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Remarks on the Tithonian–Berriasian Ammonite Biostratigraphy of West Central Argentina

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Remarks on the Tithonian–Berriasian Ammonite Biostratigraphy of West Central Argentina Volumina Jurassica, 2015, Xiii (2): 23–52 DOI: 10.5604/17313708 .1185692 Remarks on the Tithonian–Berriasian ammonite biostratigraphy of west central Argentina Alberto C. RICCARDI 1 Key words: Tithonian–Berriasian, ammonites, west central Argentina, calpionellids, nannofossils, radiolarians, geochronology. Abstract. Status and correlation of Andean ammonite biozones are reviewed. Available calpionellid, nannofossil, and radiolarian data, as well as radioisotopic ages, are also considered, especially when directly related to ammonite zones. There is no attempt to deal with the definition of the Jurassic–Cretaceous limit. Correlation of the V. mendozanum Zone with the Semiforme Zone is ratified, but it is open to question if its lower part should be correlated with the upper part of the Darwini Zone. The Pseudolissoceras zitteli Zone is characterized by an assemblage also recorded from Mexico, Cuba and the Betic Ranges of Spain, indicative of the Semiforme–Fallauxi standard zones. The Aulacosphinctes proximus Zone, which is correlated with the Ponti Standard Zone, appears to be closely related to the overlying Wind­ hauseniceras internispinosum Zone, although its biostratigraphic status needs to be reconsidered. On the basis of ammonites, radiolarians and calpionellids the Windhauseniceras internispinosum Assemblage Zone is approximately equivalent to the Suarites bituberculatum Zone of Mexico, the Paralytohoplites caribbeanus Zone of Cuba and the Simplisphinctes/Microcanthum Zone of the Standard Zonation. The C. alternans Zone could be correlated with the uppermost Microcanthum and “Durangites” zones, although in west central Argentina it could be mostly restricted to levels equivalent to the “Durangites Zone”. The Substeueroceras koeneni Zone ranges into the Occitanica Zone, Subalpina and Privasensis subzones, the A. noduliferum Zone could be equivalent to the Dalmasi Subzone, Occitanica Zone, to lower part of the Boissieri Zone, and the S. damesi Zone could range through the upper part of the Boissieri Zone to the lower part of the Pertransiens Zone. Division of the Substeueroceras koeneni Zone and a precise correlation between the Andean ammonite zones and the international standard require new systematic and stratigraphic studies. INTRODUCTION in order to evaluate their reliability and, if necessary, to sug- gest changes and/or specific new studies. In the last decades correlation of the Tithonian-Berriasian Ammonite biostratigraphy discussed below applies to the ammonite biostratigraphy of west central Argentina, as sum- sedimentary succession exposed in the Neuquén Basin marized in several papers published in Argentina (cf. Ric- of west central Argentina. This basin covers more than cardi et al., 2011; Vennari et al., 2013), has not undergone 160,000 km2 and contains a thick Mesozoic sedimentary se- major changes. Meanwhile, and as it will be discussed be- quence characterized by Upper Triassic–Oxfordian, Ti thonian– low, studies originated in other regions have modified it in Barremian and Maastrichtian marine strata. The Tithonian– different ways. Berriasian is represented by time-transgressive lithofacies These circumstances prompted this study, and an attempt within a series of, at least, seven sequences that show progra- to analyze all available information on the status and correla- dation of continental and littoral facies over more distal tion of the Andean biozones with the international standard, facies. Boundaries between these depositional sequences 1 Museo de La Plata, Paseo del Bosque s/n, 1900 La Plata, Argentina; e-mail: [email protected]. - - - - - 24 Alberto C. Riccardi represent stratigraphic discontinuities (cf. Gulisano et al., and Casa Pincheira, in southern Mendoza province) and the 1984; Mitchum, Uliana, 1985; Riccardi, 1988; Legarreta, Franconian Sublithacoceratini. Leanza (1980, 1981) accept- Gulisano, 1989; Legarreta, Uliana, 1991, 1996; Leanza et ed this correlation, adding that the V. mendozanus Zone also al., 2011), and faunal diversity and correlation potential in- includes the genus Pseudinvoluticeras Spath, 1925 “that in crease away from those boundaries. Somaliland, Madagascar and Mexico” is referred to the Lower The present remarks are focused on the ammonite faunas Tithonian. The V. mendozanus Zone was also extended to the and biostratigraphy, although related information on other Semiforme Zone (cf. Enay, 1964; Callomon, 1992; Riccardi macro- and microfossils, and on geochronological data, is 2008a, b; Riccardi et al., 2011) because of the co-occurrence also considered. Correlations are therefore referred to am- of Virgatosphinctes spp. and Pseudolissoceras Spath. monite zonal (Standard and local) schemes, whose correla- In the last ten years some authors (Parent, Capello, 1999; tion is the primary goal of this paper. There is no attempt to Parent, 2003; Parent et al., 2006, 2011a, b, 2013a; Parent, deal here with the precise definition of the Jurassic-Creta- Cocca, 2007; Zeiss, Leanza, 2010) have separated the am- ceous limit, and therefore the use of terms such as monites traditionally ascribed to the Early Tithonian V. men­ “Tithonian”, “Berriasian”, “Upper/Late Jurassic” and “Low- dozanus Zone into two different assemblages, whereas some er/Early Cretaceous” have been kept to a minimum and is (see Parent et al., 2011a, b) have proposed that the lower usually adopted when quoting other sources. It is considered assemblage could be Late Kimmeridgian. Ammonites in- that once biostratigraphic correlations are well established cluded in the V. mendozanus Zone had, in fact, already been definition of Stage and System boundaries will follow by referred to two different Early Tithonian assemblages by convention. Wiedmann (1968, 1980a, b), who characterized the lower In relation to the ammonites zones of the international one by the presence of “Torquatisphinctes” (or by “Virgato­ standard (see Fig. 1) it should be noticed that Wimbledon et sphinctes pseudolictor”) and the upper by “Virgatosphinctes al. (2013, p. 451; cf. also Bulot et al., 2014) have proposed mendozanus” (or by V. andesensis and V. choicensis). Zeiss to abandon the “Durangites Zone” of the topmost Tithonian and Leanza (2010) also divided, without much elaboration, because of the possibility that this genus may be endemic to the V. mendozanus Zone into a lower part with “Lithaco­ the Mexican-Cuban region. Moreover, they have proposed ceras” malarguense (Spath) and an upper, with Choicensi­ to use the “Protocanthodiscus andreaei Zone”, as a local in- sphinctes choicensis (Burckhardt), which were referred re- dex for the Mediterranean area. spectively to the Hybonotum and Darwini zones. In addition they considered the V. mendozanus Zone as an equivalent to the Mazapilites beds of Mexico. Some of the authors men- AndeAn TiThoniAn-BerriAsiAn tioned above (see Parent et al., 2011a, b) based the age pro- AmmoniTe Biozones posed for the lower assemblage, underlying a redefined V. mendozanus Zone, in the supposed presence (see Parent, VIRGATOSPHINCTES MENDOZANUS ZONE Capello, 1999; Parent, 2003) of representatives of Virga­ [≈ UPPERMOST DARWINI?–SEMIFORME lithacoceras Olóriz, i.e. V. cf. acricostatum Ohmert et Zeiss/V. malarguense (Spath)/V. picunleufuense Parent et al., STANDARD ZONES] (Fig. 1) later transferred, first (Parent, 2003) to Euvirgalithacoceras Zeiss et al. and later still (see Parent et al., 2006, 2011a, b, In the Neuquén Basin the first ammonite assemblages 2013a, b) to “Lithacoceras” or Lithacoceras Hyatt. Inclusion overlying the continental beds of the Tordillo Formation are in Euvirgalithacoceras was accepted by Salazar Soto (2012), typically represented in the lower beds of the Vaca Muerta who reported the species E. malarguense (Spath) from the Formation and were included in the Virgatosphinctes mendo­ Baños del Flaco Formation, in the Chilean Rio Maitenes sec- zanus (Assemblage) Zone (Burckhardt, 1900; cf. Leanza, tion, together with representatives of Virgatosphinctes, Choi­ 1980; Riccardi, 1984). This zone was usually considered (or censisphinctes Leanza and Pseudolissoceras. This assem- its lower part or in full) as an approximate equivalent to the blage was referred to the lower Middle Tithonian (see Darwini Zone (upper part) of the Lower Tithonian (Zeiss, below). 1968, 1977; Wiedmann, 1980a, b; Leanza, 1980, 1981; Ric- The presence of Euvirgalithacoceras in the Neuquén Ba- cardi, 1984). According to Zeiss (1968; Leanza, 1980) the sin, on the basis of “Subplanites malarguensis Spath”, has V. mendozanus Zone could be equivalent to the Palatinus been discounted by Riccardi (2008b, p. 636–637). It should Subzone, uppermost Darwini Zone, of the German Franco- also be mentioned that the supposed close similarity (Parent nia region, because of the similarities between the ammo- et al., 2011a, p. 62) between “Lithacoceras pinculeufuense” nites figured by Indans (1954) (fossils collected by C. Burck- and “Perisphinctes (Lithacoceras) albulus” (Quenstedt, hardt and coming from two localities, i.e. Bardas Blancas 1887, pl. 25: 8; Berckhemer, Hölder, 1959, p. 55, pl. 9: 48; - - - - - - - - - - Ammonite zones Calcareous nannofossils NA Radiolaria Buchia zones Age Polarity Calpionellid 7 [Ma] Chron west central zones British standard Cuba Mexico zones / subzones events zones Tx range California 1 1 1 Argentina 2 3 4 5 6 6 8 Columbia 9 M14 dadayi B. pacifica 139.4 Otopeta NK-2b NK-2b M15 Alpillensis S. damesi murgeanui D B. uncitoides Remarks on the Tithonian–Berriasian ammonite biostratigraphy of west
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