Origin and composition of three heterolithic boulder- and cobble-bearing deposits overlying the Murray and Stimson formations, Gale Crater, Mars

Research output: Contribution to journalJournal articleResearchpeer-review

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Origin and composition of three heterolithic boulder- and cobble-bearing deposits overlying the Murray and Stimson formations, Gale Crater, Mars. / Wiens, Roger C.; Edgett, Kenneth S.; Stack, Kathryn M.; Dietrich, William E.; Bryk, Alexander B.; Mangold, Nicolas; Bedford, Candice; Gasda, Patrick; Fairen, Alberto; Thompson, Lucy; Johnson, Jeff; Gasnault, Olivier; Clegg, Sam; Cousin, Agnes; Forni, Olivier; Frydenvang, Jens; Lanza, Nina; Maurice, Sylvestre; Newsom, Horton; Ollila, Ann; Payré, Valerie; Rivera-Hernandez, Frances; Vasavada, Ashwin.

In: Icarus, Vol. 350, 113897, 01.11.2020.

Research output: Contribution to journalJournal articleResearchpeer-review

Harvard

Wiens, RC, Edgett, KS, Stack, KM, Dietrich, WE, Bryk, AB, Mangold, N, Bedford, C, Gasda, P, Fairen, A, Thompson, L, Johnson, J, Gasnault, O, Clegg, S, Cousin, A, Forni, O, Frydenvang, J, Lanza, N, Maurice, S, Newsom, H, Ollila, A, Payré, V, Rivera-Hernandez, F & Vasavada, A 2020, 'Origin and composition of three heterolithic boulder- and cobble-bearing deposits overlying the Murray and Stimson formations, Gale Crater, Mars', Icarus, vol. 350, 113897. https://doi.org/10.1016/j.icarus.2020.113897

APA

Wiens, R. C., Edgett, K. S., Stack, K. M., Dietrich, W. E., Bryk, A. B., Mangold, N., ... Vasavada, A. (2020). Origin and composition of three heterolithic boulder- and cobble-bearing deposits overlying the Murray and Stimson formations, Gale Crater, Mars. Icarus, 350, [113897]. https://doi.org/10.1016/j.icarus.2020.113897

Vancouver

Wiens RC, Edgett KS, Stack KM, Dietrich WE, Bryk AB, Mangold N et al. Origin and composition of three heterolithic boulder- and cobble-bearing deposits overlying the Murray and Stimson formations, Gale Crater, Mars. Icarus. 2020 Nov 1;350. 113897. https://doi.org/10.1016/j.icarus.2020.113897

Author

Wiens, Roger C. ; Edgett, Kenneth S. ; Stack, Kathryn M. ; Dietrich, William E. ; Bryk, Alexander B. ; Mangold, Nicolas ; Bedford, Candice ; Gasda, Patrick ; Fairen, Alberto ; Thompson, Lucy ; Johnson, Jeff ; Gasnault, Olivier ; Clegg, Sam ; Cousin, Agnes ; Forni, Olivier ; Frydenvang, Jens ; Lanza, Nina ; Maurice, Sylvestre ; Newsom, Horton ; Ollila, Ann ; Payré, Valerie ; Rivera-Hernandez, Frances ; Vasavada, Ashwin. / Origin and composition of three heterolithic boulder- and cobble-bearing deposits overlying the Murray and Stimson formations, Gale Crater, Mars. In: Icarus. 2020 ; Vol. 350.

Bibtex

@article{b26f823f77884c5e98025ead87344d80,
title = "Origin and composition of three heterolithic boulder- and cobble-bearing deposits overlying the Murray and Stimson formations, Gale Crater, Mars",
abstract = "Heterolithic, boulder-containing, pebble-strewn surfaces occur along the lower slopes of Aeolis Mons (“Mt. Sharp”) in Gale crater, Mars. They were observed in HiRISE images acquired from orbit prior to the landing of the Curiosity rover. The rover was used to investigate three of these units named Blackfoot, Brandberg, and Bimbe between sols 1099 and 1410. These unconsolidated units overlie the lower Murray formation that forms the base of Mt. Sharp, and consist of pebbles, cobbles and boulders. Blackfoot also overlies portions of the Stimson formation, which consists of eolian sandstone that is understood to significantly postdate the dominantly lacustrine deposition of the Murray formation. Blackfoot is elliptical in shape (62 × 26 m), while Brandberg is nearly circular (50 × 55 m), and Bimbe is irregular in shape, covering about ten times the area of the other two. The largest boulders are 1.5–2.5 m in size and are interpreted to be sandstones. As seen from orbit, some boulders are light-toned and others are dark-toned. Rover-based observations show that both have the same gray appearance from the ground and their apparently different albedos in orbital observations result from relatively flat sky-facing surfaces. Chemical observations show that two clasts of fine sandstone at Bimbe have similar compositions and morphologies to nine ChemCam targets observed early in the mission, near Yellowknife Bay, including the Bathurst Inlet outcrop, and to at least one target (Pyramid Hills, Sol 692) and possibly a cap rock unit just north of Hidden Valley, locations that are several kilometers apart in distance and tens of meters in elevation. These findings may suggest the earlier existence of draping strata, like the Stimson formation, that would have overlain the current surface from Bimbe to Yellowknife Bay. Compositionally these extinct strata could be related to the Siccar Point group to which the Stimson formation belongs. Dark, massive sandstone blocks at Bimbe are chemically distinct from blocks of similar morphology at Bradbury Rise, except for a single float block, Oscar (Sol 516). Conglomerates observed along a low, sinuous ridge at Bimbe consist of matrix and clasts with compositions similar to the Stimson formation, suggesting that stream beds likely existed nearly contemporaneously with the dunes that eventually formed the Stimson formation, or that they had the same source material. In either case, they represent a later pulse of fluvial activity relative to the lakes associated with the Murray formation. These three units may be local remnants of infilled impact craters (especially circular-shaped Brandberg), decayed buttes, patches of unconsolidated fluvial deposits, or residual mass-movement debris. Their incorporation of Stimson and Murray rocks, the lack of lithification, and appearance of being erosional remnants suggest that they record erosion and deposition events that post-date the exposure of the Stimson formation.",
keywords = "Curiosity rover, Gale crater, Greenheugh pediment, Heterolithic unit, Murray formation, Stimson formation",
author = "Wiens, {Roger C.} and Edgett, {Kenneth S.} and Stack, {Kathryn M.} and Dietrich, {William E.} and Bryk, {Alexander B.} and Nicolas Mangold and Candice Bedford and Patrick Gasda and Alberto Fairen and Lucy Thompson and Jeff Johnson and Olivier Gasnault and Sam Clegg and Agnes Cousin and Olivier Forni and Jens Frydenvang and Nina Lanza and Sylvestre Maurice and Horton Newsom and Ann Ollila and Valerie Payr{\'e} and Frances Rivera-Hernandez and Ashwin Vasavada",
year = "2020",
month = "11",
day = "1",
doi = "10.1016/j.icarus.2020.113897",
language = "English",
volume = "350",
journal = "Icarus",
issn = "0019-1035",
publisher = "Elsevier",

}

RIS

TY - JOUR

T1 - Origin and composition of three heterolithic boulder- and cobble-bearing deposits overlying the Murray and Stimson formations, Gale Crater, Mars

AU - Wiens, Roger C.

AU - Edgett, Kenneth S.

AU - Stack, Kathryn M.

AU - Dietrich, William E.

AU - Bryk, Alexander B.

AU - Mangold, Nicolas

AU - Bedford, Candice

AU - Gasda, Patrick

AU - Fairen, Alberto

AU - Thompson, Lucy

AU - Johnson, Jeff

AU - Gasnault, Olivier

AU - Clegg, Sam

AU - Cousin, Agnes

AU - Forni, Olivier

AU - Frydenvang, Jens

AU - Lanza, Nina

AU - Maurice, Sylvestre

AU - Newsom, Horton

AU - Ollila, Ann

AU - Payré, Valerie

AU - Rivera-Hernandez, Frances

AU - Vasavada, Ashwin

PY - 2020/11/1

Y1 - 2020/11/1

N2 - Heterolithic, boulder-containing, pebble-strewn surfaces occur along the lower slopes of Aeolis Mons (“Mt. Sharp”) in Gale crater, Mars. They were observed in HiRISE images acquired from orbit prior to the landing of the Curiosity rover. The rover was used to investigate three of these units named Blackfoot, Brandberg, and Bimbe between sols 1099 and 1410. These unconsolidated units overlie the lower Murray formation that forms the base of Mt. Sharp, and consist of pebbles, cobbles and boulders. Blackfoot also overlies portions of the Stimson formation, which consists of eolian sandstone that is understood to significantly postdate the dominantly lacustrine deposition of the Murray formation. Blackfoot is elliptical in shape (62 × 26 m), while Brandberg is nearly circular (50 × 55 m), and Bimbe is irregular in shape, covering about ten times the area of the other two. The largest boulders are 1.5–2.5 m in size and are interpreted to be sandstones. As seen from orbit, some boulders are light-toned and others are dark-toned. Rover-based observations show that both have the same gray appearance from the ground and their apparently different albedos in orbital observations result from relatively flat sky-facing surfaces. Chemical observations show that two clasts of fine sandstone at Bimbe have similar compositions and morphologies to nine ChemCam targets observed early in the mission, near Yellowknife Bay, including the Bathurst Inlet outcrop, and to at least one target (Pyramid Hills, Sol 692) and possibly a cap rock unit just north of Hidden Valley, locations that are several kilometers apart in distance and tens of meters in elevation. These findings may suggest the earlier existence of draping strata, like the Stimson formation, that would have overlain the current surface from Bimbe to Yellowknife Bay. Compositionally these extinct strata could be related to the Siccar Point group to which the Stimson formation belongs. Dark, massive sandstone blocks at Bimbe are chemically distinct from blocks of similar morphology at Bradbury Rise, except for a single float block, Oscar (Sol 516). Conglomerates observed along a low, sinuous ridge at Bimbe consist of matrix and clasts with compositions similar to the Stimson formation, suggesting that stream beds likely existed nearly contemporaneously with the dunes that eventually formed the Stimson formation, or that they had the same source material. In either case, they represent a later pulse of fluvial activity relative to the lakes associated with the Murray formation. These three units may be local remnants of infilled impact craters (especially circular-shaped Brandberg), decayed buttes, patches of unconsolidated fluvial deposits, or residual mass-movement debris. Their incorporation of Stimson and Murray rocks, the lack of lithification, and appearance of being erosional remnants suggest that they record erosion and deposition events that post-date the exposure of the Stimson formation.

AB - Heterolithic, boulder-containing, pebble-strewn surfaces occur along the lower slopes of Aeolis Mons (“Mt. Sharp”) in Gale crater, Mars. They were observed in HiRISE images acquired from orbit prior to the landing of the Curiosity rover. The rover was used to investigate three of these units named Blackfoot, Brandberg, and Bimbe between sols 1099 and 1410. These unconsolidated units overlie the lower Murray formation that forms the base of Mt. Sharp, and consist of pebbles, cobbles and boulders. Blackfoot also overlies portions of the Stimson formation, which consists of eolian sandstone that is understood to significantly postdate the dominantly lacustrine deposition of the Murray formation. Blackfoot is elliptical in shape (62 × 26 m), while Brandberg is nearly circular (50 × 55 m), and Bimbe is irregular in shape, covering about ten times the area of the other two. The largest boulders are 1.5–2.5 m in size and are interpreted to be sandstones. As seen from orbit, some boulders are light-toned and others are dark-toned. Rover-based observations show that both have the same gray appearance from the ground and their apparently different albedos in orbital observations result from relatively flat sky-facing surfaces. Chemical observations show that two clasts of fine sandstone at Bimbe have similar compositions and morphologies to nine ChemCam targets observed early in the mission, near Yellowknife Bay, including the Bathurst Inlet outcrop, and to at least one target (Pyramid Hills, Sol 692) and possibly a cap rock unit just north of Hidden Valley, locations that are several kilometers apart in distance and tens of meters in elevation. These findings may suggest the earlier existence of draping strata, like the Stimson formation, that would have overlain the current surface from Bimbe to Yellowknife Bay. Compositionally these extinct strata could be related to the Siccar Point group to which the Stimson formation belongs. Dark, massive sandstone blocks at Bimbe are chemically distinct from blocks of similar morphology at Bradbury Rise, except for a single float block, Oscar (Sol 516). Conglomerates observed along a low, sinuous ridge at Bimbe consist of matrix and clasts with compositions similar to the Stimson formation, suggesting that stream beds likely existed nearly contemporaneously with the dunes that eventually formed the Stimson formation, or that they had the same source material. In either case, they represent a later pulse of fluvial activity relative to the lakes associated with the Murray formation. These three units may be local remnants of infilled impact craters (especially circular-shaped Brandberg), decayed buttes, patches of unconsolidated fluvial deposits, or residual mass-movement debris. Their incorporation of Stimson and Murray rocks, the lack of lithification, and appearance of being erosional remnants suggest that they record erosion and deposition events that post-date the exposure of the Stimson formation.

KW - Curiosity rover

KW - Gale crater

KW - Greenheugh pediment

KW - Heterolithic unit

KW - Murray formation

KW - Stimson formation

UR - http://www.scopus.com/inward/record.url?scp=85086426485&partnerID=8YFLogxK

U2 - 10.1016/j.icarus.2020.113897

DO - 10.1016/j.icarus.2020.113897

M3 - Journal article

C2 - 32606479

AN - SCOPUS:85086426485

VL - 350

JO - Icarus

JF - Icarus

SN - 0019-1035

M1 - 113897

ER -

ID: 243855826