Late Quaternary molluscan assemblages from the coastal area of Bahía Bustamante (Patagonia, Argentina): Paleoecology and paleoenvironments

Aguirre, Marina Laura; Sirch, Yamila Negro; Richiano, Sebastián

doi:10.1016/j.jsames.2005.05.006

Cited by 42 publications

(46 citation statements)

References 30 publications

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“…Both embayments extend over a~320 km long stretch of coast. The coastal deposits present in this area have been described extensively in the literature (Feruglio, 1950;Rutter et al, 1989;Schellmann and Radtke, 1997;Rostami et al, 2000;Schellmann and Radtke, 2000;Aguirre et al, 2005Aguirre et al, ,2006Sauer et al, 2007). We concentrated our field work in the northern and southern part of the Bahía Camarones (Cabo Raso, Camarones, Caleta Pedro) and in the southern part of Bahía Bustamante (Gravina, Aristizabal peninsulas) where paleo-shores are rocky (Table 2).…”

Section: Zone 2: "Dos Bahías"mentioning

confidence: 95%

“…A major problem persists however, in the question of whether or not there exists any marine terraces correlated to MIS 7. For example, in Bahía Bustamante at least two beach ridges have been correlated to MIS 7 (Schellmann and Radtke, 2000;Aguirre et al, 2005) whereas Rostami et al (2000) proposed that MIS 7 was i) reoccupied by the MIS 5e terrace, ii) lower than the MIS 5e terrace (i.e. their respective elevations are~11 m for MIS 7 and 17 m for MIS 5e).…”

Section: Previous Studies On Coastal Deposits and Morphologiesmentioning

confidence: 99%

“…About a century later, Feruglio (1933Feruglio ( , 1950 presented the first comprehensive description and concluded that the marine origin of the terraces described by Darwin (especially the highest) was not fully proven due to some confusion with alluvial or structural terraces. For the last 25 years, studies focused on dating and correlating the terraces (Codignotto, 1983;Rutter et al, 1989Rutter et al, , 1990Codignotto et al, 1992;Schellmann and Radtke, 1997, 2000, describing Holocene coastal development (González Bonorino et al, 1999;Vilas et al, 1999), determining paleoenvironments through malacofaunal studies (Aguirre, 2003;Aguirre et al, 2005Aguirre et al, , 2006Aguirre et al, , 2009 and pedology (Sauer et al, 2007).…”

Section: Introductionmentioning

confidence: 99%

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Uplift of quaternary shorelines in eastern Patagonia: Darwin revisited

et al. 2011

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During his journey on the Beagle, Darwin observed the uniformity in the elevation of coastal Eastern Patagonia along more than 2000 km. More than one century later, the sequences of Quaternary shorelines of eastern Patagonia have been described and their deposits dated but not yet interpreted in terms of geodynamics. Consequently, we i) mapped the repartition of the Quaternary coastal sequences in Argentinean Patagonia, ii) secured accurate altitudes of shoreline angles associated with erosional morphologies (i.e. marine terraces and notches), iii) took into account previous chrono-stratigraphical interpretations in order to calculate mean uplift rates since~440 ka (MIS 11) and proposed age ranges for the higher and older features (up to~180 m), and iv) focused on the Last Interglacial Maximum terrace (MIS 5e) as the best constrained marine terrace (in terms of age and altitude) in order to use it as a tectonic benchmark to quantify uplift rates along the entire passive margin of Eastern South America. Our results show that the eastern Patagonia uplift is constant through time and twice the uplift of the rest of the South American margin. We suggest that the enhanced uplift along the eastern Patagonian coast that interested Darwin during his journey around South America on the Beagle could originate from the subduction of the Chile ridge and the associated dynamic uplift.

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Section: Zone 2: "Dos Bahías"mentioning

confidence: 95%

Section: Previous Studies On Coastal Deposits and Morphologiesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Uplift of quaternary shorelines in eastern Patagonia: Darwin revisited

et al. 2011

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“…In addition, previous paleontological data for each species was compiled from different authors (i.e., Carcelles, 1944;Feruglio, 1950;Richards and Craig, 1963;Figueiras, 1967;Herm in Osorio et al, 1983;Cionchi, 1987;Pastorino, 1989Pastorino, , 2000Gordillo, 1992;Ortlieb et al, 1991Ortlieb et al, , 1994Valdovinos, 1996;Frassinetti, 1997;del Río et al, 1998;Guzmán et al, 2000;Ortlieb et al, 2003;Aguirre, 2003;Aguirre et al, 2005Aguirre et al, , 2006Cárdenas-Mancilla and Gordillo, 2006).…”

Section: Methodsmentioning

confidence: 99%

Paleoecology and paleobiogeographic patterns of mid-Holocene mollusks from the Beagle Channel (southern Tierra del Fuego, Argentina).

Gordillo¹,

Rabassa²,

Coronato³

2008

Andgeo

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ABSTRACT. As the Beagle Channel lies between the Atlantic and the Pacific oceans, this is a critical region for the interpretation of faunal distributions in the Magellan Region. This work proposes a paleoenvironmental interpretation of the Holocene, inferred from malacological data. The development of different local benthic paleocommunities during the mid-Holocene is associated with the diversity of habitats inside this channel. The analysis of records of Venus antiqua and Ensis macha through time and their geographic links to ecological factors showed that these taxa are typical elements of the cold-temperate seas throughout the Magellan Region, showing a similar range of distribution and paleodistribution. The presence of these taxa in life position (AMS 14 C of 6,276±41 years BP) suggests that during the mid-Holocene the Beagle Channel was a path for dispersion of these taxa between the two oceans. Whether Venus antiqua and Ensis macha are Pleistocene survivors or Holocene migrants is herein discussed. In the future, integrated cross-disciplinary studies will be necessary for a better understanding of the biogeographic relationships among magellanic mollusks. RESUMEN. Paleoecología y patrones paleobiogeográficos de moluscos del Holoceno medio del Canal Beagle (sur de Tierra del Fuego, Argentina). El Canal Beagle es una región crítica para la interpretación de las distribuciones faunísticas en la Región Magallánica, ya que representa una conexión entre los océanos Atlántico y Pacífico. Sobre la base de datos malacológicos, este trabajo propone una interpretación paleoambiental para el Holoceno. El desarrollo de diferentes paleocomunidades bentónicas locales durante el Holoceno medio se asocia a la diversidad de hábitats dentro del canal. El análisis de los registros de Venus antiqua y Ensis macha a través del tiempo, y sus vínculos geográficos con factores ecológicos, indicó que estos dos taxones son elementos típicos de los mares frío-templados de la Región Magallánica, exhibiendo un patrón similar de distribución y paleodistribución. La presencia de estos taxones en posición de vida (AMS 14 C de 6,276±41 años AP) sugiere que durante el Holoceno medio el Canal Beagle constituyó una vía de dispersión de taxones entre los dos océanos. Respecto a su procedencia, se discute la factibilidad de que estos taxones sean sobrevivientes del Pleistoceno o inmigrantes del Holoceno. En el futuro, serán necesarios más estudios interdisciplinarios integrados para lograr una mejor comprensión de las relaciones faunísticas de los moluscos magallánicos.

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“…For instance, for the Argentinian coastlines, Aguirre et al (2005Aguirre et al ( , 2006 described the shift of warm water mollusks to higher latitudes on Bonaerensian coasts (south Atlantic) during the climatic optimum linked with a rise in the oceanic temperature and salinity. The effect of this period is still an open debate for southern Patagonia, although changes in sea level in Tierra del Fuego (Porter et al, 1984;Rabassa et al, 1986), as well as changes in moisture and temperature (Pendall et al, 2001;Kilian et al, 2007) have been documented.…”

Section: Taxa Composition and Paleoecologymentioning

confidence: 99%

Paleoenvironmental interpretation of late Quaternary molluscan assemblages from southern South América: A taphonomic comparison between the Strait of Magellan and the Beagle Channel

Cárdenas¹,

Gordillo²

2009

AndGeo

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ABSTRACT. This study analyzes the Holocene molluscan assemblage in raised marine terraces along the coasts of the Strait of Magellan and the Beagle Channel. A total of 33 gastropods and 12 bivalves were identifi ed. They constitute the fi rst mollusk listing for deposits in the Strait of Magellan. Taphonomic analysis suggests a high energy environment with epifaunal elements in the Strait of Magellan and a low energy environment with the predominance of infaunal elements in the Beagle Channel. All the collected species are living taxa suggesting that postglacial climatic variations were not enough to alter the composition of the communities since at least 6,000 yr BP in the southern Chile-Argentina region.

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Late Quaternary molluscan assemblages from the coastal area of Bahía Bustamante (Patagonia, Argentina): Paleoecology and paleoenvironments

Cited by 42 publications

References 30 publications

Uplift of quaternary shorelines in eastern Patagonia: Darwin revisited

Uplift of quaternary shorelines in eastern Patagonia: Darwin revisited

Paleoecology and paleobiogeographic patterns of mid-Holocene mollusks from the Beagle Channel (southern Tierra del Fuego, Argentina).

Paleoenvironmental interpretation of late Quaternary molluscan assemblages from southern South América: A taphonomic comparison between the Strait of Magellan and the Beagle Channel

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