Orogenic andesites and their link to the continental rock cycle

Parolari, Mattia; Gómez-Tuena, Arturo; Errázuriz-Henao, Carlos; Cavazos-Tovar, José G.

doi:10.1016/j.lithos.2020.105958

Cited by 16 publications

(9 citation statements)

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“…In a mélange perspective, on the other hand, the parabolic‐shaped elemental variations displayed by the volcanoes support the notion of a heterogeneous slab flux at the trench that would form compositionally different diapirs (Figure 9). A similar scenario has been recently proposed for the Trans‐Mexican Volcanic Belt, where chemical variations of the tectonically ablated forearc define the along‐strike compositional variations of subduction mélanges feeding large stratovolcanoes (Parolari et al., 2021). In a non‐erosive margin like Colombia, however, mélange compositions are instead controlled by subducted oceanic sediments of different kinds, deposited in the context of evolving spreading centers.…”

Section: Discussionmentioning

confidence: 54%

“…Comparisons like these often apply some sort of filtering to the most primitive constituents (Turner & Langmuir, 2015a), but since volcanoes from the NVP lack parental basaltic magmas and their Mg# remain constantly high across SiO 2 , we have chosen to simply compare their average compositions. This is a straightforward and unbiased method to depict the internal variability of arc volcanic rock‐suites where true liquid lines of descent are either nonexistent or difficult to discern (Chiaradia et al., 2020; Parolari et al., 2021). By using these averages, we observe that volcanoes constructed on the thinnest (CBV, 42 km) and thickest (CMV, 52 km) crustal segments are the most enriched in Pb, Nd, and Hf isotopes, and have lower U‐Th‐K 2 O concentrations and Th(U)/La(K 2 O) ratios than volcanoes emplaced at intermediate crustal thicknesses, whereas the concentrations of Ba systematically increase (Figure 6g).…”

Section: Discussionmentioning

confidence: 99%

“…And yet, a major drawback of all these models is that they rely on a generic or fixed subduction influx, even if this is expected to vary strongly along the entire Cordilleran/Andean chain in terms of both, the eroded forearc crust and the subducted trench sediments (Plank, 2013; Ramos, 2009; Vervoort et al., 2011). Indeed, recent studies have shown that the tectonically ablated forearc crust strongly controls the chemical variability of the Mexican arc (Parolari et al., 2021), whereas subduction of compositionally peculiar sediments from the Eastern Equatorial Pacific plays a key role in the formation of at least some volcanoes of the northernmost Andean chain (Errázuriz‐Henao et al., 2019). These new studies call for a deeper evaluation of the subduction influence into the archetypical Andean chain and other thick‐crusted arc sections.…”

Section: Introductionmentioning

confidence: 99%

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

Errázuriz-Henao

Gómez-Tuena

Parolari

et al. 2021

Geochem Geophys Geosyst

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The biological and sedimentological surface-processes recorded in the compositions of seafloor sediments are transferred to the Earth's interior at convergent margins. These materials can be either recycled into the deep mantle forming long-term compositional heterogeneities (Stracke et al., 2005), or be reworked shallowly into arc magmas giving shape to the continental masses (Behn et al., 2011). While it has been long recognized that subducted sediments exert an important control in the compositions of island arcs (Plank, 2005), less is known about the geochemical imprint of the oceanic realm in thick-crusted continental arc sections. This is because subducting sediments (i.e., GLOSS; Plank, 2013) are compositionally very similar to the overriding continental crust with which ascending magmas may interact, and because forearc subduction erosion may introduce a volumetrically higher crustal influx at most continental margins that could overwhelm the oceanic inputs (Straub et al., 2020).

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Section: Discussionmentioning

confidence: 54%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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

Errázuriz-Henao

Gómez-Tuena

Parolari

et al. 2021

Geochem Geophys Geosyst

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“…These hybrid rocks display a wide range of elemental and isotopic signatures reflecting distinct input lithologies and fluids, but have phase equilibria different from any of the subducted inputs Codillo et al, 2022a;Penniston-Dorland et al, 2014;. It has been suggested that mélanges, in the form of melts or solid diapirs, may play an important role in controlling arc magma chemistry Parolari et al, 2021).…”

Section: Introductionmentioning

confidence: 99%

“…Another line of models (model 2) envisions that physical mixing, metasomatism, and homogenization of subducted materials and overlying serpentinized mantle occurs along the slab-mantle interface , leading to the formation of a mélange zone. This model invokes trace element fractionation through the dehydration and melting of mélange rocks either at the slab-mantle interface or during transport as buoyant diapirs into the hotter mantle wedge Parolari et al, 2021;Straub et al, 2020). The two lines of models result in drastically different geochemical signatures in arc magmas .…”

Section: Introductionmentioning

confidence: 99%

Mass transfer and chemical interactions in subduction zones

Codillo¹

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Subduction zones are important sites of material recycling on Earth, with volatiles playing key roles in mass transfer processes and magma formation. This thesis investigates outstanding questions associated with a continuum of interrelated processes that occur as oceanic plates descend in subduction zones by integrating petrological and geochemical constraints from exhumed high-pressure rocks and erupted arc magmas, high pressure-temperature laboratory experiments, and thermodynamic calculations. Chapters 2 and 3 investigate the fluid-mediated reactions between mafic and ultramafic rocks at conditions relevant to the slab-mantle interface and show that Mg-metasomatism of mafic rocks to form chlorite-rich assemblages is favored and is likely more pervasive in subduction zones than in oceanic settings. Contrary to common belief, talc is unlikely to form in high abundance in ultramafic rocks metasomatized by Si-rich slabderived fluids. This means that talc-rich assemblages formed via Si-metasomatism along the slabmantle interface are less likely to be playing prominent roles in volatile transport, in facilitating slow-slip events, and in controlling the decoupling-coupling transition of the plate interface. Chapter 4 experimentally investigates the phase equilibria, melting, and density evolution of mélange rocks that formed by mixing and fluid-rock interactions. Results show that melting of mélanges is unlikely to occur along slab-tops at pressures ≤ 2.5 GPa. Accordingly, diapirism into the hotter mantle wedge would be required to initiate melting. The density contrast between mélanges and the overlying mantle would allow for buoyancy-driven diapirism at relatively low pressures and melting could subsequently occur in the hotter mantle wedge during ascent. However, diapir buoyancy may be limited at higher pressures due to the formation of abundant garnet especially in mélange rocks with peraluminous composition. Chapter 5 experimentally investigates the compositions of melts and mineral residues from melting of a mantle wedge hybridized with small amounts of mélange rocks to simulate an end-member scenario where solid mélange diapirs dynamically interact with the mantle wedge. Results from laboratory experiments show that melting of a mélange-hybridized mantle wedge can produce melts that display compositional characteristics similar to arc magmas. Finally, Chapter 6 presents new interpretations on the evolution of slab-to-mantle transfer mechanisms from subduction initiation to arc maturity. Analyses of published magma compositions from global arcs reveal that melting of mélange plays an increasingly important role in magma formation as slab-tops cool and arcs mature over time. This trend is attributed to the deepening of the decoupled plate interface during subduction where mélange zones can form more extensively and contribute to the melting process more significantly. Taken together, this thesis highlights (i) the dynamic connection between mechanical mixing of different lithologies and fluid-rock interactions along the slab-mantle interface, (ii) how these processes modify the petrophysical and geochemical properties of subducted materials, and (iii) how these processes collectively influence the mechanisms of slabto-mantle transfer, elemental cycles, and the formation of arc magmas worldwide.

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Ultra-crystalline pyroclastic deposits and rhyolitic lavas controlled by crystal mushes: insights from the Acoculco Caldera Complex, México

Boijseauneau-López,

Sosa-Ceballos,

Farfán

et al. 2023

Contrib Mineral Petrol

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The Acoculco Caldera Complex (ACC), located in eastern Mexico, began its activity during the Pleistocene ~ 2.7 Ma. One of the most relevant and largest rhyolitic eruption in the complex, the Piedras Encimadas Ignimbrite (PEI), occurred during the late post-caldera phase at ~ 1.2 Ma. This ignimbrite is unique with respect to the other caldera products and other contemporaneous ignimbrites in the Trans-Mexican Volcanic Belt (TMVB) because of its ultra-high crystallinity and the absence of pumice fragments. The PEI is made almost entirely of crystals where the main constituents are k-feldspars and silica polymorphs that range from ≤ 5 µm to tens of centimeters in size. XRD on bulk rock, geochemical modeling, FTIR, Raman, and EPMA analyses were carried out in all mineral phases to assess the origin and the causes of high crystallinity within the PEI. We interpret the high crystallinity on the basis of magmatic crystallization of a magma body that was remobilized and altered by post-depositional hydrothermal alteration processes. We suggest that ACC rhyolites are geochemically influenced by at least one crystal mush established during the Pleistocene. We suggest that the PEI could be the result of an erupted crystal mush (melt + crystals), or a cumulate, or an ancient and crystallized reservoir generated after the first ACC collapse due to intrusion or underplating of mafic hot magmas. Extensional episodes within the ACC facilitated the ascent of mafic magmas. This interaction increased the liquid fraction of the mush through partial melting/crystal dissolution, generating a drop in density and viscosity in the mush, thus triggering eruption. The PEI provides evidences for an association between the geochemically-diverse ACC rhyolites with the complex interaction between mafic transitional alkaline magmas and a crustal mush system, promoted by continuous changes in the stress field during the Pleistocene.

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Orogenic andesites and their link to the continental rock cycle

Cited by 16 publications

References 61 publications

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

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

Mass transfer and chemical interactions in subduction zones

Ultra-crystalline pyroclastic deposits and rhyolitic lavas controlled by crystal mushes: insights from the Acoculco Caldera Complex, México

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