101 research outputs found
Proterozoic dykes of Salvador and Ilhéus-Olivença areas: a geological geoghemical comparison
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Minimum Information about T Regulatory Cells: A Step toward Reproducibility and Standardization
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Oxygen isotopic composition of lower Cretaceous tholeiites and Precambrian basement rocks from the Paranà basin (Brazil): the role of water rock interaction
No full textGeological geophysical and geochemical constraints on the Mesozoic-Tertiary magmatism in eastern Paraguay
No full textGeochemical and isotopic features of Ferrar magmatic Province (Victoria Land, Antarctica)
No full textDistinct magma pulses in the Ferrar tholeiites of Thern Promontory (Victoria Land, Antarctica).
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Crystal chemistry and significance of cation ordering in Mg-Al rich spinels from high-grade hornfels (Predazzo-Monzoni, NE Italy)
No full textTwo Mg-Al spinels (FAS1 and FAS2) in high-grade hornfels from the Toal de Mason skarn (Predazzo Monzoni, NE Italy) were investigated by means of single crystal X-ray diffraction and electron
microprobe analysis in order to evaluate the last intra-crystalline closure temperature. The evidence provided by crystal chemical data from the investigated spinels, compared with that for two other spinels from a websterite dyke and a chlorite schist (TS2 and SP78a, respectively) with similar chemical characteristics, yielded a new empirical geothermometer. This allowed estimation of intra-crystalline temperatures as low as c. 4008C and indicates that the closure temperature of FAS1 and FAS2 is c. 5008C, i.e. 150\uff2008C lower than the spinel crystallisation temperature
Petrogenesis and tectonic significance of the late-Proterozoic unmetamorphosed mafic dyke swarms from the Salvador Area (NE Brazil)
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