Magmatic evolution and mush processes of the Xiarihamu Ni-Cu deposit: insights from olivine-orthopyroxene-clinopyroxene chemistry.
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| Title: | Magmatic evolution and mush processes of the Xiarihamu Ni-Cu deposit: insights from olivine-orthopyroxene-clinopyroxene chemistry. |
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| Authors: | Zheng, Xu-Yang1,2,3 (AUTHOR), Mao, Ya-Jing1,2 (AUTHOR) maoyajing@mail.iggcas.ac.cn, Yuan, Fang-Lin1,2,3 (AUTHOR), Li, Yi1,2,3 (AUTHOR), Li, Wen-Jun1 (AUTHOR), Qin, Ke-Zhang1,2 (AUTHOR) |
| Source: | Mineralium Deposita. Apr2026, Vol. 61 Issue 4, p895-917. 23p. |
| Subject Terms: | *Orthopyroxene, *Olivine, *Copper-nickel alloys, *Analytical geochemistry, *Pyroxene, *Sulfide minerals, *Magmas |
| Abstract: | Mush processes are important in the formation of magmatic sulfide deposits, yet they remain poorly understood. The world-class Xiarihamu Ni-Cu deposit consists of two distinct lithological units: a Phase I olivine-free pyroxenitic unit and a Phase II olivine-enriched unit. Sector and normal zoning patterns of Cr in orthopyroxene from two phases indicate multiple-stage growth, involving rapid core crystallization during cumulus stages and overgrowth from interstitial melt during postcumulus stages. High-precision microprobe profile analyses reveal complex Mg-Ca-Al-Ni-Na zonings in orthopyroxene strongly coupled with Cr, exhibiting growth features with minimal diffusional overprint. In contrast, olivine exhibits Fo values (85–89 mol%) and trace element concentrations (Ni, Mn, Zn, Co) that correlate with the abundance of cumulus phases, reflecting extensive postcumulus resetting via diffusive re-equilibration with interstitial melts. The contrasting response of olivine and orthopyroxene to mush processes is attributed to their contrasting element diffusivities, with lower diffusivities in pyroxene allowing it to retain primary magmatic features. The limited variation in Mg# across Cr–Al sector-zoned orthopyroxene suggests that Mg# is largely unaffected by intracrystalline partitioning and thus records magmatic differentiation. Distinct correlations between Mg# and Ni, Co, Zn, and LREEs in orthopyroxene reflect divergent evolutionary trends in the parent magmas of the two units. However, interstitial clinopyroxene from both units displays similar variations in major and trace elements, indicating interstitial melt chemical homogenization within mushes. The zoning and geochemical patterns in Xiarihamu minerals indicate the presence of a relatively thick mush zone during solidification, facilitating dynamic sulfide migration and accumulation during mush evolution. [ABSTRACT FROM AUTHOR] |
| Database: | Energy & Power Source |
| FullText | Text: Availability: 0 |
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| Header | DbId: enr DbLabel: Energy & Power Source An: 192417785 AccessLevel: 6 PubType: Academic Journal PubTypeId: academicJournal PreciseRelevancyScore: 0 |
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| Items | – Name: Title Label: Title Group: Ti Data: Magmatic evolution and mush processes of the Xiarihamu Ni-Cu deposit: insights from olivine-orthopyroxene-clinopyroxene chemistry. – Name: Author Label: Authors Group: Au Data: <searchLink fieldCode="AR" term="%22Zheng%2C+Xu-Yang%22">Zheng, Xu-Yang</searchLink><relatesTo>1,2,3</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Mao%2C+Ya-Jing%22">Mao, Ya-Jing</searchLink><relatesTo>1,2</relatesTo> (AUTHOR)<i> maoyajing@mail.iggcas.ac.cn</i><br /><searchLink fieldCode="AR" term="%22Yuan%2C+Fang-Lin%22">Yuan, Fang-Lin</searchLink><relatesTo>1,2,3</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Li%2C+Yi%22">Li, Yi</searchLink><relatesTo>1,2,3</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Li%2C+Wen-Jun%22">Li, Wen-Jun</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Qin%2C+Ke-Zhang%22">Qin, Ke-Zhang</searchLink><relatesTo>1,2</relatesTo> (AUTHOR) – Name: TitleSource Label: Source Group: Src Data: <searchLink fieldCode="JN" term="%22Mineralium+Deposita%22">Mineralium Deposita</searchLink>. Apr2026, Vol. 61 Issue 4, p895-917. 23p. – Name: Subject Label: Subject Terms Group: Su Data: *<searchLink fieldCode="DE" term="%22Orthopyroxene%22">Orthopyroxene</searchLink><br />*<searchLink fieldCode="DE" term="%22Olivine%22">Olivine</searchLink><br />*<searchLink fieldCode="DE" term="%22Copper-nickel+alloys%22">Copper-nickel alloys</searchLink><br />*<searchLink fieldCode="DE" term="%22Analytical+geochemistry%22">Analytical geochemistry</searchLink><br />*<searchLink fieldCode="DE" term="%22Pyroxene%22">Pyroxene</searchLink><br />*<searchLink fieldCode="DE" term="%22Sulfide+minerals%22">Sulfide minerals</searchLink><br />*<searchLink fieldCode="DE" term="%22Magmas%22">Magmas</searchLink> – Name: Abstract Label: Abstract Group: Ab Data: Mush processes are important in the formation of magmatic sulfide deposits, yet they remain poorly understood. The world-class Xiarihamu Ni-Cu deposit consists of two distinct lithological units: a Phase I olivine-free pyroxenitic unit and a Phase II olivine-enriched unit. Sector and normal zoning patterns of Cr in orthopyroxene from two phases indicate multiple-stage growth, involving rapid core crystallization during cumulus stages and overgrowth from interstitial melt during postcumulus stages. High-precision microprobe profile analyses reveal complex Mg-Ca-Al-Ni-Na zonings in orthopyroxene strongly coupled with Cr, exhibiting growth features with minimal diffusional overprint. In contrast, olivine exhibits Fo values (85–89 mol%) and trace element concentrations (Ni, Mn, Zn, Co) that correlate with the abundance of cumulus phases, reflecting extensive postcumulus resetting via diffusive re-equilibration with interstitial melts. The contrasting response of olivine and orthopyroxene to mush processes is attributed to their contrasting element diffusivities, with lower diffusivities in pyroxene allowing it to retain primary magmatic features. The limited variation in Mg# across Cr–Al sector-zoned orthopyroxene suggests that Mg# is largely unaffected by intracrystalline partitioning and thus records magmatic differentiation. Distinct correlations between Mg# and Ni, Co, Zn, and LREEs in orthopyroxene reflect divergent evolutionary trends in the parent magmas of the two units. However, interstitial clinopyroxene from both units displays similar variations in major and trace elements, indicating interstitial melt chemical homogenization within mushes. The zoning and geochemical patterns in Xiarihamu minerals indicate the presence of a relatively thick mush zone during solidification, facilitating dynamic sulfide migration and accumulation during mush evolution. [ABSTRACT FROM AUTHOR] |
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| RecordInfo | BibRecord: BibEntity: Identifiers: – Type: doi Value: 10.1007/s00126-025-01421-4 Languages: – Code: eng Text: English PhysicalDescription: Pagination: PageCount: 23 StartPage: 895 Subjects: – SubjectFull: Orthopyroxene Type: general – SubjectFull: Olivine Type: general – SubjectFull: Copper-nickel alloys Type: general – SubjectFull: Analytical geochemistry Type: general – SubjectFull: Pyroxene Type: general – SubjectFull: Sulfide minerals Type: general – SubjectFull: Magmas Type: general Titles: – TitleFull: Magmatic evolution and mush processes of the Xiarihamu Ni-Cu deposit: insights from olivine-orthopyroxene-clinopyroxene chemistry. Type: main BibRelationships: HasContributorRelationships: – PersonEntity: Name: NameFull: Zheng, Xu-Yang – PersonEntity: Name: NameFull: Mao, Ya-Jing – PersonEntity: Name: NameFull: Yuan, Fang-Lin – PersonEntity: Name: NameFull: Li, Yi – PersonEntity: Name: NameFull: Li, Wen-Jun – PersonEntity: Name: NameFull: Qin, Ke-Zhang IsPartOfRelationships: – BibEntity: Dates: – D: 01 M: 04 Text: Apr2026 Type: published Y: 2026 Identifiers: – Type: issn-print Value: 00264598 Numbering: – Type: volume Value: 61 – Type: issue Value: 4 Titles: – TitleFull: Mineralium Deposita Type: main |
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