Hong-Da Zheng

China University of Geosciences

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Qing Xiong

China University of Geosciences

William L. Griffin

Macquarie University

Hong‐Kun Dai

China University of Geosciences

Shaojie Li

Sinopec (China)

Jianping Zheng

China University of Geosciences

Suzanne Y. O′Reilly

ARC Centre of Excellence for Core to Crust Fluid Systems

Zhi-Yong Li

China University of Geosciences

Wei‐Qi Zhang

Northeast Forestry University

Xiang Zhou

China University of Geosciences

Jianping Zheng

China Mobile (China)

Cooperative Institutions

China University of Geosciences

Macquarie University

ARC Centre of Excellence for Core to Crust Fluid Systems

Australian Research Council

State Key Laboratory of Geological Processes and Mineral Resources

Chinese Academy of Sciences

China University of Geosciences (Beijing)

Mineral Resources

Woods Hole Oceanographic Institution

Nanjing University

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Vertical depletion of ophiolitic mantle decodes melt focusing and interaction in the asthenospheric column under oceanic spreading centers

Research Square (Research Square) (2022)

Qing Xiong Hong‐Kun Dai Jianping Zheng William L. Griffin Hong-Da Zheng

Abstract Adiabatic decompressional melting of asthenosphere under spreading centers has been accepted to produce vertical compositional variations of oceanic lithospheric mantle. However, theoretical estimates of the compositional gradients are much smaller than those observed from ophiolites, clearly requiring additional processes. Here we conduct systematic high-density sampling and whole-rock and mineral compositional analyses of harzburgites in a Tibetan ophiolitic mantle section (~2 km thick), which shows a primary upward depletion (~12% difference over ~2 km) and local depleted anomalies. Thermodynamic modeling demonstrates that these features cannot be produced by decompressional melting or proportional compression of residual mantle. Instead, they can be explained by reaction between silica-undersaturated melts and peridotite with lateral melt/rock variations in the topmost asthenospheric upwelling column, showing stronger depletion in its melt-focusing center and local zones. This column will split from the center into two parts, which rotate in the mantle flow to become horizontal, thus forming the oceanic uppermost lithospheric mantle characterized by vertical depletion and local anomalies within a sub-spreading-center regime.

Peridotite

Chromitite

Asthenosphere

Tectonophysics

Hotspot (geology)

10.21203/rs.3.rs-1394420/v1

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Complex Formation Processes of the Yarlung Zangbo Ophiolites (Tibet)

Goldschmidt Abstracts (2020)

Qing Xiong Jianping Zheng Hong-Da Zheng William L. Griffin Suzanne Y. O′Reilly

10.46427/gold2020.2931

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Vertical depletion of ophiolitic mantle reflects melt focusing and interaction in sub-spreading-center asthenosphere

Nature Communications (2022)

Qing Xiong Hong‐Kun Dai Jianping Zheng William L. Griffin Hong-Da Zheng

Decompressional melting of asthenosphere under spreading centers has been accepted to produce oceanic lithospheric mantle with vertical compositional variations, but these gradients are much smaller than those observed from ophiolites, which clearly require additional causes. Here we conduct high-density sampling and whole-rock and mineral analyses of peridotites across a Tibetan ophiolitic mantle section (~2 km thick), which shows a primary upward depletion (~12% difference) and local more-depleted anomalies. Thermodynamic modeling demonstrates that these features cannot be produced by decompressional melting or proportional compression of residual mantle, but can be explained by melt-peridotite reaction with lateral melt/rock ratio variations in an upwelling asthenospheric column, producing stronger depletion in the melt-focusing center and local zones. This column splits symmetrically and flows to become the horizontal uppermost lithospheric mantle, characterized by upward depletion and local anomalies. This model provides insights into melt extraction and uppermost-mantle origin beneath spreading centers with high melt fluxes.

Asthenosphere

Peridotite

10.1038/s41467-022-34781-w

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Citations (15)

Ultra-depleted melt product preserved in the Ladong ophiolitic peridotites of the North Qilian Orogenic Belt, Northern Tibet

Lithos (2022)

Xiang Zhou Jianping Zheng Zeng‐Bao Huang Zhi-Yong Li Wei‐Qi Zhang

Pyroxene

Peridotite

10.1016/j.lithos.2022.106985

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Citations (1)