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gyttja

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Series: GSA Field Guide
Published: 10 December 2018
DOI: 10.1130/2018.0051(10)
EISBN: 9780813756516
... of silt with few organics; a middle unit, composed of organic-rich gyttja, ~5 m thick; and an upper 5-m-thick layer of sedge-rich, peaty gyttja. Nine radiocarbon ages obtained from this core provide a basis for estimating sediment accumulation rates ( Table 1 ; Fig. 5 ). An abrupt change in sediment...
FIGURES | View All (8)
Journal Article
Journal: Geology
Published: 01 January 2011
Geology (2011) 39 (1): 75–78.
... (Trettetjønn, 810 masl, 60°43′N, 7°00′E). The lakes are all relatively small (area/volume: <0.25 km 2 /<2 × 10 6 m 3 ) and vary in depth from 0.5 to 12 m. The Holocene sediment sequences all consist of gyttja with an organic matter content ranging from 5% to 50%; mean values are between 20% and 40...
FIGURES
Journal Article
Journal: Geology
Published: 01 October 2007
Geology (2007) 35 (10): 915–918.
... was affected by ancient Maya land use from before ca. 1000 B.C. to A.D. 900. This period of human impact coincided with deposition in the lake of a detrital unit (Maya Clay) as much as 7 m thick that contrasts sharply with the relatively organic-rich gyttja deposited both before and after Maya occupation...
FIGURES
Journal Article
Published: 01 February 2003
Environmental and Engineering Geoscience (2003) 9 (2): 99–115.
... of British Columbia. Cores collected from Stump Lake span the last 11,500 years and consist largely of gyttja. However, a diamicton layer and an associated detrital organic layer, which is capped by a clay lamina, record a large debris flow derived from the headwaters of Cheekye basin. Radiocarbon ages...
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Journal Article
Journal: Geology
Published: 01 August 2002
Geology (2002) 30 (8): 723–726.
... from a high-elevation cirque, reached glacial-age debris and recovered ∼6 m of lake clays overlain by gyttja. Accelerator mass spectrometry dating, sedimentology, variations in magnetic properties, and organic carbon data reveal six distinct periods of glacial and/or periglacial activity. These include...
FIGURES
Journal Article
Journal: GSA Bulletin
Published: 01 June 2000
GSA Bulletin (2000) 112 (6): 943–958.
... relatively deep-water conditions in Lake Agassiz. Overlying this is a spatially and temporally variable mixture of silt, sand, peat, gyttja, and marl, containing an allochthonous assemblage of siliceous microfossils and plant macrofossils with a wide range of radiocarbon dates. These sediments were deposited...
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Journal Article
Published: 01 June 1996
Canadian Journal of Earth Sciences (1996) 33 (6): 928–937.
...Alexander P. Wolfe Abstract An interval of late-glacial to early Holocene sedimentation, spanning the period 12.9–8.4 ka BP ( 14 C dated by accelerator mass spectrometry), is contained within 15 cm of gyttja in a core from a small lake on southwestern Cumberland Peninsula, Baffin Island...
Journal Article
Published: 01 December 1991
Canadian Journal of Earth Sciences (1991) 28 (12): 1965–1974.
Journal Article
Published: 01 October 1991
Canadian Journal of Earth Sciences (1991) 28 (10): 1583–1593.
Journal Article
Published: 01 September 1991
Canadian Journal of Earth Sciences (1991) 28 (9): 1349–1352.
...Ronald Doig Abstract The magnitude 6.3 Timiskaming earthquake of 1935 resulted in discoloration in small lakes in the epicentral region. Sonar profiles for Lac Tee have shown that organic-rich gyttja has been removed from the sides and redeposited in the deep parts of the lake. Lake sediment cores...
Journal Article
Published: 01 October 1990
Canadian Journal of Earth Sciences (1990) 27 (10): 1330–1338.
...Robert W. Dalrymple; John S. Carey Abstract The modern sediments in the Cataraqui River lagoon and marsh (Kingston, Ontario) consist of mixtures of organic material and clayey silts, the organic content of which increases as water depth decreases; gyttjas are accumulating in the deeper water parts...
Journal Article
Published: 01 August 1988
Canadian Journal of Earth Sciences (1988) 25 (8): 1175–1183.
...—marsh; gyttja—wet marsh and very shallow (deltaic) lagoon; and brown and grey clay—open-water lagoon. This entire sequence accumulated over the last 4200 years under slowly deepening, transgressive conditions caused by the isostatic rise of the lake outlet. Land clearing by European settlers...
Journal Article
Published: 01 October 1983
Canadian Journal of Earth Sciences (1983) 20 (10): 1536–1542.
Journal Article
Published: 01 November 1982
Canadian Journal of Earth Sciences (1982) 19 (11): 2114–2125.
... in sedimentary aluminum, iron, potassium, titanium, and strontium soon after settlement, coinciding with declines in carbon, nitrogen, and sulfur. A corresponding shift from a highly organic gyttja to a silt- and clay-rich sediment also confirms the increased input up to the present day of inorganic sediment...
Journal Article
Published: 01 July 1981
Canadian Journal of Earth Sciences (1981) 18 (7): 1228–1239.
Journal Article
Published: 01 August 1980
Canadian Journal of Earth Sciences (1980) 17 (8): 1087–1095.
... fully-developed seeds. This date on cones (in gyttja) provides an estimate of minimum age for the lower boundary of the spruce pollen zone in southern Ontario. Silty clay beneath the gyttja yielded leaves of Dryas integrifolia and pollen assemblages (a herb pollen zone) that indicate presence of a dwarf...
Journal Article
Published: 01 June 1979
Journal of the Geological Society (1979) 136 (3): 383–388.
... gyttja are interpreted as reliable records of ancient geomagnetic field changes. Comparison with 4 other British limnic palaeomagnetic sites indicates that systematic errors in C l4 age determinations have been caused in many of the sites by inwash of old soils and peats. The inwash effect is suggested...
Journal Article
Published: 01 May 1975
Canadian Journal of Earth Sciences (1975) 12 (5): 745–756.
..., ranging from basal clays to gyttjas, began about 11 500 y B.P. Three distinct pollen assemblage zones are distinguished, reflecting in part the main climatic conditions for the intervals. The oldest zone, with high percentages of pine ( Pinus ) and alder ( Alnus ) pollen, suggests cool and moist...
Journal Article
Journal: GSA Bulletin
Published: 01 December 1966
GSA Bulletin (1966) 77 (12): 1333–1337.