Radiocarbon Age Offsets Between Living Organisms from the Marine and Continental Reservoir in Coastal Localities of Patagonia (Argentina)

Cordero, Roberto; Panarello, Héctor O.; Lanzelotti, Sonia Laura; Dubois, Cristian Mario Favier

doi:10.1017/s0033822200032343

Cited by 28 publications

(16 citation statements)

References 12 publications

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“…The magnitude of the offset calculated for La Olla 1 (783 ± 55 14 C yr) compares well with 2 offsets measured by Cordero et al (2003) at the nearest localities: Punta Norte (566 ± 80 14 C yr) and Golfo San José (surficial water; 856 ± 105 14 C yr). The La Olla 1 offset is also in the same range as a reservoir effect of 620 ± 140 14 C yr measured by Albero et al (1986) for the mid-Holocene at the Beagle Channel, Tierra del Fuego Island.…”

Section: Macrophytessupporting

confidence: 76%

“…Along the southern Atlantic coast, the magnitude of the modern marine reservoir effect varies considerably. Nadal de Masi (2001), Eastoe et al (2002), and Angulo et al (2005) measured reservoir ages at the southern and southeastern Brazilian coast, ranging from about 300 to 700 14 C yr. For the Atlantic coast of Patagonia, 14 C offsets range from about 80 to 1100 14 C yr (Cordero et al 2003).…”

Section: Macrophytesmentioning

confidence: 99%

“…Few studies have been carried out to estimate the carbon reservoir effect associated with terrestrial and freshwater mollusks from the Pampean region (Figini et al 1985(Figini et al , 1995, while the marine reservoir effect has been assessed at different sites along the southwest Atlantic coast: southern Brazil (Nadal de Masi 2001; Eastoe et al 2002;Angulo et al 2005), Patagonia (Cordero et al 2003), and Tierra del Fuego (Albero et al 1986).…”

Section: Introductionmentioning

confidence: 99%

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Radiocarbon Chronologies of Holocene Lacustrine Sediments from the Southern Coast of Buenos Aires Province, Argentina

Fontana¹

2007

Radiocarbon

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Two lacustrine sediment sequences, La Olla 1 and Laguna del Sauce Grande, on the southern coast of Buenos Aires Province, Argentina, were investigated for carbon reservoir effects, which may influence age-depth chronologies. Fruits of the submerged macrophyte Ruppia cf. maritima from the La Olla 1 sequence, and gastropod shells of Heleobia parchappii from the Laguna del Sauce Grande core, were radiocarbon dated. In addition, terrestrial plant remains and shells of living specimens were dated to assess the presence and magnitude of a reservoir effect. A reservoir age of about 800 14C yr is estimated for the aquatic plant samples of La Olla 1 for the early Holocene. The reservoir effect is attributed to the in wash of 14C-deficient bicarbonate from the surrounding sand dunes. The decay of marine organisms and salt spray are likely the main sources of 14C-deficient carbon. The magnitude of the reservoir effect is consistent with marine reservoir offsets reported for the region. The 14C measurements on shells of living and fossil specimens of Heleobia parchappii indicate the absence of a reservoir effect at Laguna del Sauce Grande, which may be due to the large size and shallow nature of the lake. This study shows how the reservoir ages of 2 close-by lakes in very similar geological settings can be largely different. These results have significant implications for the interpretation of 14C dates from lacustrine deposits in the region.

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Section: Macrophytessupporting

confidence: 76%

Section: Macrophytesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Radiocarbon Chronologies of Holocene Lacustrine Sediments from the Southern Coast of Buenos Aires Province, Argentina

Fontana¹

2007

Radiocarbon

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“…In fact, all the conventional 14 C results from carbonates in WHC2 older than 2600 conventional radiocarbon years appear systematically offset from the two wood samples at 78 and 154 cm (Table ). This suggests a different ∆ R in the lower part of the core (gray carbonate mud) impacted the benthic invertebrates (foraminifera and ostracods), perhaps in response to greater upwelling of saline groundwater through the carbonate, a process observed elsewhere [ Gili et al ., ; Moore et al ., ; Cordero et al ., ; Sabatier et al ., ]. In the upper part of WHC2, however, the carbonate sample from 28 to 30 cm is ~130 years older than the wood sample slightly deeper at 33 to 33.5 cm (Table ).…”

Section: Methodsmentioning

confidence: 98%

Low‐frequency storminess signal at Bermuda linked to cooling events in the North Atlantic region

et al. 2015

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North Atlantic climate archives provide evidence for increased storm activity during the Little Ice Age (150 to 600 calibrated years (cal years) B.P.) and centered at 1700 and 3000 cal years B.P., typically in centennial-scale sedimentary records. Meteorological (tropical versus extratropical storms) and climate forcings of this signal remain poorly understood, although variability in the North Atlantic Oscillation (NAO) or Atlantic Meridional Overturning Circulation (AMOC) are frequently hypothesized to be involved. Here we present records of late Holocene storminess and coastal temperature change from a Bermudian submarine cave that is hydrographically circulated with the coastal ocean. Thermal variability in the cave is documented by stable oxygen isotope values of cave benthic foraminifera, which document a close linkage between regional temperature change and NAO phasing during the late Holocene. However, erosion of terrestrial sediment into the submarine cave provides a "storminess signal" that correlates with higher-latitude storminess archives and broader North Atlantic cooling events. Understanding the driver of this storminess signal will require higher-resolution storm records to disentangle the contribution of tropical versus extratropical cyclones and a better understanding of cyclone activity during hemispheric cooling periods. Most importantly, however, the signal in Bermuda appears more closely correlated with proxy-based evidence for subtle AMOC reductions than NAO phasing.

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“…The continental Patagonian coast, which is more than 3000 km long, shows a significant variability in ΔR values. This was highlighted by 20 modern shell-plant pairs collected from northern Patagonia to Tierra del Fuego showing 14 C age offsets from 80 to 1100 yr (Cordero et al 2003). We also note that Gomez et al (2008) measured large values of ΔR from the Quequén River estuary, as well as on the coast of Mar del Plata and Punta Mogotes in Buenos Aires Province.…”

Section: Final Remarksmentioning

confidence: 98%

Marine Reservoir Effect Values from Shell-Middens of San Matías Gulf, Northern Patagonia (Argentina): A 5000-yr Record

Dubois

Jull

2017

Radiocarbon

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Ten marine reservoir effect (R) values were obtained from archaeological shell-middens along the San Matías Gulf, North Patagonian Atlantic coast, Argentina. They were determined by accelerator mass spectrometry (AMS) measurements on marine shell (Mytilidae) and charcoal samples (burned, short-lived plants) derived from a common stratigraphic unit. The R values fluctuate between 205±48 and 358±56 14C yr BP from ca. 5300 to ca. 700 14C yr BP with no obvious temporal trend. Calculated ΔR values fluctuate between +30±66 and –162±48 yr during the same time span. Local factors such as restricted connection with the open sea or presence of aged carbonates do not appear to have had an influence on this effect along the gulf coastline. The mean R value obtained (266 ± 51 yr) constitutes a useful value for correcting ages in shells from abundant archaeological deposits recorded in the area since Middle Holocene times.

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Radiocarbon Age Offsets Between Living Organisms from the Marine and Continental Reservoir in Coastal Localities of Patagonia (Argentina)

Cited by 28 publications

References 12 publications

Radiocarbon Chronologies of Holocene Lacustrine Sediments from the Southern Coast of Buenos Aires Province, Argentina

Radiocarbon Chronologies of Holocene Lacustrine Sediments from the Southern Coast of Buenos Aires Province, Argentina

Low‐frequency storminess signal at Bermuda linked to cooling events in the North Atlantic region

Marine Reservoir Effect Values from Shell-Middens of San Matías Gulf, Northern Patagonia (Argentina): A 5000-yr Record

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