Ages, Sources and Tectonic Settings of the Triassic Igneous Rocks in the Easternmost Segment of the East Kunlun Orogen, central China

Haidong, Ren; Wang, Tao; Zhang, Lei; Wang, Xiaoxia; Huang, He; Chen, Feng; Teschner, Claudia; Song, Peng

doi:10.1111/1755-6724.12696

Cited by 29 publications

(8 citation statements)

References 36 publications

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“…The chondrite values and primitive mantle values were from [43]. Previous data are from [3,14,16,18,44,45], and they represent igneous rock samples in the East Kunlun Orogen of the same period as the volcanic rocks studied in this paper.…”

Section: Major and Trace Element Of Whole-rock Geochemistrymentioning

confidence: 99%

“…2 The metamorphic records (~246 Ma and ~242 Ma) in the Qingshuiquan amphibolite facies mica schist [52] and the Jinshuikou granitic gneiss [53] proved that there was a middlehigh-pressure metamorphism in the Middle Triassic of the East Kunlun Orogen. 3 The presence of ~240 Ma Cahantaolegai peraluminous granite [54] and the appearance of S-type granite rocks (e.g., ~240 Ma Kengdenongshe S-type peraluminous rhyolitic tuff [15,16]) imply the crustal thickening and deep crustal melting caused by continental collision. Our research results and these geological events show that the Paleo-Tethys Ocean Basin had closed before the end of the Middle Triassic.…”

Section: Evaluation Of Alterationmentioning

confidence: 99%

“…Subsequently, the 239.3-234.4 Ma volcanic eruption and the simultaneous intrusive rocks were formed in the slab failure environment, representing the beginning of the initial extension of the late stage of syn-collision. [3,14,18,44,45], and they represent igneous rock samples in the East Kunlun Orogen of the same period as the volcanic rocks studied in this paper.…”

Section: Evaluation Of Alterationmentioning

confidence: 99%

“…Its complex geodynamic evolution, tectono-magmatic activity, and multi-stage marginal orogeny and collisional orogeny, with huge potential for mineral resources, have attracted great attention in the geological community, and many related research works have been carried out. In recent years, more and more magmatic activities related to the subduction of the Paleo-Tethys Ocean have been identified in the East Kunlun Orogen, such as 264 Ma Jialuhe Syenogranite [1]; 259 Ma Wulonggou granodiorite [2]; 252 Ma Jiamuge'er rhyolite porphyry [3]; 251 Ma Xiangjiananshan granodiorite [4]; 248 Ma Nuomuhong quartz diorite [5]; 247 Ma Wutuo monzogranite [6], etc. However, the closure time of the Paleo-Tethys Ocean is still controversial.…”

Section: Introductionmentioning

confidence: 99%

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Petrogenesis, Sources, and Tectonic Settings of Triassic Volcanic Rocks in the Ela Mountain Area of the East Kunlun Orogen: Insights from Geochronology, Geochemistry and Hf Isotopic Compositions

2022

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The Ela Mountain area is located at the easternmost point of the East Kunlun Orogen, in which voluminous igneous rocks developed in the Triassic period, and it is a good place to investigate the tectonic evolution of the Paleo-Tethys Ocean. In this study, petrological, geochemical, zircon U-Pb geochronology and zircon Hf isotope studies were carried out on the volcanic rocks in the Ela Mountain area. Dacite (239.3 ± 1.4 Ma) exhibits calc-alkaline I-type characteristics, and rhyolite (237.8 ± 2.1 Ma) is similar to high-K calc-alkaline highly fractionated I-type volcanic rock. The petrogenesis shows that both rhyolite and dacite originated from the partial melting of the mafic lower crust of the Mesoproterozoic under relatively high temperature and low pressure. Dacite and rhyolite were derived from the same or similar parent magma, and they are volcanic rocks with different differentiation degrees formed in the same magmatic pulse activity. Differing from rhyolite and dacite, basaltic andesite shows a relatively young age (234 ± 1.2 Ma), mainly originating from the partial melting of the lithospheric mantle modified by subducted slab-derived fluids; the magma was contaminated with a small amount of crustal source components and experienced the fractional crystallization of mafic minerals before the eruption to the surface. This study on the tectonic environment of these volcanic rocks shows that they were formed in the environment of slab failure in the late stage of syn-collision, and that they are different types of volcanic rocks from different sources under similar tectonic environments. The volcanic rocks of the Ela Mountain area in this contribution provide important evidence for Middle Triassic to Late Triassic syn-collisional magmatism in the slab failure stages. The results of this study constrain the lower age limit of the closure of the Paleo-Tethys Ocean and the initial time of extension of the late stage of syn-collision, providing important information regarding regional tectonic evolution processes and volcanic activity history. They can be applied to regional tectonic evolution, petrology, volcanic stratigraphy and mineral deposits related to volcanic rocks.

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Section: Major and Trace Element Of Whole-rock Geochemistrymentioning

confidence: 99%

Section: Evaluation Of Alterationmentioning

confidence: 99%

Section: Evaluation Of Alterationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Petrogenesis, Sources, and Tectonic Settings of Triassic Volcanic Rocks in the Ela Mountain Area of the East Kunlun Orogen: Insights from Geochronology, Geochemistry and Hf Isotopic Compositions

2022

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“…Many recent papers have proposed that the metasomatized portions of the SCLM are enriched in chalcophile and highly siderophile elements, and that partial melting of this part of the mantle are particularly capable of forming magmatic ore deposits (Fiorentini and Beresford, 2008;Richardson and Shirey, 2008;Zhang et al, 2008;Arndt, 2013). The contrasting geochemical signatures between fertile and barren may be attributed not only to the heterogeneity of SCLM sources, but also to the complexity of AFC processes during the interaction between SCLM and overlying crustal materials.…”

Section: Sr-nd Isotopesmentioning

confidence: 99%

Geodynamic Setting and Cu-Ni Potential of Late Permian Xiwanggou Mafic-Ultramafic Rocks, East Kunlun Orogenic Belt, NW China

Zhang

Wang

et al. 2021

Front. Earth Sci.

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Several magmatic Cu–Ni sulfide deposits have recently been explored along the deep Middle Kunlun fault related to the extension of the East Kunlun orogenic belt in Qinghai Province, NW China. The Xiwanggou mafic–ultramafic rocks associated with Cu–Ni sulfide mineralization are first to be dated as late Permian compared to most of the deposits formed during late Silurian–early Devonian in this region. The Xiwanggou complexes located in the junction area between the East Kunlun and West Qinling belts, are composed of gabbros, olivine-gabbros, pyroxenites, olivine-pyroxenites, and peridotites. The Cu–Ni mineralization are mainly hosted in the olivine-pyroxenites and pyroxenites, whereas the sulfide-poor mineralization distributed in gabbros and olivine-gabbros. Zircon LA-ICP-MS U–Pb dating of the gabbro and olivine-pyroxenite revealed their crystallized ages of 250.8 ± 0.8 Ma and 257.3 ± 0.7 Ma, respectively. The trace element characteristics of the Xiwanggou fertile mafic-ultramafic rocks shows the enrichments in Sr, Rb, Th, Ba and light rare earth elements, and depletions in Nb and Ta, which are associated with the slab derived fluid input and dehydration melting of amphiboles. Meanwhile, Sr–Nd and Hf isotopic compositions of the gabbro [εNd(t) = 0.66–1.18; εHf(t) = 5.2–12] and olivine-pyroxenite [εNd(t) = −1.09 – −0.43; εHf(t) = 5.4–17.7] show that the magma was mainly derived from the metasomatized portions of subcontinental lithospheric mantle (SCLM) source in the mantle wedge. The magma primarily experienced dehydration melting processes of amphiboles and subsequently underwent hydrated melting in the overlying mantle wedge and relatively reduced background. The cool subduction process of the Anemaqen oceanic lithosphere maybe trigger large melting in the mantle wedge resulting in a relative low-Ni content in the melt. The transpressional windows formed by the right-lateral strike-slip shearing action of the Wenquan and South Kunlun faults in the South Kunlun forearc belt created a significant conduit for the magma ascending. The thermometer of Fe and Ni exchange between coexisting olivine and sulfide melt indicates the magma were yielded in a temperature range of ca. 1200–1300°C and an oxygen fugacity range of ca. –10.57 to –8.98 (log unit), which suggested that the parental magma of the Xiwanggou complex derived from a relatively reduced source favoring Ni relative to Fe in the melt. The intermediate sulfide segregation from the melt resulted in a medium tenor potential for the Xiwanggou complex.

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Geological characteristics, metallogenesis, and tectonic setting of porphyry–skarn Cu deposits in East Kunlun Orogen

Wang

Chen

et al. 2018

Geological Journal

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The East Kunlun Orogen (EKO), as the west segment of the Central China Orogen, is the most important Triassic polymetallic metallogenic belt in China. In this paper, we summarize the geological characteristics (stratigraphy, structure, ore‐related plutons, wall rock alteration, and orebodies), ore‐forming fluids and materials, geochronology, and petro‐geochemistry of the representative porphyry–skarn Cu–polymetallic deposits, including the Saishitang, Hutouya, and Kaerqueka deposits in the EKO. The porphyry–skarn Cu deposits in the EKO are mainly distributed in tectonic units of the Qimantagh Belt and the Elashan Belt. Among them, the skarn Cu deposits provide the majority of Cu resources, which mainly occur in the contact zone between the Triassic granitoids and the volcanic–sedimentary rocks (e.g., the Ordovician–Silurian Tanjianshan Group and the Early to Middle Triassic Hongshuichuan Group), and the skarn and orebodies are mainly controlled by interlayer–gliding structures. Ore‐forming fluids of the porphyry Cu deposits are magmatic mixed with meteoric water, whereas the fluids of skarn Cu deposits are mainly of magmatic origin. The higher δ18O (>10‰) of garnet and pyroxene in prograde skarn and wide range of sulphur isotopic compositions (δ34S values from −8.9‰ to 11.0‰) suggest that ore‐forming materials of skarn Cu deposits were partially derived from the country rocks. Based on detailed field investigations, we identified four Cu mineralization types, including veinlet–disseminated Cu (Mo, Au) mineralization occurring within the intrusions, proximal skarn Cu (Fe, Pb, Zn, Au) mineralization, distal skarn Cu mineralization, and distal skarn Pb–Zn (Cu) mineralization. The porphyry–skarn Cu deposits are associated with magmatism that occurred mainly during 235–218 Ma. The ore‐related granitoids are mostly calc‐alkaline I‐type granites, derived from partial melting of the Precambrian basement rocks with various degrees of involvement of mantle components. Combined with the regional tectonic evolution, we conclude that the Cu mineralization in the EKO began with the closure of A'nyemaqen Ocean (~238 Ma) and subsequently culminated in a postcollisional setting (~225 Ma).

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Ages, Sources and Tectonic Settings of the Triassic Igneous Rocks in the Easternmost Segment of the East Kunlun Orogen, central China

Cited by 29 publications

References 36 publications

Petrogenesis, Sources, and Tectonic Settings of Triassic Volcanic Rocks in the Ela Mountain Area of the East Kunlun Orogen: Insights from Geochronology, Geochemistry and Hf Isotopic Compositions

Petrogenesis, Sources, and Tectonic Settings of Triassic Volcanic Rocks in the Ela Mountain Area of the East Kunlun Orogen: Insights from Geochronology, Geochemistry and Hf Isotopic Compositions

Geodynamic Setting and Cu-Ni Potential of Late Permian Xiwanggou Mafic-Ultramafic Rocks, East Kunlun Orogenic Belt, NW China

Geological characteristics, metallogenesis, and tectonic setting of porphyry–skarn Cu deposits in East Kunlun Orogen

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