Santo Domingo Formation
This article is about the Miocene formation in southern Chile. For the Eocene formation in northwestern Argentina see
Laguna Brava Formation .
Santo Domingo Formation (Spanish : Formación Santo Domingo ) is a mainly marine Miocene sedimentary formation located in south–central Chile .[ 1] [ 3] The formation was defined by R. Martínez Pardo and Mario Pino in 1979 and named after the roadcut locality they studied about 19 kilometres (12 mi) southeast of Valdivia .[ 1] [ 2] Sediments of the formation accumulated in Valdivia and Osorno–Llanquihue Basin .[ 3]
The formations overlie a basement consisting of metamorphic and igneous rocks , the Bahía Mansa Metamorphic Complex and Cretaceous granitoids , respectively. In parts, it further overlies the coal–bearing Pupunahue–Catamutún Formation .[ 1] The sedimentary facies of the Santo Domingo Formation are composed of sandstone , siltstone , and mudstone with smaller amounts of conglomerate .[ 2] The formation underlies Pliocene and Quaternary sediments.[ 2]
Fossil content
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Some of the trace fossils that can be found in the Santo Domingo Formation are Zoophycos isp. , Chondrites isp., Phycoshiphon isp., Ophiomorpha isp. Thalassinoides isp., Asterosoma isp., and Terebellina isp.[ 4]
The benthic foraminifera found in the Santo Domingo Formation are broadly similar to those found in other Chilean sedimentary formations of the Neogene, like the Navidad Formation of Central Chile , Ranquil Formation of Arauco Province , and Lacui Formation of Chiloé Island .
[ 5] The most common formaineral species of the Santo Domingo Formation are Hansenisca altiformis , Rectuvigerina transversa , and Sphaeroidina bulloides .[ 6]
See also
References
^ a b c d Encinas et al., 2008
^ a b c d Elgueta et al. ., 2000, p.16
^ a b Elgueta et al. ., 2000, p.10
^ Encinas et al., 2012
^ Finger, 2013, p.374
^ Finger, 2013, p.367
Bibliography
Elgueta, Sara; McDonough, Michael; Le Roux, Jacobus; Urqueta, Esteban & Duhart, Paul (2000), Estratigrafía y sedimentología de las cuencas Terciarias de la Región de Los Lagos (39-41°30'S) (in Spanish), Santiago, Chile: Servicio Nacional de Geología y Minería , ISSN 0020-3939
Encinas, Alfonso; Finger, Kenneth L.; Buatois, Luis A.; Peterson, Dawn E. (2012), "Major forearc subsidence and deep-marine Miocene sedimentation in the present Coastal Cordillera and Longitudinal Depression of south-central Chile (38°30'–41°45'S)", Geological Society of America Bulletin , 124 (7–8): 1262–1277, doi :10.1130/b30567.1 , hdl :10533/135235
Encinas, Alfonso; Buatois, Luis A.; Finger, Kenneth L. (2008), "Paleoecological and paleoenvironmental implications of a high-density Chondrites association in slope deposits of the Neogene Santo Domingo Formation, Valdivia, south-central Chile" , Ameghiniana , 45 (1): 225–231
Finger, Kenneth L. (2013), "Miocene foraminifera from the south-central coast of Chile" , Micropaleontology , 59 (4–5): 341–492, Bibcode :2013MiPal..59..341F , doi :10.47894/mpal.59.4.01 , retrieved 2019-02-21
Terranes Sedimentary formations and groups
Batholiths Metamorphic complexes Faults