Climate dependence of feldspar weathering in shale soils along a latitudinal gradient

Dere, Ashlee; White, Timothy S.; April, Richard; Reynolds, B.; Miller, Thomas E.; Knapp, Elizabeth P.; McKay, Larry D.; Brantley, Susan L.

doi:10.1016/j.gca.2013.08.001

Cited by 52 publications

(51 citation statements)

References 85 publications

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“…8c). This observation echoes with results from an earlier investigation of Phanerozoic shales collected along a latitudinal transect in the Appalachian Mountains (NE America), which showed that the degree of shale weathering was still clearly correlated with present-day climatic parameters (Dere et al, 2013). Therefore, in agreement with this latter work, our own results for the Congo River Basin would suggest that Si isotopes can still provide constraints on modern weathering and climatic parameters in sedimentary basins.…”

Section: Rivers Of Northern Irelandsupporting

confidence: 91%

The silicon isotopic composition of fine-grained river sediments and its relation to climate and lithology

Bayon

Delvigne

Ponzevera

et al. 2018

Geochimica et Cosmochimica Acta

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The d 30 Si stable isotopic composition of silicon in soils and fine-grained sediments can provide insights into weathering processes on continents, with important implications on the Si budget of modern and past oceans. To further constrain the factors controlling the distribution of Si isotopes in sediments, we have analysed a large number (n = 50) of separate size-fractions of sediments and suspended particulate materials collected near the mouth of rivers worldwide. This includes some of the world's largest rivers (e.g. Amazon, Congo, Mackenzie, Mississippi, Murray-Darling, Nile, Yangtze) and rivers from the case study areas of the Congo River Basin and Northern Ireland. Silt-size fractions exhibit a mean Si isotopic composition (d 30 Si = À0.21 ± 0.19‰; 2 s.d.) similar to that previously inferred for the upper continental crust. In contrast, clay-size fractions display a much larger range of d 30 Si values from À0.11‰ to À2.16‰, which yield a global d 30 Si clay of À0.57 ± 0.60‰ (2 s.d.) representative of the mean composition of the average weathered continental crust. Overall, these new data show that the Si isotopic signature transported by river clays is controlled by the degree of chemical weathering, as inferred from strong relationships with Al/Si ratios. At a global scale, the clay-bound Si isotopic composition of the world's largest river systems demonstrates a link with climate, defining a general correlation with mean annual temperature (MAT) in corresponding drainage basins. While the distribution of Si isotopes in river sediments also appears to be influenced by the tectonic setting, lithological effects and sediment recycling from former sedimentary cycles, our results pave the way for their use as paleo-weathering and paleo-climate proxies in the sedimentary record.

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Section: Rivers Of Northern Irelandsupporting

confidence: 91%

The silicon isotopic composition of fine-grained river sediments and its relation to climate and lithology

Bayon

Delvigne

Ponzevera

et al. 2018

Geochimica et Cosmochimica Acta

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“…1; Table 1). These sites were previously described in detail in Dere et al (2013). Mean annual temperature and MAP vary across the climosequence, with the Wales and PR end member sites exhibiting the greatest difference in climate ( Table 1).…”

Section: Climosequence Locationsmentioning

confidence: 99%

“…To maintain consistency with all samples in this study, we analyzed only augered soil samples even for those samples that were possible to retrieve from soil pits. Rock samples were obtained from outcrops near soil sampling sites or from the bottom of soil pits (see Dere et al [2013] for locations). All samples were air-dried and homogenized before chemical and physical analyses.…”

Section: Soil and Rock Samplingmentioning

confidence: 99%

“…Parent material is dominantly Silurian organic matter-poor, iron-rich Rose Hill Formation shale across sites that are currently tectonically quiescent and at relatively low elevation (240-750 m). Previous research efforts across this climosequence focused on quantifying weathering rates as a function of climate, where we observed an exponential dependence of temperature and a linear dependence of precipitation on plagioclase weathering rates (Dere et al, 2013). The aim of this paper is to document mineralogical transformations and soil development across a climosequence of shale-derived soils to identify weathering reactions controlling soil thickness and development, and to further investigate the role of climate in controlling soil formation.…”

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confidence: 97%

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Mineralogical Transformations and Soil Development in Shale across a Latitudinal Climosequence

Dere¹,

White

April³

et al. 2016

Soil Science Soc of Amer J

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PedologyTo investigate factors controlling soil formation, we established a climosequence as part of the Susquehanna-Shale Hills Critical Zone Observatory (SSHCZO) in central Pennsylvania, USA. Sites were located on organic matter-poor, iron-rich Silurian-aged shale in Wales, Pennsylvania, Virginia, Tennessee, Alabama, and Puerto Rico, although this last site is underlain by a younger shale. Across the climosequence, mean annual temperature (MAT) increases from 7 to 24°C and mean annual precipitation (MAP) ranges from 100 to 250 cm. Variations in soil characteristics along the climosequence, including depth, morphology, particle-size distribution, geochemistry, and bulk and clay mineralogy, were characterized to investigate the role of climate in controlling mineral transformations and soil formation. Overall, soil horizonation, depth, clay content, and chemical depletion increase with increasing temperature and precipitation, consistent with enhanced soil development and weathering processes in warmer and wetter locations. Secondary minerals are present at higher concentrations at the warmest sites of the climosequence; kaolinite increases from <5% at northern sites in Wales and Pennsylvania to 30% in Puerto Rico. The deepest observed weathering reaction is plagioclase feldspar dissolution followed by the transformation of chlorite and illite to vermiculite and hydroxy-interlayered vermiculite. Plagioclase, although constituting <12% of the initial shale mineralogy, may be the profile initiating reaction that begins shale bedrock transformation to weathered regolith. Weathering of the more abundant chlorite and illite minerals (~70% of initial mineralogy), however, are more likely controlling regolith thickness. Climate appears to play a central role in driving soil formation and mineral weathering reactions across the climosequence.Abbreviations: CZ, critical zone; HIV, hydroxy-interlayered vermiculite; ICP-AES, inductively coupled plasma atomic emission spectroscopy; LGM, last glacial maximum; MAP, mean annual precipitation; MAT, mean annual temperature; MCL, Materials Characterization Laboratory; SRT, soil residence time ; SSHCZO, Susquehanna-Shale Hills Critical Zone Observatory; XRD, x-ray diffraction. Q uantifying changes in the critical zone (CZ), especially soil development and function, is important for predicting the future of soils (NRC, 2001). The CZ extends from the top of the vegetation canopy to freshwater aquifers beneath Earth's surface and is the focus of most ecosystem processes that support terrestrial life . Soil formation within the CZ involves complex coupling between physical, chemical, and biological processes that are not well quantified (Amundson, 2004). Efforts to predict how future changes in climate and land use will modify the CZ are ongoing and are important aspects of developing adaptation and management plans for human society (Banwart et al., 2011 Core Ideas• Detailed characterization of the morphology, geochemistry, and mineralogy of shale-derived soils across a climosequenc...

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“…The database was originally developed in Microsoft Access for convenience and accessibility. Examples of observed variables include major and trace element and isotopic measurements from samples derived from soil cores and soil pits (e.g., Dere et al, 2013). In addition, these datasets may include physical measurements of particle size, bulk density, and soil color.…”

Section: Soil Geochemistry Use Case: Czchemdbmentioning

confidence: 99%

Enhancing Interoperability and Capabilities of Earth Science Data using the Observations Data Model 2 (ODM2)

Hsu

Mayorga

Horsburgh

et al. 2017

Data Science Journal

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Earth Science researchers require access to integrated, cross-disciplinary data in order to answer critical research questions. Partially due to these science drivers, it is common for disciplinary data systems to expand from their original scope in order to accommodate collaborative research. The result is multiple disparate databases with overlapping but incompatible data. In order to enable more complete data integration and analysis, the Observations Data Model Version 2 (ODM2) was developed to be a general information model, with one of its major goals to integrate data collected by in situ sensors with those by ex-situ analyses of field specimens. Four use cases with different science drivers and disciplines have adopted ODM2 because of benefits to their users. The disciplines behind the four cases are diverse -hydrology, rock geochemistry, soil geochemistry, and biogeochemistry. For each case, we outline the benefits, challenges, and rationale for adopting ODM2. In each case, the decision to implement ODM2 was made to increase interoperability and expand data and metadata capabilities. One of the common benefits was the ability to use the flexible handling and comprehensive description of specimens and data collection sites in ODM2's sampling feature concept. We also summarize best practices for implementing ODM2 based on the experience of these initial adopters. The descriptions here should help other potential adopters of ODM2 implement their own instances or to modify ODM2 to suit their needs.Keywords: observations; information model; data management; interoperability; cyberinfrastructure IntroductionThe magnitude and diversity of Earth science observations is increasing exponentially. This data richness is fueling new and novel studies that advance our understanding of Earth and environmental processes; however, tools for integrating, efficiently managing, properly documenting, and making such data accessible to diverse groups of collaborating scientists are still in early stages. The need for such tools is clearly shown by large collaborative projects such as the Critical Zone Observatories (e.g., Brantley et al., 2007). These projects include many investigators that produce many different types of data, much of which is often stored and managed in its own domain-specific data system or by idiosyncratic, custom approaches. While domain-specific data systems may provide advanced functionality for particular data types, working with them requires disciplinary knowledge for navigation and data access. The specificity of data types within these systems has commonly led to challenges in integrating data across systems, domains, and research groups. To achieve the science goals of these collaborative projects, however, the different data types must be compared, integrated, and analyzed across sources. Hsu et al: Enhancing Interoperability and Capabilities of Earth ScienceData using the Observations Data Model 2 (ODM2) Art. 4, page 2 of 16This need for interdisciplinary data interoperability across scientif...

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Climate dependence of feldspar weathering in shale soils along a latitudinal gradient

Cited by 52 publications

References 85 publications

The silicon isotopic composition of fine-grained river sediments and its relation to climate and lithology

The silicon isotopic composition of fine-grained river sediments and its relation to climate and lithology

Mineralogical Transformations and Soil Development in Shale across a Latitudinal Climosequence

Enhancing Interoperability and Capabilities of Earth Science Data using the Observations Data Model 2 (ODM2)

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