GY 112: Earth History
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1 UNIVERSITY OF SOUTH ALABAMA GY 112: Earth History Lecture 8a: Stable Isotope Stratigraphy Instructor: Dr. Douglas W. Haywick
2 GY 112: Lecture test preparation Thursday February 9th
3 Word List for Lecture Test 1 GY 112 "Word/Concept List" For Lecture Test One (2017) Be familiar with these +/-30 terms, people, multiple terms and/or concepts. You will see some of them in the definition and compare and contrast components of the up-coming Lecture test. They are not the only things that you are responsible for on the exam. Multiple answer, fill-in-the-blanks and essay questions will require comprehensive study of your lecture notes and web lecture notes. Use of a text book (hardcopy or electronic) during studying is not required, but may prove valuable for some students.
4 Example of a GY 112 Word List People: Smith Wegener Lyell Hutton Principles: Original Horizontality Lateral Continuity Superposition Cross-cutting Relationships Inclusions Terms: Stratigraphy Unconformity; Angular unconformity; Disconformity; Non-conformity Paleomagnetism Formation, Member, Group Eon, Era, Period (what they are and their names) Isotopes (parent, daughter) Radioactivity, radioactive decay Half life sea level, transgression, regression stratigraphy Paleoecology, Paleogeography, Paleoclimate Pelagic, Benthic taxonomy; Species, Genus, Family, Order, Phylum, kingdom biozone index fossil Nebula Protoplanet Differentiation; Cold accretion; Hot accretion Big Bang, Big Burp Fusion Supernova
5 Word List for Lecture Test 1 GY 112 "Word/Concept List" For Lecture Test One (2017) Be familiar with these 30 terms, people, multiple terms and/or concepts. You will see some of them in the definition and compare and contrast components of the up-coming Lecture test. They are not the only things that you are responsible for on the exam. Multiple answer, fill-in-the-blanks and essay questions will require comprehensive study of your lecture notes and web lecture notes. Use of a text book (hardcopy or electronic) during studying is not required, but may prove valuable for some students.
6 Word List for Lecture Test 1 GY 112 "Word/Concept List" For Lecture Test One (2017) Be familiar with these 30 terms, people, multiple terms and/or concepts. You will see some of them in the definition and compare and contrast components of the up-coming Lecture test. They are not the only things that you are responsible for on the exam. Multiple answer, fill-in-the-blanks and essay questions will require comprehensive study of your lecture notes and web lecture notes. Use of a text book (hardcopy or electronic) during studying is not required, but may prove valuable for some students.
7 Essay Question for Lecture Test 1 PART 5: Discussion Question: Answer 1 of the following questions in proper essay fashion. Do not do a point form answer! Use about a page for your answers; provide sketches where you can (worth 35 points). 1) Discuss the scientifically accepted origin of the solar system. Be sure that you address when key events took place, how scientists believe the planets grew over time, the basic composition of the planets (rocky, gaseous, ice) and their relative position in space. Illustrate your answer with one ore more sketches.
8 Last Time 1. Relative vs. Absolute Dating Techniques a) Magnetostratigraphy b) Fission Track Dating 2. Radiometric Dating 3. Mass spectrophotometers (Web Lectures 7 & 8)
9 Geological Dating Techniques Relative Techniques: Assigns an age to a rock that puts it into a narrow range (e.g., mid-devonian; Late Cretaceous, upper Pliocene). Absolute Techniques: Assigns an age to a rock that is a number (e.g., / MA; 1,453 KA +/- 67 KA).
10 Magnetostratigraphy Chron Polarity time-rock unit Period of normal or reversed polarity Normal interval Same as today Black Reversed interval Opposite to today White
11 Absolute Techniques Fission-Track Dating Measure decay of uranium 238 by counting number of tracks
12 Radiometric Dating Uranium (and others) are unstable
13 Radioactive Decay Three modes of decay 1) Alpha Decay Loss of alpha particle Convert parent into element that has nucleus containing two fewer protons 2) Beta Decay Loss of beta particle Convert parent into element whose nucleus contains one more proton by losing an electron 3) Gamma Decay Capture of beta particle Convert parent into element whose nucleus has one less proton K 40 Ar 40
14 Radioactive Decay Alpha Decay (Uranium) 238 U 206 Pb + 8α
15 Radioactive Decay Radiometric dating Radioactive isotopes decay at constant geometric rate After a certain amount of time, half of the parent present will survive and half will decay to daughter
16 Half Lives Parent Isotope Daughter Isotope Half Life (years) Datable Material(s) 14 C (Carbon-14) 14 N (Nitrogen-14) 5,730 Wood, shells and organic material 235 U (Uranium-235) 207 Pb (Lead-207) 700,000,000 Metamorphic, igneous rocks, Zircon, U-bearing minerals 40 K (Potassium-40) 40 Ar (Argon-40) 1,300,000,000 Metamorphic, igneous & sedimentary rocks; feldspar-bearing minerals 238 U (Uranium-238) 206 Pb (Lead-206) 4,500,000,000 Metamorphic, igneous rocks, Zircon, U-bearing minerals 232 Th (Thorium-232) 208 Pb (Lead-208) 14,000,000,000 Metamorphic, igneous rocks, Zircon, U-bearing minerals 87 Rb (Rubidium-87) 87 Sr (Strontium-87) 48,600,000,000 Various rocks and minerals 147 Sm (Samarium-147) 143 Nd (Neodymium-143) 106,000,000,000 Very old rocks, REE bearing minerals
17 Age Determination The all important age equation: N=N o e -λt No is the number of atoms of parent isotope remaining in a substance N is the number of atoms of daughter isotope produced through decay, λ is the decay constant (which depend on the isotope in question) t is the amount of elapsed time.
18 Age Determination A more useful equation for age determination: Rock age= 1/λ x ln[(do-d) + 1] N Do is the original amount of daughter isotope in the sample N is the amount of current parent isotope in the sample D is the amount of current daughter isotope in the sample λ is the decay constant
19 Today s Agenda A) Stable isotopes of use to geology (fractionation) B) Delta values and isotopic standards C) Delta oxygen applications (sea level change) Web notes: 8a
20 Isotopes Elements with the same number of protons, but different numbers of neutrons C 12 C 13 C 14
21 Isotopes Elements with the same number of protons, but different numbers of neutrons C 12 C 13 C 14 Stable
22 Isotopes Elements with the same number of protons, but different numbers of neutrons C 12 C 13 C 14 Stable
23 Isotopes Elements with the same number of protons, but different numbers of neutrons C 12 C 13 C 14 unstable
24 Isotopes Elements with the same number of protons, but different numbers of neutrons C 12 C 13 C C 14 C unstable Unstable (radioactive) isotopes can be used for radiometric dating
25 Isotopes Elements with the same number of protons, but different numbers of neutrons C 12 C 13 C 14 unstable Stable isotopes cannot be used for radiometic dating; however, they still have plenty of uses in geology
26 Stable Isotope Geochemistry While it is true that isotopes are subtle variations of the same elements and that they behave the same as each other as far as chemical reactions are concerned... H H 2 0 H water heavy water death water
27 Stable Isotope Geochemistry While it is true that isotopes are subtle variations of the same elements and that they behave the same as each other as far as chemical reactions are concerned... H H 2 0 H water heavy water death water No longer considered
28 Stable Isotope Geochemistry While it is true that isotopes are subtle variations of the same elements and that they behave the same as each other as far as chemical reactions are concerned... H H water heavy water...there are important (albeit subtle) differences that occur following certain physical or biological processes like: evaporation, biological respiration, biological mineralization
29 Stable Isotope Geochemistry Fractionation: The ratio of stable isotopes in a substance before and after the process. e.g., evaporation 2 H H 2 0 cloud = H H 2 0 water =
30 Stable Isotope Geochemistry Fractionation: The ratio of stable isotopes in a substance before and after the process. The amount of fractionation is expressed via the fractionation factor (α) and is a normalized ratio between the isotopes in the two products involved in the process : α (Evaporation) = H 2 /H 1 (cloud) H 2 /H 1 (water)
31 Stable Isotope Geochemistry The hydrogen isotopes are interesting, but in geology, it is the stable isotopes of carbon (C 12, C 13 ) and oxygen (O 16, O 18 ) that are the most important
32 Stable Isotope Geochemistry For example, climate change analysis
33 Stable Isotope Geochemistry There is a minor problem with this type of analysis. The abundance of 18 O to 16 O is very low, and the amount of fractionation is minute (but still measureable)... but the resulting data are really, really, really small numbers (and this is annoying!)
34 Stable Isotope Geochemistry Isotopic data are usually presented using the delta value (δ) δ 18 O = O18 /O 16 (sample) O 18 /O 16 (standard) - 1 x 1000 and are reported in parts per thousand (ppt or )
35 Stable Isotope Geochemistry Isotopic fraction of oxygen in the hydrologic cycle
36 Stable Isotope Geochemistry So what?
37 Paleoclimate Stable isotopes provide information about ice volume and paleotemperatures
38 Stable Isotope Stratigraphy Stable isotopes provide information about time
39 Eustatic Sea level Rise Stable isotopes provide information about world wide (eustatic) sea level change rise sea level fall
40 Today s Homework 1) Download and read web notes 8a 2) Review the sample lecture test & word list 1 3) Quiz Thursday (Definitions) 4) Study! Lecture test 1 Thursday Feb 9 th Next Time Lecture: Fossils 1 and 2: Dating & Paleoenvironments
41 GY 112: Earth History Lecture 8a: Stable Isotopes Instructor: Dr. Doug Haywick This is a free open access lecture, but not for commercial purposed. For personal use only.
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