Core 1263C/D begins accumulating calcium carbonate before the other cores collected during Leg 208. Why does core 1263C/D recover faster from the acidification event than the other cores collected along the Walvis Ridge?a.Core 1263C/D moved by plate tectonics to a location under more highly productive water.b.Core 1263C/D is shallower. As the ocean recovered, the CCD deepened.c.Core 1263C/D received sediment influx from land.d.Both A and B are correct. Figure 12B-4 provides pictures of five of the cores collected during the cruise. Each core was taken from a progressively deeper site. The shallowest core was recoveredfrom 2717 m water depth and the deepest core from 4755 m. The core information does not show the entire sediment record for each core, rather it notes specific sectionsrelevant for the examination of the PETM. The depth within the core is notated as meters composite depth (mcd). For example, the top of core 1263C/D is 334 mcd. Thissection of the core was collected 334 meters below the sediment water interface. Conversely, the top of core 1262A is 138.4 mcd. It was collected 138.4 meters below thesediment water interface.1263C/D2717 m water depth3341265A3060 m water depth1266C3798 m water depth1267B4355 m water depth3051262A4755 m water depth230-335315-306139231-336-316-140-O 50 100CaCO, (wt%)30750 100CaCO, (wt%)232-50 100CaCO, (wt%)50 100CaCO, (wt%)50 100CaCO, (wr%)Figure 12B-4. Photographs of five sediment cores collected during Leg 208. Depth is measured in meters composite depth (mcd). [Courtesy: Zachos et al., 2004]Depth (medi To explore the effect of the PETM on the planet, scientists set out on Leg 208 to collect six cores along the flank of the Walvis ridge, off the southwest coast of Africa.For more on LEG 208 visit Link 12B-2.The Walvis Ridge is a northeast-southwest trending aseismic ridge. It divides the eastern South Atlantic Ocean into two basins: the Angola Basin to the north and theCape Basin to the south. Figure 12B-3 provides a map of the location where the cores were collected between water depths of 2500 to 4770 m. Today, the depth of thecalcite compensation depth (CCD), the depth below which all calcium carbonate dissolves, is around 3700 m. Two of the six cores collected during the cruise fall near orbelow the modern CCD.- 5001500250035004500North12641263550012651266650012671262(u) Kaoligeg

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Applications and Investigations in Earth Science (9th Edition)

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ISBN:9780134746241

Author:Edward J. Tarbuck, Frederick K. Lutgens, Dennis G. Tasa

Publisher:Edward J. Tarbuck, Frederick K. Lutgens, Dennis G. Tasa

Chapter1: The Study Of Minerals

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Core 1263C/D begins accumulating calcium carbonate before the other cores collected during Leg 208. Why does core 1263C/D recover faster from the acidification event than the other cores collected along the Walvis Ridge?

a.Core 1263C/D moved by plate tectonics to a location under more highly productive water.
b.Core 1263C/D is shallower. As the ocean recovered, the CCD deepened.
c.Core 1263C/D received sediment influx from land.
d.Both A and B are correct.