Petrogenesis and tectonic implication of the Late Triassic A1-type alkaline volcanics from the Xiangride area, eastern segment of the East Kunlun Orogen (China)

Zhu, Yu-Xiang; Wang, Lian-Xun; Ma, Changqian; He, Zuo-Xiang; Deng, Xin; Tian, Yang

doi:10.1016/j.lithos.2022.106595

Cited by 14 publications

(20 citation statements)

References 64 publications

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“…During the Late Permian to Middle Triassic (261–235 Ma), large volumes of granitoids (mainly I-type and subordinately S-type) were emplaced in the EKOB, − , but the timing of the tectonic transition from subduction to continental collision remains ambiguous. Two main hypotheses have been proposed: (1) the ocean closed in the Late Permian as indicated by the molasse deposits and angular unconformity, and (2) the initial continental collision occurred during the Early to Middle Triassic, based on various magmatic rock and sedimentary records. ,,, In the Late Triassic (235–210 Ma), the EKOB had evolved into a postcollisional extension setting, as evidenced by the emplacement of A-type granites (Figure a–c). ,, …”

Section: Discussionmentioning

confidence: 99%

“…(a) Histogram of zircon U–Pb ages of Permian-Triassic granites in the EKOB (the division of tectonic stages is based on Zhu et al (b) Distribution of Sr/Y and (c) (La/Yb) N and ratios of these granites for different crystallization ages. The kernel density plots (the blue background with different gradients) are obtained using the origin 2018 software, and the red dashed lines cover more than 98% of the data points.…”

Section: Discussionmentioning

confidence: 99%

“…2,3,27 Moreover, it has been demonstrated that the partial melting of these juvenile continental crust materials may be an essential mechanism for the flare-up of Late Triassic granites in the EKOB, which may indicate the maturation of the continental crust that occurred under postcollision extension (Figure 12a−c). 14,20,80…”

Section: Continental Crust Growth In the Syn-collisionalmentioning

confidence: 99%

“…13,16,17,50 In the Late Triassic (235−210 Ma), the EKOB had evolved into a postcollisional extension setting, as evidenced by the emplacement of A-type granites (Figure 11a−c). 26,62,80 The Sr/Y and (La/Yb) N ratios of granites are commonly used to infer the continental crust thickness and the tectonic evolution of orogenic belts, such as Gangdese 81 and Qinling 82 orogenic belts. We compiled the Sr/Y and (La/Yb) N ratios of 82 The geochronological data are listed in Table S10.…”

Section: Middle Triassic Continental Crustalmentioning

confidence: 99%

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Petrogenesis of Middle Triassic Mafic Enclaves and Host Granodiorite in the Eastern Kunlun Orogenic Belt, NW China: Implications for Continental Crust Growth in Syn-Collisional Setting

Li,

Gong,

Yan

et al. 2024

ACS Earth Space Chem.

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The mechanism of the Triassic continental crust growth in the East Kunlun Orogenic Belt (EKOB) is highly controversial. In this contribution, we present comprehensive data on the Yuegelu granodiorite and its mafic microgranular enclaves (MMEs) from the eastern segment of the EKOB, including zircon U−Pb geochronology and Hf isotope, mineral chemistry, whole-rock geochemistry and Sr−Nd isotopes, and in situ plagioclase Sr isotope, to constrain the genesis of these rocks and shed new insights on the continental crust growth. The MMEs are coeval with the host granodiorite at ∼240 Ma and display abundant quenching textures such as acicular apatites and quartz phenocrysts rimmed by amphibole. They typically exhibit low SiO 2 but high TiO 2 , Fe 2 O 3 T , MnO, and MgO concentrations and have similar Sr−Nd−Hf isotopic compositions to the host rock. We suggest that the Yuegelu MMEs are late cognate cumulates derived from the same parental magma with the host rock as a result of pressure quenching rather than the hybrids of crustal and mantle magmas. The granodiorite is medium-to high-K calcalkaline, metaluminous I-type granite with relatively high SiO 2 , but low Al 2 O 3 , CaO, and Fe 2 O 3 T contents. The granodiorite is enriched in Rb, K, and Pb but depleted in Nb, Ta, Sr, P, and Ti, resembling a bulk continental crust. However, Yuegelu granodiorite has much more depleted Sr−Nd−Hf isotopic compositions than those of the mature crustal materials, indicating a significant mantle contribution. Based on Sr−Nd isotopic modeling, the Yuegelu granodiorite could be generated by partial melting of the Paleo-Tethys Oceanic crust (∼80%) with the overlying terrigenous sediments (∼20%). The partial melting of oceanic crust fragments in the syn-collisional setting in the Middle Triassic contributed substantially to the continental crust growth in the EKOB.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Continental Crust Growth In the Syn-collisionalmentioning

confidence: 99%

Section: Middle Triassic Continental Crustalmentioning

confidence: 99%

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Petrogenesis of Middle Triassic Mafic Enclaves and Host Granodiorite in the Eastern Kunlun Orogenic Belt, NW China: Implications for Continental Crust Growth in Syn-Collisional Setting

Li,

Gong,

Yan

et al. 2024

ACS Earth Space Chem.

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“…The first model category calls for the dominance of OIB mantle‐derived materials. They include: (a) protracted fractional crystallization of alkali basaltic magmas with or without assimilation of silicic crust (Bonin, 2007; Eby, 1990; Loiselle & Wones, 1979; Namur et al, 2011; Zhu et al, 2022). The second category stresses the predominant role of crustal‐derived materials (Collins et al, 1982; Landenberger & Collins, 1996; Martin, 2006; Sequeira et al, 2022; Whalen et al, 1987).…”

Section: Discussionmentioning

confidence: 99%

Petrogenesis and tectonic implication of the alkaline ferroan granites from Ropp complex, north‐central Nigeria: Clues from zircon chemistry, U–Pb dating, and Lu–Hf isotope

et al. 2022

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Zircon holds crucial information for deciphering the origin of granitic rocks, enabling robust scrutiny of their magmatic evolution. Herein, we report an integrated whole‐rock and zircon U–Pb and Lu–Hf isotope chemistry of Ropp alkaline granites in north‐central Nigeria. The rock units include riebeckite‐biotite granite porphyries (161.1 ± 1.7 Ma), aegirine‐biotite granites (162.4 ± 1.6 Ma), biotite granites (162.3 ± 5.1 Ma), and albite riebeckite granites. They show diagnostic characteristics of ferroan alkaline granites such as high FeOt/(FeOt + MgO), low Y/Nb (<1.2), and high Nb/Y (>1.0). Their zircon Hf isotopic compositions (εHf(t) = −8.08 to −4.38; 176Hf/177Hf = 0.282492–0.282543), major and trace element compositions such as high SiO2 >70% and incompatible trace elements (e.g., Rb, Ba, and La), low ratios of whole rock Th/U, Hf/Ta. Ni/Co and Th/Ta = 2.82, and zircon U/Yb, Gd/Yb, and Th/Yb ratios as well as oxygen fugacity (logfO2 = −26.09 to −12.32) reflect protracted fractional crystallization of a highly reduced mantle‐derived oceanic island basalt (OIB) magma from EM2 with considerable crustal involvement. Magma evolution was fuelled by fractionation of calcic‐pyroxene, calcic‐amphibole, Mg‐olivines, feldspars, titanite, and apatite, as corroborated by the marked depletions of CaO, MgO, TiO2, and P2O5. Intense crustal assimilation, particularly in the biotite granite masked their enriched mantle (EM) ancestry. This is attested by the presence of inherited Pan‐African (ca. 582 Ma) zircon, elevated crustal‐like zircon U/Yb, low zircon Gd/Yb, and Th/Yb ratios as well as high whole‐rock Rb/Nb ratios and relatively low estimated temperatures, which mimic crustal‐derived granites. Reactivation of pre‐existing megashear zones of weaknesses and opening of related transcurrent faults following periodic plate movements generated intense stress field which invoked the release of pressure and hot metasomatic fluids that partially melted the lower EM, giving rise to the Ropp OIB magmas.

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Termination of anorogenic alkaline magmatism in Nigerian Younger Granite province: insights from Afu A-type granite complex

Cao,

Wang,

Zhu

et al. 2024

Int J Earth Sci (Geol Rundsch)

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Petrogenesis and tectonic implication of the Late Triassic A1-type alkaline volcanics from the Xiangride area, eastern segment of the East Kunlun Orogen (China)

Cited by 14 publications

References 64 publications

Petrogenesis of Middle Triassic Mafic Enclaves and Host Granodiorite in the Eastern Kunlun Orogenic Belt, NW China: Implications for Continental Crust Growth in Syn-Collisional Setting

Petrogenesis of Middle Triassic Mafic Enclaves and Host Granodiorite in the Eastern Kunlun Orogenic Belt, NW China: Implications for Continental Crust Growth in Syn-Collisional Setting

Petrogenesis and tectonic implication of the alkaline ferroan granites from Ropp complex, north‐central Nigeria: Clues from zircon chemistry, U–Pb dating, and Lu–Hf isotope

Termination of anorogenic alkaline magmatism in Nigerian Younger Granite province: insights from Afu A-type granite complex

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