Dating metamorphic rocks


06-Nov-2019 18:55

Moon rock samples collected during the Apollo missions have been dated to about 4.5 billion years, besting our oldest terrestrial rocks by a few hundred million years. Email it to Life's Little Mysteries and we'll try to answer it.Due to the volume of questions, we unfortunately can't reply individually, but we will publish answers to the most intriguing questions, so check back soon.Thus, if well-dated, unaltered fossil shells containing strontium from ancient seawater are analyzed, changes in this ratio with time can be observed and applied in reverse to estimate the time when fossils of unknown age were deposited.The rubidium–strontium pair is ideally suited for the isochron dating of igneous rocks.Thus, a precise measurement of the Sr ratio in a modern volcano can be used to determine age if recycled older crust is present.A ratio for average continental crust of about 0.72 has been determined by measuring strontium from clamshells from the major river systems.Geologists categorize rocks into three basic types, depending on their origin.

Rubidium is a relatively abundant trace element in Earth’s crust and can be found in many common rock-forming minerals in which it substitutes for the major element potassium.Finding the oldest rocks in the world is a harder task than it might seem.



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