scholarly journals Mantle Xenoliths from the Nikos kimberlites on Somerset Island, and the Zulu kimberlites on Brodeur Peninsula, Baffin Island, Canada

2019 ◽  
Keyword(s):  
Mantle Xenoliths ◽  
Baffin Island ◽  
Somerset Island

Diving behaviour of narwhals (Monodon monoceros) at two coastal localities in the Canadian High Arctic

2002 ◽  
Vol 80 (4) ◽  
pp. 624-635 ◽  
Author(s):  
Kristin L Laidre ◽  
Mads Peter Heide-Jørgensen ◽  
Rune Dietz
Keyword(s):  
Strong Relationship ◽  
High Arctic ◽  
Dive Depth ◽  
Baffin Island ◽  
Correction Factors ◽  
Canadian High Arctic ◽  
Suction Cup ◽  
Monodon Monoceros ◽  
Somerset Island ◽  
Good Agreement

In August 1999 and 2000, four suction-cup-attached time–depth recorders (TDRs) were deployed and retrieved from narwhals (Monodon monoceros) in Tremblay Sound, Baffin Island, and Creswell Bay, Somerset Island, Nunavut, Canada. The TDRs remained on the whales for between 12 and 33 h and collected 64.5 h of dive data. Mean dive depths ranged from 20.8 m (SD = 14.8 m) to 50.8 m (SD = 43.8 m) and mean dive durations ranged from 3.4 min (SD = 1.6 min) to 4.9 min (SD = 4.5 min). There appeared to be individual differences in dive parameters both within a region and between regions. Three of the whales made short, shallow dives, while another whale made dives twice as deep and twice as long. One whale had maximum dive durations (>20 min) that exceeded predicted aerobic dive limits for narwhals. There was a strong relationship between maximum dive depth and duration for all whales (p < 0.0001). Narwhals spent between 30.3 and 52.9% of their time at depths <5 m and the range of correction factors for availability bias was 1.9–3.3. Satellite-linked TDRs were simultaneously deployed on the whales at both localities. Dive data collected using the two methods were compared and good agreement between the methods was obtained.

Sr-Nd-Pb isotope systematics of mantle xenoliths from Somerset Island kimberlites

2001 ◽  
Vol 65 (22) ◽  
pp. 4243-4255 ◽  
Author(s):  
S.S. Schmidberger ◽  
A. Simonetti ◽  
D. Francis
Keyword(s):  
Mantle Xenoliths ◽  
Pb Isotope ◽  
Somerset Island ◽  
Isotope Systematics

On the distribution and biology of an arctic fairy shrimp Artemiopsis stefanssoni Johansen, 1921 (Crustacea: Anostraca)

1977 ◽  
Vol 55 (2) ◽  
pp. 280-287 ◽  
Author(s):  
Graham R. Daborn
Keyword(s):  
Body Size ◽  
Food Availability ◽  
Egg Production ◽  
Fairy Shrimp ◽  
Baffin Island ◽  
Egg Predation ◽  
Genital Opening ◽  
Somerset Island ◽  
Artemiopsis Stefanssoni ◽  
Branchinecta Paludosa

The distribution of Artemiopsis stefanssoni is described. Samples from eight localities in Baffin Island and Somerset Island were analysed and showed wide variations between populations in body size and egg production. These variations probably correspond to variations in food availability. Maximum lengths recorded were 9.00 mm for males and 11.95 mm for females. The egg sac of this species has no genital opening. Successive clutches are retained within the egg sac instead of being released after fertilisation and deposition of the tertiary shell. Egg sacs contained up to 120 eggs, whereas maximum ovary output was 40 eggs per clutch. It is suggested that retention of eggs within the egg sac affords protection against egg predation by benthic feeders such as Branchinecta paludosa and Lepidurus arcticus.

δ13C stratigraphy of the Proterozoic Bylot Supergroup, Baffin Island, Canada: implications for regional lithostratigraphic correlations

1999 ◽  
Vol 36 (3) ◽  
pp. 313-332 ◽  
Author(s):  
Linda C Kah ◽  
Anne G Sherman ◽  
Guy M Narbonne ◽  
Andrew H Knoll ◽  
Alan J Kaufman
Keyword(s):  
Carbon Isotope ◽  
Record Values ◽  
Time Correlation ◽  
Published Data ◽  
Baffin Island ◽  
Isotopic Data ◽  
Carbon Isotopic ◽  
Somerset Island ◽  
Interval Comparison

The Bylot Supergroup, northern Baffin Island, contains >1500 m of platform, shelf, and slope carbonates deposited between ~ 1270 and ~ 723 Ma. Limited chronostratigraphic data have led to the broad correlation of the Bylot Supergroup with predominantly Neoproterozoic successions in northern and western Laurentia; yet, detailed correlation has been impossible given biostratigraphic and lithostratigraphic limitations. Carbon-isotope chemostratigraphy represents a potential dataset to constrain such interregional correlations. Carbon isotopic data from the Bylot Supergroup and broadly coeval successions from Somerset Island and northwest Greenland reveal distinct stratigraphic trends in δ13C, with intervals of moderate 13C enrichment (+3.5 ± 1‰) punctuated by excursions to slightly negative values (-1.0 ± 1‰). Although the scale of the observed variation is muted relative to Neoproterozoic standards, the dissimilarity of values to those recorded in northwestern Laurentia suggests that these strata delineate a discrete depositional interval. Comparison of isotopic values with published data indicates that δ13C values between approximately -1.0 and +4.0‰ are characteristic of the interval between ~ 1300 and ~ 800 Ma. This pattern is distinct from that of younger Neoproterozoic successions, which typically record values >+5‰, and older Mesoproterozoic successions, which record values near 0‰, and suggests that these moderately positive values may be useful for broad time correlation. Compilation of new and published data permits the tentative reconstruction of a global Mesoproterozoic carbon isotopic curve.

Gem hornblende from Baffin Island, NWT, Canada

1986 ◽  
Vol 20 (2) ◽  
pp. 100-107
Author(s):  
Willow Wight
Keyword(s):  
Baffin Island

Mantle xenoliths from Tertiary lavas and dykes on Ubekendt Ejland, West Greenland

1998 ◽  
pp. 152-154
Author(s):  
Stefan Bernstein ◽  
C. Kent Brooks
Keyword(s):  
Field Work ◽  
Mantle Xenoliths ◽  
Alkaline Basalt ◽  
Basalt Flow ◽  
Volcanic Province ◽  
East Greenland ◽  
Original Series ◽  
West Greenland ◽  
Ultramafic Xenoliths ◽  
Extensive Collection

NOTE: This article was published in a former series of GEUS Bulletin. Please use the original series name when citing this article, for example: Bernstein, S., & Brooks, C. K. (1998). Mantle xenoliths from Tertiary lavas and dykes on Ubekendt Ejland, West Greenland. Geology of Greenland Survey Bulletin, 180, 152-154. https://doi.org/10.34194/ggub.v180.5099 _______________ Mantle xenoliths were found in Tertiary alkaline (basanitic) lavas on Ubekendt Ejland in West Greenland in the mid 1970s by J.G. Larsen. Microprobe analyses of olivine, pyroxene and spinel in two mantle xenoliths, suggested that the xenoliths on Ubekendt Ejland are highly depleted and have high modal olivine contents, and low modal orthopyroxene and clinopyroxene (Larsen 1982). In this respect the mantle xenoliths from Ubekendt Ejland are very similar to the spinel harzburgites from Wiedemann Fjord, in the Tertiary volcanic province of East Greenland (Brooks & Rucklidge 1973; Bernstein et al. 1998). Larsen (1981) also reported dykes containing mantle nodules and a varied suite of cumulates and megacrysts, one of which has subsequently been dated to 34.1 ± 0.2 Ma (Storey et al. 1998) The basalt flow that carries the xenoliths is from what is defined as the Erqua Formation which occurs at the top of the lava succession in western Ubekendt Ejland (Fig. 1; Drever & Game 1948; Larsen 1977a, b). The basalts have not been dated, but are younger than 52.5 Ma, which is the date obtained for the underlying formation (Storey et al. 1998). During July 1997, we spent three weeks collecting xenoliths and prospecting for xenolith-bearing dykes in the Uummannaq district of central West Greenland. The field work resulted in an extensive collection of xenoliths from an alkaline basalt flow described by Larsen (1977a, b), as well as the discovery of a dyke carrying a large number of ultramafic xenoliths of various origins. 

ORGANIC MATTER PRESERVATION IN CHERT: MESOPROTEROZOIC ANGMAAT FORMATION, BAFFIN ISLAND, CANADA

2017 ◽  
Author(s):  
Ashley R. Manning-Berg ◽  
◽  
Michael L. Tuite ◽  
Kenneth H. Williford ◽  
Linda C. Kah
Keyword(s):  
Organic Matter ◽  
Baffin Island
Sign in / Sign up

Export Citation Format

Share Document