...Dongzhou Zhang; Yi Hu; Jingui Xu; Robert T. Downs; Julia E. Hammer; Przemyslaw K. Dera Abstract Nickel is an abundant element in the bulk earth, and nickel-dominant olivine, liebenbergite, is the only igneous nickel-rich silicate found in nature. In this study, we used high-pressure single-crystal...

...Carrie R. Brugger; Julia E. Hammer Abstract Crystal textures of volcanic rocks record the processes involved in magma storage and eruptive ascent. Syn-eruptive crystallization, in which groundmass crystals form and grow according to environmental factors such as thermodynamic undercooling, strongly...

...Thomas Shea; Julia E. Hammer Abstract A difficulty in performing high-temperature (>900 °C) experiments on near-liquidus hydrous mafic melts in gas-medium cold-seal pressure vessels (CSPV) is the tendency for H 2 O in the fluid phase to dissociate and H 2 to diffuse through capsule material...

...Julia E. Hammer; Thomas G. Sharp; Paul Wessel Abstract Electron backscatter diffraction analysis of dendritic clinopyroxene (cpx) forming in rapidly cooled basalt reveals two features that are unexpected for phases growing from a liquid: (1) helical growth about {010} cpx , the crystallographic b...

...Julia E. Hammer A quantitative understanding of crystallization and solidification is central to appreciating a variety of phenomena at the interface between volcanology and petrology. Interpretation of magmatic processes from the textures of erupted lavas and pyroclasts in turn depends upon...

...Julia E. Hammer Abstract Feldspar nucleation rate data obtained by laboratory decompression of hydrous silicate melt are interpreted in view of the classical theory of nucleation (CNT) and a non-classical variation, the diffuse-interface theory (DIT). The nucleation rate data can be modeled...

...Julia E. Hammer; Malcolm J. Rutherford Abstract New phase-equilibria experiments on dacite from the June 1991 eruption of Mount Pinatubo, Philippines, allow calibration of a geobarometer for matrix glass at pressures of 160–220 MPa. Comparison with natural glass compositions suggests equilibration...

..., Phillippe González-García, Diego Gonzalez-Menendez, Luis Goodenough, Kathryn Gordon, Stacia Gregory, Daniel D. Groat, Lee A. Grobety, Bernard H. Hagemann, Steffen Halenius, Ulf Hammer, Julia E. Hammerli, Johannes Hammouda, Tahar Han, Jangmi Harlov, Daniel E. Harlow, George E. Haroldson, Erik L. Hawthorne...

... upward ( Fig. 3 ). LFA6 grades into a gray to pink, laminated carbonate association analogous to LFA2 of the LCU ( Figs. 3, 7, D, E, and F ) but with a reduced siliciclastic sand component (∼1%) and featuring the branching stromatolite Tungussia julia. T. julia locally forms an impressive...

... function of e -4 t 2 was assumed. Coastal plain sediments cover about 10% of the land area of the conterminous United States and mask the underlying geology of rifting and convergence of several Wilson cycles along the southern and eastern coasts. They cover one of the most significant modern...

...Julia E. Hammer , University of Hawaii at Manoa ...

... Geological Society of America 2003 Julia E. Hammer and Malcolm J. Rutherford Geology, v. 31, p. 79–82 (January 2003) The following is a clarification/correction to the section Preeruptive Magmatic Processes At Pinatubo. The intended calculation was to find the change...

...Julia Eve Hammer *E-mail: [email protected] © 2009 Geological Society of America 2009 Attribution: You must attribute the work in the manner specified by the author or licensor ( but no in any way that suggests that they endorse you or your use of the work). Noncommercial ‒ you...

... National Science Foundation via Project funding (grant 188632) to L.P. Baumgartner and by the Ambizione fellowship (grant PZ00P2_216313) to J. Gillespie. We are grateful to Marc Norman for efficient editorial handling and to Julia Hammer and Benoît Welsch for their constructive reviews of our manuscript...

... V P and V S velocity structure of the sediment for each station is available in the Ⓔ electronic supplement to this article. We also compared our V P and V S average velocities with the values found for the 12 New Madrid stations that were studied in Julia et al. (2004...

... and shape are characteristic of rapid decompression followed by storage at low pressures, while wide range of crystal size and shape in E may reflect slower rates of decompression ( Hammer and Rutherford, 2002 ); scale bar is 10 μm. In detail, although ash samples from March 28 contain mostly...

..., both professionals and students. Comments by Sarah Barnes, Julia Hammer, and Alan Boudreau improved this paper. These ideas were initiated during a sabbatical at Université Blaise-Pascal, Clermont-Ferrand, France. This research was funded by the Natural Science and Engineering Research Council...

... Tables. Deposit items are free to all readers and found on the MSA web site, via the specific issue's Table of Contents (go to http://www.minsocam.org/MSA/AmMin/TOC/2018/May2018_data/May2018_data.html ). * E-mail: [email protected] Manuscript handled by Julia Hammer Under...

... members of the nominating team are greatly appreciated, but special thanks go to Sumit Chakraborty, Jiba Ganguly, and Julia Hammer. Last and by far the most important, I'm grateful more than I have the words to express to my wife Susan, who for almost three decades has done the lion's share of running...