Search Results - "Porritt, Lucy A."

Kimberlite ascent by assimilation-fuelled buoyancy by Russell, James K., Porritt, Lucy A., Lavallée, Yan, Dingwell, Donald B.

“…Assimilation of mantle minerals is proposed as a cause of deep-seated exsolution of dissolved volatiles and the driver of kimberlite magma ascent. What gives…”
Get full text

Pyroclastic passage zones in glaciovolcanic sequences by Russell, James K., Edwards, Benjamin R., Porritt, Lucy A.

“…Volcanoes are increasingly recognized as agents and recorders of global climate variability, although deciphering the linkages between planetary climate and…”
Get full text

The influence of complex intra- and extra-vent processes on facies characteristics of the Koala Kimberlite, NWT, Canada: volcanology, sedimentology and intrusive processes by Porritt, Lucy A., Cas, Ray A. F.

“…The Koala kimberlite, Northwest Territories, Canada, is a small pipe-like body that was emplaced into the Archean Koala granodiorite batholith and the…”
Get full text

Textural analysis of strongly altered kimberlite; examples from the Ekati diamond mine, Northwest Territories, Canada by Porritt, Lucy A, Cas, Ray A. F, Schaefer, Bruce, McKnight, Stafford W

“…Two massive, poorly sorted pyroclastic kimberlite deposits from the Fox and Koala pipes at the Ekati diamond mine, Northwest Territories, Canada present…”
Get full text

The influence of volcanological and sedimentological processes on diamond grade distribution in kimberlites: examples from the EKATI Diamond Mine, NWT, Canada by Porritt, Lucy A., Cas, R. A. F., Ailleres, L., Oshust, P.

“…The distribution of diamonds within individual kimberlite pipes is poorly documented in the public domain due to the proprietary nature of the data. The study…”
Get full text

Englacial lake dynamics within a Pleistocene cordilleran ice sheet at Kima' Kho tuya (British Columbia, Canada) by Russell, James K., Edwards, Benjamin R., Turnbull, Marie, Porritt, Lucy A.

“…Passage zones are stratigraphic surfaces found in littoral settings separating deposits diagnostic of subaqueous environments from overlying sequences of…”
Get full text

Explosive glaciovolcanism at Cracked Mountain Volcano, Garibaldi Volcanic Belt, Canada by Harris, Martin A., Russell, James K., Barendregt, Rene, Porritt, Lucy A., Wilson, Alexander

“…Cracked Mountain (CM) is a basaltic volcano within the northern extension of the Cascade volcanic arc into southwest, British Columbia, Canada (i.e. Garibaldi…”
Get full text

Thermomechanical milling of accessory lithics in volcanic conduits by Campbell, Michelle E., Russell, James K., Porritt, Lucy A.

“…Accessory lithic clasts recovered from pyroclastic deposits commonly result from the failure of conduit wall rocks, and represent an underutilized resource for…”
Get full text

The exposed Mule Creek vent deposits record the structure of a volcanic conduit during a hybrid explosive–effusive eruption by Unwin, Holly E., Tuffen, Hugh, Wadsworth, Fabian B., Phillips, Emrys R., James, Mike R., Foster, Annabelle, Kolzenburg, Stephan, Castro, Jonathan M., Porritt, Lucy A.

“…Silicic volcanic eruptions commonly begin with the explosive ejection of pyroclastic material, before transitioning to gentler effusion-dominated activity…”
Get full text

A new approach to kimberlite facies terminology using a revised general approach to the nomenclature of all volcanic rocks and deposits: Descriptive to genetic by Cas, Ray, Porritt, Lucy, Pittari, Adrian, Hayman, Pat

“…Although kimberlite pipes/bodies are usually the remains of volcanic vents, in-vent deposits, and subvolcanic intrusions, the terminology used for kimberlite…”
Get full text

Geochemical trends in kimberlites of the Ekati property, Northwest Territories, Canada: Insights on volcanic and resedimentation processes by Nowicki, Tom, Porritt, Lucy, Crawford, Barbara, Kjarsgaard, Bruce

“…The Ekati property, Northwest Territories, Canada, hosts in excess of 150 volcanic kimberlite pipes occupied by a wide variety of rock types including…”
Get full text

Some major problems with existing models and terminology associated with kimberlite pipes from a volcanological perspective, and some suggestions by Cas, R.A.F., Hayman, P., Pittari, A., Porritt, L.

“…Five significant problems hinder advances in understanding of the volcanology of kimberlites: (1) kimberlite geology is very model driven; (2) a highly genetic…”
Get full text

In-vent column collapse as an alternative model for massive volcaniclastic kimberlite emplacement: An example from the Fox kimberlite, Ekati Diamond Mine, NWT, Canada by Porritt, L.A., Cas, R.A.F., Crawford, B.B.

“…The origins of massive, poorly sorted fragmental kimberlite and kimberlite breccias in the diatremes of kimberlite volcanic pipes is currently poorly…”
Get full text