Late Cryogenian Circum-Rodinia Syn-Subduction Extension: Insights from Highly Fractionated S-Type and A-Type Granitoids in the Northern Tarim Craton
Late Cryogenian–Ediacaran magmatism represents the latest Precambrian tectonothermal event in the Tarim Craton. However, its geodynamic setting and geological significance are controversial. Here, we report the geochronology, whole-rock geochemistry, and Sr-Nd-Hf isotopic compositions of newly ident...
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MDPI AG
2023-11-01
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| Series: | Minerals |
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| author | Talifeng Biedilihan Nijiati Abuduxun Peng Huang Jingmin Gan Yilidan’na Talati |
| author_facet | Talifeng Biedilihan Nijiati Abuduxun Peng Huang Jingmin Gan Yilidan’na Talati |
| author_sort | Talifeng Biedilihan |
| collection | DOAJ |
| description | Late Cryogenian–Ediacaran magmatism represents the latest Precambrian tectonothermal event in the Tarim Craton. However, its geodynamic setting and geological significance are controversial. Here, we report the geochronology, whole-rock geochemistry, and Sr-Nd-Hf isotopic compositions of newly identified late Cryogenian A-type and highly fractionated S-type granites from two locations in the northern Tarim Craton. LA-ICP-MS zircon U-Pb analyses yield ages of 642 ± 7 Ma for a syenogranite and 643 ± 4.5 Ma for a mylonitized granite. The syenogranite is weakly peraluminous and shows an A-type granite affinity, as indicated by its high K<sub>2</sub>O + Na<sub>2</sub>O contents (8.35–8.64 wt.%), high field strength elements (Zr + Nb + Ce + Y = 435.8 − 463.4 × 10<sup>−6</sup>), Ga/Al ratios (2.79−2.83), and zircon saturation temperatures (829–844 °C). In contrast, the mylonitized granite contains Al-oversaturated minerals (e.g., garnet) and has high a differentiation index (DI = of 98.9–99.4), with lower zircon saturation temperatures (786–792 °C); the samples display high SiO<sub>2</sub> contents (72.99–74.00 wt.%) and A/CNK values (1.16–1.17) and low Nb/Ta and Zr/Hf ratios and are enriched in Rb and depleted in Ba, Sr, which all point to a highly fractionated S-type granite affinity. The granites are characterized by elevated large-ion lithosphere elements (LILEs) and flat high-field-strength elements (HFSEs) patterns, with deep Nb and Ta troughs and pronounced negative Eu anomalies (Eu/Eu* = 0.17–0.38). They show apparently negative <i>ε</i><sub>Nd</sub>(t) values (−10.1 to −9.8 and −6.8 to −7.9, respectively) and <i>ε</i><sub>Hf</sub>(t) values (−9.66 to −1.77 and −33.5 to −1.3, respectively) with Paleoproterozoic crustal model ages, indicating that they were mainly generated by the partial melting of mature crustal materials with a minor contribution from a mantle-derived magmatic source. By integrating with previously published geological, sedimentological, and structural data, we suggest that the granites formed due to a high-temperature gradient in a syn-subduction extensional setting that was probably induced by northward slab rollback of the Paleo-Asian Oceanic lithosphere. Our new data highlight an upper-plate extension in the northern Tarim Craton that constitutes the northern periphery of the Rodinia supercontinent. The linear distribution of late Cryogenian magmatic rocks provides critical evidence for the orogen strike extension of the terminal suture between the Tarim Craton and southwestern Altaids. |
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| spelling | doaj.art-58a6ac62a1ea4071ade466d3c07250cb2023-11-24T14:57:42ZengMDPI AGMinerals2075-163X2023-11-011311144610.3390/min13111446Late Cryogenian Circum-Rodinia Syn-Subduction Extension: Insights from Highly Fractionated S-Type and A-Type Granitoids in the Northern Tarim CratonTalifeng Biedilihan0Nijiati Abuduxun1Peng Huang2Jingmin Gan3Yilidan’na Talati4Xinjiang Key Laboratory for Geodynamic Processes and Metallogenic Prognosis of the Central Asian Orogenic Belt, School of Geology and Mining Engineering, Xinjiang University, Urumqi 830046, ChinaXinjiang Key Laboratory for Geodynamic Processes and Metallogenic Prognosis of the Central Asian Orogenic Belt, School of Geology and Mining Engineering, Xinjiang University, Urumqi 830046, ChinaXinjiang Key Laboratory of Mineral Resources and Digital Geology, Xinjiang Research Centre for Mineral Resources, Chinese Academy of Sciences, Urumqi 830011, ChinaXinjiang Key Laboratory of Mineral Resources and Digital Geology, Xinjiang Research Centre for Mineral Resources, Chinese Academy of Sciences, Urumqi 830011, ChinaXinjiang Key Laboratory for Geodynamic Processes and Metallogenic Prognosis of the Central Asian Orogenic Belt, School of Geology and Mining Engineering, Xinjiang University, Urumqi 830046, ChinaLate Cryogenian–Ediacaran magmatism represents the latest Precambrian tectonothermal event in the Tarim Craton. However, its geodynamic setting and geological significance are controversial. Here, we report the geochronology, whole-rock geochemistry, and Sr-Nd-Hf isotopic compositions of newly identified late Cryogenian A-type and highly fractionated S-type granites from two locations in the northern Tarim Craton. LA-ICP-MS zircon U-Pb analyses yield ages of 642 ± 7 Ma for a syenogranite and 643 ± 4.5 Ma for a mylonitized granite. The syenogranite is weakly peraluminous and shows an A-type granite affinity, as indicated by its high K<sub>2</sub>O + Na<sub>2</sub>O contents (8.35–8.64 wt.%), high field strength elements (Zr + Nb + Ce + Y = 435.8 − 463.4 × 10<sup>−6</sup>), Ga/Al ratios (2.79−2.83), and zircon saturation temperatures (829–844 °C). In contrast, the mylonitized granite contains Al-oversaturated minerals (e.g., garnet) and has high a differentiation index (DI = of 98.9–99.4), with lower zircon saturation temperatures (786–792 °C); the samples display high SiO<sub>2</sub> contents (72.99–74.00 wt.%) and A/CNK values (1.16–1.17) and low Nb/Ta and Zr/Hf ratios and are enriched in Rb and depleted in Ba, Sr, which all point to a highly fractionated S-type granite affinity. The granites are characterized by elevated large-ion lithosphere elements (LILEs) and flat high-field-strength elements (HFSEs) patterns, with deep Nb and Ta troughs and pronounced negative Eu anomalies (Eu/Eu* = 0.17–0.38). They show apparently negative <i>ε</i><sub>Nd</sub>(t) values (−10.1 to −9.8 and −6.8 to −7.9, respectively) and <i>ε</i><sub>Hf</sub>(t) values (−9.66 to −1.77 and −33.5 to −1.3, respectively) with Paleoproterozoic crustal model ages, indicating that they were mainly generated by the partial melting of mature crustal materials with a minor contribution from a mantle-derived magmatic source. By integrating with previously published geological, sedimentological, and structural data, we suggest that the granites formed due to a high-temperature gradient in a syn-subduction extensional setting that was probably induced by northward slab rollback of the Paleo-Asian Oceanic lithosphere. Our new data highlight an upper-plate extension in the northern Tarim Craton that constitutes the northern periphery of the Rodinia supercontinent. The linear distribution of late Cryogenian magmatic rocks provides critical evidence for the orogen strike extension of the terminal suture between the Tarim Craton and southwestern Altaids.https://www.mdpi.com/2075-163X/13/11/1446syn-subduction extensionS-type graniteA-type granitelate Cryogeniannorthern Tarim |
| spellingShingle | Talifeng Biedilihan Nijiati Abuduxun Peng Huang Jingmin Gan Yilidan’na Talati Late Cryogenian Circum-Rodinia Syn-Subduction Extension: Insights from Highly Fractionated S-Type and A-Type Granitoids in the Northern Tarim Craton Minerals syn-subduction extension S-type granite A-type granite late Cryogenian northern Tarim |
| title | Late Cryogenian Circum-Rodinia Syn-Subduction Extension: Insights from Highly Fractionated S-Type and A-Type Granitoids in the Northern Tarim Craton |
| title_full | Late Cryogenian Circum-Rodinia Syn-Subduction Extension: Insights from Highly Fractionated S-Type and A-Type Granitoids in the Northern Tarim Craton |
| title_fullStr | Late Cryogenian Circum-Rodinia Syn-Subduction Extension: Insights from Highly Fractionated S-Type and A-Type Granitoids in the Northern Tarim Craton |
| title_full_unstemmed | Late Cryogenian Circum-Rodinia Syn-Subduction Extension: Insights from Highly Fractionated S-Type and A-Type Granitoids in the Northern Tarim Craton |
| title_short | Late Cryogenian Circum-Rodinia Syn-Subduction Extension: Insights from Highly Fractionated S-Type and A-Type Granitoids in the Northern Tarim Craton |
| title_sort | late cryogenian circum rodinia syn subduction extension insights from highly fractionated s type and a type granitoids in the northern tarim craton |
| topic | syn-subduction extension S-type granite A-type granite late Cryogenian northern Tarim |
| url | https://www.mdpi.com/2075-163X/13/11/1446 |
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