Migration of dissolution front in a fracture network − Implications for weathering of fractured bedrock systems and boulder formation

Favier, Sylvain; Teitler, Yoram; Golfier, Fabrice; Cathelineau, Michel

doi:10.1016/j.jhydrol.2024.132056

Journal of Hydrology

2024

DOI: 10.1016/j.jhydrol.2024.132056

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Migration of dissolution front in a fracture network − Implications for weathering of fractured bedrock systems and boulder formation

Sylvain Favier,

Yoram Teitler,

Fabrice Golfier

et al.

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2024

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Cited by 1 publication

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Peridotite Weathering and Ni Redistribution in New Caledonian Laterite Profiles: Influence of Climate, Hydrology, and Structure

Cathelineau,

Teitler,

Grimaud

et al. 2024

Minerals

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The peridotite massifs of New Caledonia are characterised by complex hydrodynamics influenced by intense inherited fracturing, uplift, and erosion. Following the formation of the erosion surfaces and alteration processes, these processes drive chemical redistribution during weathering; particularly lateritisation and saprolitisation. Magnesium, silica, and trace elements such as nickel and cobalt—released as the dissolution front advances—are redistributed through the system. New observations and interpretations reveal how lateritic paleo-land surfaces evolved, and their temporal relationship with alteration processes since the Oligocene. Considering the geometry of discontinuity networks ranging from micro-fractures to faults, the transfers occur in dual-permeability environments. Olivine dissolution rates are heterogeneously due to differential solution renewal caused by erosion and valley deepening. Differential mass transfer occurs between mobile regions of highly transmissive faults, while immobile areas correspond to the rock matrix and the secondary fracture network. The progression of alteration fronts controls the formation of boulders and the distribution of nickel across multiple scales. In the saprolite, nickel reprecipitates mostly in talc-like phases, as well as minor nontronite and goethite with partial diffusion in inherited serpentine. The current nickel distribution results from a complex interplay of climatic, hydrological and structural factors integrated into a model across different scales and times.

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Peridotite Weathering and Ni Redistribution in New Caledonian Laterite Profiles: Influence of Climate, Hydrology, and Structure

Cathelineau,

Teitler,

Grimaud

et al. 2024

Minerals

View full text Add to dashboard Cite

show abstract

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Migration of dissolution front in a fracture network − Implications for weathering of fractured bedrock systems and boulder formation

Cited by 1 publication

References 95 publications

Peridotite Weathering and Ni Redistribution in New Caledonian Laterite Profiles: Influence of Climate, Hydrology, and Structure

Peridotite Weathering and Ni Redistribution in New Caledonian Laterite Profiles: Influence of Climate, Hydrology, and Structure

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