Details

Autor(en) / Beteiligte

• Wiens, Douglas A.

Titel

Diamonds Hold Clues About the Cause of Deep Earthquakes

Ist Teil von

• AGU advances, 2021-06, Vol.2 (2), p.n/a

Ort / Verlag

Hoboken: John Wiley & Sons, Inc

Erscheinungsjahr

2021

Quelle

EZB Electronic Journals Library

Beschreibungen/Notizen

• The results show that for colder subducting slabs, antigorite and chlorite in mantle peridotite will transfer water to a series of dense hydrous magnesium silicate phases (10 angstrom phase, phase A, phase E, and phase D), thus delivering water to the transition zone. Slabs with deep earthquakes retain water to transition zone depths, whereas slabs without deep earthquakes are predicted to dehydrate at intermediate depths. [...]thermal modeling suggests the delivery of hydrous minerals to the transition zone may be a necessary condition for deep earthquakes. Thermal models showing that volatiles are delivered to the transition zone in cold slabs with deep earthquakes but escape at shallower depths in warmer slabs lacking deep earthquakes provide important evidence. Since slab temperature controls many factors related to possible faulting mechanisms, similar arguments about the occurrence of deep earthquakes in warm and cold slabs have been made for other deep earthquake mechanisms (e.g. Kirby et al, 1996).