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Estratigrafía de las rocas metasedimentarias (Neoproterozoico-Cámbrico) de la Sierra de Mojotoro, Cordillera Oriental Argentina
Published 2010-12-01“…<br>The basement of Argentine Eastern Cordillera is an heterogeneous succession of siliciclastic and chemical rocks of Neoproterozoic-Early Cambrian age, identified as the "Precambrian basement" (Keidel, 1910) underlying with angular unconformity the Cambrian and Ordovician deposits of the Mesón and Santa Victoria Groups. …”
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1282
Provenance, protolith and metamorphic ages of jadeite-bearing orthogneiss and host paragneiss at Tavagnasco, the Sesia Zone, Lower Aosta Valley, Italy
Published 2023-08-01“…The cores have <span class="inline-formula"><math xmlns="http://www.w3.org/1998/Math/MathML" id="M19" display="inline" overflow="scroll" dspmath="mathml"><mrow class="chem"><mi mathvariant="normal">Th</mi><mo>/</mo><mi mathvariant="normal">U</mi></mrow></math><span><svg:svg xmlns:svg="http://www.w3.org/2000/svg" width="29pt" height="14pt" class="svg-formula" dspmath="mathimg" md5hash="66336532033b9fae90efac8c3cb90ed2"><svg:image xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="ejm-35-645-2023-ie00002.svg" width="29pt" height="14pt" src="ejm-35-645-2023-ie00002.png"/></svg:svg></span></span> <span class="inline-formula">=</span> 0.1 and negative Eu anomalies indicative of an igneous protolith, which we interpret to have crystallized in the Ordovician at 780 <span class="inline-formula"><sup>∘</sup></span>C, based on Ti-in-zircon measurements. …”
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1283
Complex <sup>40</sup>Ar ∕ <sup>39</sup>Ar age spectra from low-grade metamorphic rocks: resolving the input of detrital and metamorphic components in a case study fro...
Published 2022-07-01“…<p>In this study, we provide <span class="inline-formula"><sup>40</sup></span>Ar <span class="inline-formula"><math xmlns="http://www.w3.org/1998/Math/MathML" id="M8" display="inline" overflow="scroll" dspmath="mathml"><mo>/</mo></math><span><svg:svg xmlns:svg="http://www.w3.org/2000/svg" width="8pt" height="14pt" class="svg-formula" dspmath="mathimg" md5hash="fb147fccdcf98a9911cf3d26a8f6dc33"><svg:image xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="gchron-4-471-2022-ie00004.svg" width="8pt" height="14pt" src="gchron-4-471-2022-ie00004.png"/></svg:svg></span></span> <span class="inline-formula"><sup>39</sup></span>Ar geochronology data from a suite of variably deformed rocks from a region of low-grade metamorphism within the Cambro–Ordovician Delamerian Orogen, South Australia. Low-grade metamorphic rocks such as these can contain both detrital minerals and minerals newly grown or partly recrystallised during diagenesis and metamorphism. …”
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