Archean Accretion and Crustal Evolution of the Kalahari Craton—the Zircon Age and Hf Isotope Record of Granitic Rocks from Barberton/Swaziland to the Francistown Arc

Zeh, Armin; Gerdes, Axel; Barton, J. M.

doi:10.1093/petrology/egp027

Cited by 298 publications

(108 citation statements)

References 129 publications

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“…The Devonian granite clast is, within error, the same age as a granite (371 ± 4 Ma) from the southwestern part of the North Patagonia Massif (Pankhurst et al 2006). The Archaean granite has an age (3161 ± 13 Ma) and Hf isotope composition that matches closely with the Kaapvaal Craton of South Africa (Zeh, Gerdes & Barton, 2009).…”

Section: Interpretation Of the Geochronology And Hf Isotope Geochemistrymentioning

confidence: 54%

Permo-Carboniferous conglomerates in the Trinity Peninsula Group at View Point, Antarctic Peninsula: sedimentology, geochronology and isotope evidence for provenance and tectonic setting in Gondwana

et al. 2011

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-Field observations from the Trinity Peninsula Group at View Point on the Antarctic Peninsula indicate that thick, southward-younging and overturned clastic sedimentary rocks, comprising unusually coarse conglomeratic lenses within a succession of fine-grained sandstonemudstone couplets, are the deposits of debris and turbidity flows on or at the foot of a submarine slope. Three detrital zircons from the sandstone-mudstone couplets date deposition at 302 ± 3 Ma, at or shortly after the Carboniferous-Permian boundary. Conglomerates predominantly consist of quartzite and granite and contain boulders exceeding 500 mm in diameter. Zircons from granitoid clasts and a silicic volcanic clast yield U-Pb ages of 466 ± 3 Ma, 373 ± 5 Ma and 487 ± 4 Ma, respectively and have corresponding average εHf t values between +0.3 and +7.6. A quartzite clast, conglomerate matrix and sandstone interbedded with the conglomerate units have broadly similar detrital zircon age distributions and Hf isotope compositions. The clast and detrital zircon ages match well with sources within Patagonia; however, the age of one granite clast and the εHf characteristics of some detrital zircons point to a lesser South Africa or Ellsworth Mountain-like contribution, and the quartzite and granite-dominated composition of the conglomerates is similar to upper Palaeozoic diamictites in the Ellsworth Mountains. Unlike detrital zircons, large conglomerate clasts limit possible transport distance, and suggest sedimentation took place on or near the edge of continental crust. Comparison with other upper Palaeozoic to Mesozoic sediments in the Antarctic Peninsula and Patagonia, including detrital zircon composition and the style of deformation, suggests deposition of the Trinity Peninsula Group in an upper plate basin on an active margin, rather than a subduction-related accretionary setting, with slow extension and rifting punctuated by short periods of compression.

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Section: Interpretation Of the Geochronology And Hf Isotope Geochemistrymentioning

confidence: 54%

Permo-Carboniferous conglomerates in the Trinity Peninsula Group at View Point, Antarctic Peninsula: sedimentology, geochronology and isotope evidence for provenance and tectonic setting in Gondwana

et al. 2011

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“…In the 176 Hf-177 Hf int versus apparent Pb-Pb age (Figure 4) diagram, similar 176 Hf- 177 Hf ratio suggested that the studied zircon ages could have been reset during subsequent geological events. However, magmatic and metamorphic zircon domains maintained their primary hafnium isotopic signatures even during high-grade polymetamorphic conditions 16,19 . The horizontal arrays of the 176 Hf-177 Hf isotope data can be interpreted to result from post crystallization metamorphic alteration, which caused single or multiple Pb-loss events but did not change the primary 176 Hf (see refs 16, 19).…”

Section: Discussionmentioning

confidence: 99%

“…Zircon Hf model ages can be used with confidence for determining ages of crust formation when only supported by other lines of evidence, e.g. matching UPb zircon age populations 19 . So, we do not emphasize much on our limited zircon Hf model age dataset.…”

Section: Dm Hfmentioning

confidence: 99%

“…In polycyclic Archaean metamorphic assemblages, zircon grains may have grown during different geological processes and/or may have been affected by multiple alteration processes 16,17 . Combined U-Pb and Lu-Hf zircon datasets can provide new insights on the timing of primary and secondary events such as juvenile versus crustal remelting, magma sources or metamorphism 18,19 . The isotope data can also provide tight constraints on the timing of crustal growth and reworking 16 .…”

mentioning

confidence: 99%

“…affected by multiple Pb-loss that caused the resetting of the UPb system, but left the zircon Hf isotope system unaffected (see Zeh et al) 19 . A positive correlation was seen between apparent zircon PbPb ages and Hf(t) ( Figure 5).…”

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confidence: 99%

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U–Pb and Lu–Hf Systematics of Zircons from Sargur Metasediments, Dharwar Craton, Southern India:New Insights on the Provenance and Crustal Evolution

et al. 2017

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A study of U-Pb and Lu-Hf-Yb isotope data in zircons from metamorphosed psammopelite and quartzite from the type area of Archaean Sargur Group, Dharwar Craton, India is carried out. Two age populations are observed: an older population with concordant U-Pb ages between 2.7 and 2.8 Ga, and a younger population with ages in the 2.4-2.6 Ga age range. The Hf values of 0 to +2.0 for the older zircon population suggest that they were derived from juvenile crust formed at 2.7-2.8 Ga. Sub-chondritic Hf values for the younger population indicate metamorphism and/or crustal reworking at ~2.5 Ga. Metasedimentary enclaves in the Sargur type area are therefore part of the gneiss-supracrustal complex of different antiquities and may not have an independent stratigraphic status.

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Neoarchaean subduction tectonics in Western Shandong Province, China: Evidence from geochemistry and zircon U–Pb–Hf isotopes of metabasalts

et al. 2019

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Neoarchaean supracrustal rocks, which were discovered in the Longhuzhai and Menglianggu areas of the Western Shandong Province (WSP) in the Eastern Block of the North China Craton (NCC), are fine-to medium-grained amphibolites that commonly underwent greenschist-to amphibolite-facies metamorphism. LA-ICP-MS zircon U-Pb analyses revealed that these metabasalts erupted at 2,527 ± 5 to 2,514 ± 4 Ma. These supracrustal rocks are tholeiitic basalts in chemical composition and exhibit relatively high SiO 2 (49.30-53.34 wt%) and MgO (5.24-11.82 wt%) contents but low TiO 2 (0.41-0.75 wt%) contents. They display flat chondrite-normalized rare earth element (REE) patterns ((La/Yb) N = 1.21-2.60) and negative Nb, Ta, and Ti anomalies ((Nb/La) PM = 0.16-0.54), which are similar to those of typical island arc tholeiites (IATs) in subduction-related settings. These findings, combined with the positive zircon εHf(t) values (+2.51 to +8.90) and εNd(t) values (+0.19 to +3.65), suggest that these metabasalts were derived from the partial melting of a depleted mantle source that was metasomatized by slab-derived fluids at shallow levels in the upper mantle. Accordingly, the development of arc-related tholeiitic volcanic rocks within the interior of the WSP imply that the Neoarchaean (2.6-2.5 Ga) subduction-related slab-wedge interaction mechanism was widespread in the WSP and played a crucial role in the formation of the continental crust and its growth.

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Archean Accretion and Crustal Evolution of the Kalahari Craton—the Zircon Age and Hf Isotope Record of Granitic Rocks from Barberton/Swaziland to the Francistown Arc

Cited by 298 publications

References 129 publications

Permo-Carboniferous conglomerates in the Trinity Peninsula Group at View Point, Antarctic Peninsula: sedimentology, geochronology and isotope evidence for provenance and tectonic setting in Gondwana

Permo-Carboniferous conglomerates in the Trinity Peninsula Group at View Point, Antarctic Peninsula: sedimentology, geochronology and isotope evidence for provenance and tectonic setting in Gondwana

U–Pb and Lu–Hf Systematics of Zircons from Sargur Metasediments, Dharwar Craton, Southern India:New Insights on the Provenance and Crustal Evolution

Neoarchaean subduction tectonics in Western Shandong Province, China: Evidence from geochemistry and zircon U–Pb–Hf isotopes of metabasalts

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