Footprints of element mobility during metasomatism linked to a late Miocene peraluminous granite intruding a carbonate host (Campiglia Marittima, Tuscany)

Paoli, Gabriele; Dini, Andréa; Rocchi, Sergio

doi:10.1007/s00531-019-01723-9

Cited by 7 publications

(44 citation statements)

References 43 publications

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“…As reported in reference [1], the BM pluton has a syenogranitic to monzogranitic composition (SiO2 = 68-72 wt %) and a peraluminous character ( Figure 1) [1]. The cordierite-biotite granite is found in a few small outcrops at the BM mine.…”

Section: Geological Petrographic Backgroundmentioning

confidence: 57%

“…However, the data obtained by mineralogical, textural, and geochemical investigation of the granite, endoskarn, and exoskarn bodies allow us to speculate that CO 2 played an important role as a metasomatizing fluid only at the very beginning of metasomatic activity during thermal metamorphism, leading to calcite dissociation before other fluids prevailed on it. Furthermore, our companion study provides evidence for another potential contribution of elements originating from an external source [1], which is manifested by two metasomatic events-the first characterized by circulation of K-rich, then Ca(-Mg)-rich fluids, and the second represented by acidic, F-rich fluids.…”

Section: Introductionmentioning

confidence: 76%

“…The latter is characterized by an intense metasomatic replacement of biotite by phlogopite, Ti-rich minerals, and minor chlorite; (ii) an endoskarn system resulting from the metasomatism of the igneous rock, which is developed along granite joints; (iii) a variety of exoskarns resulting from the metasomatic replacement of the host carbonate (see Figure 1); (iv) the main Campiglia Fe-Cu-Zn-Pb(-Ag) skarn deposit, which consists of several bodies and veins that crop out discontinuously [18]; and (v) minor Sn-W-As bodies which outcrop nearby [18], and are not described in this work. These lithologic types originate from an igneous stage, a potassic-calcic metasomatic episode, and a lower temperature acidic metasomatic stage [1].…”

Section: Geological Petrographic Backgroundmentioning

confidence: 99%

“…Understanding post-magmatic high temperature metasomatic processes of granitic bodies is essential in the investigation of the hydrothermal mobility of metals. Indeed, these processes trigger the formation of valuable metasomatic deposits of rare earth element (REE) and various other co-existing trace metals (Cu, Zn, Zr, Ni, Mo, Sb, and Tl) [1]. Metasomatic minerals that incorporate these elements are important geochemical indicators that can provide significant information about the nature and source of the metasomatizing fluids [2][3][4].…”

Section: Introductionmentioning

confidence: 99%

“…According to reference [1], the wide variety of calc-silicates (diopside, titanite, vesuvianite, garnet, and epidote group minerals) formed during the first metasomatic event, together with the mineral disequilibrium features developed during the second, acidic event (pseudomorphs, patchy zoning, dissolution/reprecipitation textures), make Campiglia igneous-hydrothermal complex a prominent case study in which to investigate the evolution of fluids and element mobility resulting from the metasomatism of a peraluminous granite. In this study, we combine (i) detailed mineralogical and textural investigations, (ii) whole-rock and mineral geochemical analysis, and (iii) in situ trace element determinations, which allow us to infer the elemental transfer mechanism during metasomatic processes.…”

Section: Introductionmentioning

confidence: 99%

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HFSE-REE Transfer Mechanisms During Metasomatism of a Late Miocene Peraluminous Granite Intruding a Carbonate Host (Campiglia Marittima, Tuscany)

et al. 2019

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The different generations of calc‐silicate assemblages formed during sequential metasomatic events make the Campiglia Marittima magmatic–hydrothermal system a prominent case study to investigate the mobility of rare earth element (REE) and other trace elements. These mineralogical assemblages also provide information about the nature and source of metasomatizing fluids. Petrographic and geochemical investigations of granite, endoskarn, and exoskarn bodies provide evidence for the contribution of metasomatizing fluids from an external source. The granitic pluton underwent intense metasomatism during post‐magmatic fluid–rock interaction processes. The system was initially affected by a metasomatic event characterized by circulation of K‐rich and Ca(‐Mg)‐rich fluids. A potassic metasomatic event led to the complete replacement of magmatic biotite, plagioclase, and ilmenite, promoting major element mobilization and crystallization of K‐feldspar, phlogopite, chlorite, titanite, and rutile. The process resulted in significant gain of K, Rb, Ba, and Sr, accompanied by loss of Fe and Na, with metals such as Cu, Zn, Sn, W, and Tl showing significant mobility. Concurrently, the increasing fluid acidity, due to interaction with Ca‐rich fluids, resulted in a diffuse Ca‐metasomatism. During this stage, a wide variety of calc‐silicates formed (diopside, titanite, vesuvianite, garnet, and allanite), throughout the granite body, along granite joints, and at the carbonate–granite contact. In the following stage, Ca‐F‐rich fluids triggered the acidic metasomatism of accessory minerals and the mobilization of high-field-strength elements (HFSE) and REE. This stage is characterized by the exchange of major elements (Ti, Ca, Fe, Al) with HFSE and REE in the forming metasomatic minerals (i.e., titanite, vesuvianite) and the crystallization of HFSE‐REE minerals. Moreover, the observed textural disequilibrium of newly formed minerals (pseudomorphs, patchy zoning, dissolution/reprecipitation textures) suggests the evolution of metasomatizing fluids towards more acidic conditions at lower temperatures. In summary, the selective mobilization of chemical components was related to a shift in fluid composition, pH, and temperature. This study emphasizes the importance of relating field studies and petrographic observations to detailed mineral compositions, leading to the construction of litho‐geochemical models for element mobilization in crustal magmatic‐hydrothermal settings.

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Section: Geological Petrographic Backgroundmentioning

confidence: 57%

Section: Introductionmentioning

confidence: 76%

Section: Geological Petrographic Backgroundmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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HFSE-REE Transfer Mechanisms During Metasomatism of a Late Miocene Peraluminous Granite Intruding a Carbonate Host (Campiglia Marittima, Tuscany)

et al. 2019

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Snake-shaped carbonate folds replaced by skarn (Campiglia Marittima, Italy)

Tinagli

Paoli

Vezzoni

2020

Int J Earth Sci (Geol Rundsch)

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Transmission-Based Muography for Ore Bodies Prospecting: A Case Study from a Skarn Complex in Italy

et al. 2023

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Transmission-based muography (TM) is an innovative imaging technique based on the measurement and analysis of the cosmic ray muons flux attenuation within the target under investigation. This technique allows imaging inner-body density differences and has successfully been applied in a wide range of research fields: geology, archaeology, engineering geology and civil engineering. The aim of this study is to show the reliability of TM as an innovative, noninvasive geophysical method for ore body prospecting and other mining related studies. The measurements were carried out at the Temperino mine in the San Silvestro Archaeological and Mining Park (Campiglia Marittima, Italy), where several magmatic and metasomatic geological units are embodied. Among them, a Cu–Fe–Zn–Pb(–Ag) sulfide skarn complex primarily composed by hedenbergite and ilvaite minerals. Using the acquired muon imaging data obtained with the MIMA (Muon Imaging for Mining and Archaeology) detector prototype (cubic detector of 0.5 × 0.5 × 0.5 m3), the presence of a high-density vein inside the skarn body within the rock volume above the muon detector was identified, localized and interpreted. Applying a back-projection algorithm to the obtained 2D transmission map made it possible to estimate and visualize as point cloud data, in a 2D or 3D environment, the identified high-density body and its relative distance from the detector. The results of this study highlight the potential of muography as a support tool to other geophysical methods in the field of mining exploration.

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Footprints of element mobility during metasomatism linked to a late Miocene peraluminous granite intruding a carbonate host (Campiglia Marittima, Tuscany)

Cited by 7 publications

References 43 publications

HFSE-REE Transfer Mechanisms During Metasomatism of a Late Miocene Peraluminous Granite Intruding a Carbonate Host (Campiglia Marittima, Tuscany)

HFSE-REE Transfer Mechanisms During Metasomatism of a Late Miocene Peraluminous Granite Intruding a Carbonate Host (Campiglia Marittima, Tuscany)

Snake-shaped carbonate folds replaced by skarn (Campiglia Marittima, Italy)

Transmission-Based Muography for Ore Bodies Prospecting: A Case Study from a Skarn Complex in Italy

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