Search results for "Dolomiti"
showing 4 items of 4 documents
Mineralogy and geochemistry of Mesozoic black shales and interbedded carbonates, southeastern Sicily: evaluation of diagenetic processes
1993
AbstractUpper Triassic/Lower Jurassic organic-rich shales and interbedded carbonates (Rhaetian → Sinemurian) are widespread in the subsurface of southeastern Sicily where important oil fields have been found hosted in Triassic reservoirs. Core samples from wells drilled offshore and onshore were studied from petrographie and geochemical viewpoints.In the Hettangian/Sinemurian shale-carbonate sequences, which accumulated in a rapidly subsiding basin, the micritic aragonitic mud is still largely preserved. Mixed-layer I/S has remained randomly interstratified to a depth > 4000 m. Diagenetic carbonates are non-stoichiometric finely crystalline, pore-filling dolomite and/or calcite. The carb…
Dolomitization as an eventualdetermining factor in the colour alteration index (CAI)
1993
Abstract The Colour Alteration Index of conodonts (CAI) is indicative of the degree of alteration of organic material that exists in the interior of the conodonts. This CAI is used ordinarily in the determination of paleotemperatures. More frequent findings of abnormally high CAI values, equivalent to paleotemperatures that are not compatible with temperatures obtained by other more trustworthy methods, has taken us to use values not superior to 6 for the establishment of paleotemperatures. The CAI values measured in specimens proceding from dolostones in the Iberian Range (Spain) show in this way a certain degree of incompatibility with geological data. These anomalous values are the conse…
Ladinia dolomitica
2020
Scopo di questo contributo è offrire una panoramica sull’area che viene usualmente definita “Ladinia dolomitica” e sulla varietà linguistica che vi viene tradizionalmente parlata, il ladino. L'articolo descrive brevemente la storia dell'area e dello sviluppo del ladino, e in seguito descrive le caratteristiche fonologiche, morfologiche, sintattiche e lessicali principali del ladino, che lo distinguono dalle vicine varietà italoromanze. In seguito si illustrano le peculiarità linguistiche dei singoli dialetti ladini, che sono parlati ognuno in una valle diversa delle Dolomiti. L'articolo è fortemente innovativo e originale, perché permette di ascoltare i file audio che esemplificano i tratti…
Dolomīta veidošanās apstākļi perma kaļķakmeņos Kūmu atradnē
2019
Darbā analizēta dolomīta struktūra un izplatība perma kaļķakmeņos Kūmu atradnē, kā arī dolomīta iespējamie veidošanās apstākļi. Pētījumi pamatojas uz lauka darbiem Kūmu karjerā, dolomīta izplatības un struktūras analīzi makroparaugos, plānslīpējumu krāsošanu un aprakstu. Vienam paraugam veikta arī elektronu mikrozondes analīze un rentgendifraktometriskā analīze. Pētījumā secināts, ka dolomitizācija ir skārusi jau litificētu kaļķakmeni. Domājams, ka šo procesu izsauca vēlāka perma Prieglius laikposma evaporītu baseina ūdeņi. Noskaidrots, ka Kūmu ridas kaļķakmeņos vismaz atsevišķos gadījumos ir sastopams minerāls kalcija dolomīts, kas ir uzskatāms par metastabilu starpproduktu dolomitizācijas…