Pb, U and Th diffusion in natural zircon

Lee, James K.W.; Williams, Ian S.; Ellis, David J.

doi:10.1038/36554

Cited by 646 publications

(283 citation statements)

References 14 publications

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“…9a and b). The fact that the whole rock eNd(t) values are somewhat more negative than the zircon eHf(t) may have been the result of lower closure temperatures in some components in the whole rock samples (plagioclase: 350-400°C; Grove et al, 1984) than in the zircons (>900°C; Lee et al, 1997). The geochemistry of the diorite dikes is consistent with them being derived from a depleted mantle source, similar to that proposed for other sanukitoids (Beyth et al, 1994;Heilimo et al, 2010;Martin, 1999;Martin et al, 2009Martin et al, , 2005.…”

Section: Petrogenesissupporting

confidence: 71%

Geochronology and geochemistry of the high Mg dioritic dikes in Eastern Tianshan, NW China: Geochemical features, petrogenesis and tectonic implications

Zhang

Chen

et al. 2016

Journal of Asian Earth Sciences

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Section: Petrogenesissupporting

confidence: 71%

Geochronology and geochemistry of the high Mg dioritic dikes in Eastern Tianshan, NW China: Geochemical features, petrogenesis and tectonic implications

Zhang

Chen

et al. 2016

Journal of Asian Earth Sciences

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“…7) for samples 11 (Kopaonik), 513 (Polumir), and 447 (Jošanica valley); the thick grey lines represent an estimate of the complete t-T-evolution that also take into account the age and estimated temperature of crystallization of the zircons. The U-Pb closure temperature corresponding to the zircon crystallization in sample 11 (Kopaonik quartz-monzonite) was assumed to be around 820°C (Lee et al 1997). The S-type granite sample 513 (Polumir) must have intruded at lower temperatures due to its different melting temperature.…”

Section: Apazmentioning

confidence: 99%

Cenozoic granitoids in the Dinarides of southern Serbia: age of intrusion, isotope geochemistry, exhumation history and significance for the geodynamic evolution of the Balkan Peninsula

Schefer¹,

Cvetković

Fügenschuh

et al. 2010

Int J Earth Sci (Geol Rundsch)

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Two age groups were determined for the Cenozoic granitoids in the Dinarides of southern Serbia by high-precision single grain U-Pb dating of thermally annealed and chemically abraded zircons: (1) Oligocene ages (Kopaonik, Drenje, Ž eljin) ranging from 31.7 to 30.6 Ma (2) Miocene ages (Golija and Polumir) at 20. 58-20.17 and 18.06-17.74 Ma, respectively. Apatite fission-track central ages, modelling combined with zircon central ages and additionally, local structural observations constrain the subsequent exhumation history of the magmatic rocks. They indicate rapid cooling from above 300°C to ca. 80°C between 16 and 10 Ma for both age groups, induced by extensional exhumation of the plutons located in the footwall of core complexes. Hence, Miocene magmatism and core-complex formation not only affected the Pannonian basin but also a part of the mountainous areas of the internal Dinarides. Based on an extensive set of existing age data combined with our own analyses, we propose a geodynamical model for the Balkan Peninsula: The Late Eocene to Oligocene magmatism, which affects the Adriaderived lower plate units of the internal Dinarides, was caused by delamination of the Adriatic mantle from the overlying crust, associated with post-collisional convergence that propagated outward into the external Dinarides. Miocene magmatism, on the other hand, is associated with core-complex formation along the southern margin of the Pannonian basin, probably associated with the W-directed subduction of the European lithosphere beneath the Carpathians and interfering with ongoing Dinaridic-Hellenic back-arc extension.

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“…This method is commonly used to date Phanerozoic zircons using in situ methods [42,47]. The closure temperature of magmatic zircon is usually higher than 900°C [48,49], in any case higher than 750-800°C [50], while the peak metamorphism temperature in upper HCS in this area is 570-690°C (samples N10 and N12 of Hodges et al [51]), suggesting that the zircon crystallization ages will be preserved.…”

Section: Results and Analysis Of Monazite-zircon U-th/pb Agesmentioning

confidence: 99%

Ductile deformation within Upper Himalaya Crystalline Sequence and geological implications, in Nyalam area, Southern Tibet

Liu

Leloup

et al. 2012

Chin. Sci. Bull.

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The South Tibet Detachment System (STDS) is a flat normal fault that separates the Upper Himalaya Crystalline Sequence (UHCS) below from the Tethyan Sedimentary Sequence (TSS) above. Timing of deformations related to the STDS is critical to understand the mechanism and evolution of the Himalaya collision zone. The Nyalam detachment (ND) (~86°E) locates in the middle portion of STDS (81°-89°E). Dating of deformed leucocratic dykes that are most probably syntectonic at different depth beneath the ND, allow us to constrain the timing of deformation. (1) Dyke T11N37 located ~3500 m structurally below the ND emplaced at 27.4± 0.2 Ma; (2) Dyke T11N32 located ~1400 m structurally below the ND emplaced at 22.0±0.3 Ma; (3) T11N25 located within the top to the north STD shear zone, ~150 m structurally below the ND, emplaced at 17.1±0.2 Ma. Combining ND footwall cooling history and T11N25 deformation temperature, we indicate a probable onset of top to the north deformation at ~16 Ma at this location. These results show an upward younging of the probable timing of onset of the deformation at different structural distance below the ND. We then propose a new model for deformation migration below the ND with deformation starting by pure shear deformation at depth prior to ~27.5 Ma that migrates upward at a rate of ~ 0.3 mm/a until ~18 Ma when deformation switches to top to the north shearing in the South Tibet Detachment shear zone (STDsz). As deformation on the ND stops at 14-13 Ma this would imply that significant top to the North motion would be limited to less than 5 Ma and would jeopardize the importance of lower channel flow.

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Pb, U and Th diffusion in natural zircon

Cited by 646 publications

References 14 publications

Geochronology and geochemistry of the high Mg dioritic dikes in Eastern Tianshan, NW China: Geochemical features, petrogenesis and tectonic implications

Geochronology and geochemistry of the high Mg dioritic dikes in Eastern Tianshan, NW China: Geochemical features, petrogenesis and tectonic implications

Cenozoic granitoids in the Dinarides of southern Serbia: age of intrusion, isotope geochemistry, exhumation history and significance for the geodynamic evolution of the Balkan Peninsula

Ductile deformation within Upper Himalaya Crystalline Sequence and geological implications, in Nyalam area, Southern Tibet

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