Basement reactivation in a sub‐Andean foreland flexural bulge: The Pantanal wetland, SW Brazil

Ussami, Naomi; Shiraiwa, Shozo; Domínguez, José Maria Landim

doi:10.1029/1998tc900004

Cited by 121 publications

(100 citation statements)

References 36 publications

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“…The 150,000 km 2 Pantanal plain region of centralwestern Brazil is one of the world's largest freshwater wetlands which was formed approximately 2.5 million years ago between the upper Pliocene and lower Pleistocene by the westward migration and compression of the Brazilian shield by the uplift of the Central Andes (Ussami et al, 1999). Topographically, the Pantanal is from 80 to 200 m above sea level with a low inclination gradient of about 1-2 cm km -1 from north to south and 6 to 8 cm km -1 from east to west.…”

Section: Study Area and Samplingmentioning

confidence: 99%

Demographic history of wood stork (Mycteria americana) Brazilian Pantanal colonies revealed by mitochondrial DNA analysis

et al. 2006

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We used mitochondrial DNA (mtDNA) sequences to investigate the demographic history of the wood stork (Mycteria americana) populations in the Brazilian Pantanal. Sequences of 390/460 bp fragment of the mtDNA control region were analyzed in 62 wood stork specimens from 8 colonies using neutrality tests, phylogeographic, and coalescent analyses. Population expansion was supported by the significantly negative values of Tajima's (D = -2.071) and Fu's (Fs = -14.544) statistics and the unimodal pattern of mismatch distribution. Nested clade analyses indicated a historic range expansion event and recurrent gene flow that was restricted by isolation by distance as explanations for the haplotype distribution among the sampled colonies. High genetic diversity and the strictly unidirectional gene flow pattern emphasized the conservation importance of preserving the southern Pantanal colonies. Coalescence analyses suggested that northern and southern colonies diverged approximately 6,250 years before the present (YBP), and that their most recent common ancestor was approximately 18,900 YBP. Our results suggest that the contemporary wood stork Pantanal population originated from a more geographically limited founder population. Potential source populations may have occurred in the southern Pantanal or ancestry may reside in populations inhabiting the Brazilian central plateau or areas closer to the equatorial region.

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Section: Study Area and Samplingmentioning

confidence: 99%

Demographic history of wood stork (Mycteria americana) Brazilian Pantanal colonies revealed by mitochondrial DNA analysis

et al. 2006

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“…Tectonics is another factor that was probably significant in the genesis of carbonates in the Pantanal region. This is suggested by the direct association between the carbonate deposits and tectonic structures, normal faults and folds originated in the Brasiliano tectonic cycle, in the Neoproterozoic (Almeida et al 2000), and reactivated with the Andean orogeny and the subsidence of the Pantanal (Ussami et al 1999). The tectonic activity could have modified the relief, generating scarps and depressed areas, which controlled the location of rivers and lakes.…”

Section: Factors Controlling the Continental Carbonates Genesis And Ementioning

confidence: 99%

Paleoenvironmental Evolution of Continental Carbonates in West-Central Brazil

Oliveira

Rossetti

Utida

2017

An. Acad. Bras. Ciênc.

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This paper presents a sedimentological and stratigraphical study of Quaternary (Middle to Late Pleistocene/ Holocene) continental carbonates outcrops inside Pantanal Basin and its surroundings, especially in Serra da Bodoquena, Pantanal do Miranda and Corumbá/Ladário plateau, in the state of Mato Grosso do Sul, as well as in Serra das Araras, in the state of Mato Grosso. The aim is to understand the depositional paleoenvironments and analyse climate and tectonic influences in their genesis and evolution. The results show that the deposition of these continental carbonates started in the Middle to Late Pleistocene and have continued, with some interruptions, until the present days. Sedimentary successions were identified in the different areas, without complete correlation. Two sedimentary successions separated by an erosional surface were described in Serra da Bodoquena and Serra das Araras. In Corumbá and Pantanal do Miranda, only one succession was described. These successions were deposited in elongated lakes parallel to fault planes; small lakes, related plains and plateaus; springs related to cliffs produced by faulting; rivers conditioned by topographic variation. The climatic interpretation, without proper temporal resolution, obtained by the stable-isotope composition and stratigraphic interpretation, indicates alternation of dry and wet periods. The Neoproterozoic faults with their neotectonics and the subsidence of the Pantanal Basin, are the major control for carbonated water flow and development of depositional areas, gradually turning plateaus into slight tilted areas, allowing the evolution of depositional systems from lakes to rivers.

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“…1). It is located in the Pantanal Basin (Almeida 1945), an inland tectonic depression that originated from tectonic interactions between the South American and Nazca Plates during the Late Tertiary (Assumpção 1998, Ussami et al 1999. This basin has been filled by several alluvial fans, generating quaternary sediments dominated by quartzose sands, with maximum thickness of approxi- 1100 mm, lower than the annual evapo-transpiration rate of 1400 mm (Por 1995).…”

Section: Introductionmentioning

confidence: 99%

Biogeochemical processes and the diversity of Nhecolândia lakes, Brazil

Almeida

Calijuri

Falco

et al. 2011

An. Acad. Bras. Ciênc.

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The Pantanal of Nhecolândia, the world's largest and most diversified field of tropical lakes, comprises approximately 10,000 lakes, which cover an area of 24,000 km 2 and vary greatly in salinity, pH, alkalinity, colour, physiography and biological activity. The hyposaline lakes have variable pHs, low alkalinity, macrophytes and low phytoplankton densities. The saline lakes have pHs above 9 or 10, high alkalinity, a high density of phytoplankton and sand beaches. The cause of the diversity of these lakes has been an open question, which we have addressed in our research. Here we propose a hybrid process, both geochemical and biological, as the main cause, including (1) a climate with an important water deficit and poverty in Ca 2+ in both superficial and phreatic waters; and (2) an elevation of pH during cyanobacteria blooms. These two aspects destabilise the general tendency of Earth's surface waters towards a neutral pH. This imbalance results in an increase in the pH and dissolution of previously precipitated amorphous silica and quartzose sand. During extreme droughts, amorphous silica precipitates in the inter-granular spaces of the lake bottom sediment, increasing the isolation of the lake from the phreatic level. This paper discusses this biogeochemical problem in the light of physicochemical, chemical, altimetric and phytoplankton data.

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Basement reactivation in a sub‐Andean foreland flexural bulge: The Pantanal wetland, SW Brazil

Cited by 121 publications

References 36 publications

Demographic history of wood stork (Mycteria americana) Brazilian Pantanal colonies revealed by mitochondrial DNA analysis

Demographic history of wood stork (Mycteria americana) Brazilian Pantanal colonies revealed by mitochondrial DNA analysis

Paleoenvironmental Evolution of Continental Carbonates in West-Central Brazil

Biogeochemical processes and the diversity of Nhecolândia lakes, Brazil

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