Magmatic evolution of the Tuwu–Yandong porphyry Cu belt, NW China: Constraints from geochronology, geochemistry and Sr–Nd–Hf isotopes

Xiao, Bing; Chen, Hong‐Yuan; Hollings, Pete; Han, Jinsheng; Wang, Yunfeng; Yang, Juntao; Cai, Keda

doi:10.1016/j.gr.2015.09.003

Cited by 123 publications

(50 citation statements)

References 77 publications

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“…Considering Hf isotopes, active margin‐related magmatism typically shows both positive and negative εHf(t) values (DeCelles et al, ; Mišković & Schaltegger, ). Therefore, in situ zircon Hf isotopes provide us with another opportunity to discriminate zircons from these contemporaneous magmatic environments (Figure ; the Dananhu Arc (Sun et al, ; Wang & Zhang, ; Wang, Xue, Wang, et al, , Wang, Xue, Liu, et al, , Wang, Zhang, & Liu, , Wang, Zhang, Liu, & Que, ; Xiao et al, ; Zhang, Wang, & Liu, ) and the Central Tianshan Arc (Huang et al, ; Lei et al, , ; Li et al, ; Li et al, ; Ma et al, , ; Nijat et al, ; Shi et al, ; Xu et al, ; Yang et al, ; Zhang et al, , Zhang, Zhao, Eizenhöfer, et al, , b; Zhu et al, )). The εHf(t) values for the Dananhu Arc are mostly >11, whereas the εHf(t) values for the Central Tianshan Arc are generally <11, and they have both positive and negative values.…”

Section: Discussionmentioning

confidence: 99%

“…This method is applicable because previous studies have demonstrated there is a significant difference in the isotopic signatures of Paleozoic magmatism between the Dananhu Arc and the Central Tianshan Arc. The Dananhu Arc is characterized by isotopically juvenile Paleozoic magmatism (Wang et al, ; Wang & Zhang, ; Xiao et al, ; Zhang et al, ), whereas the isotopic characters of the Paleozoic magmatic records from the Central Tianshan Arc are mixed (Huang et al, ; Liu et al, ; Ma et al, ; Zhang, Zhao, Eizenhöfer, et al, ). In addition, it is notable that the Central Tianshan Arc possesses a distinct zircon age cluster around 1,400–1,600 Ma, which is absent in other nearby Precambrian blocks, such as Tarim in the south, and the Tuva‐Mongolia in the north (Long & Huang, ; Zhang, Zhao, Sun, et al, ).…”

Section: Introductionmentioning

confidence: 99%

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Composition, Provenance, and Tectonic Setting of the Southern Kangurtag Accretionary Complex in the Eastern Tianshan, NW China: Implications for the Late Paleozoic Evolution of the North Tianshan Ocean

et al. 2019

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The Kangurtag belt in the Eastern Tianshan, connecting the Dananhu Arc with the Central Tianshan Arc, contains diagnostic rocks of accretionary origin, and thus provides key information about the evolution of the North Tianshan Ocean. The Southern Kangurtag belt is composed of two types of mélange. Type I mélange consists of Enriched Mid‐Ocean Ridge Basalt‐type pillow basalts, draped by biohermal limestones and carbonate‐siliceous sediments of a slope facies, and siliceous argillites from a hemipelagic‐pelagic environment that together make up a seamount assemblage. In Type II mélange, Normal Mid‐Ocean Ridge Basalt and ribbon cherts were dismembered and entrained in a clastic matrix, showing a “block‐in‐matrix” structure. Detrital zircons of four sandstones from Devonian and Carboniferous strata within the mélanges have a predominant age population of 410–430 Ma and a distinct Proterozoic cluster around 1.4–1.6 Ga. The εHf(t) values of Phanerozoic zircons range from −25.1 to +8.6. Such age patterns, typical of the Central Tianshan Arc, and the Hf isotopic data indicate that these sedimentary successions were deposited on the northern margin of the Central Tianshan Arc. The youngest detrital zircon age of 317 Ma provides an upper limit for the time of formation of the Southern Kangurtag accretionary complex. Therefore, we suggest that the Southern Kangurtag belt comprises an accretionary complex that developed during southward subduction of the North Tianshan Ocean beneath the Central Tianshan Arc. This subduction began in the Early Ordovician and may have lasted until the Late Carboniferous–Permian.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Composition, Provenance, and Tectonic Setting of the Southern Kangurtag Accretionary Complex in the Eastern Tianshan, NW China: Implications for the Late Paleozoic Evolution of the North Tianshan Ocean

et al. 2019

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“…The Palaeozoic magmatism was enriched in largeion lithophile elements (LILE) and highly incompatible elements and was depleted in highfieldstrength elements (HSFE; Wang et al, ; Wang & Zhang, ; Zhang et al, ). Notably, the Nd and Hf isotopic data of the Palaeozoic magmatism indicate a juvenile isotopic source (Sun, Luan, Tang, & Tan, ; Sun et al, ; Wang et al, ; Wang et al, ; Wang, Xue, Liu, et al, ; Wang, Xue, Wang, et al, ; Wang & Zhang, ; Wang, Zhang, & Liu, ; Wang, Zhang, Liu, & Que, ; Xiao et al, ). Overall, the geochemical and depleted isotopic character of the magmatism of the Dananhu arc suggests generation in a subduction‐related intraoceanic arc system (Gill, ; Stern, ).…”

Section: Geological Backgroundmentioning

confidence: 99%

Latest Permian–early Triassic arc amalgamation of the Eastern Tianshan (NW China): Constraints from detrital zircons and Hf isotopes of Devonian–Triassic sediments

et al. 2019

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The temporal–spatial framework of arc amalgamation is an important key for understanding the anatomy of orogenic collages, present and past. The Junggar‐Balkhash Ocean was a major branch of the southern Paleo‐Asian Ocean where several arcs were amalgamated. Among them, the Dananhu arc with its characteristic juvenile magmatism and lack of Precambrian basement is an efficient recorder of the evolutional history. From our U–Pb and Lu–Hf isotopic analyses of Devonian to Triassic sediments in the Dananhu arc and Permian sediments in the Yamansu‐Central Tianshan arc, we discovered two major changes in detrital zircon provenance of the Dananhu arc: (a) An increasing input of Precambrian ages from the Mongolia collage at 850, 1,850, and 2,500 Ma, together with Phanerozoic zircons ranging from 420 to 480 Ma with negative εHf(t) value since ca. 288 Ma; (b) the presence of the Yamansu‐Central Tianshan arclike Precambrian age cluster of 1,400–1,600 Ma around 243 Ma. In combination with regional tectonothermal events, these two changes correspond to the formation of the Harlik‐Dananhu composite arc in the latest Carboniferous–early Permian followed by its collision with the Yamansu‐Central Tianshan arc in the latest Permian–early Triassic, which marks the termination of the eastern Junggar‐Balkash Ocean. Analysis of the sedimentary successions within the intraoceanic arcs sheds light on the amalgamation history of the Central Asian Orogenic Belt.

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“…The samples of the metagabbro have low SiO 2 and REEs content, high MgO, Mg#, Ni and Cr content and have no correlation in the diagrams of Nb/La vs. SiO 2 (Supplementary Materials Figure S1), indicating that the rocks did not experience substantial crustal contamination during magmatic evolution [68][69][70]. This interpretation is also supported by the following lines of evidence: (1) The metagabbro has similar zircon εHf(t) values and common features of most major and trace elements (Figures 4 and 5a,b); (2) Lu/Yb ratios of our samples generally range from 0.14-0.15, which is consist with that of mantle-derived magmas (0.14-0.15) and is lower than that of continental crust (0.16-0.18) [71]; and (3) absence of ancient captured zircons does not support significant crustal contamination [72].…”

Section: Meta-mafic Rocksmentioning

confidence: 99%

Paleoproterozoic Multiple Tectonothermal Events in the Longshoushan Area, Western North China Craton and Their Geological Implication: Evidence from Geochemistry, Zircon U–Pb Geochronology and Hf Isotopes

et al. 2018

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Abstract:The Alxa block is located in the southwestern margin of the North China Craton. The Paleoproterozoic tectonic evolution, crustal growth and tectonic affinity of the block remain unknown or controversial. The Longshoushan (LS) area is one of the few areas that outcrop Paleoproterozoic to crystalline basement rocks in the Alxa Block. In this study, we preset whole-rock geochemistry, zircon U-Pb geochronology and Lu-Hf isotope data from metagabbro, metadiorite, quartz syenite, granitic leucosome and pegmatoid leucosome in the LS area. These rocks all are enriched in LREE and LILE, and depleted in HREE and HFSE. Eight new LA-ICP-MS zircon U-Pb ages yielded three magmatic ages of 2044 Ma, 2029 Ma and 1940 Ma, and three metamorphic ages of 1891 Ma, 1848 Ma and 1812 Ma. Lu-Hf analyses reveal that the magmatic zircons and anatectic/metamorphic zircons from all the rock types are characterized by positive εHf(t) (−0.16 to 10.89) and variable εHf(t) (−11.21 to 6.24), respectively. Based on the previous studies and our new data, we conclude that the LS area experienced three magmatic events (2.5-2.45 Ga, 2.1-2.0 Ga and~1.95-1.91 Ga) and three regional metamorphism/anataxis events (~1.93-1.89 Ga, 1.86-1.84 Ga and~1.81 Ga) in Paleoproterozoic. The age-Hf isotope data establishes two main crustal growth events at~2.9-2.5 Ga and~2.2-2.0 Ga in the LS area. These data indicate that the LS area experienced intraplate extensional setting in the middle Paleoproterozoic, and continental subduction, collision and exhumation in the late Paleoproterozoic. Combining the geochronological framework and tectonic evolution, we suggest that the Alxa Block is part of the Khondalite Belt.

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Magmatic evolution of the Tuwu–Yandong porphyry Cu belt, NW China: Constraints from geochronology, geochemistry and Sr–Nd–Hf isotopes

Cited by 123 publications

References 77 publications

Composition, Provenance, and Tectonic Setting of the Southern Kangurtag Accretionary Complex in the Eastern Tianshan, NW China: Implications for the Late Paleozoic Evolution of the North Tianshan Ocean

Composition, Provenance, and Tectonic Setting of the Southern Kangurtag Accretionary Complex in the Eastern Tianshan, NW China: Implications for the Late Paleozoic Evolution of the North Tianshan Ocean

Latest Permian–early Triassic arc amalgamation of the Eastern Tianshan (NW China): Constraints from detrital zircons and Hf isotopes of Devonian–Triassic sediments

Paleoproterozoic Multiple Tectonothermal Events in the Longshoushan Area, Western North China Craton and Their Geological Implication: Evidence from Geochemistry, Zircon U–Pb Geochronology and Hf Isotopes

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