Martian Fluvial Conglomerates at Gale Crater

R.M.E. Williams; J.P. Grotzinger; W.E. Dietrich; S. Gupta; D.Y. Sumner; R.C. Wiens; Morten Bo Madsen; Asmus Koefoed; Jacob Krüger Jensen

doi:10.1126/science.1237317

Martian Fluvial Conglomerates at Gale Crater

R.M.E. Williams, J.P. Grotzinger, W.E. Dietrich, S. Gupta, D.Y. Sumner, R.C. Wiens, Morten Bo Madsen, Asmus Koefoed, Jacob Krüger Jensen

252 Citationer (Scopus)

Abstract

Observations by the Mars Science Laboratory Mast Camera (Mastcam) in Gale crater reveal isolated outcrops of cemented pebbles (2 to 40 millimeters in diameter) and sand grains with textures typical of fluvial sedimentary conglomerates. Rounded pebbles in the conglomerates indicate substantial fluvial abrasion. ChemCam emission spectra at one outcrop show a predominantly feldspathic composition, consistent with minimal aqueous alteration of sediments. Sediment was mobilized in ancient water flows that likely exceeded the threshold conditions (depth 0.03 to 0.9 meter, average velocity 0.20 to 0.75 meter per second) required to transport the pebbles. Climate conditions at the time sediment was transported must have differed substantially from the cold, hyper-arid modern environment to permit aqueous flows across several kilometers.

Originalsprog	Engelsk
Tidsskrift	Science
Vol/bind	340
Udgave nummer	6136
Sider (fra-til)	1068-1072
Antal sider	5
ISSN	0036-8075
DOI	https://doi.org/10.1126/science.1237317
Status	Udgivet - 31 maj 2013

FN’s Verdensmål

Dette resultat bidrager til følgende verdensmål

Adgang til dokumentet

10.1126/science.1237317

Citationsformater

@article{c8e89ec27aba42c9a99b4ce35d0bf05f,

title = "Martian Fluvial Conglomerates at Gale Crater",

abstract = "Observations by the Mars Science Laboratory Mast Camera (Mastcam) in Gale crater reveal isolated outcrops of cemented pebbles (2 to 40 millimeters in diameter) and sand grains with textures typical of fluvial sedimentary conglomerates. Rounded pebbles in the conglomerates indicate substantial fluvial abrasion. ChemCam emission spectra at one outcrop show a predominantly feldspathic composition, consistent with minimal aqueous alteration of sediments. Sediment was mobilized in ancient water flows that likely exceeded the threshold conditions (depth 0.03 to 0.9 meter, average velocity 0.20 to 0.75 meter per second) required to transport the pebbles. Climate conditions at the time sediment was transported must have differed substantially from the cold, hyper-arid modern environment to permit aqueous flows across several kilometers.",

author = "R.M.E. Williams and J.P. Grotzinger and W.E. Dietrich and S. Gupta and D.Y. Sumner and R.C. Wiens and Madsen, {Morten Bo} and Asmus Koefoed and Jensen, {Jacob Kr{\"u}ger}",

year = "2013",

month = may,

day = "31",

doi = "10.1126/science.1237317",

language = "English",

volume = "340",

pages = "1068--1072",

journal = "Science",

issn = "0036-8075",

publisher = "American Association for the Advancement of Science",

number = "6136",

}

TY - JOUR

T1 - Martian Fluvial Conglomerates at Gale Crater

AU - Williams, R.M.E.

AU - Grotzinger, J.P.

AU - Dietrich, W.E.

AU - Gupta, S.

AU - Sumner, D.Y.

AU - Wiens, R.C.

AU - Madsen, Morten Bo

AU - Koefoed, Asmus

AU - Jensen, Jacob Krüger

PY - 2013/5/31

Y1 - 2013/5/31

N2 - Observations by the Mars Science Laboratory Mast Camera (Mastcam) in Gale crater reveal isolated outcrops of cemented pebbles (2 to 40 millimeters in diameter) and sand grains with textures typical of fluvial sedimentary conglomerates. Rounded pebbles in the conglomerates indicate substantial fluvial abrasion. ChemCam emission spectra at one outcrop show a predominantly feldspathic composition, consistent with minimal aqueous alteration of sediments. Sediment was mobilized in ancient water flows that likely exceeded the threshold conditions (depth 0.03 to 0.9 meter, average velocity 0.20 to 0.75 meter per second) required to transport the pebbles. Climate conditions at the time sediment was transported must have differed substantially from the cold, hyper-arid modern environment to permit aqueous flows across several kilometers.

AB - Observations by the Mars Science Laboratory Mast Camera (Mastcam) in Gale crater reveal isolated outcrops of cemented pebbles (2 to 40 millimeters in diameter) and sand grains with textures typical of fluvial sedimentary conglomerates. Rounded pebbles in the conglomerates indicate substantial fluvial abrasion. ChemCam emission spectra at one outcrop show a predominantly feldspathic composition, consistent with minimal aqueous alteration of sediments. Sediment was mobilized in ancient water flows that likely exceeded the threshold conditions (depth 0.03 to 0.9 meter, average velocity 0.20 to 0.75 meter per second) required to transport the pebbles. Climate conditions at the time sediment was transported must have differed substantially from the cold, hyper-arid modern environment to permit aqueous flows across several kilometers.

U2 - 10.1126/science.1237317

DO - 10.1126/science.1237317

M3 - Journal article

SN - 0036-8075

VL - 340

SP - 1068

EP - 1072

JO - Science

JF - Science

IS - 6136

ER -

Martian Fluvial Conglomerates at Gale Crater

Abstract

FN’s Verdensmål

Adgang til dokumentet

Fingeraftryk

Citationsformater