Chemical Weathering. I. Introduction Chemical Weathering I. Introduction II. Process of...

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Chemical Weathering

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Transcript of Chemical Weathering. I. Introduction Chemical Weathering I. Introduction II. Process of...

Page 1: Chemical Weathering. I. Introduction Chemical Weathering I. Introduction II. Process of Decomposition A. Overview: Decomposition alters minerals into.

Chemical Weathering

Page 2: Chemical Weathering. I. Introduction Chemical Weathering I. Introduction II. Process of Decomposition A. Overview: Decomposition alters minerals into.

Chemical Weathering

Page 3: Chemical Weathering. I. Introduction Chemical Weathering I. Introduction II. Process of Decomposition A. Overview: Decomposition alters minerals into.

Chemical Weathering 

I. Introduction  

Page 4: Chemical Weathering. I. Introduction Chemical Weathering I. Introduction II. Process of Decomposition A. Overview: Decomposition alters minerals into.

Chemical Weathering 

I. Introduction II. Process of Decomposition A. Overview:

Decomposition alters minerals into more stable minerals or substances at the earth’s surface.

Page 5: Chemical Weathering. I. Introduction Chemical Weathering I. Introduction II. Process of Decomposition A. Overview: Decomposition alters minerals into.

Chemical Weathering 

I. Introduction II. Process of Decomposition A. Overview: B. Oxidation and Reduction

Page 6: Chemical Weathering. I. Introduction Chemical Weathering I. Introduction II. Process of Decomposition A. Overview: Decomposition alters minerals into.

Chemical Weathering 

I. Introduction II. Process of Decomposition A. Overview: B. Oxidation and Reduction

an element loses electrons to an Oxygen ion

Page 7: Chemical Weathering. I. Introduction Chemical Weathering I. Introduction II. Process of Decomposition A. Overview: Decomposition alters minerals into.

Chemical Weathering 

I. Introduction II. Process of Decomposition A. Overview: B. Oxidation and Reduction

an element loses electrons to an Oxygen ion

2Fe2++ 4HCO3 -1 + 1/2O2 + 2H20 >>>> Fe2O3 + 4H2CO3

Page 8: Chemical Weathering. I. Introduction Chemical Weathering I. Introduction II. Process of Decomposition A. Overview: Decomposition alters minerals into.

Chemical Weathering 

I. Introduction II. Process of Decomposition A. Overview: B. Oxidation and Reduction

an element loses electrons to an Oxygen ion

2Fe2++ 4HCO3 -1 + 1/2O2 + 2H20 >>>> Fe2O3 + 4H2CO3

Ferrous bicarbonate ferric carbonic acid Iron Iron

Page 9: Chemical Weathering. I. Introduction Chemical Weathering I. Introduction II. Process of Decomposition A. Overview: Decomposition alters minerals into.

Chemical Weathering 

I. Introduction II. Process of Decomposition A. Overview: B. Oxidation and Reduction C. Solution

Page 10: Chemical Weathering. I. Introduction Chemical Weathering I. Introduction II. Process of Decomposition A. Overview: Decomposition alters minerals into.

Chemical Weathering 

I. Introduction II. Process of Decomposition A. Overview: B. Oxidation and Reduction C. Solution

The process of chemical weathering by which earth material passes into solution by removal of its atoms.

Page 11: Chemical Weathering. I. Introduction Chemical Weathering I. Introduction II. Process of Decomposition A. Overview: Decomposition alters minerals into.

Chemical Weathering 

I. Introduction II. Process of Decomposition A. Overview: B. Oxidation and Reduction C. Solution

The process of chemical weathering by which earth material passes into solution by removal of its atoms.

Most well-known:

CO2 + H2O = H2CO3

Carbon dioxide water carbonic acid

Page 12: Chemical Weathering. I. Introduction Chemical Weathering I. Introduction II. Process of Decomposition A. Overview: Decomposition alters minerals into.

Chemical Weathering 

I. Introduction II. Process of Decomposition A. Overview: B. Oxidation and Reduction C. Solution

The process of chemical weathering by which earth material passes into solution by removal of its atoms.

Most well-known:

CO2 + H2O = H2CO3

Carbon dioxide water carbonic acid

CaCO3 + H2CO3 = Ca+ + HCO3-

Limestone + carbonic acid = calcium ions + bicarbonate

Page 13: Chemical Weathering. I. Introduction Chemical Weathering I. Introduction II. Process of Decomposition A. Overview: Decomposition alters minerals into.

Chemical Weathering 

I. Introduction II. Process of Decomposition A. Overview: B. Oxidation and Reduction C. Solution

The process of chemical weathering by which earth material passes into solution by removal of its atoms.

Most well-known: Limestone + water + carbonic acid = calcium ions + CO2 + bicarbonate

pH controls solubility….

Page 14: Chemical Weathering. I. Introduction Chemical Weathering I. Introduction II. Process of Decomposition A. Overview: Decomposition alters minerals into.

Chemical Weathering 

I. Introduction II. Process of Decomposition A. Overview: B. Oxidation and Reduction C. Solution D. Hydrolysis

Describes the reaction between minerals and hydrogen“converting primary minerals into secondary minerals”

Page 15: Chemical Weathering. I. Introduction Chemical Weathering I. Introduction II. Process of Decomposition A. Overview: Decomposition alters minerals into.

Chemical Weathering 

I. Introduction II. Process of Decomposition A. Overview: B. Oxidation and Reduction C. Solution D. Hydrolysis

Describes the reaction between minerals and hydrogen“converting primary minerals into secondary minerals” 2 KAlSi3O8 + 2H+ + 9H2O >>>> H4Al2Si2O9 + 4H4SiO4 + 2K+

orthoclase kaolinite silica acid

Page 16: Chemical Weathering. I. Introduction Chemical Weathering I. Introduction II. Process of Decomposition A. Overview: Decomposition alters minerals into.

Chemical Weathering 

I. Introduction II. Process of Decomposition A. Overview: B. Oxidation and Reduction C. Solution D. Hydrolysis E. Ion Exchange

involves the substitution of ions in solution for those held by mineral grains.

 

Page 17: Chemical Weathering. I. Introduction Chemical Weathering I. Introduction II. Process of Decomposition A. Overview: Decomposition alters minerals into.

Cation exchange capacity (CEC): the capability for absorbing cations

“High Base Saturation”…..the % of exchange sites occupied by cationsother than H+.”

In acid soils, H+ replaces the cations; but in basic soils, H+ replace by cations.

Page 18: Chemical Weathering. I. Introduction Chemical Weathering I. Introduction II. Process of Decomposition A. Overview: Decomposition alters minerals into.

Chemical Weathering 

I. Introduction II. Process of Decomposition A. Overview: B. Oxidation and Reduction C. Solution D. Hydrolysis E. Ion Exchange III. Mobility A. Overview

Page 19: Chemical Weathering. I. Introduction Chemical Weathering I. Introduction II. Process of Decomposition A. Overview: Decomposition alters minerals into.

Chemical Weathering 

I. Introduction II. Process of Decomposition A. Overview: B. Oxidation and Reduction C. Solution D. Hydrolysis E. Ion Exchange III. Mobility A. Overview * Mobility of cations

(Ca+2, Mg2+, Na+) > K+ > Fe2+ > Si4+ > Ti 4+> Fe 3+> Al 3

Page 20: Chemical Weathering. I. Introduction Chemical Weathering I. Introduction II. Process of Decomposition A. Overview: Decomposition alters minerals into.

Chemical Weathering 

I. Introduction II. Process of Decomposition A. Overview: B. Oxidation and Reduction C. Solution D. Hydrolysis E. Ion Exchange III. Mobility A. Overview * Mobility of cations

(Ca+2, Mg2+, Na+) > K+ > Fe2+ > Si4+ > Ti 4+> Fe 3+> Al 3

* All related to the ionic potentialvalence (z) / ionic radius

Page 21: Chemical Weathering. I. Introduction Chemical Weathering I. Introduction II. Process of Decomposition A. Overview: Decomposition alters minerals into.
Page 22: Chemical Weathering. I. Introduction Chemical Weathering I. Introduction II. Process of Decomposition A. Overview: Decomposition alters minerals into.
Page 23: Chemical Weathering. I. Introduction Chemical Weathering I. Introduction II. Process of Decomposition A. Overview: Decomposition alters minerals into.

valence (z) / ionic radiusvery mobile = less than 3very immobile + greater than 9.5

 

Page 24: Chemical Weathering. I. Introduction Chemical Weathering I. Introduction II. Process of Decomposition A. Overview: Decomposition alters minerals into.

Chemical Weathering 

I. Introduction II. Process of Decomposition A. Overview: B. Oxidation and Reduction C. Solution D. Hydrolysis E. Ion Exchange III. Mobility A. Overview B. Leaching“The separation, selective removal, or dissolving out of soluble constituents from a rock by the natural action of percolating water”

Page 25: Chemical Weathering. I. Introduction Chemical Weathering I. Introduction II. Process of Decomposition A. Overview: Decomposition alters minerals into.

Chemical Weathering 

I. Introduction II. Process of Decomposition A. Overview: B. Oxidation and Reduction C. Solution D. Hydrolysis E. Ion Exchange III. Mobility A. Overview B. Leaching“The separation, selective removal, or dissolving out of soluble constituents from a rock by the natural action of percolating water”

The process is dependent on CLIMATE and SOIL PROPERTIES

Page 26: Chemical Weathering. I. Introduction Chemical Weathering I. Introduction II. Process of Decomposition A. Overview: Decomposition alters minerals into.

Chemical Weathering 

I. Introduction II. Process of Decomposition A. Overview: B. Oxidation and Reduction C. Solution D. Hydrolysis E. Ion Exchange III. Mobility A. Overview B. Leaching C. pH

Page 27: Chemical Weathering. I. Introduction Chemical Weathering I. Introduction II. Process of Decomposition A. Overview: Decomposition alters minerals into.

Chemical Weathering 

I. Introduction II. Process of Decomposition A. Overview: B. Oxidation and Reduction C. Solution D. Hydrolysis E. Ion Exchange III. Mobility A. Overview B. Leaching C. pH

* The mobility of ions is controlled by pH

Page 28: Chemical Weathering. I. Introduction Chemical Weathering I. Introduction II. Process of Decomposition A. Overview: Decomposition alters minerals into.

pH controls solubility….

Page 29: Chemical Weathering. I. Introduction Chemical Weathering I. Introduction II. Process of Decomposition A. Overview: Decomposition alters minerals into.
Page 30: Chemical Weathering. I. Introduction Chemical Weathering I. Introduction II. Process of Decomposition A. Overview: Decomposition alters minerals into.

Chemical Weathering III. Mobility A. Overview B. Leaching C. pH D. Fixation/Retardation

Page 31: Chemical Weathering. I. Introduction Chemical Weathering I. Introduction II. Process of Decomposition A. Overview: Decomposition alters minerals into.

Chemical Weathering 

 III. Mobility A. Overview B. Leaching C. pH D. Fixation/Retardation E. Chelation  

Page 32: Chemical Weathering. I. Introduction Chemical Weathering I. Introduction II. Process of Decomposition A. Overview: Decomposition alters minerals into.

Chemical WeatheringIV. Degree and Rate of Decomposition A. Mineral Stability

Page 33: Chemical Weathering. I. Introduction Chemical Weathering I. Introduction II. Process of Decomposition A. Overview: Decomposition alters minerals into.
Page 34: Chemical Weathering. I. Introduction Chemical Weathering I. Introduction II. Process of Decomposition A. Overview: Decomposition alters minerals into.

Chemical Weathering 

I. Introduction II. Process of Decomposition A. Overview: B. Oxidation and Reduction C. Solution D. Hydrolysis E. Ion Exchange III. Mobility A. Overview B. Leaching C. pH D. Fixation/Redardation E. Chelation IV. Degree and Rate of Decomposition A. Mineral Stability B. Secondary Minerals

Page 35: Chemical Weathering. I. Introduction Chemical Weathering I. Introduction II. Process of Decomposition A. Overview: Decomposition alters minerals into.
Page 36: Chemical Weathering. I. Introduction Chemical Weathering I. Introduction II. Process of Decomposition A. Overview: Decomposition alters minerals into.

Chemical WeatheringIV. Degree and Rate of Decomposition A. Mineral Stability B. Secondary Minerals C. Estimates based on chemical analysis 

Page 37: Chemical Weathering. I. Introduction Chemical Weathering I. Introduction II. Process of Decomposition A. Overview: Decomposition alters minerals into.

3.2 Weathering and rocks - Wikispaces · 3.2 Weathering and rocks ... Weathering is the decomposition and disintegration of rocks in situ. Decomposition refers to chemical weathering

3.2 Weathering and rocks - Wikispaces · 3.2 Weathering and rocks ... Weathering is the decomposition and disintegration of rocks in situ. Decomposition refers to chemical weathering

Ch 9. Weathering A. Mechanical Weathering B. Chemical Weathering C. Soil.

Ch 9. Weathering A. Mechanical Weathering B. Chemical Weathering C. Soil.

Lesson 1 Reading Guide - Vocab weathering mechanical weathering chemical weathering oxidation Weathering.

Lesson 1 Reading Guide - Vocab weathering mechanical weathering chemical weathering oxidation Weathering.

Encyclopedia of Geography Rock Weathering - montclair.edu · Page 7 of 16 Encyclopedia of Geography: Rock Weathering Chemical Weathering Chemical weathering involves the decomposition

Encyclopedia of Geography Rock Weathering - montclair.edu · Page 7 of 16 Encyclopedia of Geography: Rock Weathering Chemical Weathering Chemical weathering involves the decomposition

Weathering Charity I. Mulig. Weathering is the … physical breakdown (disintegration) and chemical alteration (decomposition) of rocks at or near the Earth’s.

Weathering Charity I. Mulig. Weathering is the … physical breakdown (disintegration) and chemical alteration (decomposition) of rocks at or near the Earth’s.

weathering mechanical weathering chemical weathering oxidation Weathering.

weathering mechanical weathering chemical weathering oxidation Weathering.

Review of Weathering & Chemical Weathering Erosion

Review of Weathering & Chemical Weathering Erosion

Phisical weathering and chemical weathering

Phisical weathering and chemical weathering

Weathering and Erosion. Mechanical Weathering Chemical Weathering.

Weathering and Erosion. Mechanical Weathering Chemical Weathering.

Chemical Weathering and Soils

Chemical Weathering and Soils

Key Terms: weathering, mechanical weathering, chemical weathering, sediment, erosion, deposition, compaction, cementation.

Key Terms: weathering, mechanical weathering, chemical weathering, sediment, erosion, deposition, compaction, cementation.

Weathering – the physical breakdown (disintegration) and chemical alteration (decomposition) of rock at or near Earth’s surface Erosion – the physical.

Weathering – the physical breakdown (disintegration) and chemical alteration (decomposition) of rock at or near Earth’s surface Erosion – the physical.

ChemicalWeathering Chemical Weathering. Chemical Weathering Chemical weathering - process by which the…

ChemicalWeathering Chemical Weathering. Chemical Weathering Chemical weathering - process by which the…

The Art of Breaking things… Weathering and Soil. Weathering ► Weathering is the physical breakdown (disintegration) and chemical alteration (decomposition)

The Art of Breaking things… Weathering and Soil. Weathering ► Weathering is the physical breakdown (disintegration) and chemical alteration (decomposition)

Chemical Weathering

Chemical Weathering

Weathering - MRS. COLE › uploads › 3 › 0 › 9 › 3 › ... · Chemical Weathering Chemical weatheringoccurs when the chemical composi-tion of rock changes. This kind of weathering

Weathering - MRS. COLE › uploads › 3 › 0 › 9 › 3 › ... · Chemical Weathering Chemical weatheringoccurs when the chemical composi-tion of rock changes. This kind of weathering

Chapter 6 Weathering and Soil. Earth’s external processes Weathering – the physical breakdown (disintegration) and chemical alteration (decomposition)

Chapter 6 Weathering and Soil. Earth’s external processes Weathering – the physical breakdown (disintegration) and chemical alteration (decomposition)

Topic Physical and Chemical Weathering. Weathering vs. Erosion Weathering--Erosion--

Topic Physical and Chemical Weathering. Weathering vs. Erosion Weathering--Erosion--

Geology 229 Engineering Geology Lecture 23 - A college of ...lanbo/G229Lect06121Weathering.pdf · Engineering Geology Lecture 23 Rock Weathering ... Chemical weathering: decomposition

Geology 229 Engineering Geology Lecture 23 - A college of ...lanbo/G229Lect06121Weathering.pdf · Engineering Geology Lecture 23 Rock Weathering ... Chemical weathering: decomposition

Weathering Physical and Chemical Weathering. “Weathering” Vocabulary chemical weathering physical weathering ice wedging abrasion oxidation carbonation.

Weathering Physical and Chemical Weathering. “Weathering” Vocabulary chemical weathering physical weathering ice wedging abrasion oxidation carbonation.