Pyroclastic activity at Home Plate in Gusev Crater, Mars.
نویسندگان
چکیده
Home Plate is a layered plateau in Gusev crater on Mars. It is composed of clastic rocks of moderately altered alkali basalt composition, enriched in some highly volatile elements. A coarsegrained lower unit lies under a finer-grained upper unit. Textural observations indicate that the lower strata were emplaced in an explosive event, and geochemical considerations favor an explosive volcanic origin over an impact origin. The lower unit likely represents accumulation of pyroclastic materials, whereas the upper unit may represent eolian reworking of the same pyroclastic materials.
منابع مشابه
Structure and stratigraphy of Home Plate from the Spirit Mars Exploration Rover
[1] Home Plate is a layered plateau observed by the Mars Exploration Rover Spirit in the Columbia Hills of Gusev Crater. The structure is roughly 80 m in diameter, and the raised margin exposes a stratigraphic section roughly 1.5 m in thickness. Previous work has proposed a pyroclastic surge, possibly followed by aeolian reworking of the ash, for the depositional origin for these beds. We have ...
متن کاملMars Pyroclastic Activity at Home Plate in Gusev Crater
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متن کاملHigh Pressure Phase Equilibrium Investigation of the Home Plate Pyroclastic Basalt Fastball and Application to Melting in the Martian
Introduction: Until recently, the SNC meteorites represented the only source of information about martian igneous processes [1]. This changed with the Mars Exploration Rovers which have analyzed basalts on the surface of Mars in both Gusev Crater and Meridiani Planum. These basalts are thought to be much older than the basaltic SNC meteorites [2] and have significantly different bulk chemistry ...
متن کاملAlteration mineralogy of the Home Plate and Columbia Hills – formation conditions in context to impact, volcanism, and fluvial activity
The Mars Exploration Rover Spirit investigated the igneous and alteration mineralogy and chemistry of Home Plate and its surrounding deposits. Here, we focus on using thermochemical modeling to understand the secondary alteration mineralogy at the Home Plate outcrop and surrounding Columbia Hills region in Gusev crater. At high temperatures (300 °C), magnetite occurs at very high W/R ratios, bu...
متن کاملAlteration mineralogy of Home Plate and Columbia Hills—Formation conditions in context to impact, volcanism, and fluvial activity
The Mars Exploration Rover Spirit investigated the igneous and alteration mineralogy and chemistry of Home Plate and its surrounding deposits. Here, we focus on using thermochemical modeling to understand the secondary alteration mineralogy at the Home Plate outcrop and surrounding Columbia Hills region in Gusev crater. At high temperatures (300 °C), magnetite occurs at very high W/R ratios, bu...
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ورودعنوان ژورنال:
- Science
دوره 316 5825 شماره
صفحات -
تاریخ انتشار 2007