Dating Of Rocks Ppt
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Radiometric dating is a technique used to date materials such as rocks , usually based on a comparison between the observed abundance of a naturally occurring radioactive isotope and its decay products, using known decay rates . Geologists use radiometric dating to estimate how long ago rocks formed, and to infer the ages of fossils contained within those rocks . Among the best-known techniques are radiocarbon dating , potassium-argon dating and uranium-lead dating .
Example of Dating Assumptions Find a fossil with a measured ratio of 16 trillion to 1 (C12 to C14) This means 4 half-lives have expired giving a date of about 23,000 years 8 trillion to 1 : 1 half-life instead of 4 - age 5,000 What if the ratio started at: 2 trillion to 1 : 3 half-lives instead of 4 - age 17,000 28 .
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Newest Oldest Principles for Relative Dating : Law of Superposition : In any undisturbed sequence of strata, the oldest layer is at the bottom the youngest layer is at the top . Relative Dating Principles 2 . The Cross-cutting Law Any feature that cuts across a body of sediment or rock is younger than the body of sediment or rock that it cuts across .
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Dating Rock Layers How to tell how old the layers of rock are . What is Age? There are 2 kinds: Absolute Age - The number of years since the rock formed . (150 million years old, 10 thousand years old .) Relative Age - The age compared to the ages of other rocks . (older than this rock , younger than that rock .)
Absolute dating is a method of estimating the age of a rock sample in years via radiometric - Title: Fossils & The Geologic Time Scale Author: NNPS NNPS Last modified by: Jennifer McDermott Created Date: 1/29/2004 3:39:45 PM Document presentation format | PowerPoint PPT presentation | free to view . Page of .
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8-3: Radioactive Dating Summary • The Earth's rocks contain radioactive elements . • These elements decay at constant rates . • This allows us to use it like a clock and find absolute dates for rocks . • By dating moon rocks and meteors, we believe the Earth is 4 .6 billion years old .
According to the Law of Superposition, all rocks beneath an unconformity are older than the rocks above the unconformity . Crosscutting Relationships When rock layers have been disturbed by faults (a break or crack in Earth's crust) or intrusions (a mass of igneous rock that forms when magma is injected into rock and then cools and solidifies), determining relative age may be difficult .
Age Dating Rocks - Age Dating Rocks | PowerPoint PPT presentation | free to view Absolute Dating - Absolute Dating Using Radioactivity Absolute Age dating was major advance in Historical Geology More accurate reconstruction of geologic events Mostly based on . . . | PowerPoint PPT presentation | free to view
Geologic Dating and Rocks with answers .notebook 1 March 02, 2015 Feb 243:57 PM Define: Absolute dating Relative dating Uniformitarianism Principle of superposition Unconformities Fossils Radioactive Decay Halflife Feb 244:00 PM Write the question and answer on looseleaf: 1 . What is the difference between absolute dating and . . .
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Rocks . An aggregate of one or more minerals; or a body of undifferentiated mineral matter (e .g ., obsidian); or of solid organic matter (e .g ., coal) More than one crystal . Volcanic glass . Solidified organic matter . Appearance controlled by composition and size and arrangement of aggregate grains (texture)
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Dating Of Rocks Ppt
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