Guilherme Sonntag Hoerlle

Universidade Federal do Rio Grande do Sul

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Marcus Vinícius Dorneles Remus

Universidade Federal do Rio Grande do Sul

Norberto Dani

Universidade Federal do Rio Grande do Sul

Cristiano Lana

Universidade Federal de Ouro Preto

Daniel da Rosa Madruga

Sandra Piazolo

University of Leeds

Kelvyn Mikael Vaccari Ruppel

Universidade Federal do Rio Grande do Sul

Ariela Mazoz

Universidade de Brasília

Thomas Müller

University of Leeds

Dominik Sorger

University of Göttingen

Henrique de Mamam Anzolin

Universidade Federal do Rio Grande do Sul

Cooperative Institutions

Universidade Federal do Rio Grande do Sul

Instituto de Geociencias

Universidade Federal do Rio Grande

Universidade Federal de Ouro Preto

University of Rio Grande and Rio Grande Community College

National Council for Scientific and Technological Development

Universidade Federal de Minas Gerais

University of Leeds

Universidade de Brasília

University of Göttingen

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Detrital Zircon and Tourmaline Unravel Provenance and Polycyclic Origin of Cretaceous Tupanciretã Subbasin, South Brazil

Kelvyn Mikael Vaccari Ruppel Norberto Dani Marcus Vinícius Dorneles Remus Guilherme Sonntag Hoerlle Cristiano Lana

The recognition and evaluation of polycyclic processes in sedimentary units are critical for proper provenance analysis and sedimentary system interpretation. The chemical composition and textural maturity of detrital tourmalines and zircons allow for source area restriction and transport and deposition process identification. This study investigates the origin and history of post-Gondwanan sediments of the Tupanciretã Formation in southern Brazil, which lacks provenance studies. The Tupanciretã Formation is in a similar setting of the Bauru Supersequence at the uppermost portion of the Paraná Basin. Detrital zircon ages indicate sediment provenance from the Transamazonian, Grenvillian, and Brasiliano orogenic cycles of the Rio Grande do Sul Shield and younger grains (280-128 Ma) record contribution from the Choiyoi and Serra Geral igneous events, with a maximum deposition age of 127 Ma. Detrital tourmaline chemical analyses points to the Sul-riograndense Shield as the ultimate source, with metapelitic, metapsamitic and granitic origins. The predominant degrees of roundness are well rounded to rounded suggest evidence of sediment recycling from sedimentary units of the Paraná Basin, with important aeolian reworking involved. Zircon U-Pb signatures are compatible with the eastern sector of the Botucatu Formation in Rio Grande do Sul as the immediate source and the northeastern Sul-riograndense Shield as the ultimate source. Intermediate sources between the Sul-riograndense Shield and the Tupanciretã Formation were Gondwanan sedimentary units of the Paraná Basin, with possible participation from the Camaquã Basin.

Tourmaline

10.2139/ssrn.4530691

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Extensive two-tier structure and breccia stockwork formation by hydrothermal processes in the first Paraná lava flow covering the Botucatu paleoerg-turned-Guarani Paleoaquifer

Journal of South American Earth Sciences (2023)

Léo Afrâneo Hartmann Guilherme Sonntag Hoerlle Leonardo Cardoso Renner

Stockwork

Breccia

Felsic

Dacite

10.1016/j.jsames.2023.104734

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Citations (2)

Detrital zircon and tourmaline unravel polycyclic provenance of sedimentary infill of the Cretaceous Tupanciretã formation, southern Brazil

Journal of South American Earth Sciences (2023)

Kelvyn Mikael Vaccari Ruppel Norberto Dani Marcus Vinícius Dorneles Remus Guilherme Sonntag Hoerlle Cristiano Lana

Heavy mineral

10.1016/j.jsames.2023.104677

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Metamafic dyke and sill swarms in the Dom Feliciano Belt: Insights for post-collisional strike-slip tectonics and fluid-assisted metamorphism

Precambrian Research (2022)

Guilherme Sonntag Hoerlle Marcus Vinícius Dorneles Remus Norberto Dani

Greenschist

Sill

10.1016/j.precamres.2022.106906

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Citations (8)

Metasomatic Reactions Triggered by Localized and Episodic Fluid Flux Record Multistage Intrusion History: An Example from the Syntectonic Caçapava Do Sul Granitic Complex, Southern Brazil

SSRN Electronic Journal (2022)

Guilherme Sonntag Hoerlle Marcus Vinícius Dorneles Remus Thomas Müller Sandra Piazolo Cristiano Lana

In this study we report field, microstructural and geochronological evidence for multistage localized and episodic fluid flux associated with the syntectonic intrusion of the Caçapava do Sul Granitic Complex into the dolomitic marbles of the Passo Feio Metamorphic Complex (Dom Feliciano Belt, southern Brazil). The marbles were intruded by mafic and felsic intrusions from 578 to 557 Ma, which triggered a set of metasomatic reactions in the host and intrusive rocks at three stages. Calcsilicate rocks replacing the dolomites, i.e., skarns, and calcite-chlorite-sulfide veins were formed at different stages of the pluton assembly. These metasomatic lithologies were formed in response to fluid infiltration derived from igneous apophyses into the host rocks. Hence, they represent useful indicators of the pathways used by the magmatic fluids when infiltrating the dolomitic marbles. The first metasomatic stage resulted in the formation of diopside skarns. They were formed in restricted areas at lithological boundaries and along pre-existing foliation planes within the host rocks suggesting spatially limited infiltration of fluids released from M1 mafic and felsic apophyses during an extensional regime. A second stage of metasomatism is recorded by the synkinematic formation of forsterite skarns during transpression triggered by H2O-rich fluids derived from the cooling of M2 felsic apophyses. Zircon U-Pb age of c. 578 Ma obtained for a M2 felsic apophysis directly associated to forsterite skarns defines the age of the second metasomatic stage. Heat supply from repeated sheeted intrusions and transpression resulted in pinch-and-swell and boudin structures of the former diopside skarns together with deformation and metamorphism of the prior M1 mafic-felsic apophyses. The fluid pathways, recorded by reaction textures of forsterite skarns, were localized and characterized by heterogeneous flow along lithological boundaries, through diopside-skarn boudin and pinch-and-swell structures as well as structurally controlled focused flow in fold hinges and axial planes of the M1 apophyses. Fluid flux in the first two stages was highly localized and at high temperatures (~500 to 600°C) in which the changes of the skarn assemblages were controlled by either variable fluid fluxes or constant flux and variable physicochemical conditions of the fluid phase (e.g., silica activity, temperature). The third stage is mainly characterized by serpentinization of previous skarn silicate assemblages, chloritization of mafic and felsic apophyses and formation of calcite-chlorite-sulfide veins and breccias at ~300°C. The fluid flow regime at this stage was controlled by the porosity and permeability created due to brittle fracturing related to the cooling of the granitic complex. Apatite and titanite from different mafic apophyses record consistent U-Pb ages of c. 557 Ma that mark the thermal effect of the last igneous intrusions and subsequent cooling of the Caçapava do Sul Granitic Complex. Our study shows that the metasomatic reactions commonly observed in the host rocks and apophyses of a magmatic complex provide useful insights on timing of the pluton assembly, deformation and associated fluid activity.

Metasomatism

Felsic

Anatexis

10.2139/ssrn.4139084

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Metasomatic reactions triggered by localized and dynamically evolving fluid flux record multistage intrusion history: An example from the syntectonic Caçapava do Sul Granitic Complex, Southern Brazil

Lithos (2023)

Guilherme Sonntag Hoerlle Marcus Vinícius Dorneles Remus Thomas Müller Sandra Piazolo Cristiano Lana

Metasomatism

Felsic

10.1016/j.lithos.2023.107103

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Citations (2)

Evolution of fluorite-mica-feldspar veins: Evidences of a fossil geothermal system in the são Gabriel terrane and consequences for Pb-Zn-Cu metallogeny

Journal of South American Earth Sciences (2019)

Guilherme Sonntag Hoerlle Marcus Vinícius Dorneles Remus Norberto Dani Márcia Elisa Boscato Gomes Luíz Henrique Ronchi

Sericite

Cassiterite

Fluorite

Wolframite

Topaz

Arsenopyrite

Metallogeny

Molybdenite

10.1016/j.jsames.2019.03.006

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Citations (8)

Titanite, Apatite and Zircon Track Polymetamorphism of Calc-Silicate Rocks from 644 to 565 Ma in the Dom Feliciano Belt (South Brazil): Insights and Challenges for Titanite Petrochronolgy

Daniel da Rosa Madruga Marcus Vinícius Dorneles Remus Guilherme Sonntag Hoerlle Cristiano Lana Norberto Dani

Titanite is a valuable tool for studying polymetamorphism and understanding the evolution of orogenic belts as it potentially records different stages of metamorphic evolution. The combination of geochronology and Zr-in-titanite geothermometry has been widely used in petrochronology studies. However, there is ongoing debate regarding the significance of ages and temperatures obtained from titanite. Here, we conducted the first integrated titanite, zircon, and apatite U-Pb study, along with Zr-in-titanite geothermometry, on calc-silicate rocks from a polymetamorphic complex of the central Dom Feliciano Belt. Our aim was to investigate the impact of various metamorphic events on titanite grains. We carried out a geochronological, geochemical, and petrographic analysis of a calc-silicate sequence of the Passo Feio Complex, which was intruded by the Caçapava do Sul Granitic Complex. The metamorphic complex experienced regional, contact, and hydrothermal metamorphism during the Neoproterozoic, but the ages and conditions of these metamorphic events remain widely debated. U-Pb analyses on over one hundred titanite grains from a K-feldspar-diopside schist revealed three distinct titanite populations. The older populations yielded ages from 644 to 619 Ma and average temperatures between 640 and 660 °C, respectively. These were attributed to the regional metamorphism (M1) event caused by the main collisional event of the Dom Feliciano Belt. A second population yielded an age of ca. 588 Ma and average temperatures of 630 °C. Zircons from a syenogranite intrusion within the calc-silicate sequence revealed an age of ca. 582 Ma. Hence, the second population was interpreted to be associated with the contact metamorphism (M2) caused by the intrusion of the Caçapava do Sul Granitic Complex. The third and smallest titanite population yielded an age of 565.5±3.4 Ma that overlaps within the analytical uncertainty the age of 569.5±5.2 Ma obtained from U-Pb dating of apatite grains. The younger ages recorded both in titanite and apatite are attributed to modifications caused by hydrothermal fluid flow (M3) during the cooling of the granitic complex. However, we note that the high temperatures (~660 °C) obtained in the younger titanite grains are not consistent with the temperature of the hydrothermal event. Therefore, it is important to carefully consider Zr-in-titanite temperatures in polymetamorphic rocks, as hydrothermal events may alter U-Pb ratios while preserving Zr contents that correspond to prior higher temperature events. We conclude that titanites have the potential to record different events of a metamorphic complex, even though Zr-in-titanite temperatures may be decoupled from U-Pb ages, especially when affected by hydrothermal alteration. Therefore, combining ages obtained in titanite with other datable phases such as zircon and apatite can provide a more comprehensive understanding of the evolution of orogenic belts.

Titanite

10.2139/ssrn.4499966

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Unraveling the polymetamorphism of calc-silicate rocks from 638 to 565 Ma in the Western Gondwana (Passo Feio Complex, Dom Feliciano Belt, South Brazil) based on U-Pb dating in titanite, apatite and zircon

Lithos (2024)

Daniel da Rosa Madruga Marcus Vinícius Dorneles Remus Guilherme Sonntag Hoerlle Ariela Mazoz Cristiano Lana

Titanite

10.1016/j.lithos.2024.107822

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Titanite, Apatite and Zircon Track Polymetamorphism of Calc-Silicate Rocks from 638 to 565 Ma in the Western Gondwana (South Brazil): Insights and Challenges for Titanite Petrochronology

Daniel da Rosa Madruga Marcus Vinícius Dorneles Remus Guilherme Sonntag Hoerlle Ariela Mazoz Cristiano Lana

Titanite is a valuable tool for studying polymetamorphism and understanding the evolution of orogenic belts as it potentially records different stages of metamorphic evolution. The combination of geochronology and Zr-in-titanite geothermometry has been widely used in petrochronology studies. However, there is ongoing debate regarding the significance of ages and temperatures obtained from titanite. Here, we conducted the first integrated titanite, zircon, and apatite U-Pb study, along with Zr-in-titanite geothermometry, on calc-silicate rocks from a polymetamorphic complex of the central Dom Feliciano Belt (Western Gondwana). Our aim was to investigate the impact of various metamorphic events on titanite grains. We carried out a geochronological, geochemical, and petrographic analysis of a calc-silicate sequence of the Passo Feio Complex, which was intruded by the Caçapava do Sul Granitic Complex. The metamorphic complex experienced regional, contact, and hydrothermal metamorphism during the Neoproterozoic, but the ages and conditions of these metamorphic events remain widely debated. U-Pb analyses on over one hundred titanite grains from a K-feldspar-diopside schist revealed three distinct titanite populations. The older population yielded an age of 638.6±2.8 Ma and average temperature of 705°C. These were attributed to the regional metamorphism (M1) event caused by the main collisional event of the Dom Feliciano Belt (Western Gondwana). A second population yielded an age of ca. 596.3±1.1 Ma and average temperatures of 688 °C. Zircons from a syenogranite intrusion within the calc-silicate sequence revealed an age of ca. 582 Ma. Hence, the second population was interpreted to be associated with the contact metamorphism (M2) caused by the intrusion of post-collisional granitoids, shoshonitic affinity volcanism and carbonatite emplacement. The third and smallest titanite population yielded an age of 565.7±3.0 Ma that overlaps within the analytical uncertainty the age of 561.4±1.3 Ma obtained from U-Pb dating of apatite grains. The younger ages recorded both in titanite and apatite are attributed to modifications caused by hydrothermal fluid flow (M3) during the cooling of the granitic complex. However, we note that the high temperatures (~700 °C) obtained in the younger titanite grains are not consistent with the temperature of the hydrothermal event. Therefore, it is important to carefully consider Zr-in-titanite temperatures in polymetamorphic rocks, as hydrothermal events may alter U-Pb ratios while preserving Zr contents that correspond to prior higher temperature events. We conclude that titanites have the potential to record different events of a metamorphic complex, even though Zr-in-titanite temperatures may be decoupled from U-Pb ages, especially when affected by hydrothermal alteration. Therefore, combining ages obtained in titanite with other datable phases such as zircon and apatite can provide a more comprehensive understanding of the evolution of orogenic belts.

Titanite

Geochronology

10.2139/ssrn.4697294

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