Upper mantle reflector structure and origin beneath the Scottish Caledonides

Article Abstract:

Neoproterozoic events associated with rifting of the Laurentia-Baltica supercontinent may be responsible for the mantle reflector structure beneath the Scottish Caledonides. The mantle has two distinct discontinuous surfaces consisting of a steep, downward antiform-synform pair below the West Orkney basin and the Faeroe-Shetland basin with a suspected zone of structural disruption in between. The surfaces were probably once continuous and may have been deformed by crustal extension and/or east-west zone of upper mantle shear that created the disrupted zone at the crust.

Scotland, Observations, Earth, Geology, Structural, Structural geology, Mantle (Geology), Rifts (Geology)

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A dual doubly vergent orogen in the Banda Arc continent-arc collision zone as observed on deep seismic reflection profiles

Article Abstract:

Numerical modeling of the double vergent orogenic belts in the Banda Arc, Indonesia, indicates a northward transfer of the mantle subduction zone, or a northward translation of crustal thrusts over a lower crustal detachment. A period of igneous activity was followed by a cessation of activity and the uplifting of the accretionary Outer Banda Arc. Reflectors below the northern margin of the arc dip southward, and act as a backstop to the accretionary complex.

Indonesia, Rocks, Igneous, Igneous rocks, Subduction zones (Geology), Subduction zones, Island arcs

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Does the Great Glen fault really disrupt Moho and upper mantle structure?

Article Abstract:

The Great Glen strike-slip fault infringes the crust and upper layer that results in the Moho step or fracture. This has become a feature of the British Isles. Research shows that the fracture is prepared by a keel that emerges on the Moho discontinuity under the fault. Beneath the keel is a mantle image that is blocked by a downward progression in the fault structure.

United Kingdom, Strike-slip faults (Geology), Strike-slip faults

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