Evolution of the depleted mantle: Hf isotope evidence from juvenile rocks through time

Vervoort, Jeff D.; Blichert‐Toft, Janne

doi:10.1016/s0016-7037(98)00274-9

Cited by 1,300 publications

(486 citation statements)

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“…Data points include single zircon eHf(T) and WR eNd(T) from this study and from the literature (Beyth et al 1994;Katzir et al 2007a;Moghazi et al 1998;Stein and Goldstein 1996) for the same rocks. Also shown are WR eNd(T)-eHf(T) fields for the *630 Ma Elat schistose dikes from southern Israel (Katz et al 2004) located in the NWregion and for rocks from southern Sudan (Vervoort and Blichert-Toft 1999) representing more southerly segments of the ANS. All single zircon eHf(T) ?…”

Section: Single Zircon Hf Isotope Resultsmentioning

confidence: 99%

“…All single zircon eHf(T) ? WR eNd(T) datapoints except one sample plot within the juvenile WR field of Vervoort and Blichert-Toft (1999). The NW-region rocks, excluding the Timna porphyritic granite, are located to the lower-left in Fig.…”

Section: Single Zircon Hf Isotope Resultsmentioning

confidence: 99%

“…Data points include single zircon eHf(T) from this study and WR eNd(T) from this study and the literature (Beyth et al 1994;Katzir et al 2007a;Moghazi et al 1998;Stein and Goldstein 1996) for the same rocks. Also shown are WR eNd(T)-eHf(T) fields for the *630 Ma Elat schistose dikes from southern Israel (Katz et al 2004) located in the NW-region and for rocks from southern Sudan (Vervoort and Blichert-Toft 1999) Isotope constraints on 635-570 Ma crustal evolution The late stages in the evolution of the ANS (post *650 Ma) were characterized by vast intrusion of mostly granitic batholiths and their associated volcanics (Bentor 1985). In the northernmost ANS this phase included the 635-570 Ma CA2 and AL suites, and their formation has been associated with the change in tectonic activity during this time from collision to post-collisional activity (Be'eriShlevin et al 2009a;Beyth et al 1994;Eyal et al 2009;Stern 1994;Stern et al 1984).…”

Section: Isotope Constraints On 820-740 Ma Crustal Evolutionmentioning

confidence: 99%

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Nd–Sr–Hf–O isotope provinciality in the northernmost Arabian–Nubian Shield: implications for crustal evolution

Be’eri-Shlevin

Katzir

Blichert‐Toft

et al. 2009

Contrib Mineral Petrol

101

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Multi-isotope study including whole-rock NdSr, single zircon Hf, and SIMS d 18 O analyses of zircons sheds light on magma sources in the northernmost Arabian-Nubian Shield (ANS) during *820-570 Ma. Reconnaissance initial Nd and Sr isotope data for the older rocks (*820-740 Ma) reaffirms previous estimates that early crustal evolution in this part of the shield involved some crustal contamination by pre-ANS material. Prominent isotope provinciality is displayed by post-collisional calc-alkaline and alkaline igneous rocks of *635-570 Ma across a NW-SE transect across basement of the Sinai Peninsula (Egypt) and southern Israel. Silicic rocks of the NW-region are characterized by lower eNd(T)-eHf(T) and higher Sr i and d 18 O compared with rocks of the SE-region, and the transition between the regions is gradual. Within each region isotope ratios are independent of the extent of magma fractionation, and zircon cores and rims yield similar d 18 O values. Comparison with southern segments of the ANS shows that the source for most *635-570 Ma rocks can be modeled as the isotopically aged lowerintermediate crust in the ANS core (SE-region) and its northern, more contaminated ANS margins (NW-region). Nevertheless, Nd-Sr isotope enrichment of the lithospheric mantle is indicated by some basic magmas of the NWregion displaying the most enriched Nd-Sr isotope compositions. Comparison of Nd and Hf depleted mantle model ages for rocks of the SE-region may indicate that crustal formation events in the ANS geographical core took place at 1.1-1.2 Ga and were followed by crustal differentiation starting at *0.9 Ga.

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Section: Single Zircon Hf Isotope Resultsmentioning

confidence: 99%

Section: Single Zircon Hf Isotope Resultsmentioning

confidence: 99%

Section: Isotope Constraints On 820-740 Ma Crustal Evolutionmentioning

confidence: 99%

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Nd–Sr–Hf–O isotope provinciality in the northernmost Arabian–Nubian Shield: implications for crustal evolution

Be’eri-Shlevin

Katzir

Blichert‐Toft

et al. 2009

Contrib Mineral Petrol

101

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“…The laser repetition rate is 10 Hz and the energy density applied is 15-20 J/cm -2 . Raw count rates for 172 Lu/ 177 Hf ratio of 0.0384 [27]. The two-stage model age (T DM2 ) was calculated by projecting the initial 176 Hf/ 177 Hf of zircon back to the depleted mantle growth curve using 176 Lu/ 177 Hf = 0.015 for the average continental crust [28].…”

Section: Methodsmentioning

confidence: 99%

Early Precambrian tectonothermal events of the North China Craton: Constraints from in situ detrital zircon U-Pb, Hf and O isotopic compositions in Tietonggou Formation

et al. 2013

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Clastic sediments and sedimentary rocks are widely used for understanding the formation and evolution of the continental crust. The Tietonggou Formation outcrops in the Xiaoqinling region at the southern margin of the North China Craton (NCC) and has unconformable contacts with the underlying Taihua Complex and overlying Paleoproterozoic Xiong'er Group. It mainly consists of quartzite and its protoliths are mature terrigenous clastic rocks. On the basis of the ages of the youngest detrital zircons from the quartzites and the ages of the Xiong'er Group, the depositional ages of the protoliths of the Tietonggou Formation were well constrained to 1.91-1.80 Ga. The U-Pb isotopic data of detrital zircons from the Formation show a major age peak at ~2.1 Ga, which is consistent with 2.2-2.0 Ga magmatism in the Trans-North China Orogen of the NCC. Taking into account the texctural and compositional maturity of the Tietonggou Formation quartzite, the ~2.1 Ga lithologic units in the Trans-North China Orogen are interpreted as the major source of the Tietonggou Formation. The majority of these ~2.1 Ga detrital zircons mostly have high δ 18 O values (>6.5‰) and negative ε Hf (t) values (-7.8-0.0), with corresponding Hf model ages significantly older than their crystallization ages, indicating that these zircons formed from the partial melting of ancient continental crust. The majority of the 2.8-2.7 Ga and ~2.5 Ga detrital zircons from the Tietonggou Formation had positive ε Hf (t) values, and mantle-like δ 18 O values, suggesting that the NCC has experienced two stages of significant crustal growth in the Neoarchaean at 2.7 and 2.5 Ga, respectively. The Hf isotopic data of detrital zircons from Paleoproterozoic metasedimentary rocks in the Trans-North China Orogen varied mainly toward the reduction of the radiogenic Hf isotope and gradually show a similar trend of the isotope trajectories of crustal evolution. This reveals that the NCC probably has not developed a long-lived subduction to complete the final assembly of the NCC. Alternatively, these maybe imply that the tectonic setting of the NCC substantially changed at ~2.1 Ga, the reduction of the radiogenic Hf isotope could be attributed to the rollback of the subducting slab. North China Craton, Tietonggou Formation, detrital zircon, Hf isotope, O isotope Citation:Diwu C R, Sun Y, Gao J F, et al. Early Precambrian tectonothermal events of the North China Craton: Constraints from in situ detrital zircon

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“… Hf (t) values are based on a decay constant of 176 Lu ( 176 Lu= 1.865±0.015×10 11 a 1 ) as recommended by Scherer et al [31], and on the chondritic isotopic ratios ( 176 Hf/ 177 Hf= 0.282772, 176 Lu/ 177 Hf=0.0332) suggested by Blichert-Toft and Albarède [32]. The isotopic ratios of Vervoort and Blichert-Toft [33] for the depleted mantle ( 176 Hf/ 177 Hf= 0.28325, 176 Lu/ 177 Hf=0.0384) were used for depleted mantle model age calculation.…”

Section: Analytical Techniquesmentioning

confidence: 99%

Formation age and tectonic environment of the Gantaohe Group, North China Craton: Geology, geochemistry, SHRIMP zircon geochronology and Hf-Nd isotopic systematics

et al. 2012

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The Gantaohe Group is an important early Precambrian unit in the Trans-North China Orogen, North China Craton, and is mainly composed of greenschist-facies metabasalt, meta-sandstone and dolomitic marble. We report whole-rock geochemical compositions and SHRIMP zircon ages as well as LA-ICP-MS Hf-in-zircon isotopeic analyses for metabasalts from the Gantaohe Group. SHRIMP dating yielded a weighted mean 207 Pb/ 206 Pb age of 2087±16 Ma (MSWD=1.3) for magmatic zircons, but there are also abundant ca. 2.5 Ga inherited zircon xenocrysts. The magmatic zircons shows a large  Hf (t) variation in  Hf (t) from 7.17 to +0.45, suggesting an isotopically highly heterogeneous source for the metabasalt. Chemically all samples show no distinct Zr or Hf anomalies, and some samples show no Nd or Ta anomalies in a primitive mantle-normalized trace element variation diagram, and their whole-rock  Nd (t) values range from 4.0 to 0.8. We suggest that the basalt is formed by partial melting of a depleted mantle source, followed by significant crustal contamination. Field observations, the presence of abundant inherited zircon, as well as isotope and trace elements geochemistry support formation of the Gantaohe Group on top of a continental basement. These data and the regional geology lead us to conclude that the Trans-North China Orogen constituted an intracontinental rift during the Paleoproterozoic that was connected to the Eastern Block since the end of the Archean.

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Evolution of the depleted mantle: Hf isotope evidence from juvenile rocks through time

Cited by 1,300 publications

References 115 publications

Nd–Sr–Hf–O isotope provinciality in the northernmost Arabian–Nubian Shield: implications for crustal evolution

Nd–Sr–Hf–O isotope provinciality in the northernmost Arabian–Nubian Shield: implications for crustal evolution

Early Precambrian tectonothermal events of the North China Craton: Constraints from in situ detrital zircon U-Pb, Hf and O isotopic compositions in Tietonggou Formation

Formation age and tectonic environment of the Gantaohe Group, North China Craton: Geology, geochemistry, SHRIMP zircon geochronology and Hf-Nd isotopic systematics

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