Naturally decorated dislocations in olivine from peridotite xenoliths

Dislocations decorated by hematite and magnetite have been observed optically in the olivine grains of undeformed or highly annealed peridotite xenoliths from Hawaii and Baja California ( 5 × 10⁵ cm^–2). The observed structures include loops, low-angle boundaries, and structures produced by multiple cross-glide of [100] screws. Loops are almost invariably parallel to (001). Simple arrays of parallel dislocations lie predominantly in (100), (010) and (001) with dislocation lines subparallel to low-index directions. [100] screws pinned to (100) boundaries are frequently seen to bow out on (001). Preliminary electron petrography has confirmed that all dislocations are decorated.     

Rapid changes of sediment dynamic processes in Yalu River Estuary under anthropogenic impacts

The response of the Yalu River Estuary to human activities was investigated.Changes of sediment dynamics during the past 10 years were explored through hydrodynamic calculation,as well as heavy mineral...