Definition of Dalradian in English:

Dalradian

adjective

Geology
  • 1Relating to or denoting a series of late Precambrian metamorphic rocks, occurring in Scotland and Ireland.

    • ‘Thus, movement along the Mannin Thrust brought mid-crustal plutons and Dalradian country rocks tectonically above the extrusive volcanic sequence.’
    • ‘The Dalradian rocks in Arran were initially folded during the Caledonian orogeny into a recumbent structure known as the Aberfoyle synform.’
    • ‘Kennedy and McKerrow observed that the Late Precambrian / Cambrian Dalradian sequences of the Scottish Highlands were deformed in the Ordovician.’
    • ‘Peak metamorphic temperatures in the Dalradian schists reached 620 30°C in the north but only c.400°C in the south.’
    • ‘There is considerable uncertainty in both the age of deposition of the Dalradian sediments in the Scottish Highlands and their subsequent metamorphism.’
    1. 1.1as noun the Dalradian The Dalradian series of rocks.
      • ‘Others have proposed a prolonged period of extension for Laurentia during which the Dalradian was deposited, and suggested that the Neoproterozoic events are related to extension.’
      • ‘Current controversy over the maximum age of the Dalradian arises from contrasting interpretations of structural and lithostratigraphical relationships, and differing geological interpretation of chronological data.’
      • ‘The age signature of detrital zircons within the Dalradian as well as the Torridonian and Moine is consistent with derivation from a Laurentian hinterland.’
      • ‘Here, the first Grampian deformation to affect the Dalradian can be matched with very low-grade rocks in the adjacent Clew Bay Complex, a dismembered accretionary complex.’
      • ‘Evidence for the maximum age of the Dalradian is ambiguous, and interpretations differ markedly.’

Origin

Late 19th century: from Dalrad-, from Dalriada (by alteration), + -ian.

Pronunciation

Dalradian

/dalˈrɑːdɪən/