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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Geochemistry of Platinum-Group Elements (PGE) in Cerro Matoso and Planeta Rica Ni-Laterite deposits, Northern Colombia

Boletín de la Sociedad Geológica Mexicana (2020)

Mónica Tobón Marion Weber Joaquín A. Proenza Thomas Aiglsperger Sebastián Betancur

Platinum-group elements (PGE) are included among the so-called critical metals, and are essential metals for the technological industry. However, there are very few deposits in the world from which these metals can be extracted. The present work investigates three Ni-laterite profiles (hydrous Mg silicate type) formed over the ultramafic rocks of Cerro Matoso and Planeta Rica in Colombia. The main goal is to determine their PGE concentration and distribution, as well as to identify the carrier phases of these noble metals. The highest PGE contents in Cerro Matoso and Planeta Rica are concentrated in the limonite horizon (141–272 ppb), showing a strong decrease towards the saprolite and the underlying serpentinized peridotite (parent rock; < 50 ppb). The highest concentrations correspond to Pt>Ru>Pd and the lowest to Rh<Os<Ir. Such distribution indicates that PGE are mobilized in different proportions by the laterization processes. The high affinity between PGE and Fe favors the formation of PGE-Fe mineral alloys such as the Pt-Ir-Fe-Ni minerals hosted by Fe-oxyhydroxide found in the limonite–saprolite transition zone in Planeta Rica. In addition, in the same zone, nanoparticles of Pt (< 1 µm) were found within framboidal pyrite. Both types of platinum group minerals (PGM) are secondary in origin. In the case of Pt-Ir-Fe-Ni alloys, this interpretation is supported by their morphology and chemical composition, which is comparable with PGE-Fe-Ni alloys found in laterites of Dominican Republic. In the case of Pt nanoparticle, textural relations suggest the neoformation of PGM adhered to the porous edges of altered pyrite. Cerro Matoso and Planeta Rica should be considered as unconventional PGE deposits, if adequate recovery processes can be applied for their recovery as by-products during Ni (+Co) production.

Platinum group

Limonite

Saprolite

Laterite

Ultramafic rock

Peridotite

Almandine

10.18268/bsgm2020v72n3a201219

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Citations (10)

Mantle diversity beneath the Colombian Andes, Northern Volcanic Zone: Constraints from Sr and Nd isotopes

Lithos (2005)

Andrés Rodríguez-Vargas Edinei Koester Guilherme Mallmann Rômmulo Vieira Conceição Koji Kawashita

Xenolith

Peridotite

Primitive mantle

10.1016/j.lithos.2004.09.027

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Citations (31)

QUIMICA MINERAL DE LAS ROCAS DE ALTA PRESION-FACIES ECLOGITA, DE LA PENINSULA DE LA GUAJIRA, COLOMBIA

Boletín de Geología (2007)

Marion Weber A. Cardona Robert N. Wilson Juan A. Gómez Gilberto Zapata

RESUMEN Las rocas de alta presion encontradas en la Peninsula de La Guajira, comprenden principalmente eclogitas con la paragenesis pico: onfacita + granate + cuarzo + rutilo + mica blanca ± cianita y metapelitas con la paragenesis pico: cuarzo + mica blanca + granate + cianita + rutilo ± apatito. Estas rocas muestran evidencias de una compleja historia de evolucion tectonica: 1) Una primera fase de crecimiento progrado en dos fases, a traves de la facies anfibolita, hasta alcanzar la paragenesis pico; 2) un evento de hidratacion que permitio la formacion local de glaucofana orientada; 3) un evento no bien diferenciado que sucede en condiciones estaticas que permite la formacion de clinozoisita; y 4) la retrogradacion de estas rocas en facies anfibolita. La asociacion de metamafitas y rocas de procedencia continental sugieren una relacion con un prisma de acrecion que se genero durante la subduccion cretacica de la placa Caribe y el acercamiento de un posible fragmento continental o de la margen continental Suramericana a la placa del Caribe. Palabras Clave: Eclogitas, metapelitas, placa Caribe, quimica mineral MINERAL CHEMISTRY OF HIGH PRESSURE ECLOGITE-FACIES ROCKS, FROM THE GUAJIRA PENINSULA, COLOMBIA ABSTRACT The high pressure rocks found in the Guajira Peninsula, comprise mainly eclogites with the peak metamorphic paragenesis: omphacite + garnet + quartz + white mica ± kyanite and metapelites with the peak metamorphic paragenesis: quartz + white mica + garnet + kyanite + rutile ± apatite. These rocks register a complex history of tectonic evolution: 1) Prograde growth in two stages, through amphibolite facies, reaching the peak metamorphic paragenesis; 2) hydration of these rocks that enabled galucophane to grow locally; 3) a later not well characterized event that happened in static conditions shown by the growth of clinozoisite; 4) retrogression through amphibolite-facies. The association of eclogites with continental rocks suggest their link to an accretionary prism that was generated during the Cretaceous subduction of the Caribbean plate and the bringing together of a possible continental fragment or the South American continental margin and the Caribbean plate. Key words : Eclogites, metapelites, Caribbean plate, mineral chemistry

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Citations (7)

Provenance study of the variscite artifacts of the Sierra Nevada de Santa Marta, Colombia and approach to routes of pre-Hispanic exchange

Journal of Archaeological Science (2021)

Natalia Acevedo Marion Weber Joaquín A. Proenza Antonio García‐Casco Juanita Sáenz-Samper

10.1016/j.jas.2021.105511

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Citations (6)

Integrated Seismic Study of Weathering in Hawaiian Volcanic Flows

AGUFM (2012)

Johnathan R. Yaede S. J. Nelson J. A. Flores Marion Weber Stephen J. Turnbull

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PROVENANCE OF OLIGOCENE CONGLOMERATES AND ASSOCIATED SANDSTONES FROM THE SIAMANÁ FORMATION, SERRANÍA DE JARARA, GUAJIRA, COLOMBIA: IMPLICATIONS FOR OLIGOCENE CARIBBEANSOUTH AMERICAN TECTONICS PROVENIENCIA DE ARENISCAS Y CONGLOMERADOS OLIGOCENOS PERTENECIENTES A LA FORMACION SIAMANÁ, SERRANÍA DE JARARA, GUAJIRA, COLOMBIA: IMPLICACIONES EN LA TECTÓNICA OLIGOCENA DEL CARIBE Y SUR AMERICA

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 medium to 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 UPb 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.

Conglomerate

Siliciclastic

Geochronology

Heavy mineral

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Mantle-hosted ophiolitic chromitites from Colombia: implications for petrogenesis and geodynamic evolution

Figshare (2023)

Carlos A. Ramírez-Cárdenas Núria Pujol-Solà Joaquín A. Proenza Marion Weber Montgarri Castillo-Oliver

Chromitite bodies can be found within ophiolitic mantle sections in three locations in Colombia: Medellín, Planeta Rica, and La Guajira. These chromitites are typically massive pods that are often surrounded by lateritic soil in Medellín and Planeta Rica, or small discoidal bodies in La Guajira. Inclusions in chromite are preserved to varying degrees in the three localities: olivine and pargasite are partially preserved in Medellín and Planeta Rica, whereas inclusions in La Guajira chromitites are completely altered to chlorite. Compositionally, chromite from the chromitites is high-Al in Medellín (Cr#[Cr/(Cr+Al) atomic ratio] = 0.41–0.51) and Planeta Rica (Cr# = 0.49–0.57), and high-Cr in La Guajira (Cr# = 0.75–0.76), whereas TiO₂ contents are low in the three localities (0.12–0.43 wt%). Regarding trace elements composition, the chromitites are similar to others formed in supra-subduction zone settings; the chromite from the high-Al chromitites is similar to that in MORB/BABB, whereas chromite from the high-Cr chromitites has a strong boninitic affinity. Chromitites from Planeta Rica are richer in Ti, possibly due to the presence of nearby gabbroic bodies and impregnated peridotites. The alteration in chromite rims and silicate matrix is related to metamorphic processes. Bulk-rock platinum-group element (PGE) contents range from 30 to 487 ppb, and chondrite-normalized PGE patterns show the typical enrichment in IPGE relative to PPGE observed in most ophiolitic chromitites. The estimated melts in equilibrium with the different chromitites correspond to MORB-like melts for the Medellín and Planeta Rica chromitites and to boninites for La Guajira chromitites. However, the estimated TiO₂ content in the melt is too low for a typical MORB, indicating back-arc basin basalts and a back-arc setting for the formation of the Medellín and Planeta Rica chromitites during the Late Triassic and the Late Jurassic, respectively. La Guajira chromitites are interpreted to have formed in a fore-arc basin related to subduction-initiation during Cretaceous times.

Petrogenesis

Chromitite

10.6084/m9.figshare.23578053

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Crustal make-up of the northern Andes: evidence based on deep crustal xenolith suites, Mercaderes, SW Colombia

Tectonophysics (2002)

Marion Weber J. Tarney Pamela D. Kempton R. W. Kent

Xenolith

Silicic

Hornblende

Felsic

Underplating

Batholith

10.1016/s0040-1951(01)00206-2

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Citations (89)

The upper mantle in the Eifel Plume region

EGS - AGU - EUG Joint Assembly (2003)

Martin Budweg Marion Weber G. Bock

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San José de Guaviare Syenite, Colombia: Repeated Ediacaran intrusions in the northwestern Amazonian Craton

Boletín Geológico (2021)

Carolina Amaya-López Marion Weber Mauricio Ibáñez-Mejía Federico Alberto Cuadros Jiménez Jorge Julián Restrepo

The Neoproterozoic igneous rocks found in the municipality of San José del Guaviare include several isolated plutonic bodies that protrude from the Phanerozoic sedimentary cover in belts aligned NW-SE. Limited to the Guaviare department, these intrusions stretch from the La Lindosa mountain range to the corregimiento El Capricho. These plutonic bodies consist of nepheline syenites, nepheline monzosyenites, nepheline-bearing alkali-feldspar syenites, syenites, quartz-syenites, quartz-alkali-feldspar syenites, syenogranites, and quartz-rich granitoids, which have been grouped and termed the San José del Guaviare Syenite unit (SJGS). The intrusion of the unit occurred in the Ediacaran (604 ± 7 Ma and 620.5 ± 7.5 Ma) by mantle-derived alkaline magmas formed in anorogenic settings, most likely in rift-like stretching zones. The silica-subsaturated magma may have reacted with host rocks at the crust level, producing some silica-saturated igneous rocks, such as syenogranites and quartz-syenites, which are found in the El Capricho and Cerritos bodies.

10.32685/0120-1425/bol.geol.48.1.2021.503

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Citations (4)