Basin-scale fluid-flow models of the McArthur River mineral system: constraints from geochemistry, geophysics and sequence stratigraphy

Schaubs, Peter; Sheldon, Heather A.; Blaikie, Teagan; Kunzmann, Marcus; Schmid, Susanne; Spinks, Sam

doi:10.1080/22020586.2019.12073198

ASEG Extended Abstracts

2019

DOI: 10.1080/22020586.2019.12073198

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Basin-scale fluid-flow models of the McArthur River mineral system: constraints from geochemistry, geophysics and sequence stratigraphy

Peter Schaubs¹,

Heather A. Sheldon

Teagan Blaikie³

et al.

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Cited by 4 publications

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“…• Understanding mineralization (Schaubs et al, 2019) in the subsurface often involves fluid flow, heat flow and coupled 3D deformation, simulating over millennia of real time and using realistic, and therefore complicated, basin-scale geology.…”

mentioning

confidence: 99%

PorousFlow: a multiphysics simulation code for coupled problems in porous media

Green¹,

Ennis‐King²

2020

JOSS

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mentioning

confidence: 99%

PorousFlow: a multiphysics simulation code for coupled problems in porous media

Green¹,

Ennis‐King²

2020

JOSS

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An open-source multiphysics simulation code for coupled problems in porous media

Green

Ennis‐King

2021

Computers & Geosciences

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Geodynamic controls on clastic-dominated base metal deposits

Glerum,

Brune,

Magnall

et al. 2024

Solid Earth

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Abstract. To meet the growing global demand for metal resources, new ore deposit discoveries are required. However, finding new high-grade deposits, particularly those not exposed at the Earth's surface, is very challenging. Therefore, understanding the geodynamic controls on the mineralizing processes can help identify new areas for exploration. Here we focus on clastic-dominated Zn–Pb deposits, the largest global resource of zinc and lead, which formed in sedimentary basins of extensional systems. Using numerical modelling of lithospheric extension coupled with surface erosion and sedimentation, we determine the geodynamic conditions required to generate the rare spatiotemporal window where potential metal source rocks, transport pathways, and host sequences are present. We show that the largest potential metal endowment can be expected in narrow asymmetric rifts, where the mineralization window spans about 1–3 Myr in the upper ∼ 4 km of the sedimentary infill close to shore. The narrow asymmetric rift type is characterized by rift migration, a process that successively generates hyper-extended crust through sequential faulting, resulting in one wide and one narrow conjugate margin. Rift migration also leads to (1) a sufficient life span of the migration-side border fault to accommodate a thick submarine package of sediments, including coarse (permeable) continental sediments that can act as source rock; (2) rising asthenosphere beneath the thinned lithosphere and crust, resulting in elevated temperatures in these overlying sediments that are favourable for leaching metals from the source rock; (3) the deposition of organic-rich sediments that form the host rock at shallower burial depths and lower temperatures; and (4) the generation of smaller faults that cut the major basin created by the border fault and provide additional pathways for focused fluid flow from source to host rock. Wide rifts with rift migration can have similarly favourable configurations, but these occur less frequently and less potential source rock is produced, thereby limiting potential metal endowment. In simulations of narrow symmetric rifts, the conditions to form ore deposits are rarely fulfilled. Based on these insights, exploration programmes should prioritize the narrow margins formed in asymmetric rift systems, in particular regions within several tens of kilometres from the paleo-shoreline, where we predict the highest-value deposits to have formed.

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Basin-scale fluid-flow models of the McArthur River mineral system: constraints from geochemistry, geophysics and sequence stratigraphy

Cited by 4 publications

References 19 publications

PorousFlow: a multiphysics simulation code for coupled problems in porous media

PorousFlow: a multiphysics simulation code for coupled problems in porous media

An open-source multiphysics simulation code for coupled problems in porous media

Geodynamic controls on clastic-dominated base metal deposits

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