Mars North Polar Deposits: Stratigraphy, Age, and Geodynamical Response | Zendy

R. J. Phillips | Zendy; M. T. Zuber | Zendy; S. E. Smrekar | Zendy; M. T. Mellon | Zendy; J. W. Head | Zendy; Kenneth L. Tanaka | Zendy; N. E. Putzig | Zendy; S. M. Milkovich | Zendy; B. A. Campbell | Zendy; J. J. Plaut | Zendy; A. Safaeinili | Zendy; R. Seu | Zendy; D. Biccari | Zendy; Lynn M. Carter | Zendy; G. Picardi | Zendy; R. Orosei | Zendy; P. Surdas Mohit | Zendy; Essam Heggy | Zendy; Richard W. Zurek | Zendy; A. F. Egan | Zendy; Emanuele Giacomoni | Zendy; Federica Russo | Zendy; M. Cutigni | Zendy; Elena Pettinelli | Zendy; J. W. Holt | Zendy; Carl Leuschen | Zendy; L. Marinangeli | Zendy

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Mars North Polar Deposits: Stratigraphy, Age, and Geodynamical Response

Author(s) -

R. J. Phillips,

M. T. Zuber,

S. E. Smrekar,

M. T. Mellon,

J. W. Head,

Kenneth L. Tanaka,

N. E. Putzig,

S. M. Milkovich,

B. A. Campbell,

J. J. Plaut,

A. Safaeinili,

R. Seu,

D. Biccari,

Lynn M. Carter,

G. Picardi,

R. Orosei,

P. Surdas Mohit,

Essam Heggy,

Richard W. Zurek,

A. F. Egan,

Emanuele Giacomoni,

Federica Russo,

M. Cutigni,

Elena Pettinelli,

J. W. Holt,

Carl Leuschen,

L. Marinangeli

Publication year - 2008

Publication title -

science

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 12.556

H-Index - 1186

eISSN - 1095-9203

pISSN - 0036-8075

DOI - 10.1126/science.1157546

Subject(s) - mars exploration program , geology , mantle (geology) , orbiter , impact crater , lithosphere , martian , snow , geophysics , polar , stratigraphy , radar , geomorphology , astrobiology , paleontology , tectonics , physics , aerospace engineering , astronomy , engineering , telecommunications , computer science

The Shallow Radar (SHARAD) on the Mars Reconnaissance Orbiter has imaged the internal stratigraphy of the north polar layered deposits of Mars. Radar reflections within the deposits reveal a laterally continuous deposition of layers, which typically consist of four packets of finely spaced reflectors separated by homogeneous interpacket regions of nearly pure ice. The packet/interpacket structure can be explained by approximately million-year periodicities in Mars' obliquity or orbital eccentricity. The observed approximately 100-meter maximum deflection of the underlying substrate in response to the ice load implies that the present-day thickness of an equilibrium elastic lithosphere is greater than 300 kilometers. Alternatively, the response to the load may be in a transient state controlled by mantle viscosity. Both scenarios probably require that Mars has a subchondritic abundance of heat-producing elements.

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