EAPS 100 Homework 2.pdf - Homework 2 EAPS 10000 Y01 Planet...

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Homework 2EAPS 10000 Y01Planet Earthonline course (Prof. L. Braile)Homework Assignment #2 (June, 2018)30 points6/18Plate Motions from Hotspot Tracks (The Hawaiian IslandEmperorSeamount Chain) and Ocean Crust AgesName:___________If writing by hand, be sure to print legibly.Part 1.Hawaiian Hotspot Track(See submission information on Page 7)Objective:Observation of the age of volcanic rocks in the Hawaiian Island-Emperor Seamount Chainprovides data to estimate the direction and velocity of plate motion of the Pacific plate over a fixed mantlehotspot.This assignment produces an actual (and reasonably accurate) measurement of plate motion andprovides experience with map and graph analysis.1.Background:Reading in Text (Lutgens and Tarbuck, 2017[L&T, 8thed., 2017]):Evidence: Hot Spots,pages163-164(172-173 in L&T, 2014 [L&T, 7thed.]), Figure5.26(Figure 5.26 in L&T, 2014).Hawaiianvolcanism and the volcanic structure of the islands are illustrated in Figures7.4, 7.6, 7.12, 7.13, 7.14, 7.36C,and 7.38(Figures 7.3, 7.5, 7.10, 7.11, 7.12, 7.34C, and 7.36 in L&T, 2014).Figure 1.The Hawaiian-Emperor Chain of Volcanic Islands and Seamounts.Ages of islands and seamountsare in millions of years (m.y.).Meiji Seamount (upper left) is about 2000 meters below sea level due tocooling and contraction of the lithosphere as the seamount and oceanic lithosphere moved away from theHawaiian hotspot, and is about 90 million years old (modified, in white, from This Dynamic Planet map).________________________________© Copyright, L. Braile, Purdue University, 2018
2Figure 2.Southeastern volcanic islands and seamounts of the Hawaiian-Emperor Chain of Volcanic Islandsand Seamounts.Numbers in parentheses are approximate ages in millions of years (m.y.) of the islands andseamounts from radiometric dating of lava flows.Small dot on each island or seamount is the approximatecenter of the island or seamount for measuring distances from Loihi.(Modified from Blay and Siemers, 2013.)2.Introduction and Instructions:ExamineFigure 2which is similar to the map shown in Figure5.26L&T, 2017, (Figure 5.26 in L&T, 2014).TheLoihi volcano(seamount) is actively growing by underseavolcanic eruptions just to the southeast of the island ofHawaii.It will become, in several tens of thousands tohundreds of thousands of years, the next Hawaiian island.Measure the distancesof each of theselectedislands(listed inTable 1) fromLoihi.Use the approximate center of each island (small dot) as a location tomeasure the distances fromLoihi.There is a larger version ofFigure 2on the last page (page 8) of thisdocument.The distance scale on that Figure should print out so that each 100 km on the scale is equal to 1 cmon the scale diagram.If that is the case on your copy (check that the distance from 0 km to 2200 km on thescale is 22 cm on the page), you can use acm scalerulerto easily make the measurements.If the scale onthe last page does not measure 22 cm (full length), you can either print out that page with appropriate scalingso that it is 22 cm, or just copy the scale as shown, fold the paper so that the scale is on the edge, and measure

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Oceanography, Radioactive Dating, Minerals, Plate Tectonics, Volcanoes, Hawaiian Islands, ocean crust ages, Nihoa Island, EAPS 100

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