scholarly journals An Interpretation of Late Quaternary Glacial Flow Indicators in the Baie des Chaleurs Region, Northern New Brunswick

2007 ◽  
Vol 43 (2) ◽  
pp. 179-190 ◽  
Author(s):  
A. G. Pronk ◽  
P. T. Bobrowsky ◽  
M. A. Parkhill
Keyword(s):  
New Brunswick ◽  
Late Quaternary ◽  
Ice Sheet ◽  
Field Research ◽  
Published Data ◽  
Second Phase ◽  
Sedimentary Deposits ◽  
The North ◽  
Third Phase ◽  
Late Wisconsinan

ABSTRACT A sequence of late Quaternary geologic events in northern New Brunswick is determined from striation analysis derived from published data, open file reports, and field research conducted by the authors since 1985. These data are integrated with clast provenance and clast fabric trend analysis, as well as information from other studies in the surrounding area. South of the Baie des Chaleurs, a complicated Late Wisconsinan glacial history is preserved in the form of erosive features including nailhead striae, miniature crag-and-tails, and various scars, striations, and fractures. The rarity of sedimentary deposits and datable materials precludes simple stratigraphie interpretation. Based on over 1,000 striation sites, we conclude four major phases of glacial flow affected the area during the Late Wisconsinan: 1) an early flow to the southeast which reflects local Appalachian ice; 2) a second phase of glacial flow to the east indicating a Laurentide ice influence in western New Brunswick; 3) a third phase of glacial flow to the north-northeast, which may represent ice response to drawdown in the Baie des Chaleurs; and 4) a final multidirectional flow indicating localized ice response during the last stages of Late Wisconsinan glaciation. The absence of Canadian Shield erratics in northern New Brunswick is explained in terms of ice streaming along the St. Lawrence channel beneath a southward-flowing Laurentide Ice Sheet. Basal ice debris (including Shield erratics) was apparently truncated and removed by the obliquely flowing ice stream, leaving relatively clean ice in the Ice Sheet as it entered Gaspésie and ultimately New Brunswick.

Harvest of Briars

2019 ◽  
pp. 121-158
Author(s):  
A. Wess Mitchell
Keyword(s):  
Eighteenth Century ◽  
Ottoman Empire ◽  
Cost Effective ◽  
Balkan Peninsula ◽  
The Black Sea ◽  
Second Phase ◽  
Habsburg Monarchy ◽  
The West ◽  
The North ◽  
Third Phase

This chapter examines the competition with the Ottoman Empire and Russia, from the reconquest of Hungary to Joseph II’s final Turkish war. On its southern and eastern frontiers, the Habsburg Monarchy contended with two large land empires: a decaying Ottoman Empire, and a rising Russia determined to extend its influence on the Black Sea littorals and Balkan Peninsula. In balancing these forces, Austria faced two interrelated dangers: the possibility of Russia filling Ottoman power vacuums that Austria itself could not fill, and the potential for crises here, if improperly managed, to fetter Austria’s options for handling graver threats in the west. In dealing with these challenges, Austria deployed a range of tools over the course of the eighteenth century. In the first phase (1690s–1730s), it deployed mobile field armies to alleviate Turkish pressure on the Habsburg heartland before the arrival of significant Russian influence. In the second phase (1740s–70s), Austria used appeasement and militarized borders to ensure quiet in the south while focusing on the life-or-death struggles with Frederick the Great. In the third phase (1770s–90s), it used alliances of restraint to check and keep pace with Russian expansion, and recruit its help in comanaging problems to the north. Together, these techniques provided for a slow but largely effective recessional, in which the House of Austria used cost-effective methods to manage Turkish decline and avoid collisions that would have complicated its more important western struggles.

Late Tertiary to late Quaternary record in the Mackenzie Mountains, Northwest Territories, Canada: stratigraphy, paleosols, paleomagnetism, and chlorine - 36

1996 ◽  
Vol 33 (6) ◽  
pp. 875-895 ◽  
Author(s):  
A. Duk-Rodkin ◽  
R. W. Barendregt ◽  
C. Tarnocai ◽  
F. M. Phillips
Keyword(s):  
Late Quaternary ◽  
Ice Sheet ◽  
Climatic Conditions ◽  
Unconsolidated Sediments ◽  
Laurentide Ice Sheet ◽  
Stratigraphic Sequence ◽  
Late Tertiary ◽  
Mackenzie Mountains ◽  
Late Wisconsinan ◽  
Stratigraphic Succession

A stratigraphic sequence of unconsolidated sediments ranging in age from Late Pliocene to Late Pleistocene is recorded in the Canyon Ranges of the Mackenzie Mountains. Three of the sections (Katherine Creek, Little Bear River, and Inlin Brook) expose bedrock and Tertiary gravel overlain by colluvium and a multiple till sequence of montane origin, separated by paleosols and capped by a till of Laurentide origin. The sections are correlated on the basis of lithology, paleosol development, paleomagnetism, and chlorine dating of surface boulder erratics. A formal stratigraphic nomenclature is proposed for the deposits of this region. The sequence of glacial tills separated by paleosols reflects a long record of glacial–interglacial cycles. Soil properties from the oldest paleosol to modern soil show a general decrease in the degree of soil development, suggesting a progressive deterioration of interglacial climatic conditions. A normal–reverse–normal sequence of remanent magnetization was determined within the stratigraphic succession and assigned to the Gauss–Matuyama–Brunhes chrons, respectively. A Gauss age was assigned to the basal colluvium, an early Matuyama age (including Olduvai) to the first two tills, and a Brunhes age to the last three tills. Laurentide deposits are of Late Wisconsinan age and are restricted to the uppermost part of the stratigraphic succession. Chlorine dates for surface boulders place the all-time limit of the Laurentide Ice Sheet at about 30 ka. The Late Wisconsinan Laurentide Ice Sheet was the only continental ice to reach the Mackenzie and Richardson mountains of the northern Cordillera.

A reconstruction of glacial events in southeastern New Brunswick

1991 ◽  
Vol 28 (10) ◽  
pp. 1594-1612 ◽  
Author(s):  
Marc Foisy ◽  
Gilbert Prichonnet
Keyword(s):  
New Brunswick ◽  
Ice Flow ◽  
Ice Cap ◽  
The North ◽  
Lithostratigraphic Units ◽  
Glaciofluvial Deposits ◽  
Southern Border ◽  
Late Wisconsinan ◽  
Radial Outflow ◽  
North And South

Sedimentological and petrographical data obtained from five sections located north and south of the Caledonian Highlands in southeastern New Brunswick demonstrate the existence of three main till units and one glaciofluvial unit, which have been grouped in four distinct lithostratigraphic units. The lower till was deposited by a glacier that overrode the Caledonian Highlands from northwest to southeast and advanced as far as Nova Scotia during Middle(?) to Late Wisconsinan times. The overlying middle till from the north provides evidence that ice continued to advance across the Highlands from northwest toward southeast and then was partially overwhelmed by another glacier that was advancing southwest along the southern border of the Highlands: this glacier deposited a coeval middle till. During Late Wisconsinan deglaciation, ice separated into two masses: a residual ice cap with radial outflow from the Highlands; and a lobe in the Chignecto Bay, retreating toward the northeast. The existence of a plateau ice cap is demonstrated by the presence of till and glaciofluvial deposits in the upper part of all surveyed sections, and is supported by the sequence of ice flow patterns recorded by striae and the centrifugal distribution of meltwater flow indicators. The weak development of soils, the fresh appearance of till and morainic landforms, and the lack of periglacial features throughout the area, especially on the Highlands, all favour the interpretation that the Caledonian Highlands were not a nunatak during the glacial maximum of the Late Wisconsinan Substage.

Late Quaternary Iceberg Rafting along the Antarctic Peninsula Continental Rise and in the Weddell and Scotia Seas

2001 ◽  
Vol 56 (3) ◽  
pp. 308-321 ◽  
Author(s):  
Colm Ó Cofaigh ◽  
Julian A. Dowdeswell ◽  
Carol J. Pudsey
Keyword(s):  
Antarctic Peninsula ◽  
Late Quaternary ◽  
Sediment Cores ◽  
Regional Scale ◽  
Ice Sheet ◽  
Glacial Cycles ◽  
Continental Rise ◽  
The North ◽  
Glacial Periods ◽  
The Antarctic

AbstractSediment cores from the continental rise west of the Antarctic Peninsula and the northern Weddell and Scotia Seas were investigated for their ice-rafted debris (IRD) content by lithofacies logging and counting of particles >0.2 cm from core x-radiographs. The objective of the study was to determine if there are iceberg-rafted units similar to the Heinrich layers of the North Atlantic that might record periodic, widespread catastrophic collapse of basins within the Antarctic Ice Sheet during the Quaternary. Cores from the Antarctic Peninsula margin contain prominent IRD-rich units, with maximum IRD concentrations in oxygen isotope stages 1, 5, and 7. However, the greater concentration of IRD in interglacial stages is the result of low sedimentation rates and current winnowing, rather than regional-scale episodes of increased iceberg rafting. This is also supported by markedly lower mass accumulation rates (MAR) during interglacial periods versus glacial periods. Furthermore, thinner IRD layers within isotope stages 2–4 and 6 cannot be correlated between individual cores along the margin. This implies that the ice sheet over the Antarctic Peninsula did not undergo widespread catastrophic collapse along its western margin during the late Quaternary (isotope stages 1–7). Sediment cores from the Weddell and Scotia Seas are characterized by low IRD concentrations throughout, and the IRD signal generally appears to be of limited regional significance with few strong peaks that can be correlated between cores. Tentatively, this argues against pervasive, rapid ice-sheet collapse around the Weddell embayment over the last few glacial cycles.

The Magnitude and Proximate Cause of Ice-Sheet Growth Since 35,000 yr B.P.

2001 ◽  
Vol 56 (3) ◽  
pp. 299-307 ◽  
Author(s):  
Isaac J. Winograd
Keyword(s):  
North Atlantic ◽  
Ice Sheet ◽  
Proximate Cause ◽  
Ice Volume ◽  
The North ◽  
Data Compilation ◽  
Sst Warming ◽  
Late Wisconsinan ◽  
The Last Glacial Maximum ◽  
The Last Glacial

AbstractThe magnitude of late Wisconsinan (post-35,000 yr B.P.) ice-sheet growth in the Northern Hemisphere is not well known. Ice volume at ∼35,000 yr B.P. may have been as little as 20% or as much as 70% of the volume present at the last glacial maximum (LGM). A conservative evaluation of glacial–geologic, sea level, and benthic δ18O data indicates that ice volume at ∼35,000 yr B.P. was approximately 50% of that extant at the LGM (∼20,000 yr B.P.); that is, it doubled in about 15,000 yr. On the basis of literature for the North Atlantic and a sea-surface temperature (SST) data compilation, it appears that this rapid growth may have been forced by low-to-mid-latitude SST warming in both the Atlantic and Pacific Oceans, with attendant increased moisture transport to high latitudes. The SST ice-sheet growth notion also explains the apparent synchroneity of late Wisconsinan mountain glaciation in both hemispheres.

Heinrich event-0 (DC-0) in sediment cores from the northwest Labrador Sea: recording events in Cumberland Sound?

1998 ◽  
Vol 35 (5) ◽  
pp. 510-519 ◽  
Author(s):  
Matthew E Kirby
Keyword(s):  
Sediment Cores ◽  
Ice Sheet ◽  
Transport Processes ◽  
Labrador Sea ◽  
Sediment Layer ◽  
Strong Constraint ◽  
The North ◽  
Cumberland Sound ◽  
Late Wisconsinan ◽  
Detrital Carbonate

Layers of ice-rafted, limestone debris rich sediment were deposited in the northwest Labrador Sea and the North Atlantic during the last glacial period (10-80 ka); these sediments were deposited by Heinrich events (H), events which record catastrophic collapses of the Laurentide Ice Sheet in the region of the Hudson Strait. These intervals of detrital carbonate rich sediments are referred to as detrital carbonate layers (DC) in the northwest Labrador Sea. Accelerator mass spectrometry (AMS) 14C dates provide a strong constraint on the timing for these events; H-1 = DC-1 and H-2 = DC-2. DC-0, also known as H-0, correlative to the Younger Dryas cooling event, is not as distinct a sediment unit in the northwest Labrador Sea as DC-1 and DC-2. An analysis of sediments from two cores (HU75009-IV-055 and HU75009-IV-056) off the mouth of the Hudson Strait in the northwest Labrador Sea basin sheds new light on the "missing" DC-0 sediment unit. Timing for the DC-0 event in cores 055 and 056 is bracketed between 11.3 ka ± 105 years and 10.4 ka ± 185 years based on AMS 14C dates. Sedimentology of the DC-0 unit reveals a sediment layer rich in ice-rafted debris with an increase in percentage of dolomite (representative material <2 mm), clay-size dolomite, and kaolinite; it is significantly different from DC-1 and DC-2 in the same analyzed cores. For example, the percent carbonate increase in DC-1 and DC-2 is approximately three to four times higher than that in DC-0. In addition, DC-1 and DC-2 show clear evidence for mass sediment transport processes which are not observed in DC-0. From these data, the DC-0 sediment unit in the northwest Labrador Sea records Cumberland Sound ice margin change and, for reasons addressed in this paper, the Hudson Strait does not play a major role in the deposition of DC-0 sediments at these core sites. Provenance indicators, such as kaolinite and dolomite, from the core study sediments corroborate this hypothesis. These results provide strong evidence for Cumberland Sound ice margin activity and sediment contribution during DC events, specifically DC-0, and additional evidence for multiple and synchronous ice margin change along the eastern Laurentide ice margin during the Late Wisconsinan, thus further supporting an atmospheric forcing mechanism for Late Wisconsinan ice sheet change.

scholarly journals The Development of Urban to Support Sport Tourism in Qatar, A Case Study: West Bay North Beach

2021 ◽  
Author(s):  
Mohamed Ali ◽  
Georges Jabbour ◽  
Mahfoud Amara
Keyword(s):  
Second Phase ◽  
Tourist Attraction ◽  
Sport Tourism ◽  
World Cup ◽  
The North ◽  
Third Phase ◽  
Arabic And English ◽  
Travel Industry ◽  
Mega Event ◽  
North Beach

Sports the travel industry is recognized as movement that includes either watching or taking part in a game while staying outside of the sightseers' typical environmental factors. Major games, like the football, Olympic Games and rugby competitions, have developed into solid the travel industry attracts and of themselves, contributing altogether to the host objective's travel industry profile. Major Sports event and tourism are intertwined and mutually beneficial. Qatar has host many of mega sport event and next year will host FIFA World Cup 2022. Urban regeneration is one of the benefits of mega event in Qatar. The purpose of this study is to analyze West Bay North Beach Project development that has been launched in April 2021. A total of 15 Arabic and English press content were collected from different websites. • 12 beaches operate by hotels in one area. • Project contains three phases: First phase includes open beach number 7 to beach number 12, which are now open. • Second phase contains beaches number 1 to 3 and beach number 6 and will be open in second quartiles of 2021. Third phase includes beaches number 4 and 5, and it will be available in 2023. • Length of two-kilometer cycle path. • Walkway of 1.5 km length and 8 meters width. • Access public transit across 36 stations, with buses running every 12 minutes from 6 a.m. to 9 p.m. The North Beach Project in West Bay is planned to become a major new sport tourist attraction. An exceptional tourist attraction in Doha Downtown by building up a interconnected organization of the general population and business exercises, associating it to the encompassing regions through open transportation, person on foot ways, and cycling paths from the Corniche to Lusail. The limitation of the study is a few information has been published about the project.

Ice-flow patterns and glacial transport in the eastern Hudson Bay region: implications for the late Quaternary dynamics of the Laurentide Ice Sheet

1995 ◽  
Vol 32 (12) ◽  
pp. 2057-2070 ◽  
Author(s):  
Michel Parent ◽  
Serge J. Paradis ◽  
Éric Boisvert
Keyword(s):  
Compositional Data ◽  
Late Quaternary ◽  
Regional Distribution ◽  
Ice Sheet ◽  
Glacial Maximum ◽  
Laurentide Ice Sheet ◽  
Hudson Bay ◽  
Ice Flow ◽  
Flow Phase ◽  
Late Wisconsinan

Recent field surveys in the eastern Hudson Bay region have led to the discovery of regional ice-flow sequences that require a significant reassessment of the late Quaternary dynamics of the Laurentide Ice Sheet. Two regional ice-flow phases can be recognized from till compositional data and from crosscutting relationships observed on striated bedrock surfaces: the oldest is directed toward the northwest and north-northwest, while the youngest is directed toward the west and includes a late-glacial deflection toward the southwest. The wide regional distribution of striae formed during the early northwestward glacial movement together with the recognition of palimpsest glacial dispersal trains associated with this phase suggest that it was a long-lived, time-transgressive regional event. The ensuing glacial movement is a regionally dominant westward ice-flow phase during which several large glacial dispersal trains were formed downglacier from distinctive bedrock sources. The largest of these trains extends westward over a distance of 120 km from Lac à l'Eau Claire to Hudson Bay. Regional glacial transport data as well as glacial and deglacial landforms indicate that this was a long-lived glacial phase, likely lasting throughout the Late Wisconsinan glacial maximum and until déglaciation about 8000 BP. The erosional and depositional record of the northwestward ice-flow event is quite comparable to that of the ensuing glacial phase, and it is thus thought to represent the Early Wisconsinan glacial maximum. In view of the large regional extent of the northwestward ice-flow phase, it must postdate the early buildup of the ice sheet. Along the southeastern Hudson Bay coast, the Late Wisconsinan westward glacial movement was followed by a southwestward deflection that was likely caused by glacial streaming prior to 8000 BP in James Bay, in response to calving and surging into Glacial Lake Ojibway.

Quaternary stratigraphy and history, Williams Lake, British Columbia

1987 ◽  
Vol 24 (1) ◽  
pp. 147-158 ◽  
Author(s):  
John J. Clague
Keyword(s):  
British Columbia ◽  
Late Quaternary ◽  
Ice Sheet ◽  
Stream Channels ◽  
Valley Fill ◽  
Braided Streams ◽  
History Of ◽  
Late Wisconsinan ◽  
Cordilleran Ice Sheet ◽  
Sand And Gravel

Thick valley-fill sediments in the vicinity of Williams Lake, British Columbia, provide a detailed record of the late Quaternary history of an area near the centre of the former Cordilleran Ice Sheet. Stratigraphic units assigned to the late Wisconsinan Fraser Glaciation, the preceding (penultimate) glaciation, and the present interglaciation are described. Especially noteworthy are (1) thick units of sand and gravel deposited by braided streams, perhaps during periods of ice-sheet growth; and (2) complex glaciolacustrine sediments that accumulated in ice-dammed lakes during periods of deglaciation.Glaciers from the Coast and Cariboo mountains coalesced and flowed north over central British Columbia during late Wisconsinan time. Fraser Glaciation advance sediments and older Pleistocene deposits were partially removed by this ice sheet, and the eroded remnants were mantled with till. At the end of the Fraser Glaciation, the Cordilleran Ice Sheet downwasted and retreated southward along an irregular front across the study area. Parts of the ice sheet stagnated and disintegrated into tongues confined to valleys. Sediment carried by melt streams flowing from decaying ice masses was deposited in glacial lakes, in stream channels, and on floodplains.

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