Magma ascent dynamics in volcanic conduits play a key role in determining the eruptive style of a volcano 1,2,3. The lack of direct observations inside the conduit means that numerical conduit models, ...

The Journal of Geology, Vol. 76, No. 3 (May, 1968), pp. 331-346 (16 pages) Trace quantities of strontium in forty-four pairs of coexisting natural potassium and plagioclase feldspars extracted from ...

This is a preview. Log in through your library . Abstract X-ray diffraction effects in the intermediate plagioclase felspars An1-xAbx, where x ~≃ 2/9 to 7/9, are explained quantitatively, as regards ...

This micrograph shows plagioclase, a type of feldspar, with a field of view of 2.7 mm. The sample hails from Brazil, and Bernardo Cesare, a geoscientist at the University of Padua, obtained it from a ...

Ever wonder how Earth scientists examine rocks? We cut them up and throw them under a microscope ... and then everything seems different. To many people, a rock is just a rock. If anyone has been ...

Geologist Nick Zentner strides excitedly across the wet sand on his first-ever visit to Oregon’s Agate Beach. But his attention is not on the scenic shore or sparkling waves. It’s on the cliff that ...