Magmatic history of Martian highland volcanoes and Tharsis: clues from electron reflection magnetometry

Details Magmatic history of Martian highland volcanoes and Tharsis: clues from electron reflection magnetometry Magmatic history of Martian highland volcanoes and Tharsis: clues from electron reflection magnetometry

Dec 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007agufm.p12a..01l&link_type=abstract

American Geophysical Union, Fall Meeting 2007, abstract #P12A-01

Mathematics

Logic

1595 Planetary Magnetism: All Frequencies And Wavelengths, 5440 Magnetic Fields And Magnetism, 5480 Volcanism (6063, 8148, 8450), 6225 Mars, 8485 Remote Sensing Of Volcanoes

Scientific paper

Martian crust which has been demagnetized by magmatic intrusion in the last ~4 Ga cannot have subsequently acquired, upon cooling, any substantial thermoremanent magnetization, due to the lack of a global magnetic field since then. While some volcanoes may have been active earlier, most if not all have experienced significant magmatism in the absence of such a field, as likely has much of the Tharsis province. Therefore, unlike the terrestrial case, the magnetic signature of martian volcanoes should be dominated by thermal demagnetization. We examine, using the electron reflection (ER) map of crustal magnetic field magnitude at 185 km altitude, the degree and spatial extent of thermal demagnetization (assumed to be due to magmatic intrusion) at the highland volcanoes Tyrrhena Patera and Syrtis Major and in the southwestern region of Tharsis. Using topographic and photogeological estimates of extruded magmas and straightforward thermal modeling, we conclude it is likely that Syrtis has a substantially higher ratio of intruded to extruded magmas than Tyrrhena. This may be attributed to active extension due to Syrtis's proximity to the Isidis basin or possibly by more buoyant and/or differentiated magmas. We also observe that the sharp boundary between the moderately magnetized and completely demagnetized regions of southwestern Tharsis matches very well with the currently identifiable extent of fields of small volcanic vents between the major volcanoes. We investigate, again with simple thermal modeling, the possibility that these fields of small vents might represent significant volcanic events within the region, and when considered with major shield building events, may have contributed to the demagnetization of the entire province.

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