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"Magmatic records from the Karakoram terrane: U–Pb zircon ages from gra" by Wanchese M. Saktura, Solomon Buckman et al.

The Karakoram terrane is a sliver of peri-Gondwana continental crust preserved within the Karakoram and Saltoro ranges in Ladakh, India. It became a part of Eurasia during the Jurassic, and until Late Cretaceous its southern margin was an active continental margin represented by the Karakoram (Arc) Batholith. Its magmatism is thought to be extinguished during Late Cretaceous by collision with the Shyok ophiolite, however, geochronological data are limited. The Karakoram terrane is a key element in the geodynamics of Himalaya and more studies are needed to improve geological understanding and tectonic evolution of the southern margin of Eurasia pre- and post- final continental collision with the Indian continent. We present petrographic, geochemical, and geochronological observations for anatectic magmatism which formed granitic intrusions within the terrane at c. 14 Ma and 12 Ma. Results from detrital zircon dating of modern sediments from the Karakoram terrane reveal three distinct ag ....

Jammu And Kashmir , Late Cretaceous , Shyok Suture , Ircon Geochronology ,

"Seeking Earth's oldest geological record: an unexpected discovery of w" by A. P. Nutman

One of Greenland’s largest bodies of Archean (meta)sedimentary rocks occurs on the ∼5.5 by 2.0 km nunatak Isortup Nunataa (∼65°31′N 49°54′W) and is ∼35 km north of the Eoarchean Isua supracrustal belt with its world’s best record of early sedimentary and volcanic systems. The nunatak was visited to ascertain if its metasedimentary rocks are also Eoarchean and thereby provide extra insight into the early Earth. The metasedimentary rocks are derived from a ca 3060 Ma arc-like volcanogenic source and can be assigned to the Akia terrane that crops out immediately to the west. However, glacial erratics scattered over the nunatak indicate there are well-preserved Eoarchean rocks including 3834 Ma metatonalite hidden to the east under the Inland Ice. This demonstrates there are still occurrences of Eoarchean rocks out there to be found by a mix of logic and luck. These findings will all enhance our knowledge of the early Earth, to help answer the big questions about the import ....

Inland Ice , Greenland General , Eoarchean Isua , Isortup Nunataa , West Greenland , Yearly Earth , Unatak Isortup Nunataa , Ircon Geochronology ,