PreLab4_Sedimentary

PreLab4_Sedimentary - Geology 2 Name_ Lab day & time_...

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Geology 2 Name_______________________________ SEDIMENTARY ROCKS, STRUCTURES AND ENVIRONMENTS PRE-LAB This prelab assignment is due at the beginning of your lab session. You will not be allowed to participate in the lab if you have not completed this prelab exercise. Read chapter 6 on sedimentary rocks in your text and the attachments to this pre-lab. Answer the following. 1. Describe and contrast mechanical weathering and chemical weathering (include information about source materials, processes, and materials produced). 2. Describe and contrast detrital and chemical sedimentation. 3. The naming of detrital sedimentary rocks is based upon their grain-size. List the following rocks in the order of descending grain size, from coarsest to the finest. Siltstone, Sandstone, Shale/mudstone, Conglomerate coarsest 1. __________________________ 2. __________________________ 3. __________________________ finest 4. __________________________ Tell a common way to decide whether a fine grained rock is a siltstone or a shale . 4. We distinguish three kinds of sandstone . Name and tell the composition and appearance of each. 1._________________ _________________________________________________ 2._________________ _________________________________________________ 3._________________ _________________________________________________
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2 Sedimentary Rocks pre-Lab 5 . What is the primary mineral (or elements) in each of the following chemical sedimentary rocks ? limestone ______________ coal ___________________ evaporite _______________ chert __________________ 6. List and/or sketch some sedimentary characteristics and structures that are commonly observed in sediments deposited in river and river flood plain environments ("fluvial" environments). Briefly tell (or sketch) why you would expect those characteristics to be formed in this environment. See your book for a diagram of river and flood plain environments.
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Sedimentary Rocks pre-Lab 3 TIPS FOR CLASSIFYING SEDIMENTARY ROCKS Begin by determining whether or not the rock has a detrital or clastic texture. If it has clastic texture (and the particles are not shell fragments) estimate the size of the particles and refer to Table 1 Part A. The distinction between clay- and silt-sized particles is that individual
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This note was uploaded on 03/21/2011 for the course GEOL 2 taught by Professor Staff during the Spring '08 term at UCSB.

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PreLab4_Sedimentary - Geology 2 Name_ Lab day & time_...

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