scholarly journals Blueberries on Earth and Mars: Correlations between Concretions in Navajo Sandstone and Tyerra Merdiani on Mars

2021 ◽  
Vol 27 (S1) ◽  
pp. 2258-2259
Author(s):  
Andrew Havics ◽  
William Mahaney ◽  
Dennis Netoff
Keyword(s):  
Navajo Sandstone

DYNAMIC ERG MARGIN ENVIRONMENTS OF THE JURASSIC NAVAJO SANDSTONE, SOUTHEAST UTAH

2016 ◽  
Author(s):  
Marjorie A. Chan ◽  
◽  
Stephen T. Hasiotis ◽  
Judith Totman Parrish
Keyword(s):  
Navajo Sandstone

CONSTRUCTION OF A SPRING-LAKE SYSTEM IN THE JURASSIC NAVAJO SANDSTONE, UTAH—EVIDENCE FROM STABLE ISOTOPES OF OXYGEN AND CARBON

2017 ◽  
Author(s):  
Judith Totman Parrish ◽  
◽  
Ethan G. Hyland ◽  
Marjorie A. Chan ◽  
Stephen T. Hasiotis ◽  
...  
Keyword(s):  
Stable Isotopes ◽  
Navajo Sandstone ◽  
Lake System ◽  
Spring Lake

Revising the stratigraphy at Mollies Nipple, Kane County, Utah, USA to better understand the origin of jarosite and alunite cements

2021 ◽  
Author(s):  
Jordan Walker ◽  
Sally Potter-McIntyre
Keyword(s):  
Special Interest ◽  
Depositional Environments ◽  
Navajo Sandstone ◽  
National Monument ◽  
Regional Correlation ◽  
Kane County

<p>Mollies Nipple—a butte located in the Grand Staircase-Escalante National Monument (GSENM)—is of special interest because of the presence of unusual alunite and jarosite cements within the caprock. These minerals precipitate in hyperacidic environments (pH1-2) and are not stable over ~pH5; yet they are abundant on Mars where they are used to interpret depositional and diagenetic environments. The caprock at Mollies Nipple is historically interpreted as Navajo Sandstone via photogeologic mapping; however, it is ~200 m above the mapped upper extent of the Navajo Sandstone in this region. The units overlying the Navajo Sandstone have complex stratigraphic relations in this region and the caprock could be the Carmel or Temple Cap Formations, or the Page Sandstone. This study aims to characterize Mollies Nipple through measured sections, mineralogical analyses, palynomorph analysis, and radiometric age dates from ash lenses present in the caprock. The results will better define the stratigraphy of Mollies Nipple and determine the regional correlation of the caprock. Ultimately, this work will contribute to the understanding of how alunite and jarosite were precipitated at Mollies Nipple; why these minerals are still present at Mollies Nipple, and potentially revise the understanding of Martian depositional environments.</p>

Wind directions in the Navajo Sandstone

Geology Today ◽  
1995 ◽  
Vol 11 (5) ◽  
pp. 176-176
Author(s):  
TREVOR D. FORD
Keyword(s):  
Navajo Sandstone

WEATHERING PITS VERSUS TRAMPLE MARKS: A REINTERPRETATION OF THE “DINOSAUR DANCE FLOOR”: A JURASSIC NAVAJO SANDSTONE SURFACE IN THE VERMILION CLIFFS NATIONAL MONUMENT, ARIZONA

Palaios ◽  
2021 ◽  
Vol 36 (11) ◽  
pp. 331-338
Author(s):  
BRENT H. BREITHAUPT ◽  
MARJORIE A. CHAN ◽  
WINSTON M. SEILER ◽  
NEFFRA A. MATTHEWS
Keyword(s):  
Direct Evidence ◽  
Lower Jurassic ◽  
Dance Floor ◽  
Navajo Sandstone ◽  
National Monument ◽  
A Site

ABSTRACT Within the eolian Lower Jurassic Navajo Sandstone, exposed in the Coyote Buttes area of Vermilion Cliffs National Monument in Arizona, a site (informally known as the “Dinosaur Dance Floor”) is reinterpreted as an enigmatic, modified (possibly pedogenic) eolian surface that was exposed and further modified and accentuated by modern weathering and erosion. The resultant surface is covered with small, shallow potholes or weathering pits, with no direct evidence of dinosaur activity.

Working towards a universal formation model for spheroidal iron (oxyhydr)oxide concretions

2021 ◽  
Author(s):  
Desiree Baker ◽  
Sally Potter-McIntyre
Keyword(s):  
Host Rock ◽  
Redox Reactions ◽  
Mineralogical Composition ◽  
Recent Model ◽  
Universal Model ◽  
Formation Model ◽  
Navajo Sandstone ◽  
Diagenetic Facies ◽  
A Site ◽  
Diagenetic Reactions

<p>Three principal models exist for iron (oxyhydr)oxide concretion formation in the Navajo Sandstone in southern Utah, USA and the most recent model by Yoshida et al. (2018) suggests that calcite concretions are precursors to iron (oxyhydr)oxide concretions. This model could account for the existence of a gradient of carbonate and iron concretions found in both red diagenetic facies (with primary hematite grains coatings retained) and white diagenetic facies (primary hematite grain coatings removed during diagenesis). However, evidence for calcite precursor minerals and an understanding of the fluid chemistries involved in these diagenetic reactions is lacking. This research focuses on spheroidal concretions in the Navajo Sandstone at Coyote Gulch—a site that is down gradient, but upsection from Spencer Flat (the focus of previous work) and tests the hypothesis that calcite concretions are precursors to iron (oxyhydr)oxide concretions. Bulk mineralogy, bulk geochemistry, and petrography provide elemental and mineralogical composition of the concretions and show that the concretions are calcite cemented (~40 wt.%) and the host rock is predominately iron (oxyhydr)oxide cemented (~3 wt.%). The host rock surrounding embedded concretions shows secondary iron (oxyhydr)oxide precipitation and decreases in calcite in transects away from the concretion. These relationships suggest that the calcite concretions formed prior to the precipitation of secondary iron (oxyhydr)oxides and may have provided a localized buffering environment for the precipitation of iron (oxyhydr)oxides. This study also represents an opportunity to determine a universal model for carbonate and iron (oxyhydr)oxide spheroidal concretion formation, and to understand the influence of fluid interactions in the search for subsurface redox reactions to power metabolisms on Earth and Mars.</p>

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