Santonian–Campanian continentalization in the Austral-Magallanes basin: regional correlation, provenance and geodynamic setting

Ghiglione, Matías C.; Rocha, Emilio; Raggio, Maria Fernanda; Ramos, Miguel; Ronda, Gonzalo; Paz, Damián Moyano; Varela, Augusto Nicolás; Valencia, Víctor A.

doi:10.1016/j.cretres.2021.104968

Cited by 23 publications

(16 citation statements)

References 56 publications

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“…86-80 Ma (Table 2). This places the age of the La Anita Formation between late Santonian and early Campanian, which is consistent with MDA estimates presented in previous studies (Sickmann et al, 2018;Ghiglione et al, 2021). These results are also in partial agreement with Campanian assignments of ammonite fossils from the lower La Anita Formation (Arbe and Hechem, 1984;Macellari et al, 1989;Kraemer and Riccardi, 1997;Arbe, 2002).…”

Section: Age Of the La Anita Formationsupporting

confidence: 91%

“…Basin shoaling and coeval deposition of shallowmarine deposits of the La Anita Formation occurred by ca. 86 Ma based on contemporaneous Alta Vista ash ages and the maximum depositional ages from the La Anita Formation from both this study and others (Sickmann et al, 2018;Ghiglione et al, 2021; Table 2).…”

Section: Age Of the Alta Vista Formationmentioning

confidence: 67%

“…Deposition of the Santonian-Campanian Alta Vista and Campanian Tres Pasos Formations record continued deep-marine deposition and progradation of slope clinoforms southward in the forms of deepwater channel systems and continental slope mass-transport deposits (Macellari at al., 1989;Arbe, 2002;Shultz et al, 2005;Armitage et al, 2009;Romans et al, 2009;Hubbard et al, 2010;Daniels et al, 2018;Sickmann et al, 2018;Sickmann et al, 2019). In the northern (Austral) portion of the basin, muddy continental slope facies of the Alta Vista Formation are overlain by shallow to marginal marine deposits of the Campanian La Anita Formation (Macellari et al, 1989;Arbe, 2002;Moyano Paz et al, 2018;Sickmann et al, 2018;Ghiglione et al, 2021).…”

Section: Geologic Historymentioning

confidence: 99%

“…Ammonite fossils constrain the age of the formation to Campanian (Riccardi and Rolleri, 1980), which has been extended to ca. 86-80 Ma via maximum depositional ages from detrital zircon geochronology (Sickmann et al, 2018;Sickmann et al, 2019;Ghiglione et al, 2021). Stratigraphic interpretations of the La Anita Formation suggest a wave-and fluvial-influenced delta system whose sediment was redistributed on the continental shelf via a combination of wave action and fluvio-deltaic progradation (Macellari et al, 1989;Arbe, 2002;Moyano Paz et al, 2018).…”

Section: Geologic Historymentioning

confidence: 99%

“…Further sampling of the uppermost Alta Vista and La Anita Formations is necessary to better constrain the latest depositional ages for these units. The co-appearance of deep-water conglomeratic facies from the upper Cerro Toro Formation with coarse-grained, shallow-marine deposits of the La Anita Formation may signal a synorogenic sedimentation event controlled by the progressive easterly advance of the orogenic front in the Austral and Magallanes portions of the basin (Ghiglione et al, 2021). Late Coniacian through early Santonian progradation of the Austral continental slope occurred in concert with the deposition of the deep-water Lago Sofia conglomerate, although deposition of lower Alta Vista Formation (sometimes grouped with the Cerro Toro Formation; e.g., Ghiglione et al, 2014;Sickmann et al, 2018;Sickmann et al, 2019) occurred as early as the late Turonian (ca.…”

Section: Age Correlation Between Austral and Magallanes Basin Sectorsmentioning

confidence: 99%

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Depositional Controls on Detrital Zircon Provenance: An Example From Upper Cretaceous Strata, Southern Patagonia

et al. 2022

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Understanding how depositional environments within a sedimentary system redistribute and sequester sediment is critical for interpreting basin-scale provenance trends. However, sedimentary source-to-sink models commonly examine temporal changes and do not consider how variation in sedimentation processes across a dispersal pathway may result in contrasting provenance signatures. In this paper, we demonstrate a down-paleoslope shift in detrital zircon provenance signatures correlated with shallow-marine lithofacies patterns from the Upper Cretaceous La Anita Formation and underlying continental slope lithofacies of the Alta Vista Formation (Magallanes-Austral Basin, southern Patagonia). New stratigraphic, sedimentologic, and lithofacies analysis results from the La Anita Formation suggest an upward shoaling succession, from a 1) storm-influenced shoreface, 2) fluvially dominated, wave-influenced delta, and a 3) high-energy, gravelly foreshore. Stratigraphic sections are paired with U-Pb detrital zircon sandstone samples (N = 20; n = 5,219), which provide both maximum depositional ages and provenance characteristics. While all samples contain abundant zircon derived from the Andean volcanic arc (ca. 145–75 Ma), the amount from both Jurassic distal volcanic massifs (ca. 188–162 Ma) and recycled orogenic sources exhumed during the advance of the Cretaceous fold-and-thrust belt (>200 Ma; 157–142 Ma) vary with changes in depositional environment. We argue that down-paleoslope, systematic enriching of local fold-and-thrust belt material within the La Anita Formation is reflective of progressive mixing of grains transported via shallow-marine processes, while distally enriched fluvio-deltaic transported zircons were sourced from large, regional catchments. This suggests that competition between transport processes across a shallow and marginal marine sequence of rocks affects the resulting provenance signatures recorded within a single stratigraphic succession. These data also detail the degree of sediment pathway connectivity between shallow-marine sources and deep-marine sinks. Detrital zircon results from muddy continental slope facies of the Alta Vista Formation are made up entirely locally derived material, while zircon results from deep-water, sand-rich channel facies of the Formation are indistinguishable from coeval fluvio-deltaic zircon signatures. This implies that continental shelf-to-slope connectivity in a sediment dispersal system, via submarine canyons or shelf-edge delta progradation, is necessary for detrital zircon distributions from the shallow-marine realm to propagate into the deeper marine.

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Section: Age Of the La Anita Formationsupporting

confidence: 91%

Section: Age Of the Alta Vista Formationmentioning

confidence: 67%