The NW Amazonian Craton in Guainía and Vaupés departments, Colombia: Evidence of a Mesoproterozoic thermal event from apatite LA-ICP-MS U-Pb geochronology and its relation to continental rifting

Bonilla, Amed; Victoria, Jose Alejandro Franco; Cramer, Thomas; Grave, Johan De; Nachtergaele, Simon; Cogné, Nathan; Piraquive, Alejandro

doi:10.1016/j.precamres.2023.107148

Cited by 4 publications

(10 citation statements)

References 53 publications

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“…This duration exceeds the conventional (<1 to 5 Ma) and maximum (10 to 15 Ma) span associated with a single LIP event (49). Notably, volcanic activity during 1.40 to 1.39 Ga has also been reported from other cratons, including the South Laurentian, West Australian, North Australian, Amazonian, and South African (table S1) (50)(51)(52)(53)(54)(55). Despite uncertainties concerning the paleogeographic reconstruction, available evidence indicates that these cratons and the North China Craton were not adjacent to each other during 1.55 to 1.25 Ga (fig.…”

Section: Subaerial Volcanic Eruptions 1398 Ma Agomentioning

confidence: 79%

“…The drivers of enhanced subaerial volcanic activity are still under debate. Because of their occurrence being mostly related to large-scale continental rifting and breakup of Columbia (Nuna) supercontinent ( 53 , 55 ), it could be related to interior superplume activities and/or encircling subduction systems ( 78 ). Nevertheless, our results emphasize that subaerial volcanism and its corresponding effect on weathering can break the long-term stasis of the mid-Proterozoic.…”

Section: Discussionmentioning

confidence: 99%

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Subaerial volcanism broke mid-Proterozoic environmental stasis

Zhang,

Wang,

Wang

et al. 2024

Sci. Adv.

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The mid-Proterozoic, spanning 1.8 to 0.8 billion years ago, is recognized as a phase of marine anoxia, low marine primary productivity (MPP), and constrained eukaryotic biodiversity. However, emerging evidence suggesting intermittent environmental disturbances and concurrent eukaryotic evolution challenges the notion of a stagnant Earth during this era. We present a study detailing volcanic activity and its consequential impact on terrestrial weathering and MPP, elucidated through the examination of 1.4-billion-year-old tropical offshore sediments. Our investigation, leveraging precise mercury (Hg) and lithium (Li) isotopic analyses, reveals the introduction of fresh rock substrates by local volcanism. This geological event initiated a transformative process, shifting the initial regolith-dominated condition in tropical lowland to a regime of enhanced chemical weathering and denudation efficiency. Notably, the heightened influx of nutrient-rich volcanic derivatives, especially phosphorus, spurred MPP rates and heightened organic carbon burial. These factors emerge as potential drivers in breaking the long-term static state of the mid-Proterozoic.

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Section: Subaerial Volcanic Eruptions 1398 Ma Agomentioning

confidence: 79%

Section: Discussionmentioning

confidence: 99%

Subaerial volcanism broke mid-Proterozoic environmental stasis

Zhang,

Wang,

Wang

et al. 2024

Sci. Adv.

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“…The first occurred between 1.55-1.40 Ga, followed by the second stage between 1.40-1.34 Ga. These events were associated with ore deposits of incompatible elements, including Nb, Ta, REE, and U (Bonilla et al 2023).…”

Section: Figure 1 Geochronological Provinces In the Amazon Craton Reg...mentioning

confidence: 98%

“…Accordingly, Franco et al (2021b) analyzed colluvial REE, Nb-Ta, and U-Th bearing minerals in the Guainía Department (pegmatite-related) and concluded their relationship with intra-plate processes that produced anorogenic granites between 1.55 and 1.30 Ga, which can be related to plume activity. Furthermore, various reports of post-orogenic to anoregenic rocks in the vicinity of the study area have been made, several of which report the presence of strategic minerals (Bonilla et al, 2021;Bonilla et al, 2023;Cordani et al, 2016;Franco et al, 2021a;Franco et al, 2021b). Consequently, the studied rocks can be related to anorogenic intrusion events in the NW portion of the Rio Negro-Juruena Province such as that of the Matraca Granite or the Parguaza anoregenic event as reported for similar and neighboring igneous bodies (Aarden & Davidson, 1978;Bangerter, 1985;Bonilla-Perez et al, 2013;Bonilla et al, 2021;Bonilla et al, 2023;Franco et al, 2021a;Franco et al, 2021b;Gaudette et al, 1978;Gonzalez & Pinto, 1990;Rodriguez & Perez, 1982).…”

Section: Parental Magmamentioning

confidence: 99%

Genesis and Evolution of Pegmatites in Eastern Colombia: Insights from Mineral Chemistry

Mora-Galindo,

Molano Mendoza,

Morales Peña

2023

Earth sci. res. j.

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Pegmatites and granitic intrusives from eastern Colombia, belonging to the Guainía department, were studied to determine the generating magma type, as well as to assess the degree of magmatic fractionation and its relationship with the presence of Nb-Ta-bearing minerals (strategic minerals). To that end, 31 rock samples were studied; EPMA electronic microprobe analyses were conducted on apatite, biotite, garnet, microcline, muscovite, and tourmaline. The results from biotite, garnet, and tourmaline suggest that these rocks originated from a Fe-rich peraluminous melt. Moreover, content variation of Ba in microcline, Na in muscovite, Fe-Mg in biotite, and Mn-Sr in apatite, allowed the proposal of a magmatic evolutionary line for these rocks. Nb-Ta-bearing samples were present in the most fractionated rocks where tourmaline and garnet occurred, and thus, were proposed as possible indicators of strategic minerals.

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“…CC BY 4.0 License. granitoids, and Mesoproterozoic (1.40-1.34 Ga) anorogenic magmatism (Teixeira et al, 1989;Tassinari and Macambira, 1999;Cordani et al, 2016;Bonilla et al, 2021Bonilla et al, , 2023. During the Jurassic to the early Cretaceous, the belt delimited the Llanos and Putumayo-Oriente-Maranon basins that were evolving as a back-arc rifting zone (Fig.…”

mentioning

confidence: 99%

Extensional exhumation of cratons: insights from the Early Cretaceous Rio Negro-Juruena belt (Amazonian Craton, Colombia)

Fonseca,

Nachtergaele,

Bonilla

et al. 2023

Preprint

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Abstract. This study presents results from apatite fission track (AFT) thermochronology to investigate the thermal history and exhumation dynamics of the Rio Negro-Juruena basement, situated within the western Guiana Shield of the Amazonian Craton. AFT dating and associated thermal history modelling in South America has largely been restricted to the plate’s margins (e.g. Andean active margin, Brazilian passive margin and others). Our paper reports on low-temperature thermochronological data from the internal part of the western Guiana Shield for the first time. This area is part of a vast cratonic lithosphere that is generally thought to be stable and little influenced by Mesozoic and Cenozoic tectonics. Our data however show AFT central ages ranging from 79.1 ± 3.2 Ma to 177.1 ± 14.8 Ma with mean confined track lengths of ca. 12 µm. Contrary to what might be expected of stable cratonic shields, inverse thermal history modeling indicates a rapid basement cooling event in the early Cretaceous. This cooling is interpreted as a significant exhumation event of the basement that was likely driven by the coeval extensional tectonics associated with back-arc rifts in the Llanos and Putumayo-Oriente-Maranon basins. The extensional tectonics facilitated both basement uplift and subsidence of the adjoining basins, increasing erosional dynamics and consequent exhumation of the basement rocks. The tectonic setting shifted in the late Cretaceous from extensional to contractional, resulting in reduced subsidence of the basins and consequential diminishing cooling rates of the Guiana Shield basement. Throughout the Cenozoic, only gradual, slow subsidence occurred in the study area due to regional flexure linked to the Andean orogeny. Comparative analysis with low-temperature thermochronology data from other West Gondwana cratonic segments highlights that exhumation episodes are highly controlled by tectonic inheritance, lithospheric strength, and proximity to rift zones. This study underscores the complex interplay between tectonic events and the response of cratonic lithosphere over geological time scales and highlights extensional settings as an important geological context for craton exhumation.

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The NW Amazonian Craton in Guainía and Vaupés departments, Colombia: Evidence of a Mesoproterozoic thermal event from apatite LA-ICP-MS U-Pb geochronology and its relation to continental rifting

Cited by 4 publications

References 53 publications

Subaerial volcanism broke mid-Proterozoic environmental stasis

Subaerial volcanism broke mid-Proterozoic environmental stasis

Genesis and Evolution of Pegmatites in Eastern Colombia: Insights from Mineral Chemistry

Extensional exhumation of cratons: insights from the Early Cretaceous Rio Negro-Juruena belt (Amazonian Craton, Colombia)

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