Inheritance and formation of smectite in a texture contrast soil in the Pilliga State Forests, New South Wales
Peter G. Walsh A B D and Geoff S. Humphreys C DA Forests NSW, PO Box 273, Eden, NSW 2551, Australia.
B School of Resources, Environment and Society, Australian National University, Canberra, ACT 0200, Australia.
C Department of Physical Geography, School of Environmental and Life Sciences, Macquarie University, NSW 2109, Australia.
D Deceased.
E Corresponding author. Email: peterwa@sf.nsw.gov.au
Australian Journal of Soil Research 48(1) 88-99 https://doi.org/10.1071/SR09059
Submitted: 7 April 2009 Accepted: 21 September 2009 Published: 26 February 2010
Abstract
Smectite genesis is generally considered to require an alkaline environment, for in acid environments it is reportedly unstable. This study shows that smectite is forming in an acid, texture-contrast soil in the Pilliga State Forests in north-western New South Wales. Three modes of smectite genesis in the study soil are presented. The first mode involves direct inheritance from the underlying parent rock. The second and third modes involve precipitation of smectite from solution and its deposition from suspension, respectively. While the bulk of the smectite in the study soil is inherited from the transformation of labile primary minerals and rock fragments in the parent rock, restricted drainage coupled with a parent material capable of supplying the elemental constituents of smectite are also important factors in its genesis.
Acknowledgments
The study was partially funded by a postgraduate research grant from Macquarie University, NSW. Thanks to Dr Pat Conaghan for his invaluable assistance with the petrological interpretation and for taking photomicrographs, Forests NSW for permission to work in the Pilliga East State Forest, Mr Tom Bradley for the manufacture of the thin-sections, and the 3 anonymous reviewers for their helpful comments on an earlier version of the manuscript.
Arditto PA
(1982) Deposition and diagenesis of the Jurassic Pilliga Sandstone in the southeastern Surat Basin, New South Wales. Journal of the Geological Society of Australia 29, 191–203.
|
CAS |
Arditto PA
(1983) Mineral-groundwater interactions and the formation of authigenic kaolinite within the southeastern intake beds of the Great Australian Basin, New South Wales, Australia. Sedimentary Geology 35, 249–261.
| Crossref | GoogleScholarGoogle Scholar |
CAS |
Carrigy MA, Mellon GB
(1964) Authigenic clay mineral cements in Cretaceous and Tertiary sandstones of Alberta. Journal of Sedimentary Petrology 34(3), 461–472.
Egli M,
Mirabella A,
Mancabelli A, Sartori A
(2004) Weathering of soils in alpine areas as influenced by climate and parent material. Clays and Clay Minerals 52(3), 287–303.
|
CAS |
Crossref |
Egli M,
Mirabella A,
Sartori A,
Zanelli R, Bischof S
(2006) Effect of north and south exposure on weathering rates and clay mineral formation in Alpine soils. Catena 35(3), 155–174.
| Crossref |
Hart DM
(1995) Litterfall and decomposition in the Pilliga State Forests, New South Wales, Australia. Australian Journal of Ecology 20, 266–272.
| Crossref | GoogleScholarGoogle Scholar |
Karathanasis AD, Hajek BF
(1983) Transformation of smectite to kaolinite in naturally acid soil systems: structural and thermodynamic considerations. Soil Science Society of America Journal 47, 158–163.
|
CAS |
Karathanasis AD, Hajek BF
(1984) Evaluation of aluminium-smectite stability equilibria in naturally acid soils. Soil Science Society of America Journal 48, 413–417.
|
CAS |
Matlack KS,
Houseknecht DW, Applin KR
(1989) Emplacement of clay into sand by infiltration. Journal of Sedimentary Petrology 59, 77–87.
Moraes AS, De Ros LF
(1990) Infiltrated clays in fluvial Jurassic sandstones of Reconcavo Basin, Northeastern Brazil. Journal of Sedimentary Petrology 60, 809–819.
Rice TJ,
Buol SW, Weed SB
(1985) Soil-saprolite profiles derived from mafic rocks in the North Carolina Peidmont: I. Chemical, morphological and mineralogical characteristics and transformation. Soil Science Society of America Journal 49, 171–178.
|
CAS |
Righi D,
Huber K, Keller C
(1999) Clay formation and podzol development from postglacial moraines in Switzerland. Clay Minerals 34(2), 319–332.
|
CAS |
Crossref |
Wilson MD, Pittman ED
(1977) Authigenic clays in sandstones: recognition and influence on reservoir properties and paleoenvironmental analysis. Journal of Sedimentary Petrology 47, 3–31.
|
CAS |