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detrital zircon
Fission-track dating of zircon showed that sandstones from this zone contain detrital zircon of several different-age populations.
      
Thus, results of dating of detrital zircon grains from sandstones, which did not experience heating above 215-240°C, indicate that this method is appropriate for dating fossil-free terrigenous sequences.
      
SHRIMP U-Pb analyses of detrital zircon: a window to understanding the Paleoproterozoic development of the Tanami Region, northe
      
Dating of detrital zircon from six of the principal sedimentary units shows that deposition spanned at least the period ~1.84-1.77?Ga.
      
Collectively, the detrital zircon ages reveal a progression in provenance that is a record of the development of the orogen.
      
U-Pb isotopic analyses were made on detrital zircon populations from sandstones and quartzites of the pre-Permian basement in an attempt to shed light on the presedimentary history of the zircons and the age of their primary source rocks.
      
The youngest detrital zircon grain provides a maximum depositional age of about 565 Ma.
      
Detrital zircon ages from southern Norway - implications for the Proterozoic evolution of the southwestern Baltic Shield
      
Even in the extreme conditions of long-lasting high temperature (750-800?°C) metamorphism, Pb inheritance is widely preserved in the detrital zircon cores.
      
Detrital zircon cores of >amp;gt;460?Ma place an older limit on the age of anatexis, and show that the paragneiss sequence contains rocks at least as young as early Cambrian.
      
Zircon outgrowths are present on detrital zircon grains in many very low to low-grade metasedimentary rocks worldwide, ranging in age from mid-Archaean to Palaeozoic.
      
The outgrowths comprise minute (typically >amp;lt;3?μm) crystals that form an irregular fringe on detrital zircon grains, and in a few cases, on diagenetic xenotime outgrowths.
      
The youngest detrital zircon cores of the paragneiss yielded ca.
      
Previous geochronology has shown that the monazite cores are older than 1.9?Ga and overlap with the ages of detrital zircon grains (~3.5-2.0?Ga), consistent with a detrital origin.
      
The petrography, detrital zircon morphologies and geochemistry suggest affinity with, and derivation in large part from, acid volcanic rocks at a comparable stratigraphic position in a separate tectonostratigraphic unit to the south.
      
Two detrital zircon populations of 1.9 and 1.6?Ga indicate Early-Middle Proterozoic material in the former setting of the basement.
      
Variscan detrital zircon FT ages indicate source areas that had not suffered Alpine metamorphism, such as the Bakony Mountains, Drauzug and the Southern Alps.
      
Another group of detrital zircon grains of Late Triassic-Jurassic FT age (mean: ~183?Ma) marks source zones with Mesozoic thermal overprint such as the Gurktal Alps and some Austroalpine regions.
      
New detrital zircon ages and geochemical compositions of Late Neoproterozoic siliciclastic sediments confirm a deposition of the volcano-sedimentary successions of the TBU in a back-arc basin.
      
Ion microprobe (SHRIMP) dating of detrital zircon grains from quartzites of the Eckergneiss Complex, Harz Mountains (Germany): i
      
 

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