Micromorphological investigation of pedogenic barite in Mormon Mesa petrocalcic horizons, Nevada USA: Implication for genesis

Brock-Hon, Amy L.; Robins, Colin R.; Buck, Brenda J.

doi:10.1016/j.geoderma.2012.02.012

Cited by 23 publications

(21 citation statements)

References 51 publications

(69 reference statements)

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“…The role of at least some of these elements, especially Na, Cl, and Ba, in the Mormon Mesa soil profile is confirmed by chemical data (Tables 1 and 2, Fig. 3), and by the occurrence of authigenic barite in many samples (Brock, 2007;Robins, 2010;Brock-Hon et al, 2012). Chemical data, especially the higher EC, Cl~, and SO^^" values in the lower, transitional horizon (Tables 3 and 4, Fig.…”

Section: Barite Neoformationmentioning

confidence: 75%

“…7), could locally promote barite precipitation and would explain the close spatial association between barite and the clays documented in Fig. 5G and by Brock-Hon et al (2012). Soil solution conditions during the dynamic evolution ofthe ~4 to 5 Ma Mormon Mesa soil, especially during warmer, more arid interpluvial episodes ofthe Pleistocene, could produce episodic increases in atmospherically-sourced, dissolved Ba inputs to the soil (Brock, 2007) as depicted in Fig.…”

Section: Barite Neoformationmentioning

confidence: 91%

“…For instance, soil pH values >8.3 generally indicate the presence of soluble NajCOj (Brady and Weil, 2008), suggesting the very probable influence of Na and other ions on soil chemical processes. Such alkaline conditions are likely maximized during arid, interpluvial climate episodes when there is greater dust and salt influx from playa sources upwind ofthe mesa surface (e.g., Reheis and Kihl, 1995;Reheis et al, 2002;Brock-Hon et al, 2012). As summarized by BrockHon et al (2012), Ba ions reaching Mormon Mesa in eolian dust may have been derived from both distant and regional sources, including Ba-rich volcanic rocks, playa sediments, Mn oxides in desert varnish, and other materials (Junge and Werby, 1958;Smith, 1981;Reheis et al, 2002;Reynolds et al, 2006).…”

Section: Barite Neoformationmentioning

confidence: 99%

“…3; see also Brock, 2007;Brock-Hon et al, 2012). Although barite has traditionally been considered insoluble in most soil environments (Lynn et al, 1971;KabataPendias, 2000), dissolved halite can measurably increase barite solubility and mobility (e.g.. Stoops and Zavaleta, 1978;Blount, 1977;Sullivan and Koppi, 1993;Deutsche, 1997;Hanor, 2000).…”

Section: Barite Neoformationmentioning

confidence: 99%

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Conceptual Mineral Genesis Models for Calcic Pendants and Petrocalcic Horizons, Nevada

Robins

Brock-Hon

Buck

2012

Soil Sci. Soc. Am. j.

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We use the very old, extant. Stage VI Mormon Mesa petrocalcic soil profile in southern Nevada to: (i) present a conceptual model summarizing known spatial and temporal relationships among authigenic calcite (or low-Mg calcite), palygorskite and/or sepiolite, and amorphous silica and (ii) adapt a second model to describe the occurrence of pedogenic barite and the effect of climate oscillations on soil mineralogy at Mormon Mesa. These conceptual models, one compiled from previous research, one built from new data in this study, directly address the importance of dust to soil genesis, especially the control of salt flux and high pH on Ba, Si, and Al mobility in alkaline soil solutions. Authigenesis of calcite and palygorskite/sepiolite creates positive feedbacks with soil solution chemistry that drives further mineralogical development. We explain the occurrence of pedogenic barite at Mormon Mesa based on higher Ba solubility and translocation into the soil profile with increased concentrations of CI and Mg in soil solutions during interpluvial climates. Development of integrated, mineral development models illustrates individual system components and/or processes that should be targeted for future chemical, biological, geochronologic, or micromorphological study, and provides a basis for comparison of calcic soil genesis from disparate sites around the world.

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Section: Barite Neoformationmentioning

confidence: 75%

Section: Barite Neoformationmentioning

confidence: 91%

Section: Barite Neoformationmentioning

confidence: 99%

Section: Barite Neoformationmentioning

confidence: 99%

See 2 more Smart Citations

Conceptual Mineral Genesis Models for Calcic Pendants and Petrocalcic Horizons, Nevada

Robins

Brock-Hon

Buck

2012

Soil Sci. Soc. Am. j.

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show abstract

“…However, these data are not included because the carbon coat, and the pervasive, fine overgrowths of carbonate and magnesium-rich phyllosilicates rendered most EDS analyses of ooid laminae or pisoid layers into similar spectra, all containing C, Ca, Mg, Al, Si, and O in variable amounts. Additionally, EDS and X-ray diffraction (XRD) analyses of various horizons and particle-size fractions of the MM and/or JLM soils have been published by previous researchers (e.g., Monger and Daugherty, 1991a,b;Brock-Hon et al, 2012;Robins et al, 2012;Robins et al, 2014). Approximately 130 SEM images were collected as part of this study.…”

Section: Methodsmentioning

confidence: 99%