Intrusion of granitic magma into the continental crust facilitated by magma pulsing and dike‐diapir interactions: Numerical simulations

Thermal demagnetization of Martian upper crust by magma intrusion

[1] The absent or weak magnetic field above large Martian volcanoes may provide constraints on their formation and the carrier of magnetization. We consider the ability of magma intrusions to thermally demagnetize the shallow crust beneath volcanoes through heat conduction and hydrothermal circulation. If magnetization is dominated by magnetite, the volume of crust that is thermally demagnetize...

Magma hybridization in the middle crust: Possible consequences for deep-crustal magma mixing

The 465 Ma Svarthopen pluton in northcentral Norway was emplaced under middle-crustal conditions (~700 MPa) into metasedimentary rocks of the Helgeland Nappe Complex. The pluton is characterized by zones of mingling and mixing of gabbro/ diorite with peraluminous, garnet-bearing biotite granite. Variation in bulk-rock Sr and Nd isotope ratios are consistent with simple mixing; however, nonunifo...

Capturing magma intrusion and faulting processes during continental rupture: seismicity of the Dabbahu (Afar) rift

C. J. Ebinger,1,2 D. Keir,2,3 A. Ayele,4 E. Calais,5 T. J. Wright,3 M. Belachew,1,4 J. O. S. Hammond,6 E. Campbell1 and W. R. Buck7 1Department of Earth and Environmental Sciences, University of Rochester, Rochester, NY 14627, USA. E-mail: [email protected] 2Department of Geology, Royal Holloway University of London, Egham, TW20 0EX, UK 3School of Earth and Environmental Sciences, Uni...

Two-dimensional magma-repository interactions

Numerical modelling of magma dynamics coupled to tectonic deformation of lithosphere and crust

S U M M A R Y Many unresolved questions in geodynamics revolve around the physical behaviour of the two-phase system of a silicate melt percolating through and interacting with a tectonically deforming host rock. Well-accepted equations exist to describe the physics of such systems and several previous studies have successfully implemented various forms of these equations in numerical models. T...