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Journal Article

GEOCHEMICAL PERSPECTIVE ON ORIGINS AND CONSEQUENCES OF HEUWELTJIE FORMATION IN THE SOUTHWESTERN CAPE, SOUTH AFRICA Available to Purchase

J.J. MIDGLEY, C. HARRIS, A. HARINGTON, A.J. POTTS
Published: 01 December 2012
South African Journal of Geology (2012) 115 (4): 577–588.
DOI: https://doi.org/10.2113/gssajg.115.4.577
...J.J. MIDGLEY; C. HARRIS; A. HARINGTON; A.J. POTTS Abstract Heuweltjies are large (20 m diameter) raised mounds, spread throughout much of the South-West Cape region of South Africa. Many heuweltjies have a thick basal calcrete layer. Our analyses of this calcrete layer indicate at the landscape...
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View PDF for article title, GEOCHEMICAL PERSPECTIVE ON ORIGINS AND CONSEQUENCES OF <span class="search-highlight">HEUWELTJIE</span> FORMATION IN THE SOUTHWESTERN CAPE, SOUTH AFRICA
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(a) photo of heuweltjie 1.5 m above off-heuweltjie area (b) photo of exhumed heuweltjie calcrete plate (c) Photomicrograph (plane polarised light) of sample H5 showing relatively high content of detrital grains. (d) Photomicrograph (plane polarised light) of sample H4 showing layering in calcite-rich calcrete. Lower layer contains rounded concretions of calcite ~0.05 mm diameter. Upper layer is richer in detrital minerals (quartz and feldspar). What appears to be a crack is now filled with calcite.

( a ) photo of heuweltjie 1.5 m above off-heuweltjie area ( b ) photo of ex... Available to Purchase

Published: 01 December 2012
Figure 2 ( a ) photo of heuweltjie 1.5 m above off-heuweltjie area ( b ) photo of exhumed heuweltjie calcrete plate ( c ) Photomicrograph (plane polarised light) of sample H5 showing relatively high content of detrital grains. ( d ) Photomicrograph (plane polarised light) of sample H4 showing
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Major element oxides, LOI and Sr versus SiO2 for heuweltjie and off-mound soil samples.

Major element oxides, LOI and Sr versus SiO 2 for heuweltjie and off-mound... Available to Purchase

Published: 01 December 2012
Figure 3 Major element oxides, LOI and Sr versus SiO 2 for heuweltjie and off-mound soil samples.
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Chondrite-normalised rare earth diagram for heuweltjie samples from Clanwilliam, Worcester, and bed rock from Clanwilliam (CW rock).

Chondrite-normalised rare earth diagram for heuweltjie samples from Clanwil... Available to Purchase

Published: 01 December 2012
Figure 5 Chondrite-normalised rare earth diagram for heuweltjie samples from Clanwilliam, Worcester, and bed rock from Clanwilliam (CW rock).
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Selected major element oxides versus Sr and selected incompatible tracelements versus Zr for heuweltjie samples. Symbols as for Figure 2. The off-mound soils were not analysed for trace elements.

Selected major element oxides versus Sr and selected incompatible traceleme... Available to Purchase

Published: 01 December 2012
Figure 4 Selected major element oxides versus Sr and selected incompatible tracelements versus Zr for heuweltjie samples. Symbols as for Figure 2 . The off-mound soils were not analysed for trace elements.
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Chondrite-normalized REE profiles for KK1 core samples; chondrite values from-Sun and McDonough (1989). Profiles for calcretes associated with Western Cape heuweltjies are shown in red (Midgley et al 2013).

Chondrite-normalized REE profiles for KK1 core samples; chondrite values fr... Available to Purchase

Published: 01 March 2016
Figure 7. Chondrite-normalized REE profiles for KK1 core samples; chondrite values from-Sun and McDonough (1989). Profiles for calcretes associated with Western Cape heuweltjies are shown in red (Midgley et al 2013).
Journal Article

Chemical stratigraphy of lake deposits from the Kalkkop Impact Crater, South Africa, and its palaeoenvironmental significance Available to Purchase

P. Mthembi, D.L. Roberts†, C. Harris
Published: 01 March 2016
South African Journal of Geology (2016) 119 (1): 215–230.
DOI: https://doi.org/10.2113/gssajg.119.1.215
...Figure 7. Chondrite-normalized REE profiles for KK1 core samples; chondrite values from-Sun and McDonough (1989). Profiles for calcretes associated with Western Cape heuweltjies are shown in red (Midgley et al 2013). ...
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View PDF for article title, Chemical stratigraphy of lake deposits from the Kalkkop Impact Crater, South Africa, and its palaeoenvironmental significance
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Journal Article

DEDICATION OF THE JOHN MOORE MEMORIAL VOLUME: SOUTH AFRICAN JOURNAL OF GEOLOGY Available to Purchase

Steve Prevec, Chris Harris
Published: 01 December 2012
South African Journal of Geology (2012) 115 (4): 415–416.
DOI: https://doi.org/10.2113/gssajg.115.4.415
... of basaltic glacial pavements near Kimberley with loading of glacial erratic boulders thereupon. Jeremy Midgley, Chris Harris, Amy Harington and Alastair Potts have provided Sr and C isotopic and major element geochemical evidence relating to the development of calcretes and heuweltjies (!) in the south...
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Journal Article

Synapsid Burrows and Associated Trace Fossils in the Lower Jurassic Navajo Sandstone, Southeastern Utah, U.S.A., Indicates a Diverse Community Living in a Wet Desert Ecosystem Available to Purchase

David J. Riese, Stephen T. Hasiotis, Georges P. Odier
Published: 01 April 2011
Journal of Sedimentary Research (2011) 81 (4): 299–325.
DOI: https://doi.org/10.2110/jsr.2011.25
.... , and Lancaster , N. , 2004b , Tropical westerlies over Pangaean sand seas : Sedimentology , v. 51 , p. 315 – 322 . Louw , G.N. , and Seely , M.K. , 1982 . Ecology of Desert Organisms : New York , Longman , 194 p. Lovegrove , B.G. , 1991 , Mima-like mounds (heuweltjies...
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View PDF for article title, Synapsid Burrows and Associated Trace Fossils in the Lower Jurassic Navajo Sandstone, Southeastern Utah, U.S.A., Indicates a Diverse Community Living in a Wet Desert Ecosystem
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Journal Article

Cenozoic stratigraphy of South Africa: current challenges and future possibilities Available to Purchase

G.A. Botha
Published: 01 December 2021
South African Journal of Geology (2021) 124 (4): 817–842.
DOI: https://doi.org/10.25131/sajg.124.0054
... soils on “heuweltjie” mounds confirms the long and complex geomorphic history of these hillslope deposits which may correlate with the Masotcheni Formation or “Fouresia Colluvium” in the Free State mountains. Colluvial sheetwash cover deposits also occur in a different terrain morphological context...
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