Rapid and major coastal subsidence during the late Miocene in south-central Chile

Encinas, Alfonso; Finger, Kenneth L.; Nielsen, Sven N.; Lavenu, Alain; Buatois, Luís A.; Peterson, Dawn E.; Roux, J.P. Le

doi:10.1016/j.jsames.2007.07.001

Cited by 50 publications

(79 citation statements)

References 63 publications

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“…However, Finger et al (2007) also correlated the mollusk fauna with well dated late Oligocene to middle Miocene occurrences in Peru (see also DeVries and Frassinetti, 2003) and concluded that the older mollusk fauna was reworked during the latest Miocene to early Pliocene. Reconstructions of the tectonic history of the Navidad and Arauco areas (Melnick and Echtler, 2006;Encinas et al, 2008;Farías et al, 2008) support a history of tectonic downwarp and uplift as outlined by Finger et al (2007). Our localities are the same as those of Finger et al (2007) and locality data including GPS points (Table 1), detailed strontium data for individual samples and localities (Table 2), and representative sample photos (Fig.…”

Section: Geologic Setting and Sampling Sitessupporting

confidence: 60%

Early Miocene subtropical water temperatures in the southeast Pacific

Nielsen

Glodny

2009

Palaeogeography, Palaeoclimatology, Palaeoecology

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Cenozoic climate of western South America is strongly controlled by features like Andean uplift and the Humboldt Current. The first strontium isotope age data from central and southern Chile provide a latest Oligocene to late early Miocene age for classic warm-water mollusk faunas reaching as far south as 45°S.Comparison with the biogeography of congeneric living species indicates that sea surface temperatures off central and southern Chile during that time were at least 5°C higher than today; i.e., minimum annual mean sea surface temperatures for Darwin's Navidad fauna at 34°S are estimated as 20°C. As expected, the number of tropical taxa decreases towards the south but several are still present as far south as 45°S. The ages scatter relatively broadly between ~24 and ~16 Ma, partly even within individual localities. Shallow water and deeper water faunas are revealed to have similar ages. When considered in light of convincing micropaleontological evidence for late Miocene to early Pliocene depositional ages, the Srisotope data support a hypothesis that the mollusk fauna is reworked.

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Section: Geologic Setting and Sampling Sitessupporting

confidence: 60%

Early Miocene subtropical water temperatures in the southeast Pacific

Nielsen

Glodny

2009

Palaeogeography, Palaeoclimatology, Palaeoecology

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“…Such drastic sea-level oscillations would be hard to image under any tectonic regime and certainly cannot be explained by subduction erosion. The latter was attributed by Encinas (2006) and Encinas et al (2008) to a common event that also affected other sectors in northern and south-central Chile, Peru, New Zealand, Japan and Costa Rica during the Late Miocene-early Pliocene. Subduction erosion according to this theory would have been the direct effect of a decrease in the sedimentation rate in the oceanic trench caused by an increasingly dry climate.…”

Section: Depositional Environmentmentioning

confidence: 99%

Reply to Comment of Finger et al. (2013) on: ‘Evidence for an Early-Middle Miocene age of the Navidad Formation (central Chile): Paleontological, paleoclimatic and tectonic implications’ of Gutiérrez et al. (2013, Andean Geology 40 (1): 66-78)

Roux

Gutiérrez

Hinojosa

et al. 2013

Andgeo

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“…4A). Macaronichnus is usu ally com mon in high en ergy, wave or tidal dom i nated set tings (Encinas et al, 2008;Pem ber ton et al, 2008;Aguirre et al, 2010;Quiroz et al, 2010;Buatois and Encinas, 2011).…”

Section: D£ugopole Sandstone Palaeoenvironmentmentioning

confidence: 99%

Middle Turonian trace fossils from the Bystrzyca and Długopole sandstones

Chrząstek

2013

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The Mid dle Turonian sed i ments of the Nysa K³odzka Graben (Bystrzyca Sand stone in the Stara Bystrzyca out crop and the D³ugopole Sand stone in D³ugopole Górne Quarry) con tain trace fos sils, which in clude Curvolithus sim plex, ?Macaronichnus isp., Ophiomorpha nodosa, Ophiomorpha isp., Palaeophycus tubularis, Thalassinoides cf. paradoxicus, T. suevicus and Thalassinoides isp. The as sem blage of trace fos sils points to the prox i mal Cruziana ichnofacies, that char ac ter izes the dis tal lower shoreface and the ar che typal Cruziana ichnofacies, typ i cal of up per off shore set tings. The trace fos sils ev i dence implies that sed i men ta tion took place in a shal low ba sin with pe ri ods of a sud den sed i ment in put, good ox y gen a tion and nor mal sa lin ity. The Bystrzyca and D³ugopole sand stones are de pos its of the shal low epicontinental sea that were de pos ited between the fair-weather and storm-wave base, in the dis tal lower shoreface-up per off shore set ting. The Bystrzyca Sand stone is rec og nized as storm-orig i nated de pos its, whereas the D³ugopole Sand stone is prob a bly the part of prograding "ac cu mu lation ter race". The source of ma te rial for the sand stone was the East Sudetic Is land and prob a bly also the Orlica-Bystrzyca Up lift. The stud ied sand stones are re lated to a re gres sion that started in the early/mid dle Mid dle Turonian and caused a rel ative up lift of the sur round ing land.

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Rapid and major coastal subsidence during the late Miocene in south-central Chile

Cited by 50 publications

References 63 publications

Early Miocene subtropical water temperatures in the southeast Pacific

Early Miocene subtropical water temperatures in the southeast Pacific

Reply to Comment of Finger et al. (2013) on: ‘Evidence for an Early-Middle Miocene age of the Navidad Formation (central Chile): Paleontological, paleoclimatic and tectonic implications’ of Gutiérrez et al. (2013, Andean Geology 40 (1): 66-78)

Middle Turonian trace fossils from the Bystrzyca and Długopole sandstones

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