169 research outputs found
Muehlenbachs 2
No full textDr. Karlis Muehlenbachs, University of Alberta professor and researcher in the Faculty of Earth and Atmospheric Science
Karlis Poruks - Life in Edmonton
No full textKarlis Poruks reminisces about life In Edmonton and his experiences with his granparents and parents and family friends maintenence of the Latvian heritage including speakng Latvian at home, the continuation of Latvian cultural festivals and gatherings as well as latvian handicrafts.16.1 Latvian cultural festivals and celebrations, 15.1.3 Family life in Albert
The diamonds of South Australia
No full textConference proceedings published in Lithos, 2009; 112(Suppl. 2)Abstract not availableRalf Tappert, John Foden, Thomas Stachel, Karlis Muehlenbachs, Michelle Tappert, Kevin Will
Lesins 6
No full textDr. and Mrs. Lesins with family friends, the Poruks at the University of Alberta campus farms, ca 1955. Mirdza Poruks on far left, Mrs. Irma Lesins in white, children Maija and Karlis Poruks, Dr. Karlis Lesins on right
Revealing the climate of snowball Earth from Delta O-17 systematics of hydrothermal rocks
No full textThe oxygen isotopic composition of hydrothermally altered rocks partly originates from the interacting fluid. We use the triple oxygen isotope composition (O-17/O-16, O-18/O-16) of Proterozoic rocks to reconstruct the O-18/O-16 ratio of ancient meteoric waters. Some of these waters have originated from snowball Earth glaciers and thus give insight into the climate and hydrology of these critical intervals in Earth history. For a Paleoproterozoic [similar to 2.3-2.4 gigayears ago (Ga)] snowball Earth, delta O-18 = -43 +/- 3 parts per thousand is estimated for pristine meteoric waters that precipitated at low paleo-latitudes (<= 35 degrees N). Today, such low O-18/O-16 values are only observed in central Antarctica, where long distillation trajectories in combination with low condensation temperatures promote extreme O-18 depletion. For a Neoproterozoic (similar to 0.6-0.7 Ga) snowball Earth, higher meltwater delta O-18 estimates of -21 +/- 3% imply less extreme climate conditions at similar paleolatitudes (<= 35 degrees N). Both estimates are single snapshots of ancient water samples and may not represent peak snowball Earth conditions. We demonstrate how O-17/O-16 measurements provide information beyond traditional O-18/O-16 measurements, even though all fractionation processes are purely mass dependent
Lesins 5
No full textNews clipping about Dr. Karlis Lesins, ethnic Latvian and University of Alberta cytogeneticist
Lesins 4
No full textIrma Lesins and Dr. Karlis Lesins on the University of Alberta farms. Dr. Lesins holding Maija Poruks
(Table 3) Oxygen isotopic composition and calculated equilibrium temperatures of formation of quartz-epidote pairs from DSDP Hole 504B
No full textDepth, sediment (m) is the sub-basement depth (m
(Table 4) Oxygen isotopic composition and calculated equilibrium temperatures of formation for quartz from the transition zone and dike section of DSDP Hole 504B
No full textDepth, sediment (m) is the sub-basement depth (m
(Table 1) Oxygen and carbon isotopic composition of secondary minerals from DSDP Hole 504B
No full textDepth, sediment (m) is the sub-basement depth (m
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