1 / 20

Geosciences

Geosciences. 17/09/2019. The  Solar System  is the gravitationally bound system of the Sun and the objects that orbit it, either directly or indirectly. Inner S olar S ystem: terrestrial planets and asteroid belt Outer Solar system : the giant planets.

mknowles
Télécharger la présentation

Geosciences

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Geosciences 17/09/2019

  2. The Solar System is thegravitationallyboundsystem of the Sun and the objects that orbit it, either directly or indirectly. InnerSolarSystem: terrestrialplanets and asteroidbelt OuterSolarsystem: the giantplanets

  3. Evolution of the Solar System • NebularhypothesisSwedenborg, Kant, Laplace • 4.5 billionyearsago – gravitationalcollapse of a small part of a giantmolecularcloud. • Most of the masscollectedinthe center - Sun; • The rest flattenedintoprotoplanetarydisc- planets, moons, asteroids, etc. • Moonsmayhaveformedfromcyclingdiscs of gas and dustaroundparentplanets, or • Independently and capturedlater, or • Giantscollisionalsomayformedsome of the moons (e.g. our Moon) • Planetarymigration: the positions of the planetsmighthave shifted duetogravitationalinteraction. • .

  4. Nearlysphericalshape. • The average diameter of the reference spheroid is 12,742 kilometres. • The Earthmass is omposedmostly Fe (32.1%), O (30.1%), Si(15.1%), Mg (13.9%), S (2.9%), Ni (1.8%), Ca (1.5%), Al (1.4%); otherelementsrepresentthe remaining 1.2% .

  5. The Earth’s crust • Mohorovičićdiscontinuity • Oceaniccrust: 5km to 10 km thick; composed primarily of denser rocks, such asbasaltand gabbro (3.0 and 3.25 g/cm3); • Continentalcrust: 30 km to 50 km thick and mostly composed of less denserocks, such asgranite(2.69 and 2.74 g/cm3)

  6. MINERAL is a • naturallyoccuring • crystallinesolidwith a • definitechemicalcomposition. • Naturallyoccuring, i.e. it is formedwithout human actionorintervention, butitmay be biotic (biomineralization). • Crystallinesolids, butsomemineralsareamorphous (mineraloids). • Definitechemicalcomposition, butit is notnecessarily fixed.

  7. Classification of minerals Accordingto the geologicalprocessesthatcreatesminerals Geneticclassification IgneousSedimentaryMetamorphic(BiogeneAnthropic)

  8. Chemicalclassification Elements Sulphides Halides Oxides, hydroxides Carbonates and nitrates Borates Sulphates Phosphates Silicates Organicminerals

  9. 1. Elements NATIVE GOLD Au Valuedforitsbeauty, and as an industrialmaterialduetoitsexcellentelectricalconductivity; NATIVE SILVER Ag Valuedforitsbeauty, usedinjewelry, tableware, coinage, and inelectronicsapplication. NATIVE SULPHUR S Mainlyusedformanufacturingsulphuricacid.

  10. GRAPHITE C „Leads” of pencils, , brakepadsforautomobils, electricalresistors, etc. DIAMOND C Extremelydesirablegemstone; forindustrialpurposesit is usedincuttingtools and as an abrasive and polishingmaterial.

  11. 2. Sulphides GALENA PbS Most importantrowmaterialforproducingplumbum. CHALCOPYRITE CuFeS2 Most importantmineralforcopperproduction.

  12. 3. Halides HALITE NaCl Foodindustry, chemicalindustry, etc. SYLVITE KCl Useinfertilizertoprovidepotassium.

  13. 4. Oxides, hydroxides MAGNETITE Fe3O4 One of the most importantironore. HEMATITE Fe2O3 Importantore of iron.

  14. LIMONITE FeO(OH)nH2O (mixture of hydratediron(III) oxide-hydroxides Amorphous, mineraloid, Importantironore.

  15. 4. Carbonates, nitrates Calcite CaCO3 Importantrawmaterialinmanufacture of portland cement, quick lime. It is major constituent of marble. DOLOMITE CaMg(CO3)2 Dolomite is minedforglassmaking, metallurgicalfluxing, etc.

  16. NITRATINE NaNO3 Importantsource of nitrateforfertilizes, and usedinchemicalindustry. 6. Borates

  17. 7. Sulphates ANHYDRITE CaSO4 Mainlyusedassoilamendment. GYPSUM CaSO42H2O Gypsum is mainlyusedin building industry (gypsumwallboardordrywall).

  18. BARITE BaSO4 Principalmineralforproducingbarium, and usedinmakingglass, radiation-shielding cement, ceramics; moreoverit is usedascontrastmaterialingastrointestinalX-rayinvestigation.

  19. 8. Phosphates APATITE Ca5(PO4)3(F, Cl, OH) Source of phosphateusedinfertilizer and otherindustrialpurposes. 9. Silicates 10. Organicminerals

  20. THANK YOU FOR YOUR ATTENTION!

More Related