Residual sedimentary rocks

Residual sedimentary rocks Detritic or terrigeneous rocks 

Sediments are commonly subdivided into three types  

This category of sedimentary rocks comprises rocks formed by the degradation materials located near or at the site of weathering of pre-existing rocks. It consists mainly of the degradation products depleted by the leaching action of water i.e., the removal of soluble cations (e.g., Na, K, Ca, Mg) leaving insoluble cations such as iron and aluminum associated 

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Residual (Granite) soil Residual (Sedimentary rock) soil Coastal/river alluvium... 

Bauxite is the major source of aluminum sesquioxide alumina, Al Oj) worldwide. Bauxite is a soft and red clay, rich in alumina, and its name originates from Les Baux de Provence, a small vihage located in the region of Arles in southeastern France, where it was first discovered in 1821 by P. Berthier. From a geological point of view bauxite is defined as a residual sedimentary rock in the laterite family that results from in situ superficial weathering in... 

The early period of the Earth s history, around 3.8 1 billion years ago, is completely shrouded in darkness possible witnesses from this archaic period might help to cast some light. So we are looking for possible remains of the first primitive life forms on our planet—fossils, or to be exact, microfossils, which refers to the remains of living cells. What have survived are mainly only cell walls, which can be isolated from sedimentary rocks when the silicate-, sulphide- or carbonate-rich minerals are chemically dissolved away. The microfossils are found in the remaining carbon-containing residue, transparently thin platelets of which are prepared for microscopic studies. 

Organic sedimentary rocks rocks containing organic material such as residues of plant and animal remains/decay. 

The first attempt on the determination of intensive mobility was undertaken by K.H. Smith in 1913. He dealt not with migration forms but with individual elements. He compared weight concentrations of the elements in dry residue of river water and of igneous or sedimentary rocks based on the data by Frank Wiglesworth Clarke (1847-1931). The macro-component contents were expressed in the form of oxides (Table 3.2). He compared the obtained differences with the difference in CaO oxide and as a result identified a series of most mobile metals in groxmd water composition. K.H. Smith did not include in the series the most mobile element, chlorine. 

Illite Sedimentary rocks a) From muscovite or biotite by leaching of potassium ions b) From montmorillonite by adsorption of potassium ions c) As neoformation from weathering solutions To muscovite/ biotite, to chlorite in marine environments (by addition of magnesium ions) or brines Either residual or neoformation... 

Chlorite group Igneous, metamorphic and sedimentary rocks a) Leaching of biotite, hornblende b) Neoformation after deposition c) Very low- to low-grade metamorphosis To smectites and vermiculite Residual or neoformation in sediments... 

The breakdown and transformation of the plant and animal residues embedded in sedimentary rocks have formed natural gas and mineral oil. Hydrogen sulfide formed in these processes is included especially in natural gas but also in mineral oil. This has been an important source for large-scale sulfur manufacture. In Canada, the world s leading sulfur producer in 2001, natural gas has been obtained with more than 30% hydrogen sulfide. The majority of the sulfur production in Canada that year came from natural gas plants in Alberta. 

A large part of the uranium in igneous rocks is contained in heavy chemically resistant minerals the weathering of which is mainly mechanical. Thus, uranium in such form is transported by rivers and streams as clastic particles that are ultimately found in residual soils, in stream sediments and in common sedimentary rocks, either continental or marine. From the viewpoint of ore deposits the previously mentioned particles may accumulate in placer deposits. 

Deposits also contain non-volatile residuals that constitute the ash. These include alkali and alkaline earth metals, together with the constituents of silts and clays that commonly occur in sedimentary rocks (Si, A1 and Fe present as oxides, hydroxides, carbonates). 

Barite [13462-86-7], natural barium sulfate, BaSO, commonly known as barytes, and sometimes as heavy spar, tiU, or cawk, occurs in many geological environments in sedimentary, igneous, and metamorphic rocks. Commercial deposits are of three types vein and cavity filling deposits residual deposits and bedded deposits. Most commercial sources are replacement deposits in limestone, dolomitic sandstone, and shales, or residual deposits caused by differential weathering that result in lumps of barite enclosed in clay. Barite is widely distributed and has minable deposits in many countries. 

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