火星南极层状沉积物的堆积与侵蚀。

Accumulation and erosion of Mars' south polar layered deposits.

作者信息

Seu Roberto, Phillips Roger J, Alberti Giovanni, Biccari Daniela, Bonaventura Francesco, Bortone Marco, Calabrese Diego, Campbell Bruce A, Cartacci Marco, Carter Lynn M, Catallo Claudio, Croce Anna, Croci Renato, Cutigni Marco, Di Placido Antonio, Dinardo Salvatore, Federico Costanzo, Flamini Enrico, Fois Franco, Frigeri Alessandro, Fuga Oreste, Giacomoni Emanuele, Gim Yonggyu, Guelfi Mauro, Holt John W, Kofman Wlodek, Leuschen Carlton J, Marinangeli Lucia, Marras Paolo, Masdea Arturo, Mattei Stefania, Mecozzi Riccardo, Milkovich Sarah M, Morlupi Antonio, Mouginot Jérémie, Orosei Roberto, Papa Claudio, Paternò Tobia, Persi del Marmo Paolo, Pettinelli Elena, Pica Giulia, Picardi Giovanni, Plaut Jeffrey J, Provenziani Marco, Putzig Nathaniel E, Russo Federica, Safaeinili Ali, Salzillo Giuseppe, Santovito Maria Rosaria, Smrekar Suzanne E, Tattarletti Barbara, Vicari Danilo

机构信息

Dipartimento INFOCOM, Università di Roma "La Sapienza," I-00184 Rome, Italy.

出版信息

Science. 2007 Sep 21;317(5845):1715-8. doi: 10.1126/science.1144120.

DOI:10.1126/science.1144120

PMID:17885128

Abstract

Mars' polar regions are covered with ice-rich layered deposits that potentially contain a record of climate variations. The sounding radar SHARAD on the Mars Reconnaissance Orbiter mapped detailed subsurface stratigraphy in the Promethei Lingula region of the south polar plateau, Planum Australe. Radar reflections interpreted as layers are correlated across adjacent orbits and are continuous for up to 150 kilometers along spacecraft orbital tracks. The reflectors are often separated into discrete reflector sequences, and strong echoes are seen as deep as 1 kilometer. In some cases, the sequences are dipping with respect to each other, suggesting an interdepositional period of erosion. In Australe Sulci, layers are exhumed, indicating recent erosion.

摘要

火星的极地地区覆盖着富含冰的层状沉积物，这些沉积物可能包含气候变化的记录。火星勘测轨道飞行器上的探地雷达SHARAD绘制了南极高原普罗米修斯舌状地区（即南盘原）详细的地下地层图。被解释为层的雷达反射在相邻轨道间具有相关性，并且沿着航天器轨道轨迹连续长达150公里。这些反射器常常被分成离散的反射器序列，并且在深达1公里处都能看到强烈的回波。在某些情况下，这些序列相互倾斜，这表明存在沉积期之间的侵蚀作用。在南盘原槽沟中，各层被挖掘出来，这表明近期存在侵蚀现象。