SURFACE MINERALOGY OF DEGRADED AGRICULTURAL LANDS AFFECTED BY NATURAL ACID SALINE SEEPS, SOUTH WESTERN AUSTRALIA

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RAGHIMI M.

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Journal: Journal of Agricultural Sciences and Natural Resources Year:2006 | Volume:13 | Issue:4 Page(s): 11-19

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Title

SURFACE MINERALOGY OF DEGRADED AGRICULTURAL LANDS AFFECTED BY NATURAL ACID SALINE SEEPS, SOUTH WESTERN AUSTRALIA

Author(s)

RAGHIMI M. | Issue Writer Certificate

Keywords

ACID SALINE SEEPSQ3

IRON OXYHYDROXIDEQ3

REFLECTANCE SPECTRA (VNIR)Q2

SOUTHWESTERN AUSTRALIAQ3

Abstract

Acid and saline seeps are an increasing problem in the most part of the world and Australia as well. They are areas of bare soil or reduced crop production. Seasonal surface sampling through topo-sequence of the study area and analytical results of XRD, SEM and VNIR indicate that morphological and mineralogical changes within a natural acid saline seep affected landscape revealed that seasonal differences in surface mineralogy. These dynamic and seasonally influenced changes to surface and near surface mineralogy of an acid saline seep affected landform during the wet months, due to water logging, the sulfidization process dominates, while during the drier months, oxidative weathering of pyrite and iron hydrolysis results in precipitation of IRON OXYHYDROXIDEs at and near the surface with the generation of acidity. During the dry season, the surface mineralogy of the natural seepage zone is dominated by salts (halite), sulfates (gypsum and barite) and importantly, IRON OXYHYDROXIDEs gel precipitates and crusts (ferrihydrite, goethite, schwertmannite). The study found the IRON OXYHYDROXIDE minerals present in the surface crusts and precipitates reflect acid conditions, as opposed to halite and gypsum that reflect only saline conditions. The visible near infra-red (VNIR) reflectance spectra of the surface minerals from unaffected, salt crusted and acid seep areas, showed spectral differences expressed in the VNIR region due to absorption bands of iron oxides and hydroxides. This difference in the surface mineralogy during summer months can be readily identified via multi-spectral and hyper-spectral remote sensing methods mainly during summer, and therefore regionally mapping for identification of surface mineralogy due to spatial and temporal distribution of acid seeps, which has caused degradation of agricultural lands is suggested.

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APA: Copy

RAGHIMI, M.. (2006). SURFACE MINERALOGY OF DEGRADED AGRICULTURAL LANDS AFFECTED BY NATURAL ACID SALINE SEEPS, SOUTH WESTERN AUSTRALIA. JOURNAL OF AGRICULTURAL SCIENCES AND NATURAL RESOURCES, 13(4), 11-19. SID. https://sid.ir/paper/9803/en

Vancouver: Copy

RAGHIMI M.. SURFACE MINERALOGY OF DEGRADED AGRICULTURAL LANDS AFFECTED BY NATURAL ACID SALINE SEEPS, SOUTH WESTERN AUSTRALIA. JOURNAL OF AGRICULTURAL SCIENCES AND NATURAL RESOURCES[Internet]. 2006;13(4):11-19. Available from: https://sid.ir/paper/9803/en

IEEE: Copy

M. RAGHIMI, “SURFACE MINERALOGY OF DEGRADED AGRICULTURAL LANDS AFFECTED BY NATURAL ACID SALINE SEEPS, SOUTH WESTERN AUSTRALIA,” JOURNAL OF AGRICULTURAL SCIENCES AND NATURAL RESOURCES, vol. 13, no. 4, pp. 11–19, 2006, [Online]. Available: https://sid.ir/paper/9803/en

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