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[email protected] The Trans-Suture Suite (TSS) of calc-alkaline granite plutons straddle both sides of the Iapetus Suture in Northern Britain.
We report the first study of zircon U–Pb, O and Hf isotopes from magmatic zircons from three TSS granites.
The discovery of magnetic anomalies was crucial evidence for sea floor spreading.
Mantle The zone lying between the Earth’s crust and core.
Ages of 410 ± 6 Ma for the Criffell pluton, 416 ± 5 Ma for the Shap pluton and 410 ± 3 Ma for the outer zone of the Fleet pluton are coincident with the intrusion of regionally prolific lamprophyre dykes within transtensional tectonic environments.
Resolvable age differences between the outer and inner two zones of the Fleet pluton (387 ± 5 Ma) suggest two distinct stages of emplacement that bracket an ∼10 Myr phase of transpression recognized from geological evidence.
There's a small amount of radioactive carbon-14 in all living organisms.
When they die no new carbon-14 is taken in by the dead organism.
Later called Ötzi the Iceman, small samples from his body were carbon dated by scientists.The carbon-14 it contained at the time of death decays over a long period of time.By measuring the amount of carbon-14 left in dead organic material the approximate time since it died can be worked out.Zircon Hf model ages (0·9–1·0 Ga) indicate that most reworked crust was of Avalonian origin, consistent with geophysical evidence for underlying Avalonian crust beneath the Iapetus Suture.
Stephen joined the School in 1981 and has been a Senior Lecturer since 1998 and Associate Professor of Petrology since 2006.
These features imply that the Shap Granite formed in 6–10 days and its Po radiohalos within hours to days once the granite cooled below 150°C.