saprolite वाक्य
उदाहरण वाक्य
मोबाइल
- Often the spheroidal weathering, which created these corestones and the enclosing saprolite occurred in the prehistoric past during periods of humid, even tropical climates.
- When saprolite is exposed by physical erosion, these concentric layers peel ( spall ) off as concentric shells much like the layers of a peeled onion.
- Saprolite ( from Greek ?????? = putrid + ????? = rock ) is a chemically weathered rock ( literally, it means " rotten rock " ).
- Within saprolite, spheroidal weathering often creates rounded boulders, known as " corestones " or " woolsack ", of relatively unweathered rock.
- In the Australian deposits, chrysoprase occurs as veins and nodules with brown goethite and other iron oxides in the magnesite-rich saprolite below an iron and silica cap.
- For instance, earthquakes in the region can cause cracks in the hard, upper layer of laterite, which allows water to seep into the more porous layer of saprolite underneath.
- This led to severe chemical weathering of the granite to saprolite rich in kaolin clays, decomposed from the large visible crystals of potassium feldspar that are so conspicuous in the granite.
- Pedology; A is the topsoil; B is a regolith; C is a saprolite, a less-weathered regolith; the bottom-most layer represents the bedrock . ]]
- Among the natural controls on lavaka formation are the amount of seismic activity in the region, the topographic relief ( or slope ), and hydraulic conductivity of materials in the saprolite.
- Soil layers, from soil down to bedrock : A represents soil; B represents laterite, a regolith; C represents saprolite, a less-weathered regolith; below C is bedrock
- Nickel mineralisation in the regolith, in the upper saprolite typically exists as goethite, hematite, limonite and is often associated with polydymite and violarite, nickel sulfides which are of supergene association.
- Frequently, the removal of the saprolite by erosion and exposure of corestones as freestanding residual boulders, tors, or other landforms occurs many thousands of years later and during vastly different climatic conditions.
- The DNi process has the major advantage of being able to treat both limonite and saprolite lateritic ores and is estimated to have less than half the capital and operating costs of HPAL or FerroNickel processes.
- These in turn are currently undergoing erosion by a combination of aeolian and fluvial processes, forming extensive sand dune systems, deep and prolonged development of laterite and saprolite profiles, and development of playa lakes, salt lakes and ephemeral drainage.
- "' Spheroidal weathering "'is a form of chemical weathering that affects jointed bedrock and results in the formation of concentric or spherical layers of highly decayed rock within weathered bedrock that is known as " saprolite ."
- This causes chemical reactions within the saprolite to leech certain minerals from the rock and if the hydraulic conductivity of that rock is high enough, the water can carry those minerals away, which can cause the infrastructure of that rock to collapse and erode.
- Often called " weathered granite ", saprolite is the result of weathering processes that include : hydrolysis, chelation from organic compounds, hydration ( the solution of minerals in water with resulting cation and anion pairs ) and physical processes that include freezing and thawing.
- Sulfides are some of the most unstable minerals in humid, oxidizing environments; many cadmium, cobalt, copper, molybdenum, nickel and zinc sulfides are easily leached to deep in the profile . reprecipitate with secondary iron-manganese oxides in the mid-to lower saprolite.
- Saprolites form in the lower zones of soil horizons In lateritic regoliths & ndash; regoliths are the loose layer of rocks that rest on the bedrock & ndash; saprolite may be overlain by upper horizons of residual laterite; most of the original profile is preserved by residual soils or transported overburden.
- Saprolites form in the lower zones of soil horizons In lateritic regoliths & ndash; regoliths are the loose layer of rocks that rest on the bedrock & ndash; saprolite may be overlain by upper horizons of residual laterite; most of the original profile is preserved by residual soils or transported overburden.
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