Marion Weber

Universidad Nacional de Colombia

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A. Cardona

Universidad Nacional de Colombia

V. Valencia

Washington State University

Antonio García‐Casco

Universidad de Granada

Joaquín A. Proenza

Universitat de Barcelona

S. Zapata

Universidad del Rosario

Mónica Tobón

Universidad Nacional de Colombia

Camilo Montes

Universidad del Norte

Carlos A. Ramírez-Cárdenas

Colombian Geological Survey

Carlos Errázuriz‐Henao

Universidad Nacional Autónoma de México

Arturo Gómez‐Tuena

Universidad Nacional Autónoma de México

Cooperative Institutions

Universidad Nacional de Colombia

Colombian Geological Survey

Instituto de Geociencias

Smithsonian Tropical Research Institute

Universitat de Barcelona

Universidad Nacional Autónoma de México

Universidad EAFIT

University of Arizona

University of Chile

Universidade de São Paulo

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The Mercaderes-Rio Mayo xenoliths, Colombia : their bearing on mantle and crustal processes in the Northern Andes

ProQuest eBooks (1998)

Marion Weber

Xenolith

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Citations (9)

The Cabo de la Vela Mafic-Ultramafic Complex, Northeastern Colombian Caribbean region: a record of multistage evolution of a Late Cretaceous intra-oceanic arc

Geological Society London Special Publications (2009)

Marion Weber A. Cardona F. Paniagua Umberto G. Cordani Liuda Johana Sepúlveda

Abstract Ophiolite-related rocks accreted to Caribbean Plate margins provide insights into the understanding of the intra-oceanic evolution of the Caribbean Plate and its interaction with the continental margins of the Americas. Petrological, geochemical and isotope (K–Ar, Sr and Nd) data were obtained in serpentinites, gabbros and andesite dykes from the Cabo de la Vela Mafic–Ultramafic Complex from the Guajira Peninsula, in the northernmost Colombian Caribbean region. Field relations, metasomatic alteration patterns and whole rock–mineral geochemistry combined with juvenile isotope signatures of the different units suggest that gabbros and serpentinites formed in a slow-spreading supra-subduction zone that was brought to shallower depths and subsequently evolved to an arc setting where andesitic rocks formed with little sediment input. The tectonomagmatic evolution of the Cabo de la Vela Mafic–Ultramafic Complex involved an intra-oceanic arc that evolved from pre-Campanian time to 74 Ma. Relationships with other units from the Guajira Peninsula show either the existence of a mature arc basement or a series of coalesced allocthonous arcs, juxtaposed before accretion onto the passive continental margin of South American in pre-Eocene times.

Ultramafic rock

Vela

Island arc

10.1144/sp328.22

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Citations (37)

The Guaviare Complex: new evidence of Mesoproterozoic (ca. 1.3 Ga) crust in the Colombian Amazonian Craton

Boletín Geológico (2020)

Carolina Amaya-López Jorge Julián Restrepo Marion Weber Federico Alberto Cuadros Jiménez Nilson Francisquini Botelho

The Guaviare Complex is a new unit defined in the Colombian Amazonian Craton, which is part of the Precambrian basement located in southeastern Colombia. It is divided into three units according to their textural and compositional characteristics, termed Termales Gneiss, Unilla Amphibolite, and La Rompida Quartzite. Termales Gneiss rocks are petrographically classified as gneisses and quartz-feldspar granofels, with the local formation of blastomylonite-like dynamic rocks. The Unilla Amphibolite consists of only amphibolites, and La Rompida Quartzite consists of muscovite quartzites, quartz-feldspar granofels, and quartz-muscovite schists. The protoliths of Termales Gneiss and Unilla Amphibolite were formed in the Mesoproterozoic at 1.3 Ga due to bimodal magmatism (felsic and mafic) derived from mantle material, with some crust contamination that was probably related to the formation of extensional arcs associated with trans-arc basins in the NW section of the Amazon Craton. La Rompida Quartzite rocks originated from sediments derived from granite rocks and from other, older areas of the craton. These rocks have a maximum age of 1.28 Ga. The low-to-medium grade metamorphism that affected these units occurred from 1.28 to 0.6 Ga, most likely concurrently with the Putumayo orogeny of approximately 1.0 Ga, although it may have been an independent event.

10.32685/0120-1425/boletingeo.47.2020.502

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Citations (8)

Climate-driven compositional modifications of arc volcanoes along the East Equatorial Pacific Margin — The magmatic response to a cooling planet

Earth-Science Reviews (2022)

Carlos Errázuriz‐Henao Arturo Gómez‐Tuena Mattia Parolari Marion Weber

Seafloor Spreading

Forearc

Authigenic

10.1016/j.earscirev.2022.104228

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Citations (1)

Tectonomagmatic setting and provenance of the Santa Marta Schists, northern Colombia: Insights on the growth and approach of Cretaceous Caribbean oceanic terranes to the South American continent

Journal of South American Earth Sciences (2009)

A. Cardona V. Valencia Camilo Bustamante Antonio García‐Casco G. Ojeda

Island arc

Continental Margin

Back-arc basin

Volcanic arc

Continental arc

Geochronology

Protolith

Detritus

Passive margin

Accretionary wedge

10.1016/j.jsames.2009.08.012

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Citations (63)

Neogene Ridge subduction and slab window in the Northern Andean block - Tectonic implications

AGU Fall Meeting Abstracts (2019)

Susana Hoyos Marion Weber A. M. Cardenás-Rozo Jose Duque

Neogene

Slab

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Citations (0)

MIOCENE THOLEIITIC AND CALK-ALKALINE MAGMATISM FROM THE NORTHERN COLOMBIAN ANDES – IMPLICATIONS FOR MAGMA PETROGENESIS IN THE NORTHERN VOLCANIC ZONE

Abstracts with programs - Geological Society of America (2018)

Marion Weber José Duque-Trujillo Susana Hoyos Andrés Cárdenas Jorge Gómez Tapias

Petrogenesis

10.1130/abs/2018am-324534

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Reconstruction of multiple tectonic events in continental margins by integrated tectonostratigraphic and geochronological analysis: the Mesozoic to Paleogene Caribbean-South American interaction in northeastern Colombia

EGUGA (2013)

A. Cardona Camilo Montes Germán Bayona Víctor Valencia Diego Armando Ramírez

Paleogene

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Transient Cenozoic tectonic stages in the southern margin of the Caribbean plate: U-Th/He thermochronological constraints from Eocene plutonic rocks in the Santa Marta massif and Serranía de Jarara, northern Colombia

Geologica Acta (2011)

A. Cardona V. Valencia Marion Weber Jose Duque Camilo Montes

We use U-Th/(He) zircon and apatite thermochronology and Al in hornblende geobarometry from Eocene granitoids of the Sierra Nevada de Santa Marta and Guajira uplifted massifs in northern Colombia to elucidate the exhumation history of the northern South America continental margin and its bearing to Cenozoic Caribbean– South American plate interactions. Aluminium in hornblende geobarometry from the Eocene Santa Marta batholith yields pressures between 4.9±0.6kbar and 6.4±0.6kbar, which indicate that at least, 14.7-19.2km of unroofing took place since 56-50Ma in the northwestern Sierra Nevada de Santa Marta. In the Guajira Peninsula, calculated pressures for the Eocene Parashi stock are 2.3±0.6kbar and 3±0.6kbar. Stratigraphic considerations pertaining to Oligocene conglomerates from the Guajira area suggest that 6.9-9km of crust was lost between 50Ma and ca. 26Ma. U-Th/He zircon and apatite thermochronology from granitoids in the Sierra Nevada de Santa Marta shows the existence of major exhumation events in the Late Eocene (ca. 45-40Ma), Late Oligocene (ca. 25Ma) and Miocene (ca. 15Ma). The Guajira region records the Late Eocene to Early Oligocene (35-25Ma) event, but it lacks evidence for the Miocene exhumation phase. These differences reflect isolation of the Guajira region from the Sierra Nevada de Santa Marta and the Andean chain due to extensive block rotation and transtensional tectonics that affected the region during post-Eocene times. The post-Eocene events correlate in time with an increased convergence rate and the frontal approach of North and South America. It is suggested that the two major tectonic mechanisms that govern exhumation in these Caribbean massifs are: 1) subduction of the Caribbean plate, and 2) post Eocene changes in plate convergence obliquity and rates that caused the South American continental margin blocks to override the Caribbean plate. Temporal correlation with other Caribbean and Northern Andean events allows to resolve the regional Cenozoic plate tectonic reorganizations experienced by the South American, Caribbean and Pacific plates at a regional scale

Thermochronology

Batholith

Massif

10.1344/105.000001739

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Citations (36)

Fossil leaves, woods, gastropods, and a crocodile tooth: Is the Amagá Formation worth exploring?

Revista de la Academia Colombiana de Ciencias Exactas Físicas y Naturales (2023)

Andrés Cárdenas José Daniel Giraldo Daniel Monterrosa Marion Weber

We have generated a spatial framework for macrofossil searching based on the current knowledge of fossil localities and fossil beds reported for the Amagá Formation in the northwestern Andes in Colombia. Our results show that twenty-three fossil localities and ninety-five fossil beds are distributed along this sedimentary succession. Preservation potential is higher in the Lower Member, given the high accommodation space and the dominance of a meandering fluvial system, compared with the Upper Member, where there was less accommodation space with a braided fluvial system controlling it. Our findings show that even though paleontological studies are null in this area, there are several options to find terrestrial macrofossil assemblages that will allow us to investigate the possible biological role of global climatic changes and regional tectonics in the Neotropical biomes based on the Amagá Formation.

Macrofossil

Dominance (genetics)

Fossil wood

Biome

10.18257/raccefyn.1896

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Citations (1)