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Series: GSA Memoirs
Published: 23 January 2023
DOI: 10.1130/2022.1220(15)
EISBN: 9780813782201
... the transition from the Granite-Rhyolite Province to Grenville orogenic cycle, and for potential collisional interaction with Amazonia, due to Paleozoic sedimentary cover or tectonic reworking. Basement rocks sampled by drill core in the east-central United States include 1.5–1.35 Ga magmatic rocks, some...
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Journal Article
Journal: Palynology
Published: 03 April 2022
Palynology (2022) 46 (2): 1–19.
...Bianca Tacoronte Gomes; Maria Lúcia Absy; Carlos D’Apolito; Dayenari Caballero-Rodríguez; Camila Martínez; Carlos Jaramillo Abstract The Neogene was a critical interval in the establishment of the modern geography and biotic composition of Amazonia. Because the region is covered with rainforest...
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Journal Article
Journal: Geology
Published: 05 January 2022
Geology (2022) 50 (4): 465–469.
... in Western Amazonia during the Neogene is still an unsolved question. Despite broad proxy-based evidence of such events, the pathways and duration of late Miocene marine incursions remain controversial. We provide coupled calcareous and organic microfossil and geochemical data from six onshore cores from...
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Journal Article
Journal: PALAIOS
Published: 13 September 2021
PALAIOS (2021) 36 (8): 269–282.
... trophic relationships and community structure (e.g., Brinkman et al. 2007 ; Carrano et al. 2016 ). Much of our knowledge of western Brazilian Amazonia ecosystems during the upper Miocene comes from the study of vertebrate bonebeds of the Solimões Formation, in the Acre Basin. These deposits...
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Journal Article
Journal: Palynology
Published: 02 January 2021
Palynology (2021) 45 (1): 115–141.
...Fátima Praxedes Rabelo Leite; Silane Aparecida Ferreira da Silva-Caminha; Carlos D’Apolito Abstract In western Amazonia, palynology has been the main source of chronological information for the Neogene Period. The Solimões Formation in northwestern Brazil has hundreds of meters of fine-grained...
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Journal Article
Journal: Palynology
Published: 02 January 2021
Palynology (2021) 45 (1): 3–14.
...Bianca Tacoronte Gomes; Maria Lúcia Absy; Carlos D’Apolito; Carlos Jaramillo; Ronaldo Almeida Abstract Western Amazonia underwent dramatic changes in its landscape and environments during the Neogene, which led to its extant, hyperdiverse, tropical rainforest. Although the palynological fossil...
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Journal Article
Journal: Palynology
Published: 01 October 2020
Palynology (2020) 44 (4): 675–695.
... that Pliocene sedimentation is also recorded in the Western Amazonia of Peru, and provides new palynological information compared with the Mio–Pliocene Solimões, Acre, and eastern Amazonas basins. Figure 1. Location of the six studied deep exploration wells (white-black circles). Structural boundaries...
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Journal Article
Journal: Palynology
Published: 01 June 2014
Palynology (2014) 38 (1): 78–89.
...Maria Lúcia Absy; Antoine M. Cleef; Carlos D’Apolito; Manoela F.F. da Silva Abstract Pollen rain studies in Amazonia are scarce but of utmost importance to support interpretations of pollen records. We have investigated modern surface pollen spectra and vegetation in an Amazon location, Carajás...
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Journal Article
Published: 01 December 2012
The Canadian Mineralogist (2012) 50 (6): 1453–1466.
...Artur C. Bastos Neto; Vitor P. Pereira; Amanda C. Pires; Luc Barbanson; Alain Chauvet Abstract The Madeira deposit (Sn, Nb, Ta) at Pitinga, Amazonia, in Brazil, is associated with the albite-enriched facies of the A-type Madeira granite (~1,820 Ma). Fluorine (cryolite), Y, REE, Li, Zr, and Th...
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Journal Article
Journal: Paleobiology
Published: 01 November 2010
Paleobiology (2010) 36 (4): 534–554.
..., this diversification occurred within the lower to middle Miocene Pebas Formation of western Amazonia. Only one taxon associated with this radiation ( Anticorbula ) remains extant. We conducted a series of phylogenetic analyses to characterize diversification of Corbulidae within the Pebas Formation and relate...
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Journal Article
Journal: GSA Bulletin
Published: 01 September 2009
GSA Bulletin (2009) 121 (9-10): 1298–1324.
... intrusives of Peru reveal 1.15 Ga of intermittent magmatism along central Western Amazonia, the Earth's oldest active open continental margin. The eastern Peruvian batholiths are volumetrically dominated by plutonism related to the assembly and breakup of Pangea during the Paleozoic-Mesozoic transition...
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Journal Article
Journal: Geology
Published: 01 August 2006
Geology (2006) 34 (8): 669–672.
... of the central Grenville Province and southwest Amazonia were compiled with our new results ( Fig. 2 ). The different closure temperatures ( T c ) of these minerals were used to calculate regional cooling rates for the major tectonic units across the transects ( Fig. 1 ; Appendix A [see footnote 1...
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Journal Article
Journal: Economic Geology
Published: 01 May 2006
Economic Geology (2006) 101 (3): 585–605.
...-type magmas ( Burnham and Ohmoto, 1980 ). The late H 2 O-NaCl-CaCl 2 fluid, responsible for the late microcline alteration, was associated with a third generation of pyrite and postdates the auriferous stages in the Serrinha deposit. The Serrinha gold deposit in southern Amazonia...
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Journal Article
Journal: PALAIOS
Published: 01 April 2006
PALAIOS (2006) 21 (2): 197–209.
...CARINA HOORN Abstract The lower Apaporis River area (Colombian Amazonia) is characterized by fluvial and coastal sediments of Middle to Late Miocene age. These sediments, here informally called Apaporis sand unit, are in nonconformable contact with the Precambrian basement, and were deposited...
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Journal Article
Published: 01 May 2005
The Journal of Geology (2005) 113 (3): 309–323.
... for the respective roles of Baltica, the Kalahari, and Amazonia within the Rodinia framework is of variable quality. The case for Baltica seems the most compelling on the basis of both paleomagnetic evidence and geological observations. The paleomagnetically derived position of Baltica relative to Laurentia...
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Journal Article
Journal: GSA Bulletin
Published: 01 August 2003
GSA Bulletin (2003) 115 (8): 983–993.
... Miocene–upper Miocene Pebas Formation in Western Amazonia. Molluscan 87 Sr/ 86 Sr ratios identify different freshwater sources. Andean runoff was the dominant water source in Miocene Western Amazonia, though there was occasional influx of waters from cratonic catchments. At only one stratigraphic level...
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Journal Article
Journal: PALAIOS
Published: 01 December 2002
PALAIOS (2002) 17 (6): 591–601.
...MURRAY K. GINGRAS; MATTI RÄSÄNEN; ALCEU RANZI Abstract Sedimentary models that apply to the Middle Miocene succession in Amazonia are controversial. Although tidally-influenced sedimentary deposits have been described from several locations, the identification of brackish-water or marine facies...
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Journal Article
Published: 01 March 2002
Journal of Paleontology (2002) 76 (2): 265–270.
...GEERAT J. VERMEIJ; FRANK P. WESSELINGH Abstract Two neogastropod species occur in brackish intervals in the Pebas Formation (late Middle to early Late Miocene) of Peru and Colombia in western Amazonia. Purpura woodwardi Roxo, 1924 , is assigned to Melongena Schumacher, 1817 (Melongenidae...
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Journal Article
Journal: Clay Minerals
Published: 01 September 1988
Clay Minerals (1988) 23 (3): 279–289.