{
  "abstract": "Constraining the behavior of Cu during subduction is the key to decipher processes leading to the porphyry Cu deposit formation at convergent margins, while also shedding light on S cycling owing to the chalcophile affinity of Cu. This study reported δ⁶⁵Cu values for bulk-rock and chalcopyrite from a metamafic rock from the (ultra-)high pressure metamorphic belt of Southwestern Tianshan, China. The rock consists of abundant glaucophane-dominated breccias (part A) crosscut by a large-scale omphacite-rich vein system (part B) with sharp boundaries. The glaucophanedominated breccias are interpreted as partially dehydrated metabasalts, while the omphacite-rich vein system reflects the main fluid pathways in the subduction channel. Part A exhibits elevated δ⁶⁵Cu values (0.07‰ to 0.36‰) and low Cu contents (52 ppm on average) compared to MORB (δ⁶⁵Cu=0.04‰ to 0.14‰; Cu=90 ppm). Together with heavier δ⁶⁵Cu values of chalcopyrite (-0.17‰ to 0.23‰) in part A compared to magmatic sulfide, these suggest that dehydration preferentially releases isotopically light Cu and leaves residues with heavier Cu isotope compositions. Part B shows complementary light δ⁶⁵Cu values both in bulk rock and chalcopyrite. The negative correlation between S and δ⁶⁵Cu indicates that precipitated sulfides complexed with light Cu isotopes may result in lowered δ⁶⁵Cu values in the rock during fluid-rock interactions. Overall, the data point to the mobilization of isotopically light Cu-bearing fluids during the dehydration of mafic crust in subduction environments. However, the absence of commonly high Cu contents in arc magmas suggests that the released copper may be buffered by sulfides in the sub-arc mantle, resulting in Cu-rich sulfide",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": null,
  "author_total": 8,
  "authors": [
    {
      "name": "Yu Chen"
    },
    {
      "name": "Yuanyuan Xiao"
    },
    {
      "name": "Yongxiang Yao"
    },
    {
      "name": "Baptiste Debret"
    },
    {
      "name": "Ziwei Sun"
    },
    {
      "name": "Hongmei Gong"
    },
    {
      "name": "Yao Liu"
    },
    {
      "name": "Kaiyun Chen"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/fs5z0b12yk6r9.bib",
  "cited_by": 0,
  "doi": "10.1016/j.chemgeo.2026.123661",
  "fulltext_url": null,
  "id": "fs5z0b12yk6r9",
  "issns": [
    "0009-2541"
  ],
  "landing_url": "https://hal.science/hal-05785320v1",
  "language": "en",
  "licence": "CC-BY-NC-ND-4.0",
  "licence_label": "CC BY-NC-ND 4.0",
  "licence_source": "article",
  "licence_url": "https://creativecommons.org/licenses/by-nc-nd/4.0/",
  "metadata_licence": null,
  "native_subjects": [
    [
      "hal",
      "0.sdu"
    ],
    [
      "hal",
      "1.sdu.stu"
    ],
    [
      "hal",
      "2.sdu.stu.gc"
    ],
    [
      "openalex",
      "1908|Geological and Geochemical Analysis"
    ]
  ],
  "openalex": "W7203755609",
  "pdf_url": "https://hal.science/hal-05785320/document",
  "pmcid": null,
  "pmid": null,
  "published": "2026-10-08",
  "publisher": "Elsevier",
  "ris": "https://research.draconitic.com/paper/fs5z0b12yk6r9.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:17:50Z",
      "native_id": "hal-05785320",
      "source": "hal",
      "url": "https://hal.science/hal-05785320v1"
    }
  ],
  "subjects": [
    {
      "field": "earth",
      "origin": "hal:2.sdu.stu.gc",
      "subfield": "geology-geochemistry"
    }
  ],
  "title": "Copper isotope evidence for Cu transfer during oceanic crust subduction: insights from the (ultra)high-pressure metamorphic belt of Southwestern Tianshan, China",
  "title_text": "Copper isotope evidence for Cu transfer during oceanic crust subduction: insights from the (ultra)high-pressure metamorphic belt of Southwestern Tianshan, China",
  "type": "peer-reviewed",
  "updated_at": "2026-10-30T12:17:50Z",
  "url": "https://research.draconitic.com/paper/fs5z0b12yk6r9",
  "venue": "Chemical Geology",
  "versions": []
}