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Dating Methods in Archaeology.pptx

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Dating Methods in Archaeology.pptx

  1. 1. Dating Methods: Providing chronology to the past. IN 792 Seminar Supervisor: Prof. C N Pandey SAURABH MISHRA 21310055 ARCHAEOLOGICAL SCIENCES CENTER
  2. 2. Absolute Dating Methods Carbon-14 Dating K-Ar Dating Uranium Dating TL and OSL Dating Fission Track Dating Electron spin resonance Dating Rehydroxylation [RHX] dating Cementochronology
  3. 3. Carbon-14 Dating Developed by Willard Libby in 1940s Also known as Radiocarbon dating (use properties of radioactive isotope of carbon). Used to date organic substances- bone, cloth, wood, plant fibres. Can only date specimens up to about 60,000 years old 14 C half life= 5730 years Calibration for older dates= conversion to calendar years because atmospheric 14C/12C ratio is not constant measurement- beta counting replaced by Accelerator Mass spectrometer https://sharedveracity.net/2019/02/09/does-carbon-14-radiometric-dating-undermine-the-bible- or-confirm-it/
  4. 4. K-Ar Dating Timeline- 4 billion years Dates rock 60,000 years old and older Half life of radioactive potassium (40K= 1330 million years). 40 K decays to 40 Ar at known rate. Scientists determine the age of the rock (rich in potassium) surrounding the fossil to determine the fossil’s age. Used only for inorganic substances (igneous rocks ) Scientists measure the amount of argon in the rock to determine its age https://thenoblegasbag.wordpress.com/2014/08/07/how-old-is-that-rock-part-2-k-ar-dating/ https://www.creationliberty.com/articles/kardating.php
  5. 5. U- Dating Uranium series dating is a radiometric dating technique commonly used to determine the age of calcium carbonate materials such as speleothem or coral. These methods are based on the radioactive decay of isotopes of uranium. The process where by a radioactive isotope of uranium 238 U+ decays into 235 U+ is calculated. The date is determined based on the amount of 235 U+ that had accumulated through radioactive decay. https://isobarscience.com/u-th/application/
  6. 6. TL- OSL Dating It measures the amount of light emitted from energy stored in certain rock types and derived soils to obtain an absolute date for a specific event that occurred in the past- burnt flint and ceramics Thermoluminescence –the object has been exposed to temperatures between 400 and 500C; and optically stimulated luminescence (OSL), which measures energy emitted after an object has been exposed to daylight Emit stored energy while heating/exposed to light
  7. 7. Fission track Method many minerals and natural glasses contain minimal quantities of uranium Detectable damaged tracks https://www2.le.ac.uk/institution/fpgr/archive-of-past- festivals/2015/meet/2013/geosciences/szameitat/thermochronology
  8. 8. ESR Dating The age of substance can be determined by measuring the dosage of radiation since the time of its formation. broad range of materials, such as quartz, mollusc shells, corals, speleothems and fossil tooth enamel. • Range 2.6mya
  9. 9. Observations https://humanorigins.si.edu/evidence/dating
  10. 10. Cntd.. Multi Proxy Analysis Lack of material (only certain material can be dated) Contamination
  11. 11. Conclusions Understanding theoretical concepts of Dating methods • Limitations • Advantages • Applications Relative dating method • Comparative Age • Low precision • Qualitiative measurement • Works better for sedimentary rocks having layered arrangement of sediments • Less-expensive and efficient Absolute dating method • Numerical Age • High Precision • Works better for igneous and metamorphic rocks • Expensive and takes time
  12. 12. Future Plans Taking IN project on OSL Dating next semester Lab training at NFSU Gandhinagar
  13. 13. References “Archaeological Dating – Crow Canyon Archaeological Center.” Accessed September 21, 2022. https://www.crowcanyon.org/education/learn-about-archaeology/archaeological-dating/. Bradley, Raymond S. “Dating Methods I.” In Paleoclimatology, 55–101. Elsevier, 2015. https://doi.org/10.1016/B978-0-12-386913-5.00003-X. HARDING, J. R. “DATING: A Summary of Methods and Some Recent Developments.” The Journal of the Polynesian Society 64, no. 1 (1955): 102–12. Jungner, Hogne. “DATING IN ARCHAEOLOGY.” Fennoscandia Archaeologica XII (January 1, 1995): 37–38. Killick, David, and Suzanne Young. “Archaeology and Archaeometry: From Casual Dating to a Meaningful Relationship?” Antiquity 71 (September 1, 1997): 518–24. https://doi.org/10.1017/S0003598X0008529X. McBeth, Joyce, Karla Panchuk, Tim Prokopiuk, Lyndsay Hauber, and Sean Lacey. “Overview of Relative and Absolute Dating,” January 8, 2020. https://openpress.usask.ca/geolmanual/chapter/overview-of-relative-and-absolute-dating/. Michels, Joseph W. “Dating Methods.” Annual Review of Anthropology 1 (1972): 113–26. Tarbuck, Edward J., Frederick K. Lutgens, and Dennis G. Tasa. Earth Science, Global Edition. Pearson Education, 2015. vdocument.in. “Tarbuck, E.J., Lutgens, F.K. 2005. Earth: An Introduction ... Article- Chapter 10... · PDF FileTarbuck, E.J., Lutgens, F.K. 2005. Earth: An Introduction to Physical Geology. Pearson - [PDF Document].” Accessed September 21, 2022. https://vdocument.in/tarbuck-ej-lutgens-fk-2005-earth-an-introduction-article-chapter-10.html. Watchman, A. L, and C. R Twidale. “Relative and ‘Absolute’ Dating of Land Surfaces.” Earth-Science Reviews 58, no. 1 (July 1, 2002): 1–49. https://doi.org/10.1016/S0012-8252(01)00080- 0. Watchman, A.L., and C. Twidale. “Relative and ‘absolute’ Dating of Land Surfaces.” Earth-Science Reviews 58 (July 1, 2002). https://doi.org/10.1016/S0012-8252(01)00080-0. Zarean, Kimia. “Archaeological Dating.” December 1, 2019. Accessed September 21, 2022. https://www.bing.com/search?q=Tarbuck+and+Lutgens+text%2C+pages+262+- +264&cvid=e22cecf5046442b288a3c0f5d4eceeb2&aqs=edge..69i57.1145j0j1&pglt=43&FORM=ANNTA1&PC=EDGEDSE.

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