Zircon U-Pb, Molybdenite Re-Os and Quartz Vein Rb-Sr Geochronology of the Luobuzhen Au-Ag and Hongshan Cu Deposits, Tibet, China: Implications for the Oligocene-Miocene Porphyry–Epithermal Metallogenic System

Huang, Hanxiao; Liu, Hong; Li, Guangming; Zhang, Linkui; Cao, Haitao; Zhou, Qing; Xin-xin, Wang; Yan, Guoqiang

doi:10.3390/min9080476

Cited by 9 publications

(2 citation statements)

References 44 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 (Huang, Liu, et al, 2019; Liu, Zhang, Huang, Li, Ouyang, et al, 2019), Eocene, and Miocene. These intrusive rocks intrude into the Middle Permian Angijie Formation (composed of sandstone, basalt and limestone).…”

Section: Geological Backgroundmentioning

confidence: 99%

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 Backgroundmentioning

confidence: 99%

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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“…The BNSZ, extending in an approximately east-west (a) Simplified tectonic map of Tibet Plateau (modified from Cao et al, 2019a, b;Liu et al, 2020aLiu et al, , 2021a; (b) tectonic map of the Bangong-Nujiang suture zone (Modified from Tang et al, 2016;Huang et al, 2019); (c) geological map of the Xibie Co area (modified from Hua ng et al, 2014;Pei et al, 2016). 1-Quaternary; 2-Miocene Kangtuo Formation; 3-Upper Jurassic Shamuluo Formation; 4-Middle Jurassic Buqu Formation; 5-Mid-Lower Jurassic Mugagangri Group; 6-Early Cretaceous biotite syenogranite; 7-basalt; 8-suture zone; 9-ophiolite; 10-Mid-Lower Jurassic Mugagangri Group; 11-Jurassic-Cretaceous volcanic rocks; 12-Jurassic-Cretaceous intermediate-acid intrusive rocks; 13-orogenic gold deposit; 14-epithermal gold deposit and skarn gold deposit; 15-porphyry type copper-gold deposit; 16-sampling positions.…”

Section: Geological Backgroundmentioning

confidence: 99%

Petrogenesis of an Early Cretaceous Xiabie Co I‐type Granite in Southern Qiangtang, Tibet: Evidence from Geochemistry, Geochronology, Rb‐Sr, Sm‐Nd, Lu‐Hf and Pb isotopes

Liu

Huang

et al. 2022

Acta Geologica Sinica (Eng)

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Cretaceous magmatism is widely distributed on both sides of the Bangong–Nujiang suture zone (BNSZ). These rocks record the subduction to closure history of the Bangong–Nujiang Tethys Ocean (BNO) and the collisional history between the Lhasa (LS) and Qiangtang (QT) terranes. The Xiabie Co granite in Nyima County, which located on the southern margin of the QT terrane, Tibet. In this study, whole‐rock geochemistry; Rb‐Sr, Sm‐Nd, and Pb isotopes; and laser ablation inductively coupled mass spectrometry (LA‐ICP‐MS) zircon U‐Pb ages and Lu‐Hf isotopes of the Xiabie Co granite in the Nyima area have been studied to constrain its petrogenesis and tectonic setting. Our study can help explain the tectonic evolution of the BNSZ and crust‐mantle interaction. Zircon U‐Pb dating indicates that the granite was emplaced at ca. 120 Ma. The granite contains a small amount of hornblende and has high silicon (SiO2 = 73.97–78.03 wt%), potassium (K2O = 4.75–6.53 wt%), and total alkali (K2O + Na2O = 7.98–8.98 wt%) contents; low calcium content (CaO = 2.33–4.11 wt%); and variable A/CNK (1.00–1.18) and A/NK (1.09–1.22) values. The P2O5 content of the granite negatively correlated with the SiO2 content. Thus, the Xiabie Co granite is a weakly peraluminous I‐type granite belonging to the high‐K calc‐alkaline to Shoshone series. It is enriched in light rare earth elements (LREEs) and relatively depleted in heavy rare earth elements (HREEs), with LREE/HREE ratios of 8.03–16.40 and LaN/YbN ratios of 10.2–27.1. Samples show right‐leaning chondrite‐normalized rare earth element patterns with pronounced negative Eu anomalies (Eu/Eu∗ = 0.67–0.76). The primitive‐mantle‐normalized trace element spider diagrams of the samples are right‐leaning zigzag curves, showing relative enrichment in large‐ion lithophile elements (LILEs, e.g., Rb, Th, U, and K) and depletion in high‐field‐strength elements (HFSEs, e.g., Nb, P, Ti, and Yb) and displaying striking Sr and Ba negative anomalies. The granite εHf(t) values were positive (2.9–9.9), whereas the whole‐rock εNd(t) values were negative (–2.841 to –2.33). The calculated (87Sr/86Sr)t, (206Pb/204Pb)t, (207Pb/204Pb)t, and (208Pb/204Pb)t values are 0.7014–0.7057 (0.7044 on average), 18.422–18.851 (18.670 on average), 15.625–15.642 (15.633 on average), and 38.332–38.681 (39.571 on average), respectively. On the basis of the aforementioned data, we propose that the Xiabie Co granite was derived from a primitive magma that originated from partial melting of juvenile lower crust with the addition of mantle materials. In addition, strong fractional crystallization occurred during the rock‐forming process. Given the geodynamic setting, our new data, together with previously reported achievements, imply that the Xiabie Co granite was formed during the LS–QT collision.

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The U/Pb method

Gaeta Tassinari

2024

Radiogenic Isotopes Applied to Mineral Exploration

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Zircon U-Pb, Molybdenite Re-Os and Quartz Vein Rb-Sr Geochronology of the Luobuzhen Au-Ag and Hongshan Cu Deposits, Tibet, China: Implications for the Oligocene-Miocene Porphyry–Epithermal Metallogenic System

Cited by 9 publications

References 44 publications

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

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

Petrogenesis of an Early Cretaceous Xiabie Co I‐type Granite in Southern Qiangtang, Tibet: Evidence from Geochemistry, Geochronology, Rb‐Sr, Sm‐Nd, Lu‐Hf and Pb isotopes

The U/Pb method

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