MacArgon free download for Mac


19 October 2021

Simulation of argon retention in minerals and rocks.


MacArgon allows for the simulation of argon retention in minerals and rocks. Arbitrary pressure-temperature-time paths can be input that a rock must follow, and calculations are performed as to the diffusion of argon from the mineral grains in question. The program allows fact distributions of diffusion domain size and volume that allow replication of data obtained from temperature-controlled furnace-step-heating experiments in an ultra-high-vacuum mass spectrometer designed to measure the concentration of the isotopes of argon. By considering bulk fusion the program also replicates the answers likely to be obtained using laser-spot analysis, or laser-step-heating by pulse-heating the crystals. The program also allows parametric inversion, by considering the variation obtained in families of pressure-temperature-time paths. Manual inversion takes advantage of the highly interactive nature of the graphical user interface.

What's new in MacArgon

Version 5.2.4:
  • Version §5 of MacArgon allows modeling and simulation for argon geochronology. Argon accumulates through radiogenic decay but is lost by diffusion or the result of microstructural events at individual control points along the pressure-temperature-time path. Monte Carlo simulations attempt to match the simulated spectrum with selected steps in the reference age spectrum.
  • Version §5.2 adds sensitivity analysis for individual simulations. A "MacArgon document" is used to store XML. Different types of parametric inversion are facilitated by the inclusion of options for flash heating or analytical solutions for cooling near igneous bodies. The temperature history above and below a compressional thrust or an extensional detachment can also be simulated prior to being applied to a mineral to generate an apparent age spectrum.
  • Version §5.2.4 fixes an issue with T-t estimates during detachment faulting.
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App requirements: 
  • Intel 64
  • macOS 11.3.0 or later
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