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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Spätquartäre Sedimentation am Kontinentalrand des südöstlichen Weddellmeeres, Antarktis = Late quaternary sedimentation at the continental margin of the southeastern Weddell Sea, Antarcticaca)

Marion Weber

Sedimentation

Continental Margin

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Citations (4)

Historical memory of the geology of Antioquia: Emil Grosse and The Carboniferous Tertiary of Antioquia

Boletín Geológico (2021)

Felipe Velásquez Ruiz Marion Weber Verónica Botero

The Carboniferous Tertiary of Antioquia (TCA), published by Dr. Jakob Emil Grosse in 1926, is one of the most influential scientific results of the Ordinance 16 of 1918 of the Honorable Departmental Assembly of Antioquia. The work began with the main objective of quantifying the coal reserves of Antioquia, and showing their surface extension on a scale of 1:50 000, in a region that includes the Arma river to the Puente de Occidente and from the western side of the Cauca River to the Romeral lineament and the plains of Ovejas. As a result, extensive work comprising petrological, structural, and economic geology studies was published in a manuscript published in Spanish and German, plus four attached maps, including coal, gold, silver, kaolin, and carbonate mines, among others. In the present work, the four TCA maps were digitized at a scale of 1:50 000 with Bessel 1841 datum and created a unified file in .kml format, which can be used directly in field trips, via Google Earth on cell phones, tablets, or computers. The metadata associates the information in the TCA with the Servicio Geológico Colombiano for the year 2015. In addition, 480 thin sections were scanned, which were donated by Dr. Grosse to the Escuela Nacional de Minas and today are in the Museum of Geosciences of the Faculty of Mines of the Universidad Nacional de Colombia. The geospatial information contained in each thin section was interpreted and georeferenced, obtaining, as a result, a list with north and west geographic coordinates, in degrees, minutes, and seconds. This unpublished information is available in the supplementary material of this article. Finally, nine field trips were made to the places referenced in 23 photographs of the TCA between 1920 and 1923 to take their current equivalent and thus carry out a multi-temporal analysis of the TCA.

Geologic map

Lineament

10.32685/0120-1425/bol.geol.48.2.2021.570

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Citations (1)

Mineralogy and geochemistry of Fe-Ti oxide ores from the Don Dieguito massif-type anorthosite suite, Sierra Nevada de Santa Marta, Colombia

Boletín de la Sociedad Geológica Mexicana (2020)

Sebastián Betancur-Figueroa Cristina Villanova-de-Benavent Joaquín A. Proenza Marion Weber Natalia Acevedo

Fe-Ti oxide ores are commonly associated with Proterozoic massif-type anorthosite bodies emplaced during the Grenville orogeny (~1.2-1.0 Ga). Some of these anorthositic bodies occur in the northernmost part of the Santa Marta Massif, Colombia. They locally contain crosscutting Fe-Ti(-V) ore bodies between the El Hierro creek and the Don Dieguito river. We have distinguished two types of Fe-Ti(-V) ores: i) oxide-apatite norite (fine grained ilmenite and magnetite disseminated in an assemblage of apatite, amphibole, chlorite, rutile and sericitized plagioclase) and ii) banded nelsonite (coarser grained ilmenite, magnetite and apatite distributed in bands, with minor baddeleyite, srilankite and högbomite). Ilmenite in the two ore types display distinct hematite exsolution features: a)needle-like in the oxide-apatite norite ore; and b) two generations of exsolutions in the banded ore. Magnetite shows similar Ti and V contents in both ore types (0.4 wt % TiO2 and 0.5 wt % V2O3 on average in the oxide-apatite norite ore, 0.5 wt % TiO2 and 0.4 wt % V2O3 in the banded ore), whereas ilmenite has higher hematite, pyrophanite and geikielite components in the banded ore. The ores might have formed from the combination of fractional crystallization and magma mixing, with exsolution occurring probably at 575-600°C. This first detailed mineralogical and textural study of Fe-Ti(-V) oxide ores in anorthosite massifs from Colombia suggests that the Santa Marta Massif is an interesting target for future research.

Anorthosite

Ilmenite

Massif

Baddeleyite

Columbite

Layered intrusion

Norite

10.18268/bsgm2020v72n3a200720

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A Biogeochemical Imprint of the Panama Basin in the North Andean Arc

Geochemistry Geophysics Geosystems (2021)

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

Abstract Oceans and continents mingle at convergent margins. However, the effects of this interaction in the construction and evolution of the continental crust remain poorly understood. Here we use geochemical data from the Panama Basin and the Northern Volcanic Province of Colombia to reveal that the oceanological and biogeochemical processes of a subducted ocean basin are imprinted in the compositions of continental arc volcanoes. The Panama Basin is a biologically highly productive area of the Eastern Equatorial Pacific in which the strongly biogenic sedimentation is reclassified and preserved differently depending on tectonically controlled depositional environments. Due to a shallow lysocline, sediments deposited on newly formed spreading centers are carbonate‐rich, whereas those accumulated on older subsiding seafloor become gradually richer in terrigenous components, organic carbon and authigenic U. Volcanoes of the North Volcanic Province of Colombia erupt high‐Mg# andesites that are common in some arcs, but display unusually high U contents and a symmetrical or “parabolic‐shaped” along‐arc trace element and isotopic variations that appear unrelated to differentiation or the pre‐existent crustal architecture. Instead, the parabolic‐shaped elemental trends mirror the reconstructed compositional variations of sediments deposited across axis on the currently subducted Sandra and Buenaventura ocean ridges. We interpret that subduction of these ocean ridges delivered a compositionally variable sediment influx that influenced the compositions of arc magmas. These findings demonstrate a strong connectivity between oceans and continents, and further imply that arc volcanoes can be reliable records of the oceanological and biogeochemical conditions of long subducted ocean basins.

Volcanic arc

Convergent boundary

Terrigenous sediment

Andesites

Seafloor Spreading

Oceanic basin

Biogeochemical Cycle

Continental Margin

10.1029/2021gc009835

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Citations (3)

Late Pleistocene–Holocene environmental and climatic history of a freshwater paramo ecosystem in the northern Andes

Journal of Quaternary Science (2020)

Luisa Fernanda Patiño María I. Vélez Marion Weber César A. Velásquez-R.Santiago David

ABSTRACT This study presents the first multi‐proxy palaeoenvironmental and palaeoclimatic history for northern South America based on the palaeolimnological reconstruction of a pond located in a dry paramo at 3570 masl. During the Last Glacial Maximum (LGM), the study area was under glacial conditions, then during global events Heinrich Stadial 1 (HS1), Bølling–Allerød (BA), and the Younger Dryas (YD), the pond expanded, accumulation rates and proxies for erosion reached the highest values, indicative of humid conditions, with maxima in humidity during the BA and YD. Dry conditions and pond desiccation occurred in the Greenlandian–Northgrippian and by 6010 cal a bp the area was transformed into the mire of today. Comparisons with records from other sites in South America indicate that changes in humidity are most likely controlled by the Intertropical Convergence Zone, mainly during the glacial and postglacial, and by changes in the Pacific Ocean, more pronounced after the YD.

Stadial

Intertropical Convergence Zone

Last Glacial Maximum

10.1002/jqs.3249

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Citations (10)

METAMORFISMO DE LOS ESQUISTOS VERDES Y ANFIBOLITAS PERTENECIENTES A LOS ESQUISTOS DE SANTA MARTA, SIERRA NEVADA DE SANTA MARTA (COLOMBIA): ¿REGISTRO DE LA COLISIÓN ENTRE EL ARCO CARIBE Y LA MARGEN SURAMERICANA?

DOAJ (DOAJ: Directory of Open Access Journals) (2009)

Camilo Bustamante A. Cardona Mónica Saldarriaga Antonio García‐Casco Víctor Valencia

Los Esquistos de Santa Marta localizados en el segmento NW de la Sierra Nevada de Santa Marta, en el Caribe Colombiano, corresponden a una secuencia metamorfica del Cretacico Superior con protolito volcano-sedimentario de afinidad oceanica y continental. Las cuatro formaciones en las que se han dividido estos esquistos (Concha, Punta Betin, Cinto y Rodadero) presentan un grado metamorfico que varia entre la facies esquisto verde y la facies anfibolita alta. Las relaciones de campo y las caracteristicas petrograficas de los esquistos anfibolicos indican la existencia de un incremento abrupto en el grado de metamorfismo entre las formaciones Concha y Punta Betin y la Formacion Rodadero. Las condiciones de presion y temperatura calculadas por termobarometria convencional y bases termodinamicas internamente consistentes para los dos grupos de rocas anfibolicas indican presiones entre 3 y 5 kbar y temperaturas entre 300 y 500 °C para Concha y Punta Betin, y entre 7,6 y 9,5 kbar y entre 565 y 665 °C para Rodadero. Esto sugiere que las rocas de mas alto grado fueron sobrepuestas sobre las de mas bajo grado probablemente durante la exhumacion sin-metamorfica. Estas relaciones petrologicas en conjunto con las caracteristicas composicionales de los anfiboles calcicos es similar a otras rocas formadas en un tipo barico de media presion y temperatura, que sugiere que los Esquistos de Santa Marta habrian sido formados en un ambiente colisional, probablemente asociado con la colision del arco del Caribe y la margen continental Suramericana en el Maastrichtiano-Paleogeno.

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Mantle diversity beneath the Mercaderes region, Andean Northern Volcanic Zone, Colombia

Geochimica et Cosmochimica Acta (2003)

Edinei Koester Armindo Rodrigues Rômmulo Vieira Conceição Guilherme Mallmann Koji Kawashita

Xenolith

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PROVENANCE OF OLIGOCENE CONGLOMERATES AND ASSOCIATED SANDSTONES FROM THE SIAMANÁFORMATION, SERRANÍADE JARARA, GUAJIRA, COLOMBIA: IMPLICATIONS FOR OLIGOCENE CARIBBEAN-SOUTH AMERICAN TECTONICS

DOAJ (DOAJ: Directory of Open Access Journals) (2010)

S. Zapata Marion Weber A. Cardona V. Valencia Georgina Guzmán

Analyses of composition and sedimentological attributes of conglomerate clasts together with petrographical and heavy mineral analyses and detrital geochronology from sandstones of the Oligocene Siamana Formation in the Serrania de Jarara, are presented in order to reconstruct de provenance of this sedimentary sequence and contribute to the knowledge of the tectonosedimentary evolution of the Guajira Peninsula and the Caribbean. The results indicate that the source areas are proximal and are located to the southeast. The presence of plutonic igneous and mediumto Lowgrade metamorphic rocks, as well as highpressure metamorphic rocks, indicate that the lithostratigraphic units (Parashi Stock and Jarara Formation) of the Serrania de Jarara and an unidentified unit to the southeast, are the main rock sources. The heavy minerals and the detrital zircon distribution with peaks at approximately 50 Ma, 207Ma, 245 Ma, 463 Ma, 963 Ma and 1044 Ma, confirm that this is the source area. The extremely proximate sources and the rapid burying of the basin, which is evident due to the presence of marine sediments that overlie this sequence, indicate that this siliciclastic unit is related to the initial phases of a pullapart basin. This basin was probably formed as a result of the movement of the Caribbean plate towards the east. The origin of the highpressure clasts is unknown, and is possibly linked to a tectonic melange. The U-Pb ages of approximately 50 Ma and the presence of fragments from the Parashi Stock, suggest exhumation during the Eocene and Upper Oligocene, possibly linked to the formation of the basin.

Echelon formation

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Citations (8)

U‐Pb dating of zircon: A sourcing method for pottery from La Morena archaeological site, north‐west Colombia*

Archaeometry (2019)

Marion Weber V. Valencia Julio Caballero B. Villada A. Cardona

U‐Pb zircon radiometric dating and petrographic thin‐section analysis were used for provenance identification of Ferrería and Marrón Inciso pottery styles from La Morena archaeological site in northwestern Colombia. U‐Pb dating was applied to zircons recovered from pottery and rock samples from nearby geological units. The results suggest at least three distinct sources: the metamorphic rock unit on which the archaeological site is located, a granodiorite unit that outcrops further away from the site, and a mafic rock that cannot be attributed with certainty. U‐Pb in zircons proved to be effective as a provenance method, where ages of the possible source rocks are well constrained, and can be applied to areas where traditional sourcing methods may be problematic.

Outcrop

Radiometric dating

Archaeological Science

10.1111/arcm.12532

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Citations (3)

Geochemistry and Geochronology of the Guajira Eclogites, northern Colombia: evidence of a metamorphosed primitive Cretaceous Caribbean Island-arc

Geologica Acta (2011)

Marion Weber A. Cardona V. Valencia Uwe Altenberger Margarita López‐Martínez

The chemical composition of eclogites, found as boulders in a Tertiary conglomerate from the Guajira Peninsula, Colombia suggests that these rocks are mainly metamorphosed basaltic andesites. They are depleted in LILE elements compared to MORB, have a negative Nb-anomaly and flat to enriched REE patterns, suggesting that their protoliths evolved in a subduction related tectonic setting. They show island-arc affinities and are similar to primitive islandarc rocks described in the Caribbean. The geochemical characteristics are comparable to low-grade greenschists from the nearby Etpana Terrane, which are interpreted as part of a Cretaceous intra-oceanic arc. These data support evidence that the eclogites and the Etpana terrane rocks formed from the same volcano-sedimentary sequence. Part of this sequence was accreted onto the margin and another was incorporated into the subduction channel and metamorphosed at eclogite facies conditions. 40Ar-39Ar ages of 79.2±1.1Ma and 82.2±2.5Ma determined on white micas, separated from two eclogite samples, are interpreted to be related to the cooling of the main metamorphic event. The formation of a common volcano-sedimentary protolith and subsequent metamorphism of these units record the ongoing Late Cretaceous continental subduction of the South American margin within the Caribbean intra-oceanic arc subduction zone. This gave way to an arc-continent collision between the Caribbean and the South American plates, where this sequence was exhumed after the Campanian

Protolith

Geochronology

Island arc

Volcanic arc

10.1344/105.000001740

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Citations (16)