Evidence item

The quoted passage directly reports that high-elevation Margin-unit exposures above approximately −2350 m have texture and chemistry indicative of slowly cooled crystalline olivine-rich rock without significant water exposure. DIRECT_TEXT

Authenticity UNVERIFIED · extraction UNVERIFIED · independence group none (unreviewed) · created seq 24640

Source: Lake- and groundwater-associated alteration of the olivine-rich Margin unit in Jezero crater, Mars · locator {} · excerpt hash sha256:131c071cbbb4b287710ef75b40b55a97f5faeb0b86f7edb06bf10558adb6717d

Using SuperCam data, we evaluate the origin and alteration history of this enigmatic unit. Here, we show that the Margin unit explored at high elevations (>−2350 m) has a texture and chemistry indicative of a slow-cooled, crystalline, olivine-rich rock without significant water exposure. In contrast, exposures situated below the hypothesized Jezero paleolake’s second terrace level reveal a complex history of water-rock interaction.