Lower Cretaceous ammonites from the Neuquén Basin, Argentina: Viluceras , a new Valanginian subgenus ofOlcostephanus

Aguirre-Urreta, Marı́a B.; Rawson, Peter F.

doi:10.1006/cres.1999.0154

Cited by 28 publications

(12 citation statements)

References 8 publications

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“…However, these regions show a contrasting evolution in facies behaviour and overall upward trend. Biostratigraphic scheme taken from Aguirre‐Urreta & Rawson (1997, 1999a,b), with numerical ages from Gradstein et al. (1995).…”

Section: Discussionmentioning

confidence: 99%

“…1 for location). Age of units from Leanza (1993) and Aguirre‐Urreta & Rawson (1997, 1999a,b). Time scale after Gradstein et al.…”

Section: Geological Settingmentioning

confidence: 99%

“…Details of the facies, facies associations and sequence stratigraphy are presented in Schwarz (2003) and Schwarz & Howell (2005). A refined biostratigraphic zonation based on ammonites (Aguirre‐Urreta & Rawson, 1997; Aguirre‐Urreta & Rawson, 1999 a,b) provides a well‐constrained correlation framework within the marine portion of the Mulichinco Formation spanning the measured sections (presented below), and together with key sequence‐stratigraphic surfaces help tie the four described regions.…”

Section: Sedimentology Of the Mulichinco Sequencementioning

confidence: 99%

“…The refined biostratigraphic scheme established for the Valanginian of the Neuquén Basin (Aguirre‐Urreta & Rawson, 1997, 1999a,b; Aguirre‐Urreta, 1998) was utilized in this study. Throughout the study area, the top of the Vaca Muerta Formation corresponds to the Lissonia riveroi Zone (Aguirre‐Urreta & Rawson, 1999b, Figs 5, 11, 13B and 14).…”

Section: Sedimentology Of the Mulichinco Sequencementioning

confidence: 99%

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Sedimentary response to a tectonically induced sea‐level fall in a shallow back‐arc basin: the Mulichinco Formation (Lower Cretaceous), Neuquén Basin, Argentina

Schwarz¹,

Spalletti²,

Howell

2006

Sedimentology

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This study examines the sedimentary response to a tectonically driven relative sea-level fall that occurred in the Neuquén Basin, west-central Argentina, during the late Early Valanginian (Early Cretaceous). At this time the basin lay behind the emergent Andean magmatic arc to the west. Following the relative sea-level fall, sedimentation was limited to the central part of the Neuquén Basin, with the deposition of a predominantly clastic, continental to shallow marine wedge on top of basinal black shales. This lowstand wedge is called the Mulichinco Formation and consists of a third-order sequence that lasted about 2 Myr and contains high frequency lowstand, transgressive, and highstand deposits. Significant variations in facies, depositional architecture, and internal organization of the sequence occur along depositional strike. These variations are attributed mainly to tectonic and topographic controls upon sediment flux, basin gradient, fault tilting, and shifting of the depocentre through time. These controls were ultimately related to asymmetrically distributed tectonic activity that was greater towards the magmatic arc in the west. The superposition of fluvial deposits directly upon offshore facies provides unequivocal evidence for a sequence boundary at the base of the Mulichinco Formation. However, the Mulichinco sequence boundary is marked by shallow, low erosional relief and widespread fluvial deposition. The surface lacks prominent valleys traditionally associated with sequence boundaries. This non-erosive sequence boundary geometry is attributed to the ramp-type geometry of the basin and/or rapid uplift that limited stratigraphic adjustment to base-level fall. Significant along-strike facies changes and a lowrelief sequence boundary are attributes that may be common in tectonically active, semi-enclosed basins (e.g. shallow back-arc basins, foreland basins).

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Section: Discussionmentioning

confidence: 99%

“…1 for location). Age of units from Leanza (1993) and Aguirre‐Urreta & Rawson (1997, 1999a,b). Time scale after Gradstein et al.…”

Section: Geological Settingmentioning

confidence: 99%

Section: Sedimentology Of the Mulichinco Sequencementioning

confidence: 99%

Section: Sedimentology Of the Mulichinco Sequencementioning

confidence: 99%

See 2 more Smart Citations

Sedimentary response to a tectonically induced sea‐level fall in a shallow back‐arc basin: the Mulichinco Formation (Lower Cretaceous), Neuquén Basin, Argentina

Schwarz¹,

Spalletti²,

Howell

2006

Sedimentology

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“…Over the last 15 years, Dr Beatriz Aguirre-Urreta and the writer have made detailed bed-by-bed collections from numerous sections, principally in Neuquén Province, and monographed many of the more important faunas (e.g. Aguirre-Urreta 1998; Aguirre-Urreta and Rawson 1999aRawson , 1999bRawson , 1999cRawson , 2001aRawson , 2001bRawson , 2003. Our research has established a zonal scheme for the Valanginian to early Barremian interval (Aguirre-Urreta and Rawson 1997;Aguirre-Urreta et al 2005) which provides a standard for comparison with other South American sequences.…”

Section: Introductionmentioning

confidence: 99%

Global relationships of Argentine (Neuquén Basin) Early Cretaceous ammonite faunas

Rawson

2007

Geological Journal

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Of the 16 ammonite families of Valanginian to Early Barremian age, six are represented in the Neuquén Basin-the Neocomitidae, Olcostephanidae, Oosterellidae, Holcodiscidae, Ancyloceratidae and Douvilleiceratidae. Normally, only one or two ammonite genera occur at any one level, and there were ten turnovers at family level. Each turnover marks an important immigration event and other immigrations sometimes occurred between. All the taxa are of Tethyan origin; but while some immigrants are Andean Province forms, other are taxa that for at least part of their temporal range achieved an almost pandemic distribution, even invading the marginal Boreal basins of NW Europe (North Sea and Lower Saxony basins). The Neuquén and NW European basins lay at similar palaeolatitudes south and north of the equator, and there are striking similarities between some of the immigrants to the two areas. Links between the NW European and other South American faunas suggest a possible direct marine connection between the two areas.

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The Lower Cretaceous Chañarcillo and Neuquén Andean basins: ammonoid biostratigraphy and correlations

et al. 2007

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The Chañarcillo and Neuquén basins of the Central Andes shared a common geological history in the earlier part of the Early Cretaceous but from Barremian times onward their evolution began to diverge, probably due to an increasing activity of an intervening volcanic arc. The Berriasian to Lower Barremian sequences were mainly marine and include rich ammonoid faunas, with many taxa in common to both the basins. They include both Andean and near‐pandemic forms, the latter providing some good correlation levels with the ‘standard’ Mediterranean sequence. Marine conditions persisted in the Chañarcillo Basin till Early Albian times; the associated ammonoid faunas include pandemic, Pacific and Antarctic genera. In contrast, in the Neuquén Basin evaporites and continental clastics of the Huitrín Formation mark the beginning of a long disconnection with the Pacific Ocean, though a short‐lived marine incursion is represented by the carbonates of La Tosca Member of the Huitrín Formation. The ammonoid faunas of the two basins are compared here, and a detailed biostratigraphic division of the sequences is discussed and compared with the Mediterranean succession. Copyright © 2007 John Wiley & Sons, Ltd.

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Lower Cretaceous ammonites from the Neuquén Basin, Argentina: Viluceras , a new Valanginian subgenus ofOlcostephanus

Cited by 28 publications

References 8 publications

Sedimentary response to a tectonically induced sea‐level fall in a shallow back‐arc basin: the Mulichinco Formation (Lower Cretaceous), Neuquén Basin, Argentina

Sedimentary response to a tectonically induced sea‐level fall in a shallow back‐arc basin: the Mulichinco Formation (Lower Cretaceous), Neuquén Basin, Argentina

Global relationships of Argentine (Neuquén Basin) Early Cretaceous ammonite faunas

The Lower Cretaceous Chañarcillo and Neuquén Andean basins: ammonoid biostratigraphy and correlations

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