Volatiles in Martian Magmas and the Interior: Constraints and Open Questions
Abstract
With Martian magmas being the primary mechanism of transfer of volatiles from the mantle to the surface and atmosphere, it is vital to constrain the igneous Martian volatile budget not only for igneous processes but for potential habitability as well. Estimates for the water content of Martian magmas range from nearly water saturated to almost anhydrous based on the mineral and bulk chemistry of shergottites e.g., [1-6]; however, recent estimates of the water content of the parental magmas of the shergottite meteorites and their source regions have largely converged on relatively dry magmatism (< 0.1 wt% and < 100 ppm H2O, respectively) [3, 7, 8]. Nevertheless, many questions remain about other volatile species in the Martian interior including what was the volatile budget during the Noachian, what is the current and past carbon content of the Martian interior, how heterogeneous are volatile species within the Martian interior, etc. as summarized in [4]. Here, I will summarize the constraints on the volatile content of the Martian interior and basaltic magmas, and evidence for degassing of magmatic fluids into the Martian crust. Specifically, this work will summarize what are current estimates for the volatile content (beyond but including water) of shergottite parental magmas and their source region, as well as discuss open questions about the evolution of volatiles in the Martian mantle.
References: [1] Balta J.B. and McSween H.Y. (2013) Geology 41, 1115-1118. [2] Filiberto J. and Treiman A.H. (2009) Geology, 37, 1087-1090. [3] McCubbin F.M. et al. (2016) MaPS, 51, 2036-2060. [4] Filiberto J. et al. (2016a) MaPS, 51, 1935-1958. [5] McCubbin F.M. et al. (2012) Geology, 40, 683-686. [6] Dann J.C. et al. (2001) MaPS, 36, 793-806. [7] Filiberto J. et al. (2019) Chapter 2 - in Volatiles in the Martian Crust, J. Filiberto and S.P. Schwenzer, Eds., Elsevier. p. 13-33. [8] Filiberto et al. (2016) MaPS, 51, 2023-2035.- Publication:
-
AGU Fall Meeting Abstracts
- Pub Date:
- December 2019
- Bibcode:
- 2019AGUFM.V53C..01F
- Keywords:
-
- 1038 Mantle processes;
- GEOCHEMISTRY;
- 1060 Planetary geochemistry;
- GEOCHEMISTRY;
- 8430 Volcanic gases;
- VOLCANOLOGY;
- 8450 Planetary volcanism;
- VOLCANOLOGY