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Hollow Nodules Gas Escape Sedimentary Structures in Lacustrine Deposits on Earth and Gale Crater

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Publication Date
Dec 17, 2015
Source
SETI Institute
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Unknown

Abstract

Curiosity s Mastcam and MAHLI instruments in Gale Crater (GC) imaged mm-sized circular rimmed hollow nodules (HNs)(Figure 1A), pitting the Sheepbed mudstone of Yellowknife Bay Formation [1, 2]. HNs are significantly smaller than the solid nodules within the outcrop, with an external mean diameter of 1.2 mm and an interior one of 0.7 mm [2] Several formation mechanisms of HNs have been discussed, such as:(1) Diagenetic dissolution of soluble mineral phases; or,(2) Gas bubbles released shortly after sediment ...

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