Constraining subduction-collision processes of the Paleo-Tethys along the Changning–Menglian Suture: New zircon U-Pb ages and Sr–Nd–Pb–Hf–O isotopes of the Lincang Batholith

Deng, Jun; Wang, Changming; Zi, Jian–Wei; Xia, Rui; Li, Qiang

doi:10.1016/j.gr.2017.10.008

Cited by 107 publications

(65 citation statements)

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“…The NYA is characterized by an intra-arc rift and a back-arc basin, with the development of volcanic massive sulfide Zn-Pb-Ag-Cu deposits and epithermal Ag-Hg deposits, however, the large-scale granitic batholiths of the NYA like that being studied here do not host any known economic deposits. The SYA (known as the "Zhongdian" arc) lacks a back-arc basin, but it developed extensive calc-alkaline arc volcanic rocks and porphyry-skarn Cu-polymetallic deposits [9,12]. Among these porphyry deposits, the Pulang copper deposit is the largest formed in the Late Triassic [12][13][14].…”

Section: Introductionmentioning

confidence: 99%

“…The SYA (known as the "Zhongdian" arc) lacks a back-arc basin, but it developed extensive calc-alkaline arc volcanic rocks and porphyry-skarn Cu-polymetallic deposits [9,12]. Among these porphyry deposits, the Pulang copper deposit is the largest formed in the Late Triassic [12][13][14]. Although there is an overlap of emplacement ages between SYA Pulang ore-bearing porphyry and NYA Daocheng granitoid, the Daocheng granitoid has no mineralization and if we can understand why, we can guide regional metallogenic exploration strategies.…”

Section: Introductionmentioning

confidence: 99%

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Geochronology, Oxidization State and Source of the Daocheng Batholith, Yidun Arc: Implications for Regional Metallogenesis

Zhang

Xue

2019

Minerals

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The Daocheng batholith consists of granite, granodiorite and K-feldspar megacrystic granite, which is located in the north Yidun Arc. It is a barren batholith in contrast to plutons of the same age that contain major copper deposits, such as Pulang to the south. In the Daocheng, abundant mafic microgranular enclaves (MMEs) mainly developed within granodiorite and K-feldspar megacrystic granite, which are characterized by quenched apatite, quartz eyes and plagioclase phenocrysts. LA-ICP-MS zircon U–Pb dating of host granodiorite yielded ages ranging from 223 Ma to 210 Ma, with a weighted mean of 215.3 ± 1.8 Ma. Zircons from MMEs yielded ages ranging from 218 Ma to 209 Ma, with a weighted mean of 214.2 ± 1.4 Ma. Geochemical analyses show that granodiorite is high-K, calc-alkaline and I-type, with SiO2 contents ranging from 67.90% to 70.54%. These rocks are metaluminous to marginally peraluminous (A/CNK = 0.98–1.00) and moderately rich in alkalis with K2O ranging from 3.28% to 4.59% and Na2O ranging from 3.18% to 3.20%, with low MgO (1.08%–1.29%), Cr (12.7 ppm–16.8 ppm), Ni (5.19 ppm–6.16 ppm) and Mg# (35–49). The MMEs have relatively low SiO2 contents (56.34%–60.91%), higher Al2O3 contents (16.06%–17.98%), higher MgO and FeO abundances and are metaluminous (A/CNK = 0.82–0.83). The MMEs and host granodiorite are enriched in light rare-earth elements (LREEs) relative to heavy rare-earth elements (HREEs), with slightly negative Eu anomalies, and enriched in Th, U and large ion lithophile elements (LILEs; e.g., K, Rb and Pb), and depleted in high field strength elements (HFSEs; e.g., Nb, Ta, P and Ti), showing affinities typical of arc magmas. The zircon εHf(t) values (−6.28 to −2.33) and ancient two-stage Hf model ages of 1.92 to 1.25 Ga, indicating that the magmas are generally melts that incorporated significant portions of Precambrian crust. The relatively low silica contents and high Mg# values of the MMEs, and the linear patterns of MgO, Al2O3 and Fe2O3 with SiO2 between the MMEs and host granodiorite, showing the formation of MMEs are genetically related to magma mixing. The Daocheng granodiorite is characterized by much lower zircon Ce4+/Ce3+ (average of 3.53) and low fO2 value (average of ∆FMQ = –10.84), whereas the ore-bearing quartz monzonite porphyries in the Pulang copper deposit are characterized by much higher zircon Ce4+/Ce3+ (average of 52.10) and high fO2 value (average of ∆FMQ = 2.8), indicating the ore-bearing porphyry intrusions had much higher fO2 of magma than the ore-barren intrusions considering that the high oxygen fugacity of the magma is conducive to mineralization.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Geochronology, Oxidization State and Source of the Daocheng Batholith, Yidun Arc: Implications for Regional Metallogenesis

Zhang

Xue

2019

Minerals

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“…The Middle Triassic volcanics consist of bimodal suite from Pantiange Formation (Figures and ; Table ; Deng et al, ; Mo et al, ; Zi, Cawood, Fan, Wang, Tohver, et al, ).The volcanics from the Weixi volcanic belt show obviously negative Nb, Ta, Ti and P anomalies and has the HFSE/LREE (Nb/La) ratios of 0.27–0.36 for acidic volcanics and 0.45–1.05 for basic volcanics, showing characteristics related to island arc volcanics. Meanwhile, the Middle Triassic basalt shows similar normalised patterns of trace elements to the crust and island arc basalt (Figure c,d).…”

Section: Discussionmentioning

confidence: 99%

“…The Paleo‐Tethys evolution includes the Devonian rift stage, Carboniferous–Permian ocean expansion, Early–Middle Permian oceanic crust subduction and the later syn‐collision and post‐collision processes (Deng et al, ; Fan, Peng, & Wang, ; Jian et al, , ; Pan, Wang, & Zhang, ). As the branch of the Paleo‐Tethys Ocean, Jinshajiang zone experienced a complex evolution history during the evolution of Paleo‐Tethys (Metcalfe, ; Sun & Jian, ; Zi, Cawood, Fan, Wang, Tohver, et al, ).…”

Section: Discussionmentioning

confidence: 99%

“…The STO has interested geologists for its complex geological history and major metallogenic belt (Metcalfe, , ; Mo et al, ; Reid, Wilson, & Liu, ; Reid, Wilson, Shun, Pearson, & Belousova, ). It had experienced Paleo‐Tethys phase from Early Palaeozoic to Mesozoic (Deng, Wang, Zi, Xia, & Li, ; Mo et al, ; Wang et al, ). As a result, abundant magmatic belts/arcs associated with subduction and collision distribute along the major sutures, such as Weixi volcanic belt along the Jinshajiang Suture mentioned in this study (Figures and ; Fan et al, ; Metcalfe, , ; Mo et al, ; Wang, Hou, Mo, Wang, & Xu, ; Wang et al, ; Yang et al, ; Xin, ; Xin et al, ; Zhong, ; Zi, Cawood, Fan, Wang, Tohver, et al, ).…”

Section: Introductionmentioning

confidence: 99%

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Sequence and petrogenesis of the volcanic rocks from the middle Sanjiang Tethys Orogen, SW China: Implications for the Sanjiang Paleo‐Tethyan evolution

Yang

Wang

et al. 2020

Geological Journal

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The volcano‐sedimentary sequences from the Weixi belt provide significance for the Sanjiang Paleo‐Tethys evolution. This manuscript constrains the ages of volcano‐sedimentary sequences by LA‐ICPMS U–Pb, including bimodal volcanics (245.0–244.0 Ma) from Pantiange Formation, trachyandesite–basaltic andesite (234 ± 2.0 Ma) from Cuiyibi Formation, high silica subalkaline rhyolite (221 ± 1.4 Ma) from Waigucun Formation and Early Jurassic high silica subalkaline rhyolite (184 ± 2.2 Ma). The volcanics show various Hf isotopic composition, which includes Middle Triassic dacite (ε Hf[t] = −15.7 to −8.5, TDM2 = 2,006–1,613 Ma), Late Triassic rhyolite (ε Hf(t) = −9.8 to +1.9, TDM2 = 1,667–1,021 Ma), Late Triassic trachyandesite (ε Hf(t) = +2.6 to +5.7, TDM2 = 990–816 Ma) and Early Jurassic rhyolite (ε Hf(t) = −2.7 to +1.1, TDM2 = 1,250–1,145 Ma). The Middle–Late Triassic volcanics exhibit similar characteristics, the content of SiO2 exerts positive correlation with K2O and negative correlation with oxide of Ti, Fe, Al, Mg, Ca, Mn and P. The Hf isotopic and geochemical features indicate that the Middle Triassic basalt and rhyolite derived from mantle and crust by crystal fractionation, respectively. The absence of Lower Jurassic strata and existence of Triassic bimodal volcanic sequences suggest that the middle Sanjiang Tethys Orogen experienced collision during the Middle Triassic with local extension resulting from oblique convergence. Late Triassic–Early Jurassic rhyolite exhibit high SiO2 (77.12–77.81 wt%), K2O (4.35–6.10 wt%), Na2O (1.91–3.15 wt%) content, and a negative Eu anomaly. Together with the sedimentary sequence, the middle Sanjiang Tethys Orogen evolved into post‐collision phase during Late Triassic – Early Jurassic.

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Petrogenesis of the Cenozoic Lianhuashan pluton (SW China): Constrained by zircon U–Pb geochronology, Lu–Hf isotope, and geochemistry

Wang

Yang

et al. 2019

Geological Journal

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Potassic magmatic rocks provide significant insights in understanding of mantle composition, evolution, and interaction with crust. Potassic magmatism along the Jinshajiang-Ailaoshan Paleo-Tethyan suture has drawn much attention. Whereas igneous intrusion in the Simao terrane, west to Jinshajiang-Ailaoshan potassic magmatic belt has rarely been investigated. Hence, we present zircon U-Pb ages and Lu-Hf isotope and whole-rock geochemistry for the Lianhuashan pluton. Zircon U-Pb dating from monzonite and quartz monzonite porphyry yield ages of 33.6 ± 0.2 and 33.5 ± 0.3 Ma, respectively. Monzonites are characterized by high K 2 O (4.93-5.16%) and K 2 O/Na 2 O (1.46-1.71), high Y (22.90-23.80 ppm), and Yb (1.87-2.21 ppm), relatively enrichment of light rare earth element (LREE). Zircons from monzonites show ε Hf (t) values ranging from −1.1 to +0.6 and crustal model ages (T DM C ) between 1.04 and 1.15 Ga. These geochemical features suggest that parent magmas of the rocks originated from a metasomatized lithospheric mantle. Quartz monzonite porphyries are characterized by high Sr (836.00-1,529.00 ppm), Sr/Y (70.85-99.93) and La/Yb (32.31-49.83), low Y (11.80-15.60 ppm), and Yb (0.95-1.30 ppm), enrichment in LREE and depletion in heavy rare earth elements (HREE).Quartz monzonite porphyries have higher Mg # , MgO, Ni, and Cr contents than the lower crust-derived adakite-like rocks. It is suggested that they were derived by variable degree of mixing between lower-crustal melts and mafic magmas. Based on petrology and geochemistry features, the following evolution process are concluded.During the Neoproterozoic, metasomatic-enriched mantle magma resulted from the bisubduction of oceanic plate; meanwhile, the crust thickened, and juvenile lower crust formed. During late Eocene, hot asthenosphere upwelled and K-rich mafic magmas resulted from the decompression of delamination, followed by magmatism emplacing, crystallizing, and the forming of the Lianhuashan pluton. KEYWORDS Lianhuashan potassic pluton, magmatism model, metasomatized lithospheric mantle, the Sanjiang Orogen ). However, few detailed investigations have been carried out on the Lianhuashan pluton in the Simao terrane, which restricts understanding of the deep crust-mantle interaction, the genesis, and dynamic processes of potassic magmatic rocks in the Jinshajiang-Ailaoshan Suture. The Lianhuashan pluton is part of the Jinshajiang-Ailaoshan potassic magmatic belt and a representative pluton developed in the Lanping basins. Despite of few geological and geochemical researches on the Lianhuashan pluton since the 2000s (Dong et al., 2005;Liu et al., 2017), the magma source, evolution, and the tectonic setting are still obscure. This is partly due to the lack of precise geochemical data and integrated studies. In this paper, we present zircon LA-ICP-MS U-Pb age, Lu-Hf isotope, and whole-rock geochemistry for the Lianhuashan pluton with a view to (1) constrain the crystallization age, (2) reveal the magma source and magma evolution, and (3) construct a geodynamic ...

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Constraining subduction-collision processes of the Paleo-Tethys along the Changning–Menglian Suture: New zircon U-Pb ages and Sr–Nd–Pb–Hf–O isotopes of the Lincang Batholith

Cited by 107 publications

References 57 publications

Geochronology, Oxidization State and Source of the Daocheng Batholith, Yidun Arc: Implications for Regional Metallogenesis

Geochronology, Oxidization State and Source of the Daocheng Batholith, Yidun Arc: Implications for Regional Metallogenesis

Sequence and petrogenesis of the volcanic rocks from the middle Sanjiang Tethys Orogen, SW China: Implications for the Sanjiang Paleo‐Tethyan evolution

Petrogenesis of the Cenozoic Lianhuashan pluton (SW China): Constrained by zircon U–Pb geochronology, Lu–Hf isotope, and geochemistry

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