Layered Mantle Deposits in Northeast Arabia Terra, Mars: Ii. Models for Noachian-hesperian Sedimentation, Erosion and Terrain Inversion
نویسنده
چکیده
Introduction: The thick mantle material in the etched unit (Nple) and dissected unit (Npld) of in northeast
منابع مشابه
Layered mantling deposits in northeast Arabia Terra, Mars: Noachian-Hesperian sedimentation, erosion, and terrain inversion
[1] Thick, layered mantling deposits of different ages occur in several nonpolar regions of Mars and are thought to represent volcanic ash and/or climate-related ice-dust deposition. One such deposit is a layered mantling unit that unconformably blanketed highlands terrain in northeast Arabia Terra during the Late Noachian and/or earliest Hesperian. Shortly thereafter, by the mid-Hesperian, thi...
متن کاملLayered Mantle Deposits in Northeast Arabia Terra, Mars: I. Observations of Noachian-hesperian Sedimentation, Erosion and Terrain Inversion
Introduction and Background: Northeast Arabia Terra, west and north of Syrtis Major, has long been known to be characterized by significant terrain mantling and exhumation [1-3]. There are two widespread geological units at a scale of 1:15M [1]: dissected terrain (Npld; more highly dissected by valley networks (VN) than cratered unit; covers extensive area S and W of Syr-tis Major, interpreted ...
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[1] The evolution of the Martian crustal dichotomy boundary, which separates the southern cratered highlands from the northern lowland plains by 1–3 km of elevation, remains among the fundamental outstanding issues in Mars research. For a study area at Aeolis Mensae we show that fretted terrain formed exclusively in a >2 km thick, late Noachian ( 3.7 Ga) sedimentary deposit that overlies the ba...
متن کاملGeologic history of Mars
a r t i c l e i n f o Mars accumulated and differentiated into crust, mantle and core within a few tens of millions of years of Solar System formation. Formation of Hellas, which has been adopted as the base of the Noachian period, is estimated to have occurred around 4.1 to 3.8 Gyr ago, depending on whether or not the planet experienced a late cataclysm. Little is known of the pre-Noachian per...
متن کاملExtensive Noachian fluvial systems in Arabia Terra: Implications for early Martian climate
Valley networks are some of the strongest lines of evidence for extensive fluvial activity on early (Noachian; >3.7 Ga) Mars. However, their purported absence on certain ancient terrains, such as Arabia Terra, is at variance with patterns of precipitation as predicted by “warm and wet” climate models. This disagreement has contributed to the development of an alternative “icy highlands” scenari...
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تاریخ انتشار 2006