Architecture and P-T-deformation-time evolution of the Chinese SW-Tianshan HP/UHP complex: Implications for subduction dynamics

Tan, Zhou; Agard, Philippe; Monié, Patrick; Gao, Jun; John, Timm; Bayet, Léa; Jiang, Tuo; Wang, Xinshui; Hong, Tao; Wan, Bo; Caron, B.

doi:10.1016/j.earscirev.2019.102894

Cited by 42 publications

(23 citation statements)

References 113 publications

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“…We selected 10 pristine samples from different sequences within a subducted oceanic slab (2 metapelites, 5 metabasites, 3 serpentinites, Supplementary Table 1) to obtain a general picture of sulfur reservoirs. Mineral assemblages suggest that one metapelite reached low blueschistfacies conditions (300-400°C, 1.0-1.5 GPa), whereas the other metapelite (garnet-glaucophane-bearing) reached blueschistfacies conditions (400-500°C, 1.5-2.0 GPa) 27 . Metabasites with oceanic affinity are eclogites and blueschists (lawsonite relic identified) with peak metamorphic conditions clustering around 540°C and 2.5 ± 0.2 GPa 26 .…”

Section: Resultsmentioning

confidence: 99%

Uncovering and quantifying the subduction zone sulfur cycle from the slab perspective

Schwarzenbach

John

et al. 2020

Nat Commun

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Sulfur belongs among H 2 O, CO 2 , and Cl as one of the key volatiles in Earth's chemical cycles. High oxygen fugacity, sulfur concentration, and δ 34 S values in volcanic arc rocks have been attributed to significant sulfate addition by slab fluids. However, sulfur speciation, flux, and isotope composition in slab-dehydrated fluids remain unclear. Here, we use high-pressure rocks and enclosed veins to provide direct constraints on subduction zone sulfur recycling for a typical oceanic lithosphere. Textural and thermodynamic evidence indicates the predominance of reduced sulfur species in slab fluids; those derived from metasediments, altered oceanic crust, and serpentinite have δ 34 S values of approximately −8‰, −1‰, and +8‰, respectively. Mass-balance calculations demonstrate that 6.4% (up to 20% maximum) of total subducted sulfur is released between 30-230 km depth, and the predominant sulfur loss takes place at 70-100 km with a net δ 34 S composition of −2.5 ± 3‰. We conclude that modest slab-to-wedge sulfur transport occurs, but that slab-derived fluids provide negligible sulfate to oxidize the sub-arc mantle and cannot deliver 34 S-enriched sulfur to produce the positive δ 34 S signature in arc settings. Most sulfur has negative δ 34 S and is subducted into the deep mantle, which could cause a long-term increase in the δ 34 S of Earth surface reservoirs.

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Section: Resultsmentioning

confidence: 99%

Uncovering and quantifying the subduction zone sulfur cycle from the slab perspective

Schwarzenbach

John

et al. 2020

Nat Commun

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“…Two distinct domains within the South Tian Shan belt, separated by 500 km along strike, expose High Pressure (HP) rocks, which have similar timing and pressure-temperature conditions: the Atbashi range in Kyrgyzstan and the Kebuerte-Kekesu area in China (e.g. Klemd et al, 2005;Simonov et al 2008;Hegner et al 2010;Su et al, 2010;Li et al, 2011;Loury et al, 2018b;Tan et al, 2019). The pressure-temperature-time data are consistent with the end of oceanic subduction in the STS and thus the onset of accretion or collision between Tarim and the CAOB at 315-320 Ma (Hegner et al 2010, Loury et al, 2016.…”

Section: Formation Of the Belt During Sts Ocean Subductionmentioning

confidence: 99%

Thermochronology of the highest central Asian massifs (Khan Tengri - Pobedi, SE Kyrgyztan): Evidence for Late Miocene (ca. 8 Ma) reactivation of Permian faults and insights into building the Tian Shan

Rolland

Jourdon

Petit

et al. 2020

Journal of Asian Earth Sciences

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HAL is a multidisciplinary open access archive for the deposit and dissemination of scientific research documents, whether they are published or not. The documents may come from teaching and research institutions in France or abroad, or from public or private research centers. L'archive ouverte pluridisciplinaire HAL, est destinée au dépôt et à la diffusion de documents scientifiques de niveau recherche, publiés ou non, émanant des établissements d'enseignement et de recherche français ou étrangers, des laboratoires publics ou privés.

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“…The South Tianshan Belt is also considered to be an accretionary complex, which resulted from the subduction of the South Tianshan oceanic plate (Gao et al 1998(Gao et al , 2009aXiao et al 2013). Ophiolitic mélanges, numerous granitic intrusions and an ultrahigh pressure metamorphic belt, crop out along the northern margin of the South Tianshan (Gao and Klemd 2003;Gao et al 2011;Han et al 2011;Long et al 2011;Tan et al 2019;Zhang et al 2007Zhang et al , 2013. The ophiolitic mélange belts discontinuously occur in the Heiyingshan, Kumishi, Kulehu, Baleigong and Guluogou areas (Gao et al 2006;Han et al 2011;Jiang et al 2014;Wang et al 2011;Yang et al 2018).…”

Section: Geological Backgroundmentioning

confidence: 99%

“…The granitoid plutons in the South Tianshan intruded the northern margin of the Tarim Craton and are predominantly composed of syenites, two-mica peraluminous leucogranites and A-type rapakivi granites (Gao et al 2009a;Gou and Zhang 2016;Gou et al 2012Gou et al , 2015Long et al 2008Long et al , 2011. The HP/ UHP metamorphic belt is dominated by foliated metapelites, eclogites, blueschists and marbles (Gao and Klemd 2003;Tan et al 2019;Zhang et al 2007Zhang et al , 2013.…”

Section: Geological Backgroundmentioning

confidence: 99%

“…Complex subduction and accretion processes took place during the aforementioned period, producing massive Late Paleozoic magmatism in the western Chinese Tianshan, which is well recorded in a series of widespread Carboniferous volcanic rocks (XBGMR 1993). Previous studies suggested that they were formed in an intracontinental rift setting (Xia et al 2012;Xia and Li 2020), a continental arc setting (An et al 2013;Tang et al 2013;Wang et al 2007b;Yu et al 2016;Zhong et al 2017;Zhu et al 2009), a post-collisional setting (Chen et al 2020;Feng and Zhu 2019;Ge et al 2015;Long et al 2012;Sun et al 2008;Xiao et al 2010) or a back-arc extensional setting (Cao et al 2017;Qian et al 2006;Su et al 2018;Wang et al 2018aWang et al , b, 2019Yan et al 2015). Due to these controversial interpretations, their tectonic setting, and especially the implication that they have for the formation of the Kazakhstan Orocline, still warrant further elaboration.…”

Section: Introductionmentioning

confidence: 99%

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Carboniferous back-arc extension in the southern Yili-Central Tianshan Block and its significance to the formation of the Kazakhstan Orocline: insights from the Wusun Mountain volcanic belt

Cai

Sun

et al. 2021

Int J Earth Sci (Geol Rundsch)

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In Central Asia, the Carboniferous is a crucial period in the formation of the Tianshan Belt and associated bending of the Kazakhstan tectonic collage. In order to reveal Carboniferous magmatic events of the region and their tectonic implications, we conducted field investigations, zircon U-Pb dating, whole-rock geochemical and Sr-Nd isotopic studies on the Early Carboniferous Dahalajunshan Formation and Late Carboniferous Yishijilike Formation volcanic rocks of the Wusun Mountain Range (southern Yili-Central Tianshan Block). Volcanic rocks of the Dahalajunshan Formation consist of calc-alkaline basalt, andesite and dacite, yielding new zircon U-Pb ages of ~ 350 Ma. They have positive whole-rock ε Nd (t) values (+ 0.5 to + 1.6). In contrast, the Yishijilike Formation volcanic rocks dominantly comprise alkaline and calc-alkaline bimodal suites that erupted at ~ 337 Ma to 313 Ma and have higher whole-rock ε Nd (t) values (+ 2.3 to + 4.3). These two episodes of Carboniferous magmatism were correlated with partial melting of depleted mantle that metasomatized by slab-derived fluids. The late Carboniferous Wusun Mountain magmatic belt shows characteristics of a back-arc system that evolved due to trench retreat relative to the southern margin of the Yili-Central Tianshan Block. This mechanism induced an extensional regime with gradually depleting magma sources. The asymmetric retreat of the paleo-subduction zones of the South Tianshan Ocean and Junggar Ocean relative to the Yili-Central Tianshan Block was hence a vital driving force for the bending of the Kazakhstan Orocline.

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Architecture and P-T-deformation-time evolution of the Chinese SW-Tianshan HP/UHP complex: Implications for subduction dynamics

Cited by 42 publications

References 113 publications

Uncovering and quantifying the subduction zone sulfur cycle from the slab perspective

Uncovering and quantifying the subduction zone sulfur cycle from the slab perspective

Thermochronology of the highest central Asian massifs (Khan Tengri - Pobedi, SE Kyrgyztan): Evidence for Late Miocene (ca. 8 Ma) reactivation of Permian faults and insights into building the Tian Shan

Carboniferous back-arc extension in the southern Yili-Central Tianshan Block and its significance to the formation of the Kazakhstan Orocline: insights from the Wusun Mountain volcanic belt

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