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14 results for “Fore-arc”
Fore-arc metasomatism by hybrid slab fluids during subduction initiation: Sr–Mg–Ca isotopes of rodingite, western Yarlung Zangbo suture zone
<p> Subduction zone metasomatism is critical for Earth’s material exchanges, yet understanding slab dehydration, particularly deserpentinization beneath fore-arcs, remains challenging. Here, we present Sr–Mg–Ca isotopic data for the Purang rodingites in the western Yarlung-Zangbo suture zone (YZSZ). These rodingites, dominated by amphibolite- to greenschist-facies minerals like tremolite, magnesiohornblende, and chlorite, exhibit cumulate textures and rare earth element patterns resembling troctolites or gabbronorites, presumably formed beneath a seafloor spreading center. The rodingites are enriched in large ion lithophile elements and depleted in high field strength elements. They show higher initial <sup>87</sup>Sr/<sup>86</sup>Sr ratios (0.7067–0.7075) and elevated δ<sup>26</sup>Mg values (–0.22 ± 0.07‰ to –0.13 ± 0.02‰) compared to pristine oceanic basalts, while their δ<sup>44/40</sup>Ca values (0.72 ± 0.02‰ to 0.87 ± 0.03‰) correspond to mid-ocean ridge basalts (MORB). These features imply fore-arc mantle metasomatism of an original MOR-derived protolith at <40 km slab depth, driven by Sr- and Mg-rich fluids from clay-rich sediments and serpentinitized mantle, respectively. The measured Sr and Mg isotope compositions can be reproduced by mixing a MORB-like protolith with hybrid fluids derived from 70–30% clays and 30–70% serpentinites, with a fluid-to-rock ratio of approximately 1:3–1:5. Combined with studies on YZSZ metamorphic soles, we propose this metasomatism occurred during incipient subduction of the Neo-Tethys oceanic rocks. Our studies highlight the significance of deserpentinization at shallow fore-arc mantle settings during subduction initiation and suggest that subducting slabs exhibit more varied dehydration characteristics than previously recognized.</p>
Supplementary material 1 from: Xiao Y, Zhang H (2024) Three new species and one new record of Deimatidae (Echinodermata, Holothuroidea, Synallactida) discovered in the South China Sea and the Mariana fore-arc area using integrative taxonomic methods. ZooKeys 1195: 309-335. https://doi.org/10.3897/zookeys.1195.115913
Estimates of p-distances of the COI gene among deimatid species and studied sequences
Figure 8 from: Xiao Y, Zhang H (2024) Three new species and one new record of Deimatidae (Echinodermata, Holothuroidea, Synallactida) discovered in the South China Sea and the Mariana fore-arc area using integrative taxonomic methods. ZooKeys 1195: 309-335. https://doi.org/10.3897/zookeys.1195.115913
Figure 8 Oneirophanta mutabilis mutabilis Théel, 1879 (IDSSE-2020-1203-HS01) A dorsal view B ventral view. Scale bar: 3 cm.
Figure 7 from: Xiao Y, Zhang H (2024) Three new species and one new record of Deimatidae (Echinodermata, Holothuroidea, Synallactida) discovered in the South China Sea and the Mariana fore-arc area using integrative taxonomic methods. ZooKeys 1195: 309-335. https://doi.org/10.3897/zookeys.1195.115913
Figure 7 SEM images of Oneirophanta lucerna sp. nov. (Holotype IDSSE-2023-0208-HS02) A1–A4 dorsal body wall B1–B4 papillae C1–C4 ventral body wall D1–D5 tube feet E1–E5 tentacles Scale bars: 50 μm (A1–A2, B1–B2, C2); 100 μm (C3, D1–E5); 200 μm (A3, A4; B3–C1).
Figure 5 from: Xiao Y, Zhang H (2024) Three new species and one new record of Deimatidae (Echinodermata, Holothuroidea, Synallactida) discovered in the South China Sea and the Mariana fore-arc area using integrative taxonomic methods. ZooKeys 1195: 309-335. https://doi.org/10.3897/zookeys.1195.115913
Figure 5 SEM images of Oneirophanta brunneannulata sp. nov. (Holotype: IDSSE-2018-0612-HS01) A1–A3 dorsal body wall B1–B6 papillae C tentacles D1–D4 tube feet E1–E2 ventral body wall. Scale bars: 300 μm.
Figure 4 from: Xiao Y, Zhang H (2024) Three new species and one new record of Deimatidae (Echinodermata, Holothuroidea, Synallactida) discovered in the South China Sea and the Mariana fore-arc area using integrative taxonomic methods. ZooKeys 1195: 309-335. https://doi.org/10.3897/zookeys.1195.115913
Figure 4 Oneirophanta brunneannulata sp. nov. (Holotype: IDSSE-2018-0612-HS01) A dorsal view B ventral view. Scale bar: 6 cm.
Figure 3 from: Xiao Y, Zhang H (2024) Three new species and one new record of Deimatidae (Echinodermata, Holothuroidea, Synallactida) discovered in the South China Sea and the Mariana fore-arc area using integrative taxonomic methods. ZooKeys 1195: 309-335. https://doi.org/10.3897/zookeys.1195.115913
Figure 3 SEM images of different tissues from Oneirophanta idsseica sp. nov. (Holotype: IDSSE-2018-0612-HS01) A1–A10 dorsal body wall B1–B10 papillae C tentacles D1–D4 tube feet E1–E5 ventral body wall. Scale bars: 50 μm (A1, A2, A7, B3, B4, D3, D4, E4); 100 μm (A3–A6, A8, A10, B2, B5, B6, E3, E5); 300 μm (A9, B1, B7–B10, C, D1, D2, E1, E2).
Figure 2 from: Xiao Y, Zhang H (2024) Three new species and one new record of Deimatidae (Echinodermata, Holothuroidea, Synallactida) discovered in the South China Sea and the Mariana fore-arc area using integrative taxonomic methods. ZooKeys 1195: 309-335. https://doi.org/10.3897/zookeys.1195.115913
Figure 2 Oneirophanta idsseica sp. nov. (Holotype: IDSSE-2018-0612-HS01) A in situ image B holotype in live C dorsal view D ventrolateral view. Scale bars: 5 cm.
Figure 12 from: Xiao Y, Zhang H (2024) Three new species and one new record of Deimatidae (Echinodermata, Holothuroidea, Synallactida) discovered in the South China Sea and the Mariana fore-arc area using integrative taxonomic methods. ZooKeys 1195: 309-335. https://doi.org/10.3897/zookeys.1195.115913
Figure 12 Maximum likelihood (ML) and Bayesian inference (BI) trees based on concatenated 16S-COI sequences showing phylogenetic relationships among deimatid species. The new sequences provided in this study are in bold AML tree, with bootstrap replications labeled BBI tree, with posterior probability labeled.
Figure 1 from: Xiao Y, Zhang H (2024) Three new species and one new record of Deimatidae (Echinodermata, Holothuroidea, Synallactida) discovered in the South China Sea and the Mariana fore-arc area using integrative taxonomic methods. ZooKeys 1195: 309-335. https://doi.org/10.3897/zookeys.1195.115913
Figure 1 Sampling sites for examined species of Deimatidae in the South China Sea and the Mariana fore-arc area.
Figure 11 from: Xiao Y, Zhang H (2024) Three new species and one new record of Deimatidae (Echinodermata, Holothuroidea, Synallactida) discovered in the South China Sea and the Mariana fore-arc area using integrative taxonomic methods. ZooKeys 1195: 309-335. https://doi.org/10.3897/zookeys.1195.115913
Figure 11 SEM images of Deima validum validum (IDSSE-2019-0630-HS01). A1–A3 dorsal body wall B1–B3 papillae C1–C4 tube feet D1–D2 ventral body wall. Scale bars: 300 μm (A1–B3); 50 μm (D1, D2)
Figure 6 from: Xiao Y, Zhang H (2024) Three new species and one new record of Deimatidae (Echinodermata, Holothuroidea, Synallactida) discovered in the South China Sea and the Mariana fore-arc area using integrative taxonomic methods. ZooKeys 1195: 309-335. https://doi.org/10.3897/zookeys.1195.115913
Figure 6 Oneirophanta lucerna sp. nov. (Holotype IDSSE-2023-0208-HS02) A, B in situ images C dorsal view D ventral view. Scale bars: 5 cm.
Figure 9 from: Xiao Y, Zhang H (2024) Three new species and one new record of Deimatidae (Echinodermata, Holothuroidea, Synallactida) discovered in the South China Sea and the Mariana fore-arc area using integrative taxonomic methods. ZooKeys 1195: 309-335. https://doi.org/10.3897/zookeys.1195.115913
Figure 9 SEM images of Oneirophanta mutabilis mutabilis Théel, 1879 (IDSSE-20201203-HS01). A1, A2 dorsal body wall B1, B2 dorsal papillae C1–C3 ventral body wall D1–D5 tube feet E1–E5 tentacle. Scale bars: 300 μm (A1–C3); 100 μm (D1–E1, E3–E5); 50 μm (E2).
Figure 10 from: Xiao Y, Zhang H (2024) Three new species and one new record of Deimatidae (Echinodermata, Holothuroidea, Synallactida) discovered in the South China Sea and the Mariana fore-arc area using integrative taxonomic methods. ZooKeys 1195: 309-335. https://doi.org/10.3897/zookeys.1195.115913
Figure 10 Deima validum validum (IDSSE-2018-0531-HS02 and IDSSE-2019-0630-HS01) A in situ image (IDSSE-2018-0531-HS02) B in vivo image (IDSSE-2018-0531-HS02) C dorsal view (IDSSE-2019-0630-HS01) D ventral view (IDSSE-2019-0630-HS01). Scale bars: 5 cm.
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