Zircon U–Pb dating, geochemistry and Sr–Nd–Pb–Hf–O isotopes for the Nan'getan granodiorites and mafic microgranular enclaves in the East Kunlun Orogen: Record of closure of the Paleo-Tethys

Xia, Rui; Wang, Changming; Min, Qingwen; Li, Wenliang; Carranza, Emmanuel John M.; Xiao-dong, Guo; Ge, Liu; Zeng, Guangzhong

doi:10.1016/j.lithos.2015.07.018

Cited by 70 publications

(93 citation statements)

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“…However, the Yuqikapa syeno‐granites (LA‐ICP MS zircon U–Pb age of 242.9 ± 2.6 Ma) of the West Kunlun exhibit a syn‐collisional tectonic setting and have been considered an indicator of the closure of the Paleo‐Tethys Ocean (Jiang et al, ). The Nan'getan granodiorites and dioritic enclaves may record the stage associated with an ocean closing and terrane collision (Xia, Wang, Qing, Li, et al, ). The Xilikete coeval host granodiorites and mafic enclaves, Kendekeke A‐type monzonitic granite, Hongshishan rhyolitic‐dacitic tuff from the EKOB with ages of ca.…”

Section: Discussionmentioning

confidence: 99%

“…The intrusive rocks are mainly composed of quartz diorite, granodiorite, monzonite, and granites, which were emplaced predominantly during the Triassic (Huang et al, ; Mo et al, ). Geochronological data have revealed that four major episodes of magmatism occurred in the EKOB at ~210, ~220, ~232, and ~243 Ma (Xia, Wang, Qing, Deng, et al, ; Xia, Wang, Qing, Li, et al, ). These Triassic granites are accompanied with extensive mineralization, including porphyry and skarn deposits along the North East Kunlun Fault, Central East Kunlun Fault, and SEKT, as well as their parallel secondary faults (Figure c).…”

Section: Regional Geologymentioning

confidence: 99%

“…Approximately 35 porphyry–skarn deposits have been discovered and explored in the EKOB, along the East Kunlun Fault (e.g., the Hutouya Cu–Pb–Zn skarn, Kendekeke Fe skarn, Yemaquan Fe skarn, and Yazigou porphyry Cu–Mo; Figure c). Previous published mineralization ages show that most of these deposits are associated with Triassic magmatism (Xia, Wang, Qing, Li, et al, ; Xia, Wang, Qing, Deng, et al, ). The genesis of ore‐forming granitoids related to the porphyry and skarn deposits in EKOB remains enigmatic due to the limited petrologic and geochemical studies of the granites.…”

Section: Introductionmentioning

confidence: 98%

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Petrogenesis and tectonic setting of the Shiduolong skarn Pb–Zn deposit in the East Kunlun Orogenic Belt: Constraints from whole‐rock geochemical, zircon U–Pb and Hf isotope analyses

et al. 2017

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The Shiduolong Pb–Zn deposit, located in the East Kunlun Orogenic Belt, is a medium‐scale skarn deposit (0.4 Mt metal reserves with a grade of 1.46% Pb and 4.38% Zn). The mineralization occurs along the contact zone between Carboniferous marbles and Triassic quartz diorite and granodiorite. Zircon LA‐ICP‐MS dating indicates that the Shiduolong quartz diorite is coeval with the granodiorite (245 Ma). Whole‐rock geochemical analysis shows that both phases are high‐K calc‐alkaline metaluminous (A/CNK < 1) I‐type granites with similar rare earth (REE) element contents and (La/Yb)N values, indicating that they formed via crystal fractionation from a common parental magma. However, the granodiorite has higher SiO2 contents, lower total Fe2O3, TiO2, MgO, Sr, and Ba contents, and more negative Eu anomalies than the quartz diorites, suggesting that the granodiorite experienced stronger fractional crystallization during magmatic evolution. The zircon εHf(t) values of the quartz diorite range from −3.3 to 1.6. The two‐stage model ages (TDM2) vary from 1,175 to 1,487 Ma. Hf isotope data indicate that the magma of the quartz diorite was mainly derived from partial melting of Mesoproterozoic lower crustal materials with contributions from mantle‐derived magmas. Combined with the regional tectonic and magmatic activities, we propose that the Shiduolong Pb–Zn deposit might have formed during the hydrothermal event associated with the release of magmatic water from the granodiorite‐quartz diorite intrusions, which were generated by the subduction of the Paleo‐Tethys oceanic slab in the Early Triassic.

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Section: Discussionmentioning

confidence: 99%

Section: Regional Geologymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 98%

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Petrogenesis and tectonic setting of the Shiduolong skarn Pb–Zn deposit in the East Kunlun Orogenic Belt: Constraints from whole‐rock geochemical, zircon U–Pb and Hf isotope analyses

et al. 2017

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“…Data for 277-245Ma intermediate-basic pluton are form (Xiong Fuhao et al, 2011;Xiong et al, 2012Xiong et al, , 2013Xiong et al, , 2014Huang et al, 2014;Liu et al, 2014); Data for 245-240Ma intermediate-basic pluton are form (Li Bile et al, 2012;Zhang et al, 2012;Xia et al, 2015b), respectively (the same below). Apr.…”

Section: Zircon U-pb Datingmentioning

confidence: 99%

Paleo‐Tethyan Oceanic Crust Subduction in the Eastern Section of the East Kunlun Orogenic Belt: Geochronology and Petrogenesis of the Qushi'ang Granodiorite

Chen

Pei

et al. 2017

Acta Geologica Sinica (Eng)

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The Qushi'ang granodiorite (QSG) is located at the central east of the ophiolitic melange belt in the East Kunlun Orogenic Belt (EKOB) in the northern margin of the Qinghai‐Tibetan Plateau. LA‐MC‐ICP‐MS zircon U–Pb dating suggests that the granodiorite and mafic microgranular enclaves (MMEs) crystallized 246.61±0.62 and 245.45±0.9 Ma ago, respectively. Granodiorite, porphyritic diorite, and MMEs are metaluminous and medium‐K calk ‐ alkaline series, with island‐arc magma features, such as LILE enrichment and HFSE depletion. The porphyritic diorite has high Cr (13.50 ppm to 59.01 ppm), Ni (228.53 ppm to 261.29 ppm), and Mg# (46–54). Granodiorite and porphyritic diorite have similar mineral compositions and evolved major and trace elements contents, particularly Cr and Ni, both of which are significantly higher than that in granites of the same period. The crystallization age of MMEs is close to that of granodiorite, and their major and trace elements contents are in‐between porphyritic diorite and granodiorite. The results suggest that the original mafic magma, which was the product of mantle melting by subduction process, intruded into the lower crust (Kuhai Rock Group), resulting in the formation of granodiorite. Countinous intrusion of mafic magma into the unconsolidated granodiorite formed MMEs and porphyritic diorite. The granodiorite reformed by late‐stage strike‐slip faulting tectonic event indicates that the strike‐slip fault of Middle Kunlun and the collision of the Bayanhar block with East Kunlun were later than 246 Ma. Therefore, the formation of the QSG not only indicates the critical period of evolution of East Kunlun but also represents the tectonic transition from oceanic crust subduction to slab breaking.

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“…Schematic map showing (a) major tectonic units of China, (b) three geological terranes of the EKO (modified after Xia et al, ), (c) simplified geological map of the eastern EKO [Colour figure can be viewed at wileyonlinelibrary.com]…”

Section: Regional Geologymentioning

confidence: 99%

Ore geology, fluid inclusions, and C–H–O–S–Pb isotopes of Nagengkangqieergou Ag‐polymetallic deposit, East Kunlun Orogen, NW China

Chen

et al. 2019

Geological Journal

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Several large Ag‐polymetallic deposits have been newly discovered in the eastern segment of the East Kunlun Orogen, with the largest one being the high‐grade Nagengkangqieergou deposit (3,017 tons Ag at 310.04 g/t). The Ag ore veins are hosted in the Palaeoproterozoic Jinshuikou Group and Upper Triassic Elashan Formation, principally along NW‐trending faults and volcanogenic ring fractures. Alteration and mineralization processes occurred in two periods (J and E), which are hosted in two different ore‐bearing sequences (Jinshuikou Group and Elashan Formation respectively). These two periods can be subdivided into Stages J‐I, J‐II, J‐III, and J‐IV and Stages E‐I, E‐II, and E‐III. Fluid inclusions in the ore‐bearing quartz and calcite comprise predominantly of vapour‐rich two‐phase (vapour + liquid) type and minor pure‐liquid type. Fluid inclusions in Stage J quartz and calcite homogenized mainly at 270–330°C, 250–310°C, 250–290°C, and 170–250°C, with salinities of 5–6 wt.%, 4–6 wt.%, 4–5 wt.%, and 3–5 wt.% NaCl equiv., respectively. Fluid inclusions in Stage E quartz homogenized mainly at 210–250°C, 170–230°C, and 150–170°C, with salinities of 6–7 wt.%, 4–5 wt.%, and 1–2 wt.% NaCl equiv., respectively. δ13C and δ18OSMOW values of the calcite samples are of −6.0‰ to −2.8‰ and 5.2‰ to 20.5‰, respectively. The results indicate a mantle‐derived magmatic source and low temperature alteration. and δDV–SMOW values of the quartz and calcite from the Jinshuikou Group vary from −1.9‰ to 9.0‰ and −116.5‰ to −69.3‰, respectively, whilst those of δ18OH2normalO quartz from the Elashan Formation vary from −11.6‰ to 7.8‰ and −99.7‰ to −86.7‰. The results indicate that the ore‐forming fluids are of medium‐low temperatures and low salinities and were originated from magmatic water to meteoric water. Sulfide δ34SV–CDT values of the Jinshuikou Group and the Elashan Formation are of −6.1‰ to 0.8‰ and −3.4‰ to 0.9‰, respectively, suggesting a mantle‐derived magmatic source. Sulfide 206Pb/204Pb, 207Pb/204Pb, and 208Pb/204Pb ratios of the J‐period ores (18.190–18.622, 15.598–15.725, and 38.383–39.103, respectively) and E‐period ores (18.408–18.420, 15.746–15.758, and 38.879–38.895, respectively) are similar to those of granodiorite porphyry and Elashan Formation (sub)‐volcanic rocks, respectively, indicative of genetic connections between them. Integrating new evidence from fluid inclusions and C–H–O–S–Pb isotopes, we suggest that (a) mantle‐derived materials and their mixture with crust‐derived ones were critical to the ore formation, (b) the Nagengkangqieergou deposit was formed in a magmatic system and a (sub)‐volcanic system under the syn‐ and post‐collisional tectonics of the East Kunlun Orogen, respectively.

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Zircon U–Pb dating, geochemistry and Sr–Nd–Pb–Hf–O isotopes for the Nan'getan granodiorites and mafic microgranular enclaves in the East Kunlun Orogen: Record of closure of the Paleo-Tethys

Cited by 70 publications

References 50 publications

Petrogenesis and tectonic setting of the Shiduolong skarn Pb–Zn deposit in the East Kunlun Orogenic Belt: Constraints from whole‐rock geochemical, zircon U–Pb and Hf isotope analyses

Petrogenesis and tectonic setting of the Shiduolong skarn Pb–Zn deposit in the East Kunlun Orogenic Belt: Constraints from whole‐rock geochemical, zircon U–Pb and Hf isotope analyses

Paleo‐Tethyan Oceanic Crust Subduction in the Eastern Section of the East Kunlun Orogenic Belt: Geochronology and Petrogenesis of the Qushi'ang Granodiorite

Ore geology, fluid inclusions, and C–H–O–S–Pb isotopes of Nagengkangqieergou Ag‐polymetallic deposit, East Kunlun Orogen, NW China

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