lecture05 - History of Earth and Life Lecture 5 1...

Info iconThis preview shows pages 1–2. Sign up to view the full content.

View Full Document Right Arrow Icon
History of Earth and Life Lecture 5 1 Geological Record: Rocks, Rock Cycles, and Their Interpretation Types of data used in Historical Geology Types of rocks Rock Cycles Facies, and Ancient Environments Scientific Principles of Historical Geology Summary Major types of data from rocks used in Historical Geology Geological characteristics of rock bodies observed in the field: spatial arrangement of rock bodies, internal structure of rock sequences, contacts Characteristics of rocks (mineral composition, geochemical signature, texture, etc.) Fossils extracted from rocks Mineral grains extracted from rocks Geochemical properties of rocks and fossils Stable isotopes estimated from rocks/fossils Types of Rocks Igneous rocks Form by cooling of molten material (magma) Extrusive rocks form from molten material (lava) that reached the Earth's surface Intrusive rocks form within Earth Important in Historical Geology: Source of sediment for sedimentary rocks Absolute dating Their characteristics provide insights into ancient history of tectonic plates Metamorphic Rocks Form by alteration of existing rocks that are heated and/or under increased pressure Their type depends on both the composition of the original rock and the temperature and
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Image of page 2
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 03/24/2008 for the course GEOS 1014 taught by Professor Sxiao during the Spring '08 term at Virginia Tech.

Page1 / 3

lecture05 - History of Earth and Life Lecture 5 1...

This preview shows document pages 1 - 2. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online