Provenance and tectonic setting of Late Proterozoic Buem sandstones of southeastern Ghana: Evidence from geochemistry and detrital modes

Osae, S.; Asiedu, Daniel K.; Banoeng-Yakubo, Bruce; Koeberl, Christian; Dampare, Samuel B.

doi:10.1016/j.jafrearsci.2005.11.009

Cited by 89 publications

(50 citation statements)

References 26 publications

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“…The high proportion of quartz and the dominance of K-feldspar over the more chemically unstable plagioclase in the Hawkesbury Sandstone Formation suggests that the source was exposed to prolonged weathering and that the sediment is at least partially multicyclic (Osae et al, 2006). This mineralogy is consistent with derivation from H a w k esb u r y S a n d ston e H a w k esb u r y S a n d ston e Hawk esbur y Sa ndstone Nesbitt and Young, 1984).…”

Section: Provenancesupporting

confidence: 71%

Provenance, diagenesis, tectonic setting, and geochemistry of Hawkesbury Sandstone (Middle Triassic), southern Sydney Basin, Australia

Zaid¹,

Gahtani²

2015

Turkish J Earth Sci

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The Hawkesbury Sandstone is an important groundwater reservoir in the southern part of the Sydney Basin, Australia. However, its diagenesis and provenance and its impact in reservoir quality are virtually unknown. The present study aims to reconstruct the parent rock assemblages of the Hawkesbury Sandstone, their tectonic provenance, and the physiographic conditions under which these sediments were deposited. Samples from the EAW 18a and EDEN 115 field representing the Middle Triassic Hawkesbury Sandstone were studied using a combination of petrographic, mineralogical, and geochemical techniques. The Hawkesbury Sandstone is yellowish brown in color, siliceous, and partly calcareous; it originated as sands were deposited in fluvial channels. Texturally, Hawkesbury Sandstone is medium-to coarse-grained, mature, and moderately well sorted. Scarcity of feldspars indicates that the rock is extensively recycled from a distant source. Hawkesbury Sandstone has an average framework composition of Q 92.07 F 0.31 R 7.62 , and 95.9% of the quartz grains are monocrystalline. The Hawkesbury Sandstone is mostly quartz arenites with subordinate sublithic arenites, and bulk-rock geochemistry supports the petrographic results. Petrographic and geochemical data of the sandstones indicate that they were derived from craton interior to quartzose recycled sedimentary rocks and deposited in a passive continental margin of a syn-rift basin. The cratonic Lachlan Orogen is the main source of Hawkesbury Sandstone. The chemical index of alteration, plagioclase index of alteration, and chemical index of weathering values (3.41-87.03) of the Hawkesbury Sandstone indicate low-moderate to high weathering, either of the original source or during transport before deposition, and may reflect low-relief and humid climatic conditions in the source area. Diagenetic features include compaction: kaolinite, silica, mixed-layer clays, siderite, illite, and ankerite cementation with minor iron-oxide, dolomite, chlorite, and calcite cements. Silica dissolution, grain replacement, and carbonate dissolution greatly enhance the petrophysical properties of many sandstone samples.

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Section: Provenancesupporting

confidence: 71%

Provenance, diagenesis, tectonic setting, and geochemistry of Hawkesbury Sandstone (Middle Triassic), southern Sydney Basin, Australia

Zaid¹,

Gahtani²

2015

Turkish J Earth Sci

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“…Three stages of grinding were involved in the preparation of the slides and extreme caution was taken to examine the slides between each stage of grinding to check for uniform reduction of the interference colors. The prepared slides were then labelled, and examined with the aid of transmitted light under the flat stage of the petrographic microscope using point count method according to Ingersoll et al (1984) and Osae et al (2006). Photomicrographs were taken and features of the mineral grains were observed based on the optical properties of the minerals.…”

Section: Thin-section Petrographymentioning

confidence: 99%

“…Negative correlation is shown by SiO 2 due to most of the silica being sequestered in quartz as indicated by Osman (1996) (Figure 13). The relatively high values of K 2 O/Na 2 O average ratios (Table 5) is attributed to the presence of albitic plagioclase, K-feldspar, mica and illite (Pettijonh et al, 1963;McLennan et al, 1983;Nath et al, 2000;Osae et al, 2006). Compared to other major elements, the concentration of Fe 2 O 3 and TiO 2 indicates the probably presence of iron-titanium minerals (haematite and anatase rutiles) (Pearse et al, 1999).…”

Section: Major Element Geochemistrymentioning

confidence: 99%

“…The most widely used indices for quantitative estimation of the degree of chemical weathering undergone by the rocks of the provenance area of clastic sediments, include; the Chemical Index of Alteration (CIA) proposed by Nesbitt and Young (1982), and Plagioclase index of Alteration (PIA) by (Fedo et al, 1995). indicate intensive weathering in the source area whereas low values (≤ 60) indicate low weathering in the source area (Osae et al, 2006). Other indices also used are the Chemical Index of Weathering (CIW) (Harnois, 1988).…”

Section: Source Area Weatheringmentioning

confidence: 99%

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Provenance Studies of Sandstone Facies Exposed Near Igbile Southwestern Nigeria: Petrographic and Geochemical Approach

Ikhane¹,

Akintola²,

Bankole³

et al. 2014

JGG

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The petrography, as well as the major, trace and rare earth element compositions of ten (10) sandstone samples of Maastrichtian Afowo Formation exposed near Igbile, Southwestern Nigeria, have been investigated to determine their provenance, source area weathering conditions, paleoclimate and tectonic setting using petrographic analysis and Inductively Coupled Plasma -Mass Spectrometry (ICP-MS).Results of the petrographic analysis revealed that quartz is the most dominant detrital mineral with (86%) followed by weathered plagioclase feldspar (5.10%) and rock fragments (10.9%). The quartz grain is sub-angular to sub-rounded in shape and the sandstones were classified as quartz arenites, sublitharenites and subarkoses based on framework composition of quartz, feldspar and rock fragment plots. This suggests a recycled orogen source for the sandstones and deposition in a humid climate, evidenced by the weathered feldspars. Eleven (11) major, seventeen (17) trace and fourteen (14) rare earth elements were obtained from the geochemical analysis. The major elements values range in concentration from 0.01%-81.39% with SiO 2 being the dominant oxide followed by Al 2 O 3 and Fe 2 O 3 constituting over 95% of the major oxides; K 2 O, TiO 2 , Na 2 O, CaO, MgO and P 2 O 5 made up the remaining 5%. The average ratio of SiO 2 /Al 2 O 3 valued 4.31 for the sandstone is appreciably high indicating that it has been heavily weathered. The trace elements range in concentration from 0.2 ppm-1651.2 ppm with Zr being the most dominant element an indication of orogenic recycling. The rare earth elements range in concentration from 0.01 ppm-163.7 ppm with Ce having the highest concentration, depicting that the sandstones were deposited in an oxidizing environment. Also, the trace element relationship illustrated from the spider plot shows chemical coherence and uniformity of the sandstones. The chondrite normalized rare earth elements (REE) plot shows enrichment in the Light REE over the heavy REE for the sediment with strong negative Eu anomaly values between (0.57-0.69) suggesting a felsic provenance derived from upper continental crust for the sandstones.

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“…The high K 2 O/Na 2 O ratios are attributed to the common presence of K-bearing minerals such as K-feldspar and mica, illite, muscovite, and biotite [29,30,31,32]. A positive correlation between K 2 O and Al 2 O 3 implies that the concentrations of the K-bearing minerals have significant influence on Al distribution and suggests that the abundance of these elements is primarily controlled by the content of clay minerals [29] .…”

Section: Sandstone Classificationmentioning

confidence: 99%

Geochemistry of Sandstones from the Aghajari Formation, Folded Zagros Zone, Southwestern Iran: Implication for Paleoweathering condition, Provenance, and Tectonic Setting

Sahraeyan

Bahrami

2012

International Journal of Basic and Applied Sciences

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The Late Miocene-Pliocene Aghajari Formation is exposed throughout the Folded Zagros Zone and consists of fluvial sediments. Aghajari Formation sandstones are characterized by low to moderate SiO 2 contents, variable abundances of major elements and a relatively high proportion of ferromagnesian elements. Evidence from discrimination diagrams of sedimentary provenance, tectonic setting, major element geochemistry, and Sc/Th, Cr/Th, Co/Th, Zr/ Sc, La/Sc, La/Co, Cr/Sc, and Y/Ni values show that the Aghajri Formation sediments were derived from felsic and intermediate sources. The chemical index of alteration (CIA: 59.2-77.14) revealed low to moderately weathered source rocks. The major and trace element concentrations indicate deposition in an active continental margin and passive continental margin settings.

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Provenance and tectonic setting of Late Proterozoic Buem sandstones of southeastern Ghana: Evidence from geochemistry and detrital modes

Cited by 89 publications

References 26 publications

Provenance, diagenesis, tectonic setting, and geochemistry of Hawkesbury Sandstone (Middle Triassic), southern Sydney Basin, Australia

Provenance, diagenesis, tectonic setting, and geochemistry of Hawkesbury Sandstone (Middle Triassic), southern Sydney Basin, Australia

Provenance Studies of Sandstone Facies Exposed Near Igbile Southwestern Nigeria: Petrographic and Geochemical Approach

Geochemistry of Sandstones from the Aghajari Formation, Folded Zagros Zone, Southwestern Iran: Implication for Paleoweathering condition, Provenance, and Tectonic Setting

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