Cenozoic diatreme field in Chubut (Argentina) as evidence of phreatomagmatic volcanism accompanied with extensive Patagonian plateau basalt volcanism?

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dc.contributor.authorNemeth K
dc.contributor.authorMartin U
dc.contributor.authorHaller MJ
dc.contributor.authorAlric VI
dc.date.accessioned2007-11-30T03:34:09Z
dc.date.accessioned2016-03-06T22:25:00Z
dc.date.available2007-10-31
dc.date.available2007-11-30T03:34:09Z
dc.date.available2016-03-06T22:25:00Z
dc.date.issued2007
dc.description.abstractIn Patagonia, Argentina, at the northern border of the Patagonian Cenozoic mafic plateau lava fields, newly discovered diatremes stand about 100 m above the surrounding plain. These diatremes document phreatomagmatic episodes associated with the formation of the volcanic fields. The identified pyroclastic and intrusive rocks are exposed lower diatremes of former phreatomagmatic volcanoes and their feeding dyke systems. These remotely located erosional remnants cut through Paleozoic granitoids and Jurassic/Cretaceous alternating siliciclastic continental successions that are relatively easily eroded. Plateau lava fields are generally located a few hundreds of metres above the highest level of the present tops of the preserved diatremes suggesting a complex erosional history and potential interrelationships between the newly identified diatremes and the surrounding lava fields. Uprising magma from the underlying feeder dyke into the diatreme root zone intruded the clastic debris in the diatremes, inflated them and mingled with the debris to form subterranean peperite. The significance of identifying diatremes in Patagonia are twofold: 1) in the syn-eruptive paleoenvironment, water was available in various "soft-sediments", commonly porous, media aquifer sources, and 2) the identified abundant diatremes that form diatreme fields are good source candidates for the extensive lava fields with phreatomagmatism facilitating magma rise with effective opening of fissures before major lava effusions.
dc.format.mediumapplication/pdf
dc.identifier.harvestedMassey_Dark
dc.identifier.harvestedMassey_Dark
dc.identifier.urihttps://hdl.handle.net/10179/460
dc.publisherInternational Union of Geological Sciences
dc.subject.classificationDiatreme
dc.subject.classificationMaar
dc.subject.classificationTuff ring
dc.subject.classificationDyke
dc.subject.classificationPeperite
dc.subject.classificationScoria
dc.subject.classificationSideromelane
dc.subject.classificationFlood lava
dc.titleCenozoic diatreme field in Chubut (Argentina) as evidence of phreatomagmatic volcanism accompanied with extensive Patagonian plateau basalt volcanism?
dc.typeJournal article
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