In situ determination of U–Pb ages and Sr–Nd–Hf isotopic constraints on the petrogenesis of the Phalaborwa carbonatite Complex, South Africa

Wu, Fu‐Yuan; Yang, Yue‐Heng; Li, Qiuli; Mitchell, Roger H.; Dawson, J. B.; Brandl, G.; Yoshio, Masaki

doi:10.1016/j.lithos.2011.09.005

Cited by 103 publications

(45 citation statements)

References 87 publications

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“…These geochemical features suggest that they may be derived from the subduction zone (McCulloch & Gamble, ). The ( 87 Sr/ 86 Sr) i ratios of the Xishuiquan granites are slightly lower than the normal range (Table ), which may be caused by hydrothermal activity (Wu, Sun et al, ; Wu, Yang et al, ). However, their ε Nd ( t ) values are similar to those for the quartz diorites (Figure a).…”

Section: Discussionmentioning

confidence: 93%

“…The northern margin of the North China Craton (NCC), which is located in the eastern Central Asian Orogenic Belt, is a major Phanerozoic orogenic belt (Figure ). Controlled by the evolution of the Paleo‐Asian Ocean and the Pacific tectonic domain, the northern margin of the NCC experienced a complex tectonic evolution during the Palaeozoic and Mesozoic (Li, ; Li, Zhang, Yang, et al, ; Ren et al ., 1999; Wang & Liu, ; Wu & Cao, ; Wu, Sun et al, , Wu, Yang et al, ; Xiao, Windley, Hao, & Zhai, , 2015; Xu, Pei, Wang, et al, ; Zhang, Wu et al, ; Zhang, Zhao et al, ).…”

Section: Introductionmentioning

confidence: 99%

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Geochronology, geochemistry, and tectonic significance of Permian intrusive rocks from the Shaolanghe region, northern margin of the North China Craton

et al. 2017

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In situ zircon U–Pb ages and Hf isotopic data, whole‐rock major and trace element contents, and Sr–Nd isotopic compositions are reported for Permian intrusive rocks at Shaolanghe in Eastern Inner Mongolia in order to explore the magmatic origin and tectonic significance of these rocks for the evolution of the northern margin of the North China Craton. Three intrusive rocks, quartz diorite, Xishuiquan granite, and Xinglong granite, yield zircon U–Pb ages of 285.9 ± 3.1, 274.2 ± 2.9, and 260.0 ± 8.4 Ma, respectively. The quartz diorite and Xishuiquan granite belong to the high‐K calc‐alkaline series, enriched in large ion lithophile elements (e.g., Rb) and depleted in high field strength elements (e.g., Nb and Ti). They are defined as I‐type granites. The quartz diorite has initial 87Sr/86Sr ratios of 0.7049–0.7051, εNd(t) values of −10.0 to −11.4, and εHf(t) values of −15.2 to −9.9. The εHf(t) values of the Xishuiquan granite (−4.8 to 4.0) vary in discrete segments, whereas the εNd(t) values (−12.9 to −13.3) are consistent with those of the quartz diorites (−10.0 to −11.4). A magma mixing model is proposed for the formation of the quartz diorites of the Shaolanghe region, and the Xishuiquan granite was likely derived from partial melting of the Paleoproterozoic crust with involvement of mantle components. Geochemical analyses show that the tectonic setting of the northern margin of the North China Craton during the late Palaeozoic was an Andes‐type active continental margin associated with subduction of the Paleo‐Asian Ocean plate.

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Section: Discussionmentioning

confidence: 93%

Section: Introductionmentioning

confidence: 99%

Geochronology, geochemistry, and tectonic significance of Permian intrusive rocks from the Shaolanghe region, northern margin of the North China Craton

et al. 2017

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“…1). The primary magma of the Phalaborwa Complex had an initial 87 Sr/ 86 Sr ratio of 0.7041-0.7107, and an εNd of −3.4 to −7.5 (Wu et al 2011). These authors interpreted these data to indicate derivation by partial melting of metasomatised enriched lithospheric mantle, and thus a suitable mantle source to explain the Sr and Nd isotope composition of the RLS magmas existed.…”

Section: Comparison With the Bushveld Complexmentioning

confidence: 98%

The oxygen isotope composition of Karoo and Etendeka picrites: High δ18O mantle or crustal contamination?

Harris

Roux

Cochrane

et al. 2015

Contrib Mineral Petrol

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Explanations for the high δ 18 O values in Tuli/Mwenezi picrites are limited to (1) alteration, (2) crustal contamination, and (3) derivation from mantle with an abnormally high δ 18 O. Previously, a variety of models that range from crustal contamination to derivation from the 'enriched' mantle lithosphere have been suggested to explain high concentrations of incompatible elements such as K, and average εNd and εSr values of −8 and +16 in Mwenezi (Nuanetsi) picrites. However, the primitive character of the magmas (Mg# 73), combined with the lack of correlation between δ 18 O values and radiogenic isotopic compositions, MgO content, or Mg# is inconsistent with crustal contamination. Thus, an 18 O-enriched mantle source having high incompatible trace element concentration and enriched radiogenic isotope composition is indicated. High δ 18 O values are accompanied by negative Nb and Ta anomalies, consistent with the involvement of the mantle lithosphere, whereas the high δ 18 O themselves are consistent with an eclogitic source. Magma δ 18 O values about 1 ‰ higher than expected for mantle-derived magma are also a feature of the Bushveld mafic and ultramafic magmas, and the possibility exists that a long-lived 18 O-enriched mantle source has existed beneath southern Africa. A mixed eclogite peridotite source could have developed by emplacement of oceanic lithosphere into the cratonic keel during Archaean subduction.

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“…Our oldest (U‐Th)/He dates are for the baddeleyite, which record cooling following Phalaborwa emplacement at 2.06 Ga, as constrained by previous geochronologic data (Eriksson, ; Heaman, ; Heaman & LeCheminant, ; Reischmann, ; Wu et al, ). The oldest titanite date is ∼1.1 Ga.…”

Section: Discussionmentioning

confidence: 86%

“…We could find no published information regarding the probable emplacement depth or exposure level of the complex. Phalaborwa's age of 2.06 Ga is constrained by baddeleyite, zircon, uranothorianite, and thorianite U-Pb dates (Eriksson, 1984;Heaman & LeCheminant, 1993;Heaman, 2009;Reischmann, 1995;Wu et al, 2011). Phalaborwa baddeleyite is used as a U-Pb standard due to its abundance, reproducibility, and concordance, and yields a precise 207 Pb/ 206 Pb date of 2059.60 6 0.35 Ma (Heaman, 2009).…”

Section: Geologic Setting and Phalaborwa Carbonatite Complexmentioning

confidence: 99%

Deciphering a 2 Gyr‐Long Thermal History From a Multichronometer (U‐Th)/He Study of the Phalaborwa Carbonatite, Kaapvaal Craton, South Africa

Baughman

Flowers

2018

Geochem Geophys Geosyst

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(U‐Th)/He data were obtained for four minerals (baddeleyite‐BHe, titanite‐THe, zircon‐ZHe, apatite‐AHe) from the 2.06 Ga Phalaborwa carbonatite complex and nearby Archean basement of the Kaapvaal craton, South Africa. Our goals are to evaluate the relative He temperature sensitivities of these phases, better understand how radiation damage and other factors affect them, and inform aspects of the craton's thermal history. BHe dates overlap with Phalaborwa emplacement and record the highest temperatures of the dated phases. THe dates are 700–1,100 Ma and display a limited negative date‐eU correlation. ZHe dates are negatively correlated with eU, are younger (561–32 Ma) and have higher eU than the THe data, with the highest‐eU grains younger than the AHe dates. AHe dates are reproducible with a mean of 107 ± 7 Ma. The THe and ZHe data show radiation damage reduction of their He retentivities manifested as the negative date‐eU correlations. Alpha dose estimates for zircon are several orders of magnitude higher than for titanite, consistent with the ZHe dates recording lower temperatures and a younger portion of the history than the THe dates. Thermal history modeling yields time‐temperature paths that (1) explain the AHe, ZHe, and THe data while honoring existing geologic constraints, thus demonstrating the internal consistency of the data set, (2) imply possible reheating during Namaqua‐Natal orogenesis, and (3) limit maximum probable temperatures to ∼180°C during 300–183 Ma Karoo basin burial. The results show that exploiting multiple (U‐Th)/He thermochronometers and radiation damage effects can provide new insights into long‐term craton evolution.

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In situ determination of U–Pb ages and Sr–Nd–Hf isotopic constraints on the petrogenesis of the Phalaborwa carbonatite Complex, South Africa

Cited by 103 publications

References 87 publications

Geochronology, geochemistry, and tectonic significance of Permian intrusive rocks from the Shaolanghe region, northern margin of the North China Craton

Geochronology, geochemistry, and tectonic significance of Permian intrusive rocks from the Shaolanghe region, northern margin of the North China Craton

The oxygen isotope composition of Karoo and Etendeka picrites: High δ18O mantle or crustal contamination?

Deciphering a 2 Gyr‐Long Thermal History From a Multichronometer (U‐Th)/He Study of the Phalaborwa Carbonatite, Kaapvaal Craton, South Africa

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