Petrogenesis of Late Carboniferous-Early Permian mafic-ultramafic-felsic complexes in the eastern Central Tianshan, NW China: The result of subduction-related transtension?

Mao, Qigui; Ao, Songjian; Windley, Brian F.; Zhang, Zhiyong; Song, Dongfang; Zhang, Jien; Wan, Bo; Tan, Weishi; Han, Chunming; Xiao, Wenjiao

doi:10.1016/j.gr.2021.03.007

Cited by 13 publications

(6 citation statements)

References 85 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In addition, throughout the Yili-Central Tianshan there are widely exposed granitoids that intruded into pre-Permian igneous and sedimentary rocks (Figure 1B; Supplementary Table S1). These granitoids were previously interpreted to be: 1) post-collisional intrusions generated during lithospheric delamination (e.g., Ma et al, 2015;Wang et al, 2018a); 2) bodies genetically related to the Tarim mantle plume (e.g., Zhang and Zou, 2013); and 3) subduction-related magmatic rocks (Xiao et al, 2013;Mao et al, 2021).…”

Section: Geological Frameworkmentioning

confidence: 99%

Early Permian Syn-Subduction Extension in the South Tianshan (NW China): Insights From A-Type Granitoids in the Southern Altaids

et al. 2022

Self Cite

View full text Add to dashboard Cite

A-type granite is an important geodynamic indicator because it requires a high melting temperature that is commonly driven by extensional events. Here we report geochronology, whole-rock geochemistry, and zircon Lu-Hf isotopes of newly identified A-type granitic rocks from the South Tianshan in the southern Altaids. Zircon LA-ICP-MS ages indicate that the granitoids were emplaced at ca. 298–272 Ma. Geochemically, they are metaluminous to slightly peraluminous (A/CNK = 0.95–1.10), and belong to the high-K calc-alkaline to shoshonitic series. They are characterized by relatively high zircon saturation temperatures (824–875°C), K2O + Na2O contents (7.31–9.36%), high field strength elements (HFSE; Zr + Nb + Ce + Y = 365–802 ppm), and Ga/Al ratios (2.8–4.2), which all point to an A-type affinity. In addition, they have slightly enriched Hf isotope compositions (εHf(t) = −10.9 to + 0.6), and corresponding Mesoproterozoic (1,272–1759 Ma) crustal model ages, suggesting they were probably generated by partial melting of mature crust that contained minor mantle-derived magmatic material. The granitoids have distinctive subduction-related trace element signatures, with deep Nb and Ta troughs, elevated large ion lithosphere elements (LILEs), and flat HFSEs patterns, very similar to arc-derived granites in the Lachlan accretionary orogen. Integration of these new sedimentological, structural and geochronological results with relevant published information provides a new data-archive, which indicates that neither the Tarim mantle plume nor post-collisional extension can explain the genesis of these A-type granitoids. Instead, we propose a new more pertinent and robust model according to which they formed due to high temperature gradient in a subduction-related extensional setting probably triggered by southward rollback of the South Tianshan oceanic lithosphere, which caused upwelling of asthenospheric mantle combined with an increased temperature that led to large-scale crustal melting. This process gave rise to a broad magmatic arc in the southern active margin of the Yili-Central Tianshan. Our new data shed light on the retreating accretionary orogenesis of the southern Altaids in the Permian.

show abstract

Section: Geological Frameworkmentioning

confidence: 99%

Early Permian Syn-Subduction Extension in the South Tianshan (NW China): Insights From A-Type Granitoids in the Southern Altaids

et al. 2022

Self Cite

View full text Add to dashboard Cite

show abstract

“…Mafic-ultramafic rocks as mantle-derived magmas can be generated in various tectonic settings. In-depth analysis of mantle source compositions, physicochemical conditions for source partial melting, and magmatic processes of non-ophiolitic mafic-ultramafic could provide crucial insights into understanding the tectonic setting in which they were generated and further unraveling the tectonic evolutionary history of ancient orogenic belts [8][9][10][11][12][13][14][15]. Significant volumes of Late Carboniferous to Early Permian mafic-ultramafic rocks intruded in the eastern North Tianshan tectonic belt (NTB).…”

Section: Introductionmentioning

confidence: 99%

“…Significant volumes of Late Carboniferous to Early Permian mafic-ultramafic rocks intruded in the eastern North Tianshan tectonic belt (NTB). Many of these complexes exhibit Ni-Cu-(PGE) sulfide mineralization (Figure 1b; [7,13,16,17]). Although previous studies have investigated their ages, petrogenesis, tectonic settings, and mineralization mechanisms [13,[18][19][20], the geodynamic setting of these mafic-ultramafic rocks remains controversial.…”

Section: Introductionmentioning

confidence: 99%

“…Many of these complexes exhibit Ni-Cu-(PGE) sulfide mineralization (Figure 1b; [7,13,16,17]). Although previous studies have investigated their ages, petrogenesis, tectonic settings, and mineralization mechanisms [13,[18][19][20], the geodynamic setting of these mafic-ultramafic rocks remains controversial. Some researchers have proposed that they were generated by either oblique subduction or ridge subduction [10,13,18,[21][22][23].…”

Section: Introductionmentioning

confidence: 99%

“…Although previous studies have investigated their ages, petrogenesis, tectonic settings, and mineralization mechanisms [13,[18][19][20], the geodynamic setting of these mafic-ultramafic rocks remains controversial. Some researchers have proposed that they were generated by either oblique subduction or ridge subduction [10,13,18,[21][22][23]. Others have attributed the formation of these mafic-ultramafic complexes to magmatism induced by slab breakoff in a syn-or post-collisional tectonic setting [16,17,[24][25][26][27][28].…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

The Late Carboniferous Mafic–Ultramafic Complex Induced by Slab Breakoff in Eastern North Tianshan, Central Asian Orogenic Belt

Gao,

Cheng,

Guo

et al. 2023

Minerals

View full text Add to dashboard Cite

The Late Carboniferous to Early Permian is a critical period of the Chinese Tianshan, witnessing the tectonic transition from subduction to post-collisional extension during the final amalgamation of the Central Asian Orogenic Belt (CAOB). The late Carboniferous Mozbaysay mafic–ultramafic complex in the Qijiaojing–Balikun area, eastern North Tianshan, provides important clues for revealing the nature and timing of this tectonic transition. The Mozbaysay complex comprises mainly hornblende gabbros and lherzolites. LA-ICP-MS U-Pb zircon ages of hornblende gabbro yielded a weighted mean age of 306 ± 1.9 Ma for this complex. These mafic–ultramafic rocks have high contents of MgO (up to 30 wt.%), Cr (up to 2493 ppm), and Ni (up to 1041 ppm), but low contents of SiO2 (40.34–47.70 wt.%). They are enriched in LREE and show characteristics of enriched mid-ocean ridge basalts (E-MORB). The relatively high Th/Yb and Ba/Nb ratios imply the mantle sources could have been metasomatized by slab–mantle interaction with aqueous fluids from dehydration of the subducted slab. Thus, these mafic–ultramafic rocks were most likely produced by partial melting of the asthenospheric and lithospheric mantle with a slight influence of slab-derived fluids. Therefore, we suggest that the formation of these Late Carboniferous mafic–ultramafic rocks was triggered by the decompression-induced influx of asthenospheric heat and melting through a slab window during post-collisional slab breakoff. Combined with geological data, the petrogenetic links of the Late Carboniferous mafic–ultramafic rocks in eastern North Tianshan to slab breakoff suggest that the tectonic transition from convergence to post-collision most likely initiated in situ at ca. 306 Ma and lasted to ca. 300 Ma.

show abstract

Continental growth during Devono-Carboniferous switching accretionary tectonics: the Katebasu granitoid stock, Central Tianshan, NW China

Xing

Zhao

Xue

et al. 2021

Int J Earth Sci (Geol Rundsch)

View full text Add to dashboard Cite

Petrogenesis of Late Carboniferous-Early Permian mafic-ultramafic-felsic complexes in the eastern Central Tianshan, NW China: The result of subduction-related transtension?

Cited by 13 publications

References 85 publications

Early Permian Syn-Subduction Extension in the South Tianshan (NW China): Insights From A-Type Granitoids in the Southern Altaids

Early Permian Syn-Subduction Extension in the South Tianshan (NW China): Insights From A-Type Granitoids in the Southern Altaids

The Late Carboniferous Mafic–Ultramafic Complex Induced by Slab Breakoff in Eastern North Tianshan, Central Asian Orogenic Belt

Continental growth during Devono-Carboniferous switching accretionary tectonics: the Katebasu granitoid stock, Central Tianshan, NW China

Contact Info

Product

Resources

About