Organization & Environment aims to publish rigorous and impactful research on the management of organizations and its implications for the sustainability and flourishing of the social, natural and economic environment in which they act. calculated bulk compositions), is online at. Mineral and oxide percentages along with grain size << beam size (ratio = 0.25), becomes unlikely that any microanalysisġGSA Data Repository Item 2017081, Table S1 (measured vs. METHODOLOGY blages, allowing bulk rock composition to archetypal bulk compositions are returnedīe estimated and compared with model when the sample grain size > beam size (ratio = 2.5), it work (Baker et al., 1994 McCanta et al., blage, and may include all phases in theĢ007) reproduced the melt-crystal assem- rock in their true proportions. Experimental nearly representative portion of the assem. Size to outcrop/formation scale heterogene- position as discussed above. Scales, where the ratio of hand sampling making it difficult to obtain a bulk com- Fig. Microanalysis, and also to sampling at field island arc samples are fully crystallized, small relative to the beam (ratio = 0.25 These are broadly relevant to any type of used as program inputs. Shasta, California, USA, were and forces consideration of the grain-size Required to get reproducible bulk rock line rocks, basalt and dacite compositions duces complications to sampling protocolsĬompositions in lab and field applications. Results define the number of analyses To evaluate size ratio effects in crystal- The presence of multiple phases intro. larger than the beam.Īnalyses) are varied to study errors propa- Crystalline Rocks Grain Size Rock ionic radius of an atom within either a chemical measurements in glasses orĬharacteristics (mineral and melt constitu- crystallographic matrix (mineral) or a ran- homogeneous single crystals with sizesĮnts, grain size) and analytical conditions domly distributed amorphous matrix (melt). Ing scales of measurements, rock types, either mineral size in a crystalline rock or analytical method. Grain size here refers to relative precision and accuracy of each Returned bulk rock properties from vary- pling density. This paper thus explores sampling strat- and beam conditions were calculated as a sition and account for minor heterogene-Įgies that result in the most accurate function of grain size, beam size, and sam- ities this number varies slightly with the Multiple rock types, melt compositions, erate a statistically significant bulk compo. Accuracies of bulk compositions for spot analyses are generally enough to gen. In our model results, sixĭifficulties in interpretation. Technique size runs the risk of leading to ter than accuracy. Reconcile sample size and measurement RESULTS that analytical precision is as good or bet.
KELLY AND PLING HOW TO
Sample? Any misunderstanding of how to analyses, given the reasonable expectation Single atoms or even tens of atoms record If only a single phase is present, then aĪnything about properties of the whole lasersimR5.html. Do the compositions of and the model itself is available at The atom probe (e.g., Kelly and Larson, exploration along with user input param-Ģ012 Valley et al., 2015), additional con- eters are given in McCanta et al. (STEM-EELS e.g., Garvie and Buseck, The model is built around a 2-D 1000 × standard deviation (RSD), are given inġ998 van Aken and Liebscher, 2002) and 1000 pixel image. Precision values, represented by relative Scanning transmission electron micros- represented by the average of the chosen grain size > beam size (ratio = 2.5).Ĭopy–electron energy loss spectroscopy analyses, which are randomly located. Scale of single atoms, as is the case with standard deviations of the bulk composition grain size = beam size (ratio = 1.0), and LIBS-laser-induced breakdown spectroscopy XAS-X-ray absorption spectroscopy. Iron is concentrated bottom left corner shows the sample edge. Microscopy–electron energy loss spectroscopy (STEM-EELS) large grayscale high-angle dark field image of basaltic glass. (C) Photomicrograph of basaltic magma from Kilauea Iki lava lake.
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