Matches in SemOpenAlex for { <https://semopenalex.org/work/W560838049> ?p ?o ?g. }
Showing items 1 to 84 of
84
with 100 items per page.
- W560838049 abstract "The recent rhyolitic eruptions at Chaiten and Cordon Caulle have provided valuable new insights into the relationship between explosive and effusive activity, and the gas escape mechanisms that permit rapid effusion of degassed lava[1,2]. Bombs ejected during mixed explosive-effusive activity host spectacular tuffisite veins cutting both dense obsidian (Fig 1a) and highly-expanded pumice. Tuffisite veins are ash-filled fracture networks that act as ephemeral permeable pathways for gas escape in shallow conduits and lava domes. Previous studies have revealed water depletion adjacent to tuffisite veins, leading to models of fracture-triggered pressure release[2] and estimates of gas escape timescales[2,3]. We have characterised water diffusion profiles from a new suite of tuffisite-bearing Chaiten bombs, using synchrotron-source FTIR at the Diamond Light Source, Oxford, UK. Unexpectedly, one exceptionally large tuffisite vein, which is 30 mm thick (Fig. 1a, b) is mantled by zones of strong water enrichment, which enclose the usual narrow depletion zones immediately adjacent to the vein (Fig. 1c). Consistent results from different branches of this vein (Fig. 1b) indicate a similar history. The plausible range of diffusion model solutions points towards ~2-4 hours of vein pressurisation, followed by a brief pre-quench period of lower pressure conditions. In our model the vein opened during a period of overpressure at the lava dome base, sustained by gas influx from a deeper catchment extending hundreds of metres into the upper conduit. Overpressure culminated in violent bomb ejection, after which vein pressure decreased due to gas leakage to the atmosphere through the incompletely welded vein, as observed in rhyolitic bombs from Cordon Caulle (Fig. 1d). Commonly-seen water depletion zones[2,3] may therefore merely record post-fragmentation degassing. However, the enrichment zone points towards the type of deep pressurisation associated with cycles of tilt and seismicity at lava domes[4], but with vein formation arguably driven by hydrofracture[5], rather than shear failure. 1 Schipper CI et al, 2013 JVGR 262, 25–37. 2 Castro JM et al 2012, EPSL 333-334, 63-69. 3 Cabrera A et al 2011, Geology 39, 67–70. 4 Neuberg JW et al 2006, JVGR 153, 37–50. 5 Heiken G et al 1988, JGR 93, 4335–4350." @default.
- W560838049 created "2016-06-24" @default.
- W560838049 creator A5013280518 @default.
- W560838049 creator A5014514589 @default.
- W560838049 creator A5018370687 @default.
- W560838049 creator A5041989765 @default.
- W560838049 creator A5046090643 @default.
- W560838049 creator A5049587701 @default.
- W560838049 creator A5055427574 @default.
- W560838049 creator A5063130064 @default.
- W560838049 creator A5064226862 @default.
- W560838049 creator A5064676111 @default.
- W560838049 date "2015-01-01" @default.
- W560838049 modified "2023-09-28" @default.
- W560838049 title "Pressure changes before and after explosive rhyolitic bomb ejection at Chaiten, Chile recorded by water diffusion profiles around Tuffisite veins" @default.
- W560838049 hasPublicationYear "2015" @default.
- W560838049 type Work @default.
- W560838049 sameAs 560838049 @default.
- W560838049 citedByCount "0" @default.
- W560838049 crossrefType "journal-article" @default.
- W560838049 hasAuthorship W560838049A5013280518 @default.
- W560838049 hasAuthorship W560838049A5014514589 @default.
- W560838049 hasAuthorship W560838049A5018370687 @default.
- W560838049 hasAuthorship W560838049A5041989765 @default.
- W560838049 hasAuthorship W560838049A5046090643 @default.
- W560838049 hasAuthorship W560838049A5049587701 @default.
- W560838049 hasAuthorship W560838049A5055427574 @default.
- W560838049 hasAuthorship W560838049A5063130064 @default.
- W560838049 hasAuthorship W560838049A5064226862 @default.
- W560838049 hasAuthorship W560838049A5064676111 @default.
- W560838049 hasConcept C113754120 @default.
- W560838049 hasConcept C114793014 @default.
- W560838049 hasConcept C118552586 @default.
- W560838049 hasConcept C120806208 @default.
- W560838049 hasConcept C121332964 @default.
- W560838049 hasConcept C127313418 @default.
- W560838049 hasConcept C15744967 @default.
- W560838049 hasConcept C17409809 @default.
- W560838049 hasConcept C24343810 @default.
- W560838049 hasConcept C2777202286 @default.
- W560838049 hasConcept C29452850 @default.
- W560838049 hasConcept C5900021 @default.
- W560838049 hasConcept C97355855 @default.
- W560838049 hasConceptScore W560838049C113754120 @default.
- W560838049 hasConceptScore W560838049C114793014 @default.
- W560838049 hasConceptScore W560838049C118552586 @default.
- W560838049 hasConceptScore W560838049C120806208 @default.
- W560838049 hasConceptScore W560838049C121332964 @default.
- W560838049 hasConceptScore W560838049C127313418 @default.
- W560838049 hasConceptScore W560838049C15744967 @default.
- W560838049 hasConceptScore W560838049C17409809 @default.
- W560838049 hasConceptScore W560838049C24343810 @default.
- W560838049 hasConceptScore W560838049C2777202286 @default.
- W560838049 hasConceptScore W560838049C29452850 @default.
- W560838049 hasConceptScore W560838049C5900021 @default.
- W560838049 hasConceptScore W560838049C97355855 @default.
- W560838049 hasLocation W5608380491 @default.
- W560838049 hasOpenAccess W560838049 @default.
- W560838049 hasPrimaryLocation W5608380491 @default.
- W560838049 hasRelatedWork W1972869395 @default.
- W560838049 hasRelatedWork W1974765650 @default.
- W560838049 hasRelatedWork W1978390008 @default.
- W560838049 hasRelatedWork W1994163940 @default.
- W560838049 hasRelatedWork W1996803292 @default.
- W560838049 hasRelatedWork W2027663896 @default.
- W560838049 hasRelatedWork W2045607684 @default.
- W560838049 hasRelatedWork W2056090476 @default.
- W560838049 hasRelatedWork W2059490415 @default.
- W560838049 hasRelatedWork W2069792097 @default.
- W560838049 hasRelatedWork W2075801722 @default.
- W560838049 hasRelatedWork W2107904263 @default.
- W560838049 hasRelatedWork W2110743168 @default.
- W560838049 hasRelatedWork W2285281794 @default.
- W560838049 hasRelatedWork W2588317788 @default.
- W560838049 hasRelatedWork W2901661591 @default.
- W560838049 hasRelatedWork W2982294437 @default.
- W560838049 hasRelatedWork W3176837578 @default.
- W560838049 hasRelatedWork W189467942 @default.
- W560838049 hasRelatedWork W85889115 @default.
- W560838049 hasVolume "2014" @default.
- W560838049 isParatext "false" @default.
- W560838049 isRetracted "false" @default.
- W560838049 magId "560838049" @default.
- W560838049 workType "article" @default.