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Loma Chumico Formation

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Upper Cretaceous radiolarians of the lower <b>Loma</b> <b>Chumico</b> <b>Formation</b> (Coniacia...
Published: 20 March 2019
Figure 8. Upper Cretaceous radiolarians of the lower Loma Chumico Formation (Coniacian–Santonian) from the eastern and southeastern Nicoya Peninsula, Costa Rica. The assemblages indicate that the Loma Chumico Formation is no older than the Coniacian. Scanning electron microscopy images. 1–4
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List of radiolarian species recovered from the lower <b>Loma</b> <b>Chumico</b> <b>Formation</b>...
Published: 20 March 2019
Figure 9. List of radiolarian species recovered from the lower Loma Chumico Formation (Coniacian–Santonian), Costa Rica. The assemblages indicate that the Loma Chumico Formation is no older than the Coniacian. The composite range of each species was obtained by stacking partial ranges from
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Geochemical characteristics of the <b>Loma</b> <b>Chumico</b> <b>Formation</b> (supra-subduction...
Published: 20 March 2019
Figure 11. Geochemical characteristics of the Loma Chumico Formation (supra-subduction affinity) and the underlying Pochote Unit (oceanic plateau affinity) and Manzanillo Terrane (oceanic plateau affinity), Nicoya Peninsula, Costa Rica. The volcanic material of the Loma Chumico Formation
Journal Article
Journal: GSA Bulletin
Published: 20 March 2019
GSA Bulletin (2019) 131 (9-10): 1555-1580.
...Figure 8. Upper Cretaceous radiolarians of the lower Loma Chumico Formation (Coniacian–Santonian) from the eastern and southeastern Nicoya Peninsula, Costa Rica. The assemblages indicate that the Loma Chumico Formation is no older than the Coniacian. Scanning electron microscopy images. 1–4...
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Series: AAPG Memoir
Published: 01 January 2015
DOI: 10.1306/13531950M1083653
EISBN: 9781629812724
... ages are proven to be considered source rocks: (1) lower–middle Eocene Punta Gorda and Touche Formations along the Nicaraguan Rise (SR1), (2) middle Eocene, Yellow Limestone Group in Jamaica Island (SR2), (3) late Cretaceous (Cenomanian–Campanian) Loma Chumico Formation present mainly in northwestern...
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Geological map of the <b>Loma</b> <b>Chumico</b>-Río Blanco area, in the vicinity of Sant...
Published: 20 March 2019
the locations of the stratigraphic logs depicted in (B). (B) Stratigraphic logs of the Chumico and Berrugate members (Loma Chumico Formation). Radiolarian samples collected for this study are indicated. The log L3 represents the stratotype of the Loma Chumico Formation, as well as the stratotype of the Chumico
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Early late Campanian ( Radotruncana calcarata  total range zone) globotrunc...
Published: 20 March 2019
Figure 10. Early late Campanian ( Radotruncana calcarata total range zone) globotruncanids from the uppermost Berrugate Member (upper Loma Chumico Formation) and the lowermost Piedras Blancas Formation, Nicoya Peninsula, Costa Rica. The assemblages indicate that the Loma Chumico Formation
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Primitive-mantle-normalized multielement diagrams of the Manzanillo Terrane...
Published: 20 March 2019
Figure 12. Primitive-mantle-normalized multielement diagrams of the Manzanillo Terrane (oceanic plateau affinity) and Pochote Unit (oceanic plateau affinity) in (A) and the overlying Loma Chumico Formation (supra-subduction affinity) in (B), including a comparison of the Loma Chumico rocks
Journal Article
Journal: PALAIOS
Published: 01 October 2003
PALAIOS (2003) 18 (4-5): 301-304.
... , S.E. , 1996 . Paleoceanography of organic-rich rocks of the Loma Chumico Formation of Costa Rica, Late Cretaceous, eastern Pacific : Sedimentology , v. 43 , p. 691 - 718 . Erlich , R.N. , Palmer-Koleman , S.E. , and Lorente , M.A. , 1999a . Geochemical characterization...
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Discrimination diagrams after  Leterrier et al. (1982 ; A–C) and  Beccaluva...
Published: 20 March 2019
Figure 13. Discrimination diagrams after Leterrier et al. (1982 ; A–C) and Beccaluva et al. (1989 ; D) showing magmatic affinities of clinopyroxenes from the Loma Chumico Formation, Nicoya Peninsula, Costa Rica, in comparison with clinopyroxenes from the Sierra Madre Occidental ignimbrites (SMO
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Three-dimensional palinspastic reconstructions of the active margin of nort...
Published: 20 March 2019
accretion. The enlarged detailed reconstructions display the Berrugate Arc and the Tempisque Forearc Basin. The activity of the Berrugate Arc produces volcaniclastic rocks such as those embedded in the Loma Chumico and Sabana Grande formations. The Loma Chumico Formation shows different facies depending
Journal Article
Journal: GSA Bulletin
Published: 01 July 2003
GSA Bulletin (2003) 115 (7): 832-844.
... ; Lundberg, 1991 ). Although basaltic sandstones dominate in some sequences, there are also volcaniclastic sandstones that contain abundant nonbasaltic framework components. For example, volcaniclastic wackes from the Loma Chumico Formation of the upper Nicoya Complex exhibit a bimodal composition consisting...
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Series: AAPG Memoir
Published: 01 January 2015
DOI: 10.1306/13531951M1083654
EISBN: 9781629812724
... onshore) suggests a direct correlation with Thomas River and Guinea Corn Formations and therefore supports the hydrocarbon generation potential of these Cretaceous, onland formations in Jamaica (Mitchell, 2005). The Loma Chumico Formation of the Pacific Margin of Costa Rica in Central America...
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Series: AAPG Memoir
Published: 01 January 2003
DOI: 10.1306/M79877C1
EISBN: 9781629810546
... of the Caribbean Plate may have depleted the dissolved oxygen content of this potential stranded-water mass, there-by enhancing the preservation potential of sedimentary organic matter ( Figure 14 ; Erlich et al., 1996 ). Loma Chumico Formation radiolarian cherts (organic carbon–rich and carbon-lean) were...
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Journal Article
Published: 01 January 2005
Micropaleontology (2005) 51 (1): 1-37.
... the Nicoya Complex (Shmidt-Effing 1979) and Santa Elena Massive (Shmidt-Effing 1980), Loma Chumico Formation ( Erlich et al. 1996 ), Esperanza Unit ( Baumgartner 1984b ) and Herradura block ( Baumgartner et al. 2000 ; Popova et al. 2000 ) of Costa Rica. In Central and South America radiolarians have...
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