Petrogenesis of Permian high-Mg diorites in the northern margin of the North China Craton: Evidence of crust–mantle interaction
The investigation of sanukitoids is particularly important for improving our understanding of crust–mantle interaction. This paper presents zircon and titanite U–Pb and bulk −rock major element, trace element, mineral major element and Sr–Nd–Pb–Hf isotope data for newly discovered Xinhure high-Mg di...
| Main Authors: | , , |
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| Format: | Journal article |
| Language: | English |
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Elsevier
2024
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| _version_ | 1824458888608481280 |
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| author | Li, M Xu, X Palin, RM |
| author_facet | Li, M Xu, X Palin, RM |
| author_sort | Li, M |
| collection | OXFORD |
| description | The investigation of sanukitoids is particularly important for improving our understanding of crust–mantle interaction. This paper presents zircon and titanite U–Pb and bulk −rock major element, trace element, mineral major element and Sr–Nd–Pb–Hf isotope data for newly discovered Xinhure high-Mg diorite from the northern margin of the North China Craton (NCC). U–Pb dating of the southern Xinhure high-Mg diorite yielded ages of 284.8 (zircon) and 282.8 Ma (titanite), whereas the northern Xinhure high-Mg diorite crystallized at 265.8 Ma. The Early Permian and Middle Permian high-Mg diorite samples show a mantle signature, characterised by elevated Mg# values (72.5–72.9, 67.3–68.9), Cr (695–785, 314–481 ppm) and Ni (106–122, 54–58 ppm) contents. Additionally, they exhibit enrichment in large ion lithophile elements, indicative of an enriched mantle source. Isotopically, both the Early Permian and Middle Permian high-Mg diorite samples display a relatively enriched radiogenic isotopic composition, characterised by elevated initial 87Sr/86Sr ratios (0.7061–0.7063 and 0.7060–0.7066, respectively), negative εNd(t) values (−9.5 to − 8.4 and − 7.8 to − 6.1, respectively) and broad zircon εHf(t) values (−10.1 to − 4.1 and − 6.0 to + 5.3, respectively). The Nd-Hf isotopic compositions of the high-Mg diorites are decoupled as a consequence of interactions between subducting sediment-derived fluids and mantle peridotite. In light of the above, we propose a two-stage process for the formation of the Xinhure high-Mg diorite, comprising (1) partial melting of enriched mantle peridotite followed by (2) interaction between mantle-derived high-Mg diorite melts and continental crust-derived melts. Furthermore, this study provides new temporal constraints on the operation of subduction during the Late Paleozoic Paleo-Asian Ocean along the northern margin of the NCC. |
| first_indexed | 2025-02-19T04:33:03Z |
| format | Journal article |
| id | oxford-uuid:5ede8703-946f-4a71-9d0a-dcd6d85e75a0 |
| institution | University of Oxford |
| language | English |
| last_indexed | 2025-02-19T04:33:03Z |
| publishDate | 2024 |
| publisher | Elsevier |
| record_format | dspace |
| spelling | oxford-uuid:5ede8703-946f-4a71-9d0a-dcd6d85e75a02025-01-16T10:36:24ZPetrogenesis of Permian high-Mg diorites in the northern margin of the North China Craton: Evidence of crust–mantle interactionJournal articlehttp://purl.org/coar/resource_type/c_dcae04bcuuid:5ede8703-946f-4a71-9d0a-dcd6d85e75a0EnglishSymplectic ElementsElsevier2024Li, MXu, XPalin, RMThe investigation of sanukitoids is particularly important for improving our understanding of crust–mantle interaction. This paper presents zircon and titanite U–Pb and bulk −rock major element, trace element, mineral major element and Sr–Nd–Pb–Hf isotope data for newly discovered Xinhure high-Mg diorite from the northern margin of the North China Craton (NCC). U–Pb dating of the southern Xinhure high-Mg diorite yielded ages of 284.8 (zircon) and 282.8 Ma (titanite), whereas the northern Xinhure high-Mg diorite crystallized at 265.8 Ma. The Early Permian and Middle Permian high-Mg diorite samples show a mantle signature, characterised by elevated Mg# values (72.5–72.9, 67.3–68.9), Cr (695–785, 314–481 ppm) and Ni (106–122, 54–58 ppm) contents. Additionally, they exhibit enrichment in large ion lithophile elements, indicative of an enriched mantle source. Isotopically, both the Early Permian and Middle Permian high-Mg diorite samples display a relatively enriched radiogenic isotopic composition, characterised by elevated initial 87Sr/86Sr ratios (0.7061–0.7063 and 0.7060–0.7066, respectively), negative εNd(t) values (−9.5 to − 8.4 and − 7.8 to − 6.1, respectively) and broad zircon εHf(t) values (−10.1 to − 4.1 and − 6.0 to + 5.3, respectively). The Nd-Hf isotopic compositions of the high-Mg diorites are decoupled as a consequence of interactions between subducting sediment-derived fluids and mantle peridotite. In light of the above, we propose a two-stage process for the formation of the Xinhure high-Mg diorite, comprising (1) partial melting of enriched mantle peridotite followed by (2) interaction between mantle-derived high-Mg diorite melts and continental crust-derived melts. Furthermore, this study provides new temporal constraints on the operation of subduction during the Late Paleozoic Paleo-Asian Ocean along the northern margin of the NCC. |
| spellingShingle | Li, M Xu, X Palin, RM Petrogenesis of Permian high-Mg diorites in the northern margin of the North China Craton: Evidence of crust–mantle interaction |
| title | Petrogenesis of Permian high-Mg diorites in the northern margin of the North China Craton: Evidence of crust–mantle interaction |
| title_full | Petrogenesis of Permian high-Mg diorites in the northern margin of the North China Craton: Evidence of crust–mantle interaction |
| title_fullStr | Petrogenesis of Permian high-Mg diorites in the northern margin of the North China Craton: Evidence of crust–mantle interaction |
| title_full_unstemmed | Petrogenesis of Permian high-Mg diorites in the northern margin of the North China Craton: Evidence of crust–mantle interaction |
| title_short | Petrogenesis of Permian high-Mg diorites in the northern margin of the North China Craton: Evidence of crust–mantle interaction |
| title_sort | petrogenesis of permian high mg diorites in the northern margin of the north china craton evidence of crust mantle interaction |
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