Introduction. Acapulcoites and lodranites constitute two related groups of " primitive achon-drites " [1-3] that possess recrystallized textures, chondritic mineralogy, planetary-type rare gases, and approximately chondritic bulk compositions. They are widely considered to have formed by partial melting of chondritic material [4-10]. Although Kallemeyn and Wasson [11] suggested that acapulcoite...

The 56 ka Monte Epomeo Green Tuff (MEGT) resulted from the largest volume explosive eruption Ischia island (south Italy). Its tephra is one of main stratigraphic markers central Mediterranean area. Despite its importance, a detailed characterisation petrography and mineral chemistry MEGT lacking. To fill this gap, we present petrographic description electron microprobe data on samples collected...

features of the area. Sills of hornblende-porphyritic clioritc, are part of the Hedley Intrusive suite believed to bc Latf Triassic or Early Jurassi.: (199 Ma based on U-Pb dates 0 ' zircons from the Banbury stock, 3.5 kilometres west o' Hedley). In this location the sills, which vary.from I to 2f' metres in thickness, make up almost 50 per cent '3f thl: stratigraphic column whtxe they intrude ...

The decay features of thirty-nine monuments built with granite stones and presenting diverse architectural characteristics, date of construction and environment characteristics (including exposition conditions, traffic intensity, etc) are compare in order to discuss decay patterns and susceptibility of granite types applied in architectural works. Decay patterns of biotite-rich medium to fine-g...

electrical steels are important alloys widely used in electrical instruments. the magnetic properties and low core loss of grain oriented silicon steels are closely related to the sharpness of goss texture ({110} ).the direction of is the softest direction for magnetism.  in this work, the microstructure and dependence of orientation density along the major texture fibers on the applied cold ro...