NASC 130 Essentials3_ch12

Marshak chapter 12 riches in rock energy mineral

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Unformatted text preview: ical coastal wetlands Tropical Sea-level rise and fall buries wetland deposits Essentials of Geology, 3rd edition, by Stephen Marshak Chapter 12: Riches in Rock: Energy & Mineral Resources Coal Formation Coal formation requires heat and pressure Coal Compaction and decay turns plant debris into peat Compaction peat Approximately 50% carbon Readily cut out of a wetland deposit Essentials of Geology, 3rd edition, by Stephen Marshak Chapter 12: Riches in Rock: Energy & Mineral Resources Coal Formation Peat is buried several km in a subsiding basin Burial compaction squeezes out water At depth, heat alters the plant material At H, N, and S are expelled as gases; C content increases H, At 70% carbon, this solid material becomes coal Essentials of Geology, 3rd edition, by Stephen Marshak Chapter 12: Riches in Rock: Energy & Mineral Resources Coal Rank Classification based on the carbon content Peat Lignite Bituminous Anthracite 50% carbon 70% carbon 85% carbon 95% carbon Anthracite forms by metamorphism in an orogenic belt Higher-rank coal yields more energy when burned Essentials of Geology, 3rd edition, by Stephen Marshak Chapter 12: Riches in Rock: Energy & Mineral Resources Coal Mining Coal is part of a specific sedimentary sequence Coal Shallow marine, coastal, fluvial, and deltaic environments Tropical to subtropical To be mined, coal must be… Within reach Thick enough (1 to 3 m) Essentials of Geology, 3rd edition, by Stephen Marshak Chapter...
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This document was uploaded on 11/25/2013.

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