New radiocarbon dates for early deglaciation from the southeastern Coast Mountains of British Columbia

1989 ◽  
Vol 26 (10) ◽  
pp. 2169-2171 ◽  
Author(s):  
Catherine Souch
Keyword(s):  
British Columbia ◽  
Organic Material ◽  
Lacustrine Sediments ◽  
Southern Coast ◽  
Radiocarbon Dates ◽  
Coast Mountains ◽  
Southeastern Coast ◽  
Creek Watershed

Basal dates obtained on organic material from postglacial lacustrine sediments from four lakes in the Kwoiek Creek watershed, southern Coast Mountains of British Columbia, provide minimum dates of deglaciation. The dates obtained (12 255 ± 770, 11 485 ± 185, 10 385 ± 595, and 9640 ± 380 BP), at elevations 835–1120 m, suggest that extensive areas of the mountains of southern British Columbia were ice free prior to 11 500 years ago. This has implications for models of the regional deglaciation of the southern portion of the province.

Neoglaciation in the southern Coast Mountains of British Columbia: chronology prior to the late Neoglacial maximum

1986 ◽  
Vol 23 (3) ◽  
pp. 273-287 ◽  
Author(s):  
J. M. Ryder ◽  
B. Thomson
Keyword(s):  
British Columbia ◽  
Early Holocene ◽  
Southern Coast ◽  
Radiocarbon Dates ◽  
Coast Mountains ◽  
Glacier Fluctuations ◽  
Related Information ◽  
Eighteenth And Nineteenth Centuries

Moraine stratigraphy and morphology, radiocarbon dates from Klinaklini, Franklin, Tiedemann, Gilbert, and Bridge glaciers, and related information from elsewhere in the Coast Mountains are used to construct a chronology for glacier fluctuations. The Garibaldi phase of glacier expansion, 6000–5000 14C years BP, at the end of the early Holocene xerothermic interval, is indicated by overridden tree stumps. The mid-Neoglacial Tiedemann advance, 3300–1900 14C years BP, is represented by moraines, till, and meltwater sediments at three glaciers, but only Tiedemann Glacier attained its greatest Holocene extent at this time. Late Neoglacial expansion commenced before 900 14C years BP and continued without notable interruption until glaciers achieved their maximum post-Pleistocene expansion during the eighteenth and nineteenth centuries. Evidence for the Garibaldi and Tiedemann events is scarce within the Coast Mountains because of the more extensive late Neoglacial advance. However, correlative advances have been recognized in adjacent mountains within British Columbia, Washington, and Alaska.

U-PB GEOCHRONOLOGY AND ZIRCON HF AND O ISOTOPE ANALYSIS OF PLUTONS OF THE SOUTHERN COAST MOUNTAINS BATHOLITH, BRITISH COLUMBIA: INSIGHT INTO EPISODIC MAGMATISM IN CONTINENTAL ARCS

2017 ◽  
Author(s):  
Emily C. Homan ◽  
◽  
M. Robinson Cecil ◽  
George E. Gehrels ◽  
Margaret E. Rusmore ◽  
...  
Keyword(s):  
British Columbia ◽  
Isotope Analysis ◽  
Southern Coast ◽  
Coast Mountains ◽  
Continental Arcs ◽  
O Isotope ◽  
Insight Into

Bridge River tephra: revised distribution and significance for detecting old carbon errors in radiocarbon dates of limnic sediments in southern British Columbia

1980 ◽  
Vol 17 (11) ◽  
pp. 1454-1461 ◽  
Author(s):  
Rolf W. Mathewes ◽  
John A. Westgate
Keyword(s):  
British Columbia ◽  
Sedimentary Rocks ◽  
Lacustrine Sediments ◽  
Igneous Rocks ◽  
The South ◽  
Radiocarbon Dates ◽  
Carbon Contamination ◽  
Horseshoe Lake ◽  
Tephra Beds

Ash-grade Bridge River tephra, identified as such on the basis of shard habit, modal mineralogy, and composition of ilmenite, occurs in sedimentary cores from three lakes located to the south of the previously documented plume and necessitates a significant enlargement of the fallout area of that tephra in southwestern British Columbia.These new, more southerly occurrences are probably equivalent to the ~2350 year old Bridge River tephra, although it can be argued from the evidence at hand that the 14C dates and biotite-rich nature support relationship to a slightly earlier Bridge River event.Large differences exist in the 14C age of sediments immediately adjacent to the Bridge River tephra at these three lake sites; maximum ages of 3950 ± 170 years BP (GX-5549) and 3750 ± 210 years BP (I-10041) were obtained at Phair and Fishblue lakes, respectively, whereas the corresponding age at Horseshoe Lake is only 2685 ± 180 years BP (GX-5757). The two older dates are considered to be significantly affected by old carbon contamination for the bedrock locally consists of calcareous sedimentary rocks and the lacustrine sediments are very calcareous. The 14C date from Horseshoe Lake, which occurs in an area of igneous rocks, appears to be only slightly too old relative to the ~2350 year old Bridge River tephra.Well-dated tephra beds, therefore, can be very useful in assessing the magnitude of old carbon errors associated with radiocarbon dates based on limnic sediments. Calcareous gyttja deposits beneath Bridge River tephra within the study area exhibit old carbon errors of the order of 1350–1550 years.

Glacier fluctuations during the past millennium in Garibaldi Provincial Park, southern Coast Mountains, British Columbia

2007 ◽  
Vol 44 (9) ◽  
pp. 1215-1233 ◽  
Author(s):  
Johannes Koch ◽  
John J Clague ◽  
Gerald D Osborn
Keyword(s):  
British Columbia ◽  
Little Ice Age ◽  
Ice Age ◽  
Southern Coast ◽  
Coast Mountains ◽  
The Past ◽  
Glacier Fluctuations ◽  
Garibaldi Provincial Park ◽  
Provincial Park ◽  
Past Millennium

The Little Ice Age glacier history in Garibaldi Provincial Park (southern Coast Mountains, British Columbia) was reconstructed using geomorphic mapping, radiocarbon ages on fossil wood in glacier forefields, dendrochronology, and lichenometry. The Little Ice Age began in the 11th century. Glaciers reached their first maximum of the past millennium in the 12th century. They were only slightly more extensive than today in the 13th century, but advanced at least twice in the 14th and 15th centuries to near their maximum Little Ice Age positions. Glaciers probably fluctuated around these advanced positions from the 15th century to the beginning of the 18th century. They achieved their greatest extent between A.D. 1690 and 1720. Moraines were deposited at positions beyond present-day ice limits throughout the 19th and early 20th centuries. Glacier fluctuations appear to be synchronous throughout Garibaldi Park. This chronology agrees well with similar records from other mountain ranges and with reconstructed Northern Hemisphere temperature series, indicating global forcing of glacier fluctuations in the past millennium. It also corresponds with sunspot minima, indicating that solar irradiance plays an important role in late Holocene climate change.

A debris flow triggered by the breaching of a moraine-dammed lake, Klattasine Creek, British Columbia

1985 ◽  
Vol 22 (10) ◽  
pp. 1492-1502 ◽  
Author(s):  
John J. Clague ◽  
S. G. Evans ◽  
Iain G. Blown
Keyword(s):  
British Columbia ◽  
Debris Flow ◽  
Debris Flows ◽  
Southern Coast ◽  
Coast Mountains ◽  
Debris Avalanches ◽  
Unconsolidated Sediment ◽  
Sudden Release ◽  
Dammed Lake ◽  
Unusual Origin

A very large debris flow of unusual origin occurred in the basin of Klattasine Creek (southern Coast Mountains, British Columbia) between June 1971 and September 1973. The flow was triggered by the sudden release of up to 1.7 × 106 m3 of water from a moraine-dammed lake at the head of a tributary of Klattasine Creek. Water escaping from the lake mobilized large quantities of unconsolidated sediment in the valley below and thus produced a debris flow that travelled in one or, more likely, several surges 8 km downvalley on an average gradient of 10° to the mouth of the stream. Here, the flow deposited a sheet of coarse bouldery debris up to about 20 m thick, which temporarily blocked Homathko River. Slumps, slides, and debris avalanches occurred on the walls of the valley both during and in years following the debris flow. Several secondary debris flows of relatively small size have swept down Klattasine Creek in the 12–14 years since Klattasine Lake drained.

Multi-proxy record of Holocene glacial history of the Spearhead and Fitzsimmons ranges, southern Coast Mountains, British Columbia

2007 ◽  
Vol 26 (3-4) ◽  
pp. 479-493 ◽  
Author(s):  
Gerald Osborn ◽  
Brian Menounos ◽  
Johannes Koch ◽  
John J. Clague ◽  
Vanessa Vallis
Keyword(s):  
British Columbia ◽  
Southern Coast ◽  
Glacial History ◽  
Proxy Record ◽  
Coast Mountains ◽  
History Of

Interdecadal patterns of total sediment yield from a montane catchment, southern Coast Mountains, British Columbia, Canada

Geomorphology ◽  
2010 ◽  
Vol 118 (1-2) ◽  
pp. 207-212 ◽  
Author(s):  
Erik Schiefer ◽  
Marwan A. Hassan ◽  
Brian Menounos ◽  
Channa P. Pelpola ◽  
Olav Slaymaker
Keyword(s):  
British Columbia ◽  
Sediment Yield ◽  
Southern Coast ◽  
Coast Mountains ◽  
Total Sediment

Early Holocene climate at Castle Peak, southern Coast Mountains, British Columbia, Canada

1992 ◽  
Vol 95 (1-2) ◽  
pp. 153-167 ◽  
Author(s):  
John J. Clague ◽  
R.W. Mathewes ◽  
W.M. Buhay ◽  
T.W.D. Edwards
Keyword(s):  
British Columbia ◽  
Early Holocene ◽  
Southern Coast ◽  
Holocene Climate ◽  
Coast Mountains

scholarly journals Pollen evidence of Late Holocene treeline fluctuation from the southern Coast Mountains, British Columbia

2002 ◽  
Vol 51 (1) ◽  
pp. 81-92 ◽  
Author(s):  
Martin Evans
Keyword(s):  
British Columbia ◽  
Organic Matter Content ◽  
Matter Content ◽  
Southern Coast ◽  
Coast Mountains ◽  
Alpine Glacier ◽  
The Core ◽  
Surface Samples ◽  
Summer Temperatures ◽  
Glacier Advance

Abstract Palynological records of Holocene climate change in the southern Coast Mountains identify the Neoglacial period, subsequent to 6 600 BP, as cooler and wetter than the preceding Hypsithermal. However, geomorphic evidence of alpine glacier advance suggests that there were three distinct cooler/wetter periods during the Neoglacial. By careful selection of a sensitive alpine site this study has enabled the recognition of two of these stages in a palynological record of Neoglacial climate. Pollen spectra, conifer needle macrofossils, organic matter content, and magnetic susceptibility were assessed for a continuous sequence of sediment from Blowdown Lake, which has a basal date older than 4 000 BP. Comparison of the Picea/Pinus pollen ratios from the core with modern surface samples suggests that treeline was at least 100 m above its present elevation until 3 400 BP, indicating that summer temperatures were at least 0.7 ° C above the present. Treeline declined to near present levels by around 2 400 BP. Two subsequent periods of lower treeline were identified which appear to correlate approximately with the Tiedemann and Late Neoglacial periods of glacier advance in southwestern British Columbia. Differences between Picea/Pinus and Abies/Pinus ratios from the core are consistent with the autecology of the species. This suggests that the sensitivity of the pollen ratio approach to reconstructing treeline is dependent on the ratios selected.

Sign in / Sign up

Export Citation Format

Share Document