Contrasting Early Palaeozoic provenance of the Yemaquan and Harlik arcs in the SW Altaids (NW China): identification of cryptic sutures in accretionary orogens

Li, Liang; Xiao, Wenjiao; Windley, Brian F.; Mao, Qigui; Jia, Xilai; Yang, He; Tan, Zhou; Sang, Miao; Gan, Jingmin; Abuduxun, Nijiati

doi:10.1080/00206814.2021.1992302

Cited by 10 publications

(6 citation statements)

References 66 publications

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“…Even though our mapping is not detailed enough, the accretionary complex origin of the Huangcaopo Group can be determined. Detrital provenance study carried by Long et al (2012) and Li et al (in press) on the early Palaeozoic parts of the Huangcaopo Group revealed two peaks at the early Neoproterozoic (922 Ma) and late Cambrian (488 Ma), showing striking affinity to the Tuva‐Mongolian microcontinent (Figure 12; Dong et al, 2018; Jiang et al, 2017; Long et al, 2007, 2010, 2012, 2020). This affinity gets further support from the identification of Silurian Tuvaella brachiopod fauna in those strata (Wang et al, 2019), which indicates that the Huangcaopo Group was deposited in the fore‐arc of the Yemaquan arc, part of the Kelameili accretionary complex.…”

Section: Discussionmentioning

confidence: 95%

“…Relative probability plots for detrital zircons of the nearly coeval strata from (a) Yanchi, East Junggar arc system (Li et al, in press); (b) Yanchi, East Junggar arc system (Long et al, 2012); (c) Mongolian Altai orogen (Jiang et al, 2017; Long et al, 2020); (d) Chinese Altai orogen (Dong et al, 2018; Long et al, 2007, 2010)…”

Section: Discussionmentioning

confidence: 99%

“…Early Carboniferous A‐type granitic and bimodal magmatism developed in the Qijiaojing area (Chen, Shu, Santosh, & Zhao, 2013; Zhang et al, 2017). Some authors suggested that these rocks were the products of backarc rifting of the Harlik‐Dananhu composite arc, but this conclusion requires re‐evaluation (Li et al, in press). Both southward and northward subduction of oceanic basins (various names were used, including the Kelameili Ocean) were proposed to be responsible for the construction of the Bogda arc or intra‐arc basin (Bai et al, 2020; Chen et al, 2013; Xie et al, 2016; Zhang et al, 2017).…”

Section: Regional Geology and Tectonic Backgroundmentioning

confidence: 99%

“…They underwent strong deformation and weak metamorphism, and parts of them have been transformed into phyllites or marbles (BGMRX, 1993). Those features indicate that they are most likely fore‐arc turbidites, considering that they crop out in south of the Daheishan ophiolite (southeast part of the Kelameili ophiolite belt), and have the Tuva‐Mongolian microcontinent affinity (Li et al, in press; Long et al, 2012). The recognition of the early Carboniferous strata in them indicates that they should be mainly the Carboniferous in age and coherent unit in nature like the situation in the Jiangjun area (Figure 2; Long et al, 2012; Xiao et al, 2009).…”

Section: Field Relationships and Petrologymentioning

confidence: 99%

“…(a) Simplified geological map of the northern Harlik Mountains (based on our mapping and provenance study by Long et al, 2012 and Li et al, in press)…”

Section: Field Relationships and Petrologymentioning

confidence: 99%

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Defining the Huangcaopo complex and gabbroic magmatism in the northern Harlik Mountains (NW China): Late Cambrian to latest Permian accretionary growth of the East Junggar Arc?

Xiao

Windley

et al. 2021

Geological Journal

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The Kelameili Ocean was one branch of the Palaeo‐Asian Ocean, the initiation and closure history of which remains elusive. Consequently, they hamper our understanding of the accretionary evolution of the southern Altaids. In this paper, we carried out field mapping and also geochronological and geochemical analyses on the Huangcaopo Group in the northern Harlik Mountains, NW China. Field investigation revealed that “block‐in‐matrix” structure develops with blocks of andesite, limestone, sandstone, and gabbro in matrices of turbidites. Combined with our recent work, our field investigation indicates that the Huangcaopo Group is the southern extension of the Kelameili accretionary complex. A gabbro block (19HAM057) was dated at 500 ± 4 Ma, its geochemical affinity was defined to be similar to arc magmatic rocks. Magmatisms represented by two gabbroic intrusions (19HAM057‐2 and 19HAM048) were dated at the latest Devonian (360 ± 5 Ma) and the latest Carboniferous (299 ± 4 Ma), respectively. Their geochemistry displays enrichments in light rare earth elements (LREE) and large ion lithophile elements (LILE), but depletions in high field strength elements (HFSE, especially Nb and Ta). And a younger gabbroic intrusion (19HAM052) yielded crystallization age of the latest Permian (254 ± 3 Ma), and its geochemistry also shows affinity to arc magmatism. The magmatism represented by the gabbro block (19HAM057) was coeval with the Zhaheba‐Aermantai ophiolite, indicating that it was the product of incipient arc magmatism following subduction initiation in the Kelameili branch of the Palaeo‐Asian Ocean. However, two episodes of gabbroic magmas (19HAM057‐2 and 19HAM048) that intruded the Kelameili accretionary complex from the latest Devonian to latest Carboniferous indicate southward rollback of the subducting Kelameili oceanic lithosphere and resulted in the development of a growing arc. Meanwhile, the youngest gabbroic intrusion (19HAM052) suggests that northward subduction of the Kelameili oceanic lithosphere may have at least lasted to the latest Permian, indicating that the closure of the Kelameili Ocean might have been later than the latest Permian, most likely in the early Triassic. Our new data provide further constraints on the initiation and closure history of the Kelameili Ocean, which shed light on the accretionary evolution of the Altaids.

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Section: Discussionmentioning

confidence: 95%

Section: Discussionmentioning

confidence: 99%

Section: Regional Geology and Tectonic Backgroundmentioning

confidence: 99%

Section: Field Relationships and Petrologymentioning

confidence: 99%

“…(a) Simplified geological map of the northern Harlik Mountains (based on our mapping and provenance study by Long et al, 2012 and Li et al, in press)…”

Section: Field Relationships and Petrologymentioning

confidence: 99%

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