Engineering Geology

In: Computers and Technology

Submitted By wanjiku
Words 554
Pages 3
Assignment
SGL 407: Engineering geology
I13/0134/2010

Diorite
This is a grey to dark grey intermediate intrusive igneous rock. It occurs in association with either granite or gabbro intrusions.
Diorite results from partial melting of mafic rock above a subduction zone. The extrusive equivalent rock type is andesite
Diorites in Kenya are found in kakamega dome area, mt. Kenya region, mutito Andei area, matuu-masinga areas in central Kenya and along the Kenyan rift (bogoria region)
Quartzite
Quartzite is a quartz-rich metamorphic rock, often formed from quartz rich sandstone. The quartz crystals are typically much more tightly interlocked in the quartzite, and the quartzite is more compact, denser, and stronger rock than the original sandstone.
Quartzites are found in the Mozambique belt which consists largely of metamorphic rocks. In Kenya they are found to occur mainly in the eastern province that is Kitui county, Machakos county and Mbeere area in Embu
Evaporates
These are chemical sediments basically formed by chemical processes usually from direct precipitation of solutions
They are actually minerals but since they have extensive impurities they are referred to as rocks. Evaporite rocks show ancient conditions of extensive evaporation. Examples of these include;
Gypsum deposits (CaSO4.2H2o), anhydrite (CaSO4), and rock salt (Nacl)
They occur in Lake Magadi area and Kajiado in Kenya

Conglomerate and breccias
These are clastic sedimentary rocks formed from the products of the mechanical break up of other rocks. They are coarse grained.
Conglomerate is a coarse-grained rock with fragments above 2mm in diameter, and sometimes larger. Most of the grains are rounded
Breccias are similar to conglomerates in size but most of the clasts fragments are angular
They are found mostly in stream courses or dry river beds. In Kenya, they occur in…...

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