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Analysis of Textures in Thin Section 1. In the table below match the samples of each thin section to the textures listed. Note: there are six samples one to match each texture. Texture Description Possible Modes of Origin Thin Section Crystalline Relatively large intergrown crystals. Plutonic, Sedimentary or Phaneritic Metamorphic. Porphyritic Large crystals (phenocrysts) surrounded Always Volcanic by a fine-grained groundmass. Foliated Large crystals intergrown in planar Always Metamorphic alignment Clastic Fragmental texture composed of mineral Always Sedimentary grains and or rock fragments. Bioclastic Fragmental texture composed of fragments Always Sedimentary of shells and other organic material. Pyroclastic Fragmental texture composed of volcanic Always Volcanic ash and fragments of volcanic rock. 2. There are two additional thin sections listed as "Unknowns" these could be of any of the six textures described above. In the space below list each thin section and assign a texture to each. Thin Section Texture Unknown 1 NI
Rock Samples and Associated Textures Review the sections on texture in previous exercises, any class notes, and text references List the rocks within the set of virtual samples on your lab page online next to the appropriate textural group. An individual sample may only be placed on one line, but any textural group may have more than one sample listed. Glassy: Aphanitic: Phaneritic: Crystalline Foliated: Porphyritic: Clastic: Fragmental Bioclastic: Pyroclastic: About the Earth Discovery Project The Earth Discovery Project is a collaborative effort to integrate hands-on discovery-based learning with modem research tools in undergraduate geoscience education. The approach is to develop and disseminate a comprehensive set of leaming resources and experiences supporting systemic educational reform. The logo of the Earth Discovery Project portrays the earth as a three-dimensional puzzle. The globe used in the logo is from NASA's Blue Marble Project. The Blue Marble is a unique view of the earth, which integrates numerous data sets to construct a "true-color" three- dimensional globe. EARTH Discovery Project The Virtual Microscope for Earth Sciences is used for much of the laboratory especially the first part on Thin Section Analysis. Virtual rock samples are used from 3D collections developed using Sketchfabą. Links are to samples in various educational collections around the globe. Introductory Geology Laboratory Rock Textures de Genesis 4
Matching (activity 1) Thin Section C Thin Section A Thin Section B Thin Section D Thin Section E Thin Section F
Unknowns (activity 2) Unknown 1: Thin Section G Unknown 2: Thin Section H
VRX201 VRX11 VRX111a VRX319 VRX15 VRX203 VRX5 VRX113
VRX123 VRX307 O VRX1b VRX107 VRX142 VRX6 VRX9 (soft and gritty). VRX111b (ashy matrix)
VRX314 VRX10 VRX26 VRX127 (ashy matrix) Sample Unavailable Skip