1 / 13

Monday November 29, 2010

Monday November 29, 2010. (Unconformities). The Launch Pad Monday, 11/29/10. What are “inclusions”, and what do they tell us about rock layers in their area? . Inclusions are pieces of one rock unit that are contained within another.

axelle
Download Presentation

Monday November 29, 2010

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. MondayNovember 29, 2010 • (Unconformities)

  2. The Launch Pad Monday, 11/29/10 What are “inclusions”, and what do they tell us about rock layers in their area? • Inclusions are pieces of one rock unit that are contained within another. • The rock mass adjacent to the one containing the inclusion must have been there first in order to provide the rock fragments. • Therefore, the rock mass containing inclusions is the younger of the two.

  3. Announcements ??

  4. Relative Dating An unconformity represents a long period during which deposition ceased, erosion removed previously formed rocks, and then deposition resumed. In other words, it’s a break in the rock record. There are three basic types of unconformities: Angular Unconformities Disconformities Nonconformities

  5. Relative Dating Angular Unconformities An angular unconformity consists of tilted or folded sedimentary rocks that are overlain by younger, more flat lying strata. An angular unconformity indicates that during the pause in deposition, a period of deformation (folding or tilting) and erosion occurred.

  6. Relative Dating Disconformities In a disconformity, the strata on either side are essentially parallel.

  7. Relative Dating Disconformities In a disconformity, the strata on either side are essentially parallel.

  8. Relative Dating Nonconformities In a nonconformity, the break separates older metamorphic or intrusive igneous rocks from younger sedimentary strata. Here, younger strata rest upon older, metamorphic or igneous rocks.

  9. Relative Dating Nonconformities In a nonconformity, the break separates older metamorphic or intrusive igneous rocks from younger sedimentary strata. Here, younger strata rest upon older, metamorphic or igneous rocks.

  10. Relative Dating The three basic types of unconformities illustrated in the Grand Canyon.

  11. Geologic Cross - Section of a Hypothetical Region

  12. Figure 11.10 (bottom)

More Related