Mesoproterozoic juvenile crust in microcontinents of the Central Asian Orogenic Belt: evidence from oxygen and hafnium isotopes in zircon

He, Zhenyu; Klemd, Reiner; Yan, Li-Li; Lu, Tianyu; Zhang, Zeming

doi:10.1038/s41598-018-23393-4

Cited by 41 publications

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“…In fact, ca. 1.4 Ga magmatism has been widely documented in microcontinent blocks of the CAOB, including the Central Tianshan Block (He, Klemd, et al, 2015; He, Klemd, Yan, Lu, & Zhang, 2018; Hu et al, 2006), southern Beishan (He, Sun, et al, 2015; Yuan et al, 2019), Southern Mongolia (Demoux et al, 2009), and the Xilinhot Block (Han et al, 2017) but is rare in the Alxa Block and NCC. Therefore, the ZSZ may be an exotic block accreted to the northern margin of the Alxa Block.…”

Section: Discussionmentioning

confidence: 99%

Late Paleozoic Tectonic Evolution of the Paleo‐Asian Ocean in the Northern Alxa Block (NW China)

et al. 2020

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The northern Alxa Block occupies a key position in the southern margin of the Central Asian Orogenic Belt (CAOB) and records late Paleozoic subduction and closure processes of the Paleo‐Asian Ocean (PAO). However, there are still controversies regarding the timing and location of the final closure of the PAO. This study presents structural deformation data and geochronological and geochemical data for Permian volcanic rocks, as well as detrital zircon provenance analysis of Permian sedimentary rocks along the Nuoergong‐Langshan Zone (NLZ) in the northern Alxa Block. During the early to middle Permian, the PAO lithospheric slab subducted beneath the northern Alxa Block, rendering a continental volcanic arc in the NLZ and also giving rise to extensive folding, thrusting, and crustal thickening. The crustal thickening in the NLZ may trigger the early Permian magmatic flare‐up that constructed much of the continental arc plutons. In the middle to late Permian, a retroarc foreland basin was formed, within which the Dahongshan Formation deposited. Significant active tectonic movements led to regional unconformity occurring during this period. A large‐scale dextral ductile shear deformation in the NLZ resulting from the lateral extrusion of the thickened crust after the terminal amalgamation of the southern CAOB was constrained between 272 and 249 Ma, suggesting a late Permian tectonic transition from compression to transpression. Combining these findings with published data, we suggest that the final consumption of the PAO occurred in the late Permian, probably along the Enger Us suture zone in the northern margin Alxa Block.

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Section: Discussionmentioning

confidence: 99%

Late Paleozoic Tectonic Evolution of the Paleo‐Asian Ocean in the Northern Alxa Block (NW China)

et al. 2020

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“…The depleted mantle Hf model ages (T DM ) were calculated using the depleted mantle values with a present-day 176 Lu/ 177 Hf = 0.0384 and 176 Hf/ 177 Hf = 0.28325 (Griffin et al, 2000). Due to the absence of the 176 Lu/ 177 Hf ratio of the magma, we adopted a crustal model age (T DMC ) using the 176 Lu/ 177 Hf ratio of 0.0125 for an average continental crust (Chauvel et al, 2014; also see He, Klemd, Yan, Lu, & Zhang, 2018).…”

Section: Methodsmentioning

confidence: 99%

“…The zircon Hf isotopic compositions of the studied granitic rocks are radiogenic, which plot above or near the region of the crustal basement of the CTM (Figure 10; He et al, 2015;He, Klemd, Yan, Lu, & Zhang, 2018), indicating that the granitic magma was derived from an isotopically depleted mantle, rather than the crustal basement of the CTM. Furthermore, their zircon ε Hf (t) values show a large variation (with 5 ε Hf units for the granodiorite and 13 ε Hf units for the monzogranite; Table 2), which is consistent with open-system magma chamber processes at the crustal level (Griffin, Wang, Jackson, Pearson, & O'Reilly, 2002;Kemp et al, 2007;Qin, Lai, Diwu, Ju, & Li, 2010;Yang et al, 2007).…”

Section: Zircon Hf Isotopic Compositionsmentioning

confidence: 99%

“…Among several tectonic units in the Chinese Eastern Tianshan, the Central Tianshan is a microcontinental terrane characterized by Precambrian crustal basements Hu, Jahn, Zhang, Chen, & Zhang, 2000;Liu, Guo, Zhang, Li, & Zheng, 2004). The Mesoproterozoic juvenile crustal growth has been well documented and provided robust evidence for the microcontinental nature of the Central Tianshan He, Klemd, Yan, Lu, & Zhang, 2018;. Recently, intensive Palaeozoic granitic rocks have been recognized from the Central Tianshan microcontinent (CTM).…”

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confidence: 99%

“…Data sources of Palaeozoic magmatic rocks from the CTM are listed inTable S1. The crustal evolution region of the CTM is fromHe, Klemd, Yan, Lu, and Zhang (2018). CTM, Central Tianshan microcontinent [Colour figure can be viewed at wileyonlinelibrary.com] Age histogram of the Palaeozoic magmatic rocks from the Central Tianshan microcontinent.…”

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Late Carboniferous crustal evolution of the Chinese Central Tianshan microcontinent: Insights from zircon U–Pb and Hf isotopes of granites

Wen

2020

Geological Journal

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The Central Tianshan microcontinent (CTM) in the southern Central Asian Orogenic Belt is characterized by Precambrian crustal basements and widespread Palaeozoic granitic rocks. However, the Palaeozoic tectonic process and associated crustal evolution of the CTM have not been well constrained. In this paper, we report whole‐rock geochemistry, zircon U–Pb ages, Hf isotopes, and trace elements for the Late Carboniferous granodiorite and monzogranite from the Hongliujingbei area of the eastern CTM. These data were further integrated with previously published whole‐rock geochemistry and zircon Hf isotopic data of the intensive Late Carboniferous (327–300 Ma) magmatic rocks in the CTM in order to gain more insights into the crustal and tectonic evolution of the CTM during the Late Carboniferous. LA‐ICP‐MS zircon U–Pb dating results indicate that the granodiorite and monzogranite from the Hongliujingbei area were emplaced at ~320 Ma. Their highly variable zircon εHf(t) values (−0.1 to +12.9) suggest that the magmas of these rocks were formed by the mixing of mantle‐ and crustal‐derived magmas. The Late Carboniferous magmatic rocks from the CTM, as a whole, show a wide range of zircon εHf(t) values (−3.7 to +13.4) and geochemical characteristics typical for magma evolution in an active continental margin setting. Therefore, we suggest that the Late Carboniferous magmatic rocks in the CTM were probably generated in a continental arc formed by the southward subduction of the North Tianshan Ocean Plate beneath the CTM, and their mostly depleted zircon Hf isotopic compositions indicate that juvenile crustal growth was a dominant process in the CTM during the Late Carboniferous.

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Age, depositional environment, and tectonic significance of an Early Neoproterozoic volcano‐sedimentary sequence in the eastern Beishan orogenic belt, southern Central Asian Orogenic Belt

Wang

Yang

et al. 2020

Geological Journal

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The Beishan orogenic belt, located in the southern Central Asian Orogenic Belt, includes several discrete arc terranes. Here, we report on a newly discovered Early Neoproterozoic volcano‐sedimentary sequence in the eastern Beishan orogenic belt in order to constrain the composition and origin of the Shuangyingshan‐Huaniushan Terrane. The ~766‐m‐thick volcano‐sedimentary sequence is very low‐grade metamorphosed, and characterized by muddy and silty slate with the well‐developed parallel laminations and minor thinly‐bedded limestone in its lower and upper sections, and thick packages of sandstone‐conglomerate and basaltic rocks in the middle section. Lava flow units in the basalt are very common, and the sandstone‐conglomerate exhibits sedimentary structures typical of gravity currents, including erosional and slump features, and Bouma sequences. These features suggest that syn‐sedimentary volcanism occurred and the sequence formed in an active, deep marine environment. The basalt has a zircon U–Pb age of 901 ± 10 Ma, indicating that this sequence formed during the Early Neoproterozoic. Basalt samples have moderate SiO2 (45.33–49.18%), and high TiO2 (1.27–4.04%) contents, Mg# values of 25–48, and plot in the alkali basalt field in the Nb/Y versus Zr/TiO2 diagram, indicative of an evolved alkali basalt magma. They show inclined chondrite‐normalized REE patterns with (La/Yb)N ratios of 4.74–6.53, no pronounced negative Eu anomalies (Eu/Eu* = 0.87–1.22), no obvious negative Zr, Hf, Nb, and Ta anomalies in the primitive‐mantle‐normalized trace‐element diagram, consistent with oceanic island basalts. Considered together, these lithologies resemble those of an oceanic seamount. Our results, and the presence of the previously reported Gubaoquan granitic and mafic rocks (905–865 Ma) that formed in an active continental margin setting and underwent an amphibolite‐facies metamorphism, suggest that the Shuangyingshan‐Huaniushan Terrane may be an accreted terrane that consists of different lithologies with various origins that formed during the Neoproterozoic.

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Mesoproterozoic juvenile crust in microcontinents of the Central Asian Orogenic Belt: evidence from oxygen and hafnium isotopes in zircon

Cited by 41 publications

References 47 publications

Late Paleozoic Tectonic Evolution of the Paleo‐Asian Ocean in the Northern Alxa Block (NW China)

Late Paleozoic Tectonic Evolution of the Paleo‐Asian Ocean in the Northern Alxa Block (NW China)

Late Carboniferous crustal evolution of the Chinese Central Tianshan microcontinent: Insights from zircon U–Pb and Hf isotopes of granites

Age, depositional environment, and tectonic significance of an Early Neoproterozoic volcano‐sedimentary sequence in the eastern Beishan orogenic belt, southern Central Asian Orogenic Belt

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