We use cookies to distinguish you from other users and to provide you with a better experience on our websites. Close this message to accept cookies or find out how to manage your cookie settings.
We use cookies to distinguish you from other users and to provide you with a better experience on our websites. Close this message to accept cookies or find out how to manage your cookie settings.
Published online by Cambridge University Press: 17 February 2023
The ultimate source of magma erupting on Earth’s surface has always been mystifying, and it continues to be so. The Ferrar magmatic system necessitates a source that has a fairly uniform bulk composition over a large region, such that the magmas produced are broadly similar over thousands of kilometers, similar to the processes producing magma along ocean ridges and island arcs. And there must be a ready supply of massive quantities of primocrystic orthopyroxene that has an isotopic identity distinct from the basaltic magma but similar to the immediately overlying continental crust. Quartz eclogite is a possible primocryst source rock that has a large modal volume of pyroxene, and this may well exist just below the continental crust as a product of basaltic, even doleritic, materials having once been in the crust and over time sunken back into the uppermost mantle. An interaction between the continental crust and the underlying mantle has long been proposed by many scholars and here in the Ferrar is strong additional evidence for this process.
To save this book to your Kindle, first ensure [email protected] is added to your Approved Personal Document E-mail List under your Personal Document Settings on the Manage Your Content and Devices page of your Amazon account. Then enter the ‘name’ part of your Kindle email address below. Find out more about saving to your Kindle.
Note you can select to save to either the @free.kindle.com or @kindle.com variations. ‘@free.kindle.com’ emails are free but can only be saved to your device when it is connected to wi-fi. ‘@kindle.com’ emails can be delivered even when you are not connected to wi-fi, but note that service fees apply.
Find out more about the Kindle Personal Document Service.
To save content items to your account, please confirm that you agree to abide by our usage policies. If this is the first time you use this feature, you will be asked to authorise Cambridge Core to connect with your account. Find out more about saving content to Dropbox.
To save content items to your account, please confirm that you agree to abide by our usage policies. If this is the first time you use this feature, you will be asked to authorise Cambridge Core to connect with your account. Find out more about saving content to Google Drive.
