Petrogenesis of ca. 240 Ma intermediate and felsic intrusions in the Nan’getan: Implications for crust–mantle interaction and geodynamic process of the East Kunlun Orogen

Xia, Rui; Deng, Jun; Min, Qingwen; Li, Wenliang; Xiao-dong, Guo; Zeng, Guanzhong

doi:10.1016/j.oregeorev.2017.04.002

Cited by 29 publications

(15 citation statements)

References 78 publications

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“…[31]. Data of Dulan granodiorites in the NEKO were taken from Reference [32]; Nan'getan syenogranites in the NEKO were taken from Reference [33]; Balong syenogranite in the transition between the CEKO and SEKO were taken from Reference [34]; Yuqikapa syenogranites in West Kunlun were taken from Reference [35]. [31].…”

Section: Zircon U-pb Agementioning

confidence: 99%

“…(a) The chondrite-normalized REE contents and (b) primitive mantle-normalized immobile trace element content diagrams for the Kendenongshe rhyolitic tuff. Data source: the OIB and N-MORB lines were taken from Reference [31]; Dulan granodiorites in the NEKO were taken from Reference [32]; Nan'getan syenogranite in the NEKO were taken from Reference [33]; Yuqikapa syenogranites in West Kunlun were taken from Reference [35].…”

Section: Petrogenesis Of Kengdenongshe Rhyolitic Tuffmentioning

confidence: 99%

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Geochronology and Geochemistry of Ore-Hosting Rhyolitic Tuff in the Kengdenongshe Polymetallic Deposit in the Eastern Segment of the East Kunlun Orogen

et al. 2019

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The Kengdenongshe Au–Ag–Pb–Zn polymetallic deposit, a newly discovered large-scale polymetallic deposit in the southeastern section of the East Kunlun Orogen (EKO), contains an Au resource of 40 t, Ag resource of 690 t and Pb–Zn resource of 10.5 × 105 t. The ore-bearing rocks are mainly composed of laminar barite and rhyolitic tuff. In this study, LA-ICP-MS zircon U–Pb dating and whole rock major and trace elements analyses have been conducted on the ore-bearing rhyolitic tuff. LA-ICP-MS zircon U–Pb dating data show that these rhyolitic tuffs were emplaced at ca. 243.3 ± 1.6 Ma. The samples show similar features to those of S-type granites, including high contents of SiO2 (76.4–82.6 wt. %) and Al2O3 (11.0–12.7 wt. %) and relatively low concentrations of Na2O (0.35–2.43 wt. %) and CaO (0.095–0.124 wt. %), with high A/CNK (molar [Al2O3/(CaO + Na2O + K2O)]) (1.72–2.03) and K2O/Na2O ratios (1.41–17.1). Further, they exhibit depletion in HFSEs (High Field Strength Elements) and enrichment in LREEs (Light Rare Earth Element) with negative Eu anomalies (Eu/Eu* = 0.51–0.64). These geochemical characteristics indicate that the Kengdenongcuo rhyolitic tuff originated from the fluid-absent melting of a plagioclase-poor, clay-rich metapelitic source and experienced minor fractional crystallization. In combination with arc-type magmatism and contemporaneous syn-collision granitoids in the region, the Kengdenongcuo tuff formed in a continental collision setting, implying that the Bayan Har–Songpan Ganzi Terrane collided with the East Kunlun Terrane and the Paleo-Tethys Ocean was closed at the period of ~243 Ma. The Kengdenongcuo polymetallic deposit formed at about the same time.

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Section: Zircon U-pb Agementioning

confidence: 99%

Section: Petrogenesis Of Kengdenongshe Rhyolitic Tuffmentioning

confidence: 99%

Geochronology and Geochemistry of Ore-Hosting Rhyolitic Tuff in the Kengdenongshe Polymetallic Deposit in the Eastern Segment of the East Kunlun Orogen

et al. 2019

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“…The NKT is characterized by the Precambrian Jinshuikou Group metamorphic basement and widespread of the Early Palaeozoic and Mesozoic plutons with two age peaks of 420–400 and 260–220 Ma (Figure c; Z. Q. Liu, ). The Jinshuikou Group consists of marble, gneiss and amphibolite, and experienced amphibolite‐granulite‐facies metamorphism, which is covered by the Binggou Group with an unconformity contact (R. B. Li, Pei, et al, ; J. L. Li, Zhou, et al, ; Meng et al, ; R. Xia et al, ;Xiong, ; Xiong, Ma, Jiang, et al, ; Xiong, Ma, Zhang, et al, ). The Binggou Group comprises volcano‐sedimentary and low‐grade metamorphic rocks (Xiong, ).…”

Section: Geological Settingmentioning

confidence: 99%

“…The Binggou Group comprises volcano‐sedimentary and low‐grade metamorphic rocks (Xiong, ). Both the Jinshuikou Group and Binggou Group were intruded by the Early Palaeozoic and Mesozoic plutons (R. Xia et al, ; Xiong, ). The SKT is characterized by the Proterozoic Kuhai Group metamorphic basement and distribution of the Late Palaeozoic plutons.…”

Section: Geological Settingmentioning

confidence: 99%

“…It is widely accepted that the EKO records the history of the Proto‐Tethys‐related and Paleo‐Tethys‐related orogenesis (Hu et al, ; H. F. Yin & Zhang, ). A multitude of studies over the past decades focused on the tectonic evolution of Tethys orogenic system (J. J. Chen et al, ; Jiang et al, ; B. Liu et al, ; Mo et al, ; Şengör, ; R. Xia et al, ; Xiong, Ma, Zhang, Liu, & Jiang, ; Xu et al, ; Xu, Yang, Li, & Yao, ; H. F. Yin & Zhang, ). The timing of Proto‐Tethys Ocean closure remains controversial in the EKO: (a) Mo et al () considered that the Proto‐Tethys‐related Ocean closed in the Late Ordovician based on the Ar‐Ar ages of gabbro in the Tumuleke.…”

Section: Introductionmentioning

confidence: 99%

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Geochronology and geochemistry of the Late Devonian–Early Carboniferous volcanic rocks in Aksu River area, western end of the East Kunlun Orogen

Liu

et al. 2019

Geological Journal

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We present LA‐ICP‐MS zircon U–Pb dating, geochemical data for the Late Devonian–Early Carboniferous volcanic rocks in the Aksu River area, western end of the East Kunlun Orogen, with an aim to constrain the ages, petrogenesis, and tectonic setting of volcanic rocks and to comprehend the Late Devonian–Early Carboniferous tectonic evolution of the north branch of the Paleo‐Tethys Ocean. The Late Devonian–Early Carboniferous volcanic rocks are mostly composed of andesite and rhyolite. The new U–Pb ages show that the volcanic rocks formed in the Late Devonian–Early Carboniferous with ages of ca. 364–343 Ma. The volcanic rocks are classified as calc‐alkaline series. All of the volcanic rocks are characterized by enrichment in large‐ion lithophile elements (e.g., Rb, Ba, U, Sr, and K) and light rare earth elements and depletion in some high‐field‐strength elements (e.g., Nb, Ta, P, and Ti). The andesite samples have relatively high La/Nb (1.66–3.63) but low La/Ba (0.05–0.23) ratios, indicating the mantle source could be depleted mantle, and it had been metasomatized before partial melting. The rhyolite samples have low Nb/Ta and Zr/Hf ratios and Cr, Ni, and Co contents, which indicate that the material source was mainly crust derived and has experienced fractional crystallization process. Combined with our zircon U–Pb dating, geochemical data and geological field investigation, the tectonic setting of the Late Devonian–Early Carboniferous volcanic rocks is possibly related to the subduction process. Furthermore, the Paleo‐Tethys oceanic crust between the Bayan Har and East Kunlun‐Qaidam terrane northward subducted beneath the East Kunlun‐Qaidam terrane in the Late Devonian–Early Carboniferous, and the north branch of the Paleo‐Tethys Ocean between the Bayan Har and East Kunlun‐Qaidam terrane opening event should be earlier than this time (~364 Ma).

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Petrogenesis and tectonic significance of Late Triassic Baishiya granodiorite porphyries in the Dulan area, eastern segment of the East Kunlun Orogenic Belt, China

Liang

Xia

et al. 2020

Geological Journal

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The timing of closing of the A'nyemaqen Ocean—the north branch of the Palaeo‐Tethys Ocean—and the subsequent continental collision remain controversial. In this study, detailed geochronological and geochemical analyses of the Baishiya granodiorite porphyries in the Dulan area [eastern segment of the East Kunlun Orogen Belt (EKOB)] were conducted. The LA–ICP–MS zircon U–Pb dating analysis revealed that the Baishiya granodiorite porphyries were emplaced during the Late Triassic (~223 Ma) and possess adakitic features, including relatively high SiO2 (67.2–69.0 wt%), Al2O3 (15.2–15.9 wt%), and Sr (416–540 ppm) contents, low Y (10.5–12.3 ppm) and Yb (1.03–1.38 ppm) contents, and high Sr/Y and La/Yb ratios. They belong to the high‐K calc‐alkaline series and show significant light rare‐earth element enrichment, minor Eu anomalies, HFSE depletion, and LILE enrichment. The porphyries record a narrow range of (87Sr/86Sr)i ratios (0.709067–0.709920) and ɛNd(t) values (−6.84 to −5.27) with two‐stage model ages (TDM2) ranging from 1,426 to 1,554 Ma. These geochemical features imply that the Baishiya granodiorite porphyries originated from the partial melting of the thickened Mesoproterozoic lower crust by mixing with minor mantle‐derived material. Late Triassic adakitic magmatism in the eastern segment of the EKOB formed in a post‐collisional extension setting due to the closing of the A'nyemaqen Ocean since Early Triassic.

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Petrogenesis of ca. 240 Ma intermediate and felsic intrusions in the Nan’getan: Implications for crust–mantle interaction and geodynamic process of the East Kunlun Orogen

Cited by 29 publications

References 78 publications

Geochronology and Geochemistry of Ore-Hosting Rhyolitic Tuff in the Kengdenongshe Polymetallic Deposit in the Eastern Segment of the East Kunlun Orogen

Geochronology and Geochemistry of Ore-Hosting Rhyolitic Tuff in the Kengdenongshe Polymetallic Deposit in the Eastern Segment of the East Kunlun Orogen

Geochronology and geochemistry of the Late Devonian–Early Carboniferous volcanic rocks in Aksu River area, western end of the East Kunlun Orogen

Petrogenesis and tectonic significance of Late Triassic Baishiya granodiorite porphyries in the Dulan area, eastern segment of the East Kunlun Orogenic Belt, China

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