Early Miocene paleoclimate in southern Patagonia inferred from fossil woods

Ruiz, Daniela; Pujana, Roberto R.; Brea, Mariana

doi:10.1016/j.revpalbo.2021.104429

Cited by 3 publications

(2 citation statements)

References 61 publications

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“…Other boundary conditions include precipitation rate and global SL history. The precipitation rate is set at 1,500 mm/yr for the humid subtropical climate between 23 and 16.5 Ma (Marshall et al, 1984;Ruiz et al, 2021;Trayler et al, 2020), decreasing to 800 mm/yr between 16.5 and 12 Ma and to 200 mm/yr from 12 Ma to present due to the rain shadow effect (cf., Blisniuk et al, 2005). We use the global sea level curve of Haq et al (1987) (Figure 1), which exhibits a first-order ∼50 m rise and >100 m fall superimposed with second-order fluctuations during the Neogene.…”

Section: Model Setupmentioning

confidence: 99%

Mechanisms of Subsidence and Uplift of Southern Patagonia and Offshore Basins During Slab Window Formation

Ding

Dávila

Lithgow‐Bertelloni

2023

Geochem Geophys Geosyst

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Subduction of bathymetric anomalies (e.g., an active ridge) can alter the morphology of subducted slabs and their coupling to surface processes. A natural laboratory to study these effects is the subduction of the Oceanic Chilean Ridge beneath the South American plate, which led to the formation of the Patagonian slab window. Its formation and subsequent northward migration contributed to the regression of Patagoniense sea and exhumation of marine strata to their present elevation. To date, there is no quantitative analysis of the effects on the sediment routing system of the slab window. We modeled the Neogene topographic change and foreland sedimentary evolution from the Andean Cordillera to Atlantic margin. Our results show that subcrustal‐driven subsidence correlated with accelerated subduction of the Nazca plate is required to explain the timing of the Patagonian transgression and thickness and spatial extent of marine beds during the incursion. In other words, traditional mechanisms, such as foreland flexure and global sea‐level rise, are insufficient. The subsequent regression and accumulation of mid‐Miocene alluvial‐fluvial deposits were associated with the growth of the Cordillera and a possible flattening of Nazca subduction in the middle Miocene. Isostatic uplift of ∼1 km due to lithospheric thinning during slab window formation can explain the foreland exhumation, sediment bypass, and increases in the offshore sedimentation rate. However, spatial‐temporal varying dynamic uplift is required to explain the along‐strike variations in foreland sedimentation. Our study provides new insights into the interplay between slab window formation, crustal deformation, and landscape evolution.

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Section: Model Setupmentioning

confidence: 99%

Mechanisms of Subsidence and Uplift of Southern Patagonia and Offshore Basins During Slab Window Formation

Ding

Dávila

Lithgow‐Bertelloni

2023

Geochem Geophys Geosyst

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“…This type of fossil plant is essential to reconstruct the past flora and the canopy composition of the forests of the past. In addition, based on detailed studies of the woods, inferences about the paleoclimate (e.g., Ruiz et al 2021) are made.…”

Section: Introductionmentioning

confidence: 99%

Fossil woods from Argentina (1884–2021)

Pujana

2022

MACN

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Argentinean fossil woods have been studied since the end of the XIX century and numerous publications have dealt with this type of fossil. A database of 324 records including fossil woods from the Carboniferous to the Pleistocene found in Argentina (including Malvinas/Falkland Islands) was built. The publications about fossil wood records through 134 years (1884-2021) can be divided into three periods, i) publications by non-Argentine researchers , ii) sporadic publications by researchers from Argentina (1941Argentina ( -1999, and iii) frequent publications by researchers from Argentina (2000Argentina ( -2021. The database has updated information (i.e., age, synonyms, repository). Most of the records are gymnosperms (57 %, including among others, conifer-like woods, cycads, pteridosperms, and corystosperms), and the remaining are angiosperm woods (43 %). The latter appeared in the Cretaceous and are dominant in the Cenozoic, reflecting the worldwide expansion of angiosperms since the Cretaceous. The majority of the records are from Patagonia, and Cretaceous-Cenozoic. The trend indicates that many more articles dealing with fossil woods will be published in the next years.

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