Tashidaban Group. (2) Columbite–tantalite group minerals and zircon U-Pb dating results indicate that the mineralization age of Tashidaban Li granitic pegmatites is 450.2 ± 2.4 Ma with a superimposed magmatic event at around 418–422 Ma later. (3) Whole-rock geochemical results indicate that the Kumudaban rock sequence belongs to the S-type high-K to calc-alkaline granites and the Tashidaban Li granitic pegmatites originated from the extreme differentiation by fractional crystallization of the Kumdaban granite pluton.

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Section: Formation Times Of the Tashitaban LI Granitic Pegmatitessupporting

confidence: 75%

Section: Regional Geological Backgroundmentioning

confidence: 99%

Section: Geodynamic Se Ing Of the Tashitaban LI Granitic Pegmatite De...mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Geochronology and Geochemistry of Granitic Pegmatites from Tashidaban Li Deposit in the Central Altun Tagh, Northwest China

Kang,

Ma,

Zhang

et al. 2024

Minerals

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“…(a) Topographic map (from Web site http://www.ngdc.noaa.gov/mgg/global/) and location of the Altyn Tagh orogen and adjoining regions; (b) geological map of the Altyn Tagh orogeny (modified after Wang et al, 2013); (c) geological map of the Munabulake area (modified after RGHP, 2003); (d) profile map of the study site. 465–445 Ma granitic intrusions in the southern CAT and HP–UHP metamorphic terrain are adapted from the references denoted by numbers: [1] Cowgill et al (2003); [2] Zhang et al (2019); [3] Kang (2014); [4] Liu et al (2016); [5] Cao et al (2010); [6] Tian et al (2023); [7] Zhao, Gao, et al (2023); [8] Gao, Zhao, et al (2023); [9] Chen (2018); [10] Zhang et al (2016); [11] Chen (2007); [12] XACGS (2003); [13] Wu et al (2020) and [14] GDCAPF (2019). CAT, Central Altyn terrane; NASB, the North Altyn Tagh subduction–accretion belt; NAT, North Altyn Tagh terrane; SASB, South Altyn Tagh subduction–collision belt.…”

Section: Introductionmentioning

confidence: 99%

Middle to Late Ordovician flare‐up of granitoids, South Altyn Tagh: Reworking of exhumed continental crust

Zhou,

Zhao,

Yao

et al. 2024

Geological Journal

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A flare‐up of granitoids occurred at 465–445 Ma in the South Altyn Tagh, synchronously with the exhumation of subducted continental crust. Nevertheless, it remains enigmatic whether a petrogenetic connection exists between them. Here, we report a 454–451 Ma monzogranite pluton, which is characterized by abundant inherited zircons, located in the northern margin of the South Altyn Tagh high‐pressure (HP)—ultrahigh‐pressure (UHP) metamorphic terrane. U–Pb ages and Hf–O isotopic compositions of inherited and synmagmatic zircons are investigated to trace the source rocks and petrogenesis of this pluton. The inherited zircons (zircons that predate the magmatism) exhibit a wide range of ages from 2618 to 484 Ma, displaying three major peaks at 1800–1100 Ma, 1000–800 Ma and 500 Ma. By comparing these inheritance age patterns with zircon spectra of main (meta‐)sedimentary sequences and the widespread Early Neoproterozoic granites (presently as granitic gneisses) in South Altyn Tagh, along with zircon εHf(t) and whole‐rock Nd isotopic composition, we argue that the main source rocks of the studied monzogranite are Early Neoproterozoic granitic gneisses and Late Mesoproterozoic paragneisses from the South Altyn Tagh HP–UHP metamorphic terrane. The ca. 500 Ma inherited zircons have a metamorphic origin, which is simultaneous with the peak metamorphic ages of HP–UHP metamorphic rocks in the Altyn Tagh Complex. These observations indicate that the source rocks of the monzogranite pluton are the subducted continental crust, which underwent metamorphism at ca. 500 Ma and followed by partial melting at 454–451 Ma. In addition, synmagmatic zircons exhibit variable δ18O and εHf(t) values ranging from 5.4 to 11.7‰ and from −19 to +10.3, respectively, indicating a minor contribution of mantle‐derived melts in the formation of the monzogranite. Given the studied pluton and contemporaneous extensive granitoids (465–445 Ma), characterized by similar geochemistry and source rocks, are synchronous with the final exhumation of subducted South Altyn Tagh continental crust, we propose that the reworking of exhumed continental crust at middle to lower crustal depths is their main petrogenesis.

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Multiphase evolution of a Li-pegmatite field from the Tashisayi area, Altyn Tagh, NW China: insights from a petrological, geochemical, and geochronological study

Ma,

Xu,

Hong

et al. 2023

Miner Deposita

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Newly discovered Ordovician Li-Be deposits at Tugeman in the Altyn-Tagh Orogen, NW China

Cited by 6 publications

References 51 publications

Geochronology and Geochemistry of Granitic Pegmatites from Tashidaban Li Deposit in the Central Altun Tagh, Northwest China

Geochronology and Geochemistry of Granitic Pegmatites from Tashidaban Li Deposit in the Central Altun Tagh, Northwest China

Middle to Late Ordovician flare‐up of granitoids, South Altyn Tagh: Reworking of exhumed continental crust

Multiphase evolution of a Li-pegmatite field from the Tashisayi area, Altyn Tagh, NW China: insights from a petrological, geochemical, and geochronological study

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