Subduction-related Late Triassic Luerma porphyry copper deposit, western Gangdese, Tibet, China: Evidence from geology, geochemistry, and geochronology

Liu, Hong; Huang, Hanxiao; Li, Guangming; Li, Wenchang; Zhang, Linkui; Lan, Shuangshuang; Lü, Menghong; Song, Wenjie

doi:10.1016/j.oregeorev.2022.105253

Cited by 4 publications

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“…The area is generally approximately 5500-6200 m above sea level, characterized by several U-shaped valleys, glaciers and sharp peaks (Figure 2a). The intrusive rocks exposed in this area are mainly from the Permian, Late Triassic Liu, Zhang, Huang, Li, Ouyang, et al, 2019) (Liu et al, 2023).…”

Section: Geological Characteristics Of the Study Areamentioning

confidence: 96%

“…Eocene and Miocene acidic intrusive rocks are sporadically exposed in the form of dikes. Among them, the Late Triassic Luerma porphyry copper deposit is produced in Late Triassic quartz monzonite porphyry (Liu et al, 2023).…”

Section: Geological Backgroundmentioning

confidence: 99%

“…Simplified tectonic and geological maps. (a) Simplified tectonic map of the Qinghai–Tibet Plateau, modified from Liu, Zhang, Huang, Li, Lü, et al (2019), Liu, Xiao, Huang, Zhang, Lan, et al (2019), (b) simplified tectonic map of the Lhasa terrane, modified from Liu, Zhang, et al (2020), Huang, Dai, et al (2021), (c) simplified geological map of the Luerma area, modified from Liu et al (2021); 1— Neogene igneous rocks; 2— Palaeogene igneous rocks; 3— Cretaceous igneous rocks; 4— Jurassic igneous rocks; 5— Triassic igneous rocks; 6— Permian igneous rocks; 7— Linzizong volcanic rocks; 8— Quaternary river valley; 9— Volcanics in the Palaeocene Dianzhong Fm. ; 10— Limestone in the Upper Triassic Jiangrang Fm.…”

Section: Introductionmentioning

confidence: 99%

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Petrogenesis and tectonic environment of the Middle Permian Luerma igneous complex in the southern Lhasa subterrane, Tibet: Evidence from geochemistry; Rb–Sr, Sm–Nd, and Lu–Hf isotopes; and zircon U–Pb geochronology

Liu

et al. 2023

Geological Journal

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Due to the lack of corresponding magmatic records, the timing of the opening of the Yarlung–Tsangpo Neo‐Tethyan Ocean remains controversial. The Middle Permian Luerma igneous complex, which is situated in the western Gangdese magmatic belt of the southern Lhasa subterrane, western Tibet, can be divided into four or more rock types, including foid gabbro, amphibole gabbro, monzogabbro, and pyroxene‐bearing monzodiorite. Through zircon U–Pb dating using laser ablation–inductively coupled plasma–mass spectrometry, the age of the Luerma igneous complex is determined to be ~261 Ma. The complex is rich in titanium, iron, magnesium, and total alkalis, with medium to high levels of calcium, potassium and aluminium, as well as low levels of silicon. Therefore, it is classified as a shoshonite–latite rock series. The complex is relatively enriched in light rare earth elements and high‐field‐strength elements, without obvious Eu and Ce anomalies. These rocks exhibit relatively low (87Sr/86Sr)i values, high εNd(t) values, and high εHf(t) values. The geochemical and isotopic characteristics indicate that the magmas are derived from partial melting of the upper mantle in an intraplate tectonic environment. The new data presented here provide supplementary evidence for the initial rifting of the Lhasa terrane from the northern margin of Gondwana during the Middle Permian. These data also confirm that the opening of the Yarlung–Tsangpo Neo‐Tethyan Ocean occurred in the Middle Permian.

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Section: Geological Characteristics Of the Study Areamentioning

confidence: 96%

Section: Geological Backgroundmentioning

confidence: 99%