Jack M. Simmons
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View article: Characterizing some major Archean faults at depth in the Superior craton, North America
Characterizing some major Archean faults at depth in the Superior craton, North America Open
The geometry of ancient (2.75–2.65 Ga) faults at depth can only be mapped in detail by high-resolution geophysical surveys such as seismic reflection profiling. Recent deep (35–48 km) reflection profiles acquired throughout the Archean sou…
View article: Trans‐Crustal Geophysical Responses Beneath the Supergiant Timmins‐Porcupine Orogenic Gold Camp, Canada
Trans‐Crustal Geophysical Responses Beneath the Supergiant Timmins‐Porcupine Orogenic Gold Camp, Canada Open
A new 80‐site magnetotelluric (MT) survey, integrated with reprocessed seismic reflection profiles, across the supergiant Timmins‐Porcupine gold camp of the Abitibi greenstone belt (AGB) was conducted to investigate the architecture of cru…
View article: Characterizing some major Archean faults at depth in the Superior craton, North America
Characterizing some major Archean faults at depth in the Superior craton, North America Open
The geometry of ancient faults at depth can only be mapped by high-resolution geophysical surveys such as seismic reflection profiling. Recent deep (35–48 km) reflection profiles acquired across the Archean southern Superior craton of Nort…
View article: Crustal conductivity footprint of the orogenic gold district in the Red Lake greenstone belt, western Superior craton, Canada
Crustal conductivity footprint of the orogenic gold district in the Red Lake greenstone belt, western Superior craton, Canada Open
A magnetotelluric (MT) study across the Red Lake greenstone belt of the western Superior craton, Canada, images a 50-km-long north-dipping conductor (<20 Ω·m) at 20–25 km depth and subvertical conductors spatially correlated with crusta…
View article: Why Deep-Water Eruptions Are So Different From Subaerial Eruptions
Why Deep-Water Eruptions Are So Different From Subaerial Eruptions Open
Magmas erupted in deep-water environments (>500 m) are subject to physical constraints very different to those for subaerial eruptions, including hydrostatic pressure, bulk modulus, thermal conductivity, heat capacity and the density of wa…
View article: Understanding the initiation and development of explosive Plinian eruptions: the conduit processes, eruption dynamics and dispersal processes of the ignimbrite and caldera-forming Lower Pumice 1 (184 ka) and Lower Pumice 2 (172 ka) eruptions, Santorini Caldera, Greece
Understanding the initiation and development of explosive Plinian eruptions: the conduit processes, eruption dynamics and dispersal processes of the ignimbrite and caldera-forming Lower Pumice 1 (184 ka) and Lower Pumice 2 (172 ka) eruptions, Santorini Caldera, Greece Open
In this thesis, the internal stratigraphy, facies, and facies architecture of the rhyodacitic 184 ka Lower Pumice 1 (LP1) and 172 ka Lower Pumice 2 (LP2) eruption sequences, erupted from Santorini Caldera, Greece, are reassessed as the bas…