Lu–hf garnet geochronology: closure temperature relative to the Sm–Nd system and the effects of trace mineral inclusions

Scherer, Erik E.; Cameron, Kenneth L.; Blichert‐Toft, Janne

doi:10.1016/s0016-7037(00)00440-3

Cited by 407 publications

(250 citation statements)

References 47 publications

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“…This process was already described well for garnet Lu-Hf and Sm-Nd ages (Scherer et al, 2000). In general, their results predict that increasing contamination pulls isotopic compositions below the true-age isochron.…”

Section: Garnet Growth Zoning and High Mswd'ssupporting

confidence: 61%

“…The Lu-Hf dating method is much less sensitive to inclusions because garnet Lu concentrations are high, and because contamination by Hf-rich phases can be readily avoided. Few common minerals except zircon and rutile take up significant Hf, and benchtop dissolution minimizes any zircon and rutile contamination (e.g., Scherer et al, 2000;Connelly, 2006;Lagos et al, 2007 greater ranges in isotopic values. Uncertainties in isotopic ratios were assumed to be 0.5% for interelement ratios.…”

Section: Sampling and Sample Processing Strategiesmentioning

confidence: 99%

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Models of garnet differential geochronology

Kohn

2009

Geochimica et Cosmochimica Acta

124

100

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Section: Garnet Growth Zoning and High Mswd'ssupporting

confidence: 61%

Section: Sampling and Sample Processing Strategiesmentioning

confidence: 99%

Models of garnet differential geochronology

Kohn

2009

Geochimica et Cosmochimica Acta

124

100

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“…Initial ε Nd values of the Penglai Group, calculated back to 1.2 Ga (Table 2), range from -6.4 to -1.7, also distinguishably higher than those of the basement rocks from the North China block, when compared at 1.2 Ga (data compiled by Wu et al, 2005). The zircon Lu-Hf isotopic system is commonly accepted to have a very high isotopic closure temperature such that Hf isotopic composition of zircon can preserve source information, even for high-grade metamorphic rocks, such as granulites (Scherer et al, 2000). Therefore, compared to whole-rock Sm-Nd data, we believe that Hf isotopic composition of detrital zircon grains, obtained by the LA-MC-ICP MS in-situ method, can be more suitable for offering information about the source characteristics of sedimentary rocks.…”

Section: Nd-hf Isotopic Constraints On Sedimentary Sourcesmentioning

confidence: 98%

South China provenance of the lower-grade Penglai Group north of the Sulu UHP orogenic belt, eastern China: Evidence from detrital zircon ages and Nd-Hf isotopic composition

Chen

Guo

et al. 2007

Geochem. J.

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The Dabie-Sulu ultrahigh-pressure orogenic belt resulted from the early Mesozoic collision of the North China block and South China block (comprising the Yangtze and the Cathaysia) and subsequent exhumation of the subducted South China continental slabs. This belt consists of tectonically juxtaposed rock units of different metamorphic grade. Provenance of the low-grade metamorphic terranes exposed along the northern part of the belt can offer useful information about the location of the boundary between these two continental blocks. This study reports detrital zircon ages and Nd-Hf isotopic composition of sedimentary rocks of the low-grade Penglai Group, situated north of the Sulu UHP terrane. Results show that detrital zircon grains mostly crystallized during Mesoproterozoic time, clustering at 1.7 Ga to 1.6 Ga and 1.2 Ga. Nd isotopic composition (T DM value) of the Penglai Group suggests that sedimentary sources are similar to average crustal material of the Yangtze block and mostly formed in Paleo-to Mesoproterozoic. Late Mesoproterozoic detrital zircons probably demonstrate that sedimentary material was derived from the boundary of the Yangtze and Cathaysia blocks, which was formed by the late Mesoproterozoic convergence. Absence of Neoproterozoic detrital zircons from the Penglai sediments probably suggests a late Mesoproterozoic to early Neoproterozoic deposition age (about 1.1 Ga to 0.8 Ga). The age and isotopic evidence implies that the Penglai Group originated from the South China block and probably was thrust onto the basement of the North China block during the early Mesozoic continental collision.

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“…The long-lived 176 Hf chronometer benefits from a large range in P/D among different minerals and a high closure temperature in silicates (e.g., Scherer et al, 2000) and apatite (Barfod et al, 2003); therefore, it is potentially precise and robust against post-crystallisation heating and shock. Unsupported 176 Hf has been observed in many meteorites however, resulting in Lu-Hf dates that are up to 300 Myr older than the Pb-Pb age of the Solar System (e.g., Blichert-Toft et al, 2002;Bizzarro et al, 2012).…”

confidence: 99%