Isotopic constraints on contamination processes in the Tonian Goiás Stratiform Complex

Giovanardi, Tommaso; Mazzucchelli, Maurizio; Lugli, Federico; Girardi, Vicente Antônio Vitório; Correia, Ciro Teixeira; Tassinari, Colombo Celso Gaeta; Cipriani, Anna

doi:10.1016/j.lithos.2018.04.008

Cited by 13 publications

(4 citation statements)

References 55 publications

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“…In situ trace element analyses were determined by laser ablation inductively coupled plasma mass spectrometry (LA-ICP-MS) using a 213 nm Nd:YAG laser ablation system (NewWave Research) coupled to a quadrupole ICP-MS system (Thermo Fisher Scientific X-Series II) housed at the Centro Interdipartimentale Grandi Strumenti (CIGS) of the University of Modena and Reggio Emilia. Carbonate specimens were analysed using a laser spot size of 80 µm, a frequency of 10 Hz, a fluence of c. 6 J cm −2 and a He flux of 0.6 l min −1 (Sforna and Lugli 2017; Giovanardi et al 2018). Prior to each analysis, the sample surface was carefully pre-ablated to remove possible contaminants.…”

Section: Sampling and Analytical Methodsmentioning

confidence: 99%

Cyclical variations of fluid sources and stress state in a shallow megathrust-zone mélange

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Mittempergher

et al. 2020

JGS

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Differences in REE patterns of calcite from extensional and shear veins of the Sestola Vidiciatico Tectonic Unit in the Northern Apennines suggest variations in fluid source during the seismic cycle in an ancient analogue of a shallow megathrust ( T max c . 100–150°C). In shear veins, a positive Eu anomaly suggests an exotic fluid source, probably hotter than the fault environment. Small-scale extensional veins were derived instead from a local fluid in equilibrium with the fault rocks. Mutually crosscutting relations between two extensional vein sets, parallel and perpendicular to the megathrust, suggest repeated shifting of the σ 1 and σ 3 stresses during the seismic cycle. This is consistent with: (1) a seismic phase, with brittle failure along the thrust, crystallization of shear veins from an exotic fluid, stress drop and stress rotation; (2) a post-seismic phase, with fault-normal compaction and formation of fault-normal extensional veins fed by local fluids; (3) a reloading phase, where shear stress and pore pressure are gradually restored and fault-parallel extensional veins form, until the thrust fails again. The combination of geochemical and structural analyses in veins from exhumed megathrust analogues represents a promising tool to better understand the interplay between stress state and fluids in modern subduction zones. Supplementary material: Cathodoluminescence microphotographs, methodological details of the microstructural analysis, microphotographs of the location of analysed spots and a geochemical data table are available at https://doi.org/10.6084/m9.figshare.c.4842165 Thematic collection: This article is part of the Polygenetic mélanges collection available at: https://www.lyellcollection.org/cc/polygenetic-melanges

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Section: Sampling and Analytical Methodsmentioning

confidence: 99%

Cyclical variations of fluid sources and stress state in a shallow megathrust-zone mélange

Cerchiari

Remitti

Mittempergher

et al. 2020

JGS

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“…Then, a single hair per strand was glued on a Teflon disk using high‐purity carbon tape. In situ analyses were run on a quadrupole ICP‐MS (X‐Series II , Thermo Fisher Scientific) coupled to a 213 nm Nd:YAG laser ablation system (New Wave Up) housed at the CIGS UNIMORE (see Giovanardi et al, ), employing 1,500 μm‐long linear scans with a spot size of 30 μm, a scan speed of 10 μm/s, and a laser energy output of approximately 8 J/cm 2 . Elemental intensities were normalized to 34 S. We quantified the absolute elemental concentrations (ppm) of the hair specimens using a pressed pellet of CAAS Sulphide‐Ore 1 as reference material (Sine, Taylor, Webber, & Lewis, ).…”

Section: Methodsmentioning

confidence: 99%

Transhumance pastoralism of Roccapelago (Modena, Italy) early‐modern individuals: Inferences from Sr isotopes of hair strands

Lugli

Cipriani

Tavaglione

et al. 2018

American J Phys Anthropol

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The variable modern human hair Sr/ Sr ratios show that high-resolution hair sampling tracks the movements of this individual between the two continents. The Sr isotope composition of the mummy hair is consistent with sub-annual human movements from Roccapelago to an area with different Sr/ Sr ratios. Historical sources indicate that individuals from Roccapelago travelled with their herds to Tuscany for transhumance pastoralism practices. The high radiogenic Sr/ Sr ratios (>0.71) found in some of the hair are possibly consistent with the Tuscan Magmatic Province and the Tuscan Metamorphic Complex isotope signature. To our knowledge, this is the first study in an archaeological context where the Sr isotope evidence of mobility is corroborated by historical documents.

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“…Eleven selected samples, representing all the Sàrrabus lithologies were analyzed for Sr and Nd A low laser frequency (~10 Hz) was used to achieve better signal stability with a He flux of ~0.5 L/min. Details of the method are reported in Giovanardi et al (2018). Data reduction was performed using the Hf-INATOR software (Giovanardi and Lugli, 2017).…”

Section: Methodsmentioning

confidence: 99%

Multiple crustal and mantle inputs in post-collisional magmatism: Evidence from late-Variscan Sàrrabus pluton (SE Sardinia, Italy)

Secchi

Giovanardi

Naitza

et al. 2022

Lithos

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Isotopic constraints on contamination processes in the Tonian Goiás Stratiform Complex

Cited by 13 publications

References 55 publications

Cyclical variations of fluid sources and stress state in a shallow megathrust-zone mélange

Cyclical variations of fluid sources and stress state in a shallow megathrust-zone mélange

Transhumance pastoralism of Roccapelago (Modena, Italy) early‐modern individuals: Inferences from Sr isotopes of hair strands

Multiple crustal and mantle inputs in post-collisional magmatism: Evidence from late-Variscan Sàrrabus pluton (SE Sardinia, Italy)

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