Crustal growth during island arc accretion and transcurrent deformation, Natal Metamorphic Province, South Africa: New isotopic constraints

Spencer, Christopher J.; Thomas, Robert J.; Cawood, Peter A.; Millar, Ian L.; Tapster, Simon

doi:10.1016/j.precamres.2015.05.011

Cited by 38 publications

(8 citation statements)

References 48 publications

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“…Eglington et al 1989;Thomas & Eglington 1990). The superchondritic ε Hf -signatures of the granites reported in this study, also found in the data of Spencer et al (2015), add supporting evidence to the juvenile nature of the Natal Sector. The Namaqua Sector is therefore an unlikely source area for the generally juvenile, late Mesoproterozoic to earliest Neoproterozoic zircons found in the Natal Group (Fig.…”

Section: Potential Source Areassupporting

confidence: 87%

“…Sm-Nd work has shown that, while the Natal Sector has a juvenile nature (Eglington et al 1989;Thomas & Eglington 1990), the Namaqua Sector has a more prolonged crustal history (Yuhara et al 2001;Pettersson et al 2009). The juvenile nature of the Natal sector is also supported by Hf data (Spencer et al 2015). The southern two-thirds of the Natal Sector are dominated by granitoid rocks which make up >80% of the exposed area (Eglington et al 2003).…”

Section: Geological Settingmentioning

confidence: 92%

“…4). This data, combined with the Hf data of Spencer et al (2015) provides an extensive Hf signature of the zircon-fertile lithologies in the region.…”

Section: Materials Studiedmentioning

confidence: 97%

“…2D KDEs were calculated over an equally spaced 100x100 grid spanning from 2800 to 3800 in the x-direction and -5 to 5 in the y-direction using fixed bandwidths of 30 and 1.5 in the x-and y-directions, respectively. Histogram of individual zircon initial ε Hf (this study; Spencer et al 2015) and whole rock ε Nd from basement rocks in the Natal Province. Black: 2ε Nd + 2; diagonal lines: ε Hf data from Spencer et al (2015); grey: ε Hf data this study.…”

Section: Figmentioning

confidence: 99%

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Detrital zircon in a supercontinental setting: locally derived and far-transported components in the Ordovician Natal Group, South Africa

Kristoffersen

Andersen

Elburg

et al. 2015

JGS

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U-Pb and Lu-Hf signatures of detrital zircon from conglomerates and sandstones of the Ordovician Natal Group, South Africa were determined using LA-ICPMS. The basal conglomerates are dominated by Palaeo-to Mesoarchaean detrital zircon with ε Hf-values from +3 to-4 with minor Mesoproterozoic input, indicating a proximal source in the Kaapvaal Craton and minor input from rocks of the Natal Sector of the Mesoproterozoic Namaqua-Natal province. The sandstones are all dominated by a combination of juvenile Mesoproterozoic zircon and Neoproterozoic zircon derived from Mesoproterozoic rocks that were reworked during the Pan-African Orogeny. Several sedimentary sequences from former Gondwana with Neoproterozoic to Permian depositional ages show similar detrital zircon signatures. Sedimentary sequences of such vast temporal and geographical distribution are unlikely to have been fed by a single source, making it more likely that these sequences were fed by several different (Pan-Gondwana) source terranes with closely similar U-Pb and Lu-Hf zircon signatures. The results show that source terrane non-uniqueness can make ascertaining sedimentary provenance from detrital zircon impossible, and should be taken as a reminder when using detrital zircon as evidence for far reaching conclusions in basin evolution studies and palaeogeography.

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Section: Potential Source Areassupporting

confidence: 87%

Section: Geological Settingmentioning

confidence: 92%

“…4). This data, combined with the Hf data of Spencer et al (2015) provides an extensive Hf signature of the zircon-fertile lithologies in the region.…”

Section: Materials Studiedmentioning

confidence: 97%

Section: Figmentioning

confidence: 99%

See 2 more Smart Citations

Detrital zircon in a supercontinental setting: locally derived and far-transported components in the Ordovician Natal Group, South Africa

Kristoffersen

Andersen

Elburg

et al. 2015

JGS

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“…Further north‐east, the basement is formed by 3.1 Ga granitoids of the Mpuluzi suite (Kröner et al , ). In the southern part of the study area, the Natal Suture Zone (Figure B) dated to 1.20–1.08 Ga is characterized by an array of major east‐west striking thrust faults that formed during the accretion of terranes to the Kaapvaal Craton (Spencer et al , ). Mainly south and east of the Natal Suture Zone, Siluro‐Ordovician clastic sedimentary rocks of the Natal Group cover the older basement and underlie the Dwyka Group (Marshall, ).…”

Section: Geological Settingmentioning

confidence: 99%

Ice‐margin fluctuation sequences and grounding zone wedges: The record of the Late Palaeozoic Ice Age in the eastern Karoo Basin (Dwyka Group, South Africa)

Dietrich

Hofmann

2019

The Depositional Record

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In the eastern part of the Karoo Basin of South Africa, the sedimentary record of the Late Palaeozoic Ice Age, the Dwyka Group, consists of an up to 200 m thick accumulation of massive to crudely stratified diamictite occasionally interstratified with siltstone, sandstone and conglomerate horizons. Three distinct sedimentary units, separated by intervening glacial erosion surfaces, are viewed as ice‐margin fluctuation sequences. The lowermost one, resting on highly uneven, glacially abraded Archaean basement, has been interpreted as a grounding zone wedge deposited after the retreat and stabilization of the ice margin after the inundation of the Karoo Basin. The grounding zone wedge interpretation is based on its thickness (up to 100 m), the dominance of diamictite, and its facies assemblage and inferred depositional processes (rain‐out of debris, dropstone dumping, mass and debris flow, till). Overlying the grounding zone wedge, deposits are sedimentary units interpreted as glaciofluvial or ice‐contact delta and grounding zone wedges, respectively. By analogy with Quaternary sedimentary sequences, deposition of the Dwyka Group in the study area might have been very rapid (tens to hundreds of thousand years) and may hence correlate with the ultimate deglacial sequence of the Western Karoo Basin, as both successions are covered by the postglacial Ecca Group. Although commonly observed and imaged on modern, high‐latitude continental shelves, grounding zone wedges have never been interpreted in the ancient geological record. This paper therefore outlines a model defining criteria necessary for their identification.

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The Kalahari Craton, Southern Africa: From Archean Crustal Evolution to Gondwana Amalgamation

Oriolo

Becker

2018

Regional Geology Reviews

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Crustal growth during island arc accretion and transcurrent deformation, Natal Metamorphic Province, South Africa: New isotopic constraints

Cited by 38 publications

References 48 publications

Detrital zircon in a supercontinental setting: locally derived and far-transported components in the Ordovician Natal Group, South Africa

Detrital zircon in a supercontinental setting: locally derived and far-transported components in the Ordovician Natal Group, South Africa

Ice‐margin fluctuation sequences and grounding zone wedges: The record of the Late Palaeozoic Ice Age in the eastern Karoo Basin (Dwyka Group, South Africa)

The Kalahari Craton, Southern Africa: From Archean Crustal Evolution to Gondwana Amalgamation

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