U Pb Dating Of Zircon In The Granite

It can be used to date rocks that formed and crystallised from about 1 million years to over 4 5 billion years ago with routine precisions in the 0 1 1 percent range.

U pb dating of zircon in the granite.

The u pb apatite ages are variable in the north of the sinforosa lineament and range from 86 51 ma. Combined la mc icp ms u pb dating of igneous zircon and la icp ms u pb dating of hydrothermal cassiterite are used to constrain the timing of granitic magmatism and hydrothermal mineralization. Zircon from the three granite units has a weighted average 206 pb 238 u age of 159 8 0 3 ma 2 σ mswd 0 3. These samples were selected for la icp ms zircon u pb dating hornblende 40 ar 39 ar analyses whole rock geochemistry and biotite chemistry studies.

Sample xq 6 was collected from fresh outcrops of the diabase in the changjiang area. Zircon u pb dating from flesh red porphyritic granite. Granite crystallization was at 219 2 ma followed by the sillimanite grade regional metamorphism at 185 2 ma. 2005 recognized a rapakivi granite with a shrimp u pb zircon age of 1839 10 ma from the yangyang district in the northeastern part of the gyeonggi massif in south korea fig.

The 30 analyses of the magmatic zircon cores yielded th u ratios of 0 11 0 19. The u pb age data of 70 analysed domains of 46 zircons from one flesh red porphyritic granite sample jn5 could be divided into three discrete and meaningful age groups. La icp ms zircon u pb dating suggests that the pgm me dium to coarse grained biotite granite was emplaced in the early paleozoic corresponding to magmatism of the cale donian orogensis in the traditional sense. The pgm granite batholith represents multiple episodes of magma intrusions.

This indicates variable cooling rates and moderate to shallow emplacement. Uranium lead dating abbreviated u pb dating is one of the oldest and most refined of the radiometric dating schemes. Zircon u pb dating whole rock and sr nd isotope geochemistry of the reshian granite gneiss of indian shield in jhelum valley lesser himalayas azad kashmir pakistan october 2019. The cathodoluminescence cl textures indicate that some of the cassiterite crystals from the wolframite cassiterite quartz vein system have growth zonations i e.

Zone i in the core. The u pb ages of zircon from the hua hin gneissic granite in the hub kapong to pran buri area scatter from 250 ma to 170 ma on the concordia. The aplitic dyke is also of the early paleozoic u pb age. These apatite dates are 1 28 ma younger than the corresponding zircon u pb crystallization ages.

Zircon grains were separated from fresh rocks from the granites in the zhuguangshan complex.