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JOURNAL OF GEOPHYSICAL RESEARCH,
VOL. 110,
B01201,
12 PP., 2005
doi:10.1029/2003JB002841
Distinguishing between primary and secondary emplacement events of blocky volcanic deposits using rock size distributions
Joint Center for Earth Systems Technology, University of Maryland, Baltimore County, Baltimore, Maryland, USA
Proxemy Research, Bowie, Maryland, USA
Geology and Planetary Science Department, Black Hill State University, Spearfish, South Dakota, USA
Proxemy Research, Bowie, Maryland, USA
Rock size characteristics in rock avalanches and blocky lava flows are different and statistical techniques can be used both to distinguish between and to constrain the different emplacement mechanisms of these two processes. At the Chaos Jumbles rock avalanche deposit in California, rock sizes decrease as a function of distance. The rock avalanche mechanism is an example of a secondary process that can only break existing blocks. In contrast, lava flows at Sabancaya, Peru, were emplaced by primary mechanisms capable of creating as well as breaking blocks. These deposits exhibit uniform block sizes as functions of distance and significantly larger blocks overall than Chaos Jumbles. Rock sizes at Inyo domes, also emplaced by a primary process, are significantly smaller in areas with compressional ridges as compared to vent or jumbled areas.
Received 10 October 2003; accepted 27 October 2004; published 15 January 2005.
Citation: (2005), Distinguishing between primary and secondary emplacement events of blocky volcanic deposits using rock size distributions, J. Geophys. Res., 110, B01201, doi:10.1029/2003JB002841.
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