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\title{Time-variable strength of axial lithosphere at slow spreading ridges and
the lifespan of oceanic core complexes}



\author[1]{Hao Lu}%
\affil[1]{University of Memphis}%


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  \date{May 26, 2024}


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The lifespan of oceanic core complexes (OCCs) is finite and temporal
variations in axial magmatism is often considered to be the main
control. The mechanical weakening of an OCC's detachment fault and
footwall is another potentially important process governing the
formation of OCCs but has not received full
consideration.~\citet{Cannat_2009} suggested that the flexural rigidity
of an OCC detachment's footwall would be very low during the formation
of the OCC and significantly higher when the OCC formation terminates.
They hypothesized that when gabbro intrusion occurs at an intermediate
rate, weak hydrous minerals can form and coat the surfaces of gabbro
bodies, effectively lowering the flexural rigidity of the footwall to a
suitable value for the OCC formation. If the volume of gabbro intrusion
becomes too high or too low, gabbro bodies construct a strong framework
or hydrous minerals cannot form. Both ways, the flexural rigidity of the
footwall increases, shutting off the OCC formation. We test this
hypothesis using two-dimensional numerical models with temporal
variations in the flexural rigidity of the footwall of an OCC
detachment.~Following previous modeling studies on the OCC formation, we
construct~numerical models using an open-source version of FLAC, a
popular geodynamic modeling code. Brittle and ductile deformations are
described by a strain-softening Mohr-Coulomb plasticity and a power-law
rheology for dry diabase, respectively, and the transition between them
occurs at 600\(^{\circ}\)C. Magmatic accretion in the brittle and
ductile layers are assumed to occur at different rates that are
prescribed functions of time. Magmatic accretion rates in the ductile
layer (M\textsubscript{d}) represent gabbro intrusion rates. The
effective flexural rigidity of the footwall is connected to
M\textsubscript{d} through elastic moduli of the gabbro phase that are
functions of M\textsubscript{d} in the depths affected by hydrothermal
activities.~In this presentation, we summarize results from preliminary
2D models and discuss whether time-variable flexural rigidity can really
govern the life cycle of OCCs.

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