Genesis of Soils Formed from Mafic Igneous Rock in the Atlantic Forest Environment

Santos, Adailde do Carmo; Pereira, Marcos Gervásio; Anjos, Lúcia Helena Cunha dos; Bernini, Thiago Andrade; Cooper, Miguel

doi:10.1590/18069657rbcs20150056

Cited by 10 publications

(3 citation statements)

References 21 publications

(25 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Zr had a similar behavior to Rb, but the increase down the soil profile was less expressive. Zr as zirconite is considered one of the most resistant minerals to weathering and, hence, it is commonly used in studies involving soil genesis (Stockmann et al, 2016; Santos et al, 2016).…”

Section: Resultsmentioning

confidence: 99%

Tropical Soil Toposequence Characterization via pXRF Spectrometry

Silva¹,

Weindorf

Silva³

et al. 2019

Soil Science Soc of Amer J

View full text Add to dashboard Cite

Variability of elemental composition in a toposequence of quartzite‐derived soils in a tropical environment was evaluated via portable x‐ray fluorescence (pXRF) spectrometry. The toposequence featured different degrees of weathering and variable soil formation processes. Specifically, this study aimed to: (i) use elemental composition obtained through pXRF as a tool to investigate the degrees of weathering–leaching and pedogenic processes; and (ii) correlate elemental data with physicochemical properties of soils. Four soil profiles (Lithic Ustorthent, Typic Ustorthent, Typic Dystrudept, and Xanthic Hapludox) were described and sampled. Laboratory analysis for soil physicochemical characterization and pXRF were performed. Soils featured high contents of SiO2 due to the predominance of quartz in the rock. However, pXRF analysis revealed that the soils showed a decrease in such content with depth. Potassium contents tended to be greater in the C horizons since they are less weathered and retained greater amounts of K‐bearing minerals, such as muscovite. Al, Fe, Ca, Ti, Cu, and Sr increased their contents with increasing clay content in soils, while Zr generally remained stable. Ba was leached out of soils during weathering. Both CaO and Sr were positively correlated with exchangeable contents of Ca2+ and Mg2+, base saturation, pH, and cation exchange capacity, while inversely correlated to Al3+ saturation. Fe, Al, Ti, Ca, K, Cu, Rb, and Zr accumulated in soil in comparison with the parent material. Variability of elemental contents in soils with differential degrees of weathering–leaching can be easily accessed with pXRF and such data correlate well with several soil physicochemical properties. Core Ideas Toposequence of quartzite‐derived soils variability assessed by pXRF. Soils presented varying weathering degrees, from Entisols to Oxisols. pXRF elemental data correlated well with soil physical and chemical properties. Soil mineralogy and pXRF data elucidated soils variability with weathering. Al, Fe, Ca, Ti, Cu, and Sr increased with increasing clay content.

show abstract

Section: Resultsmentioning

confidence: 99%

Tropical Soil Toposequence Characterization via pXRF Spectrometry

Silva¹,

Weindorf

Silva³

et al. 2019

Soil Science Soc of Amer J

View full text Add to dashboard Cite

show abstract

“…Carbonates were present in low levels and were absent in some horizons this is due to the composition of the parent material Table 3. In all the profiles (Except P2) The value of pH at surface horizons higher than the subsurface horizons, this is actually opposite to the normal state, it is widely known that trees acidify the soil [33] and the decomposition of coniferous leaf residues is more acidic than in broad trees leaves [34]. The pH values in A11 horizon of P1 is about 8.15 and then decreases on the A12 horizon to return to 7.85.…”

Section: Chemical Propertiesmentioning

confidence: 88%

Characterization and Classification of Some Soils Formed on Ophiolitc Rocks in Al-Bassit Region /Northwestern Syria

Ghanem,

Ibrahim

2023

IOP Conf. Ser.: Earth Environ. Sci.

View full text Add to dashboard Cite

The aim of this study is to characterize and classify soils formed from ophiolitic rocks (mafic and ultramafic) by determining their morphological, physical and chemical properties, petrographic and elemental composition studies. The profiles were prepared under forest vegetation (pines) and described based on the referenced methods in Al-Bassit region (NW Syria) between the coordinates: N: 35° 41` - N: 35° 57`, E: 35° 42` - E: 36° 05`, which belongs to Mediterranean climate regime. Samples were collected from horizons of all profiles and some physical and chemical analyses were performed in addition to petrographic and Chemical composition studies. The horizons were of the form A (Mollic)-Cr-R in profile P1, and A (Mollic)-BW-C- in the profile P2, and of the form A ((Mollic)-C1-Cr2- in the profile P3. They were ordered as: A(Ochric)-C1-C2 in the profile P4. The fires that took place in the region affected the characteristics of surface horizons of some soils, such as the percentage of organic matter, structure, and the degree of soil interaction .The ultramafic derived soils in the P1 profile contained a high level of clay, while the percentage of sand increased in mafic derived soil P2, P4. The soil contained high levels of exchangeable Ca+2 and Mg+2, likely because they are in the structure of the rock. Carbonates are in low levels and are absent in some horizons, this is due to the composition of the parent material. The soil classification for studied profiles show that the profiles (P1, P2, P3) classified as Mollisols and the Profile P4 as Entisols.

show abstract

“…Properties of all profiles suggested ferralitization, such as a relative decrease in silicon oxide (SiO 2 ), increase in Δ4Si%, and base content (MgO, CaO, and K 2 O) stemming from the increased solubility of these compounds in soil and their removal by leaching (desilication). The RA%, as well as the Fe 2 O 3 , Al 2 O 3 , TiO 2 , and (MnO) oxide contents increased because of the decreased solubility and/or increased resistance of minerals such as ilmenite (FeTiO 3 ) and rutile (TiO 2 ) to weathering, (Buol et al, 2011;Dortzbach et al, 2016;Santos et al, 2016a;Camêlo et al, 2017;Kögel-Knabner and Amelung, 2021).…”

Section: Discussionmentioning

confidence: 99%