atlas de mineralogía de rocas sedimentarias e identificación de sus mineralesDescrição completa
Seminal work on porosity loss and compaction trends in sediment rocks.Full description
Descripción: Geological factors significant in the assessment of rippability
Guia a color de rocas sedimentarias en el campo. Identificación y clasificación de rocas sedimentarias en campo, técnicas de campo, interpretación de ambientes deposicionales, gráficos y tablas de...
FDFull description
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Everything you need to know about Formation of charitable trusts along with requisite documents and procedures.Full description
Petrography
Descrição completa
Descripción completa
Only Table of Contents
Connected forms of Latin words related to amare (adapted from Moreland & Fleischer's Latin: an Intensive Course).
Descrição: a very good book of Sedimentary Petrology
geo;ogi
FORMATION OF SEDIMENTARY ROCKS
SEDIMENTARY ROCKS Sedimentary rocks are derived from the weathered waste products of the preexisting rocks. These rocks form an extensive part of the earth crust and cover about three-four of the contents sedimentary rocks have economic importance for people all over the world. These rocks are contains economically valuable deposits such as coal, petroleum, natural gas, aluminum, iron ore and copper. Sedimentary rocks are generally deposited as beds or strata.
FORMATION These are formed in the following four different Stages. 1. Weathering 2. Transportation 3. Sedimentation/Deposition Sedimentation/Deposition 4. Lithification
1) WEATHERING Igneous sedimentary sedimentary rocks and metamorphic metamorphic rocks are the ultimate source of the sediments of which sedimentary rocks are formed .Under the combined effect of producing weathered weathered material after this the material is ready to be transported to some place of accumulation .Like ocean.
2) TRANSPORTA TRANSPORTATION TION The products of rock weathering are generally transported in large amounts by the running water (rivers) moving ice & wind. Out of these agents, rivers are the most important.
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By: Izhar Mithal Jiskani
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FORMATION OF SEDIMENTARY ROCKS
3) SEDIMENTATION OR DEPOSITION The transportation of the weathered products continuous as long as the velocity of the trans transpor portin ting g me mediu dium m remain remainss unche unchecke cked. d. but when when the produ products cts are are brought at rest into big water bodies like oceans, their deposition will start. The general process by which the rock forming material is laid down is termed as sedimentation
4) LITHIFICATION The process of lithification converts loosely deposited sediments into a rock. This job is generally done in two ways a) Compaction and b) Cementation
A) COMPACTION As the deposition of sediments continuous, it automatically goes on compacting and consolidating due to its own weight with the squeezing out of water e.g. Shale, Silt Stone.
B) CEMENTATION Coarse sediments do not stick together as fine sediments, however they will stick to one another if they are cemented together .Ocean and lake waters contain dissolved minerals such as silica, lime and iron compounds these are natural cement cement.. As they they soak soak into into the the layer layerss of sand sand and gravels gravels,, they they cemen cementt the fragments into rock. The common examples of Sedimentary rocks are limestone, sand stone shale etc. In cementation water carrying mineral matter in solution passes through the sedime sedimenta ntary ry layer layers. s. This This minera minerals ls matter matter crysta crystall llize izess and and holds holds the the layer layerss together like glue.
