نتایج جستجو برای: detrital series sandstones
تعداد نتایج: 354376 فیلتر نتایج به سال:
The petrography, as well as major and trace element (including rare earth element) compositions of 10 sandstone samples from the Late Proterozoic Buem Structural Unit, southeast Ghana, have been investigated to determine their provenance and tectonic setting. The petrographic analysis has revealed that the sandstones are quartz-rich and were primarily derived from granitic and metamorphic basem...
Sediment gravity flows transport large volumes of sand and clay minerals into submarine systems, which store some the world's major reserves oil gas. However, knowledge about grain-coating mineral formation its role in preserving reservoir quality deep marine settings is poorly documented. Here we present a case study on Agat Formation, deposit interpreted as series turbidites, using multimetho...
U–Pb age and Lu–Hf signatures of detrital zircon from Palaeozoic sandstones in the Oslo Rift, Norway
Most of the potential sandstone reservoirs within Namurian and lower Westphalian succession Southern North Sea Basin are originally feldspathic sands in which feldspar has mainly been altered to microporous kaolinite clays. The sandstones provide a moderate porosity (typically 8‐15%, depending on grain size), but permeability is severely limited owing nature much porosity. Permeability typicall...
We describe an extensive ichnofossil assemblage from the likely Cenomanian-age 'lower' and 'upper' units of the 'Kem Kem beds' in southeastern Morocco. In the lower unit, trace fossils include narrow vertical burrows in cross-bedded sandstones and borings in dinosaur bone, with the latter identified as the insect ichnotaxon Cubiculum ornatus. In the upper unit, several horizons preserve abundan...
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