Diagenetic origin of nodules in the Sheepbed member, Yellowknife Bay formation, Gale crater, Mars

被引：84

作者：

Stack, K. M. ^{[1
]}

Grotzinger, J. P. ^{[1
]}

Kah, L. C. ^{[2
]}

Schmidt, M. E. ^{[3
]}

Mangold, N. ^{[4
]}

Edgett, K. S. ^{[5
]}

Sumner, D. Y. ^{[6
]}

Siebach, K. L. ^{[1
]}

Nachon, M. ^{[4
]}

Lee, R. ^{[3
]}

Blaney, D. L. ^{[7
]}

Deflores, L. P. ^{[7
]}

Edgar, L. A. ^{[8
]}

Fairen, A. G. ^{[9
]}

Leshin, L. A. ^{[10
,11
]}

Maurice, S. ^{[12
]}

Oehler, D. Z. ^{[13
]}

Rice, M. S. ^{[1
]}

Wiens, R. C. ^{[14
]}

机构：

[1] CALTECH, Dept Geol & Planetary Sci, Pasadena, CA 91125 USA

[2] Univ Tennessee, Dept Earth & Planetary Sci, Knoxville, TN USA

[3] Brock Univ, Dept Earth Sci, St Catharines, ON L2S 3A1, Canada

[4] Univ Nantes, Lab Planetol & Geodynam Nantes, Nantes, France

[5] Malin Space Sci Syst Inc, San Diego, CA USA

[6] Univ Calif Davis, Dept Earth & Planetary Sci, Davis, CA 95616 USA

[7] CALTECH, Jet Prop Lab, Pasadena, CA USA

[8] Arizona State Univ, Sch Earth & Space Explorat, Tempe, AZ USA

[9] Cornell Univ, Dept Astron, Ithaca, NY 14853 USA

[10] Rensselaer Polytech Inst, Dept Earth & Environm Sci, Troy, NY USA

[11] Rensselaer Polytech Inst, Sch Sci, Troy, NY USA

[12] Univ Toulouse 3, Inst Rech Astrophy & Planetol Toulouse, F-31062 Toulouse, France

[13] NASA, Johnson Space Ctr, Astromat Res & Explorat Sci Directorate, Houston, TX USA

[14] Los Alamos Natl Lab, Los Alamos, NM USA

来源：

JOURNAL OF GEOPHYSICAL RESEARCH-PLANETS | 2014年 / 119卷 / 07期

关键词：

MOLAR-TOOTH STRUCTURES; BELT-PURCELL SUPERGROUP; CARBONATE CONCRETIONS; CLIMATOLOGICAL FACTORS; ISOTOPIC COMPOSITION; CALCITE CONCRETIONS; INTERNAL STRUCTURE; DUTCH PLEISTOCENE; MERIDIANI-PLANUM; MARINE-SEDIMENTS;

D O I：

10.1002/2014JE004617

中图分类号：

P3 [地球物理学]; P59 [地球化学];

学科分类号：

0708 ; 070902 ;

摘要：

The Sheepbed member of the Yellowknife Bay formation in Gale crater contains millimeter-scale nodules that represent an array of morphologies unlike those previously observed in sedimentary deposits on Mars. Three types of nodules have been identified in the Sheepbed member in order of decreasing abundance: solid nodules, hollow nodules, and filled nodules, a variant of hollow nodules whose voids have been filled with sulfate minerals. This study uses Mast Camera (Mastcam) and Mars Hand Lens Imager (MAHLI) images from the Mars Science Laboratory Curiosity rover to determine the size, shape, and spatial distribution of the Sheepbed nodules. The Alpha Particle X-Ray Spectrometer (APXS) and ChemCam instruments provide geochemical data to help interpret nodule origins. Based on their physical characteristics, spatial distribution, and composition, the nodules are interpreted as concretions formed during early diagenesis. Several hypotheses are considered for hollow nodule formation including origins as primary or secondary voids. The occurrence of concretions interpreted in the Sheepbed mudstone and in several other sedimentary sequences on Mars suggests that active groundwater systems play an important role in the diagenesis of Martian sedimentary rocks. When concretions are formed during early diagenetic cementation, as interpreted for the Sheepbed nodules, they have the potential to create a taphonomic window favorable for the preservation of Martian organics.

引用

页码：1637 / 1664

页数：28

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