CH 9 molasse --nonmarine sediment accumulate in foreland basin flysch --When both shale s and turbidites accumulate in foreland basins, they are collectively known as flysch. 1.What geologic features enable us to recognize ancient continental rifting? What features enable us to recognize ancient subduction zone? 缺乏地震及火山的分布,陆块上少有变形的作用发生﹙几乎可以包存古生代以来的构造﹚ molasse ; flysch ;opholite 2.What are failed rift, and how are they important to our understanding of the breakup of continents? A rift that projects inland from a continental margin but that fails to divide the continent into two seperate landmasses. 3.What is flysch and where does it form? When both shale s and turbidites accumulate in foreland basins, they are collectively known as flysch. foreland basins 4.What is molasse? Why does it normally accumulate after flysch? nonmarine sediment accumulate in foreland basin 5.Why are the Andes(安地斯山) taller than Appalachians(阿帕拉契山)? 6.Why are the Himalayan(喜马拉亚) peaks the tallest in the world today? 7.How can mountain chains form without continental collision? 隐没 8.Why do mountains have roots? isostasy 9.Are the rocks that become ophiolites within a mountain chain older or younger than molasses deposits that form along the mountain chain? younger(?) 10.Examine a world map or globe to locate mountain chains that are not discussed in this chapter. Then locate these chaines on the plate tectonic map of the world [see Figure 8-21]. See if you can figure out how the presence of each mountain system might relate to plate tectonic processes.[Some of the answers appear in the chapters that follows.] 11.Using the Visual Overview on p.232 and what you have learned in this chapter, trace the history of a continental margin that experiences the following events:[a] it originates by rifting, becomes a passive margin along which sediment accumulate, [b] stalls at a subduction zone, where subduction reverses, [c] grows a mountain chains, [d] becomes a passive marginagain when the igneous arc that formed it ceases to function, and [e] eventally loses its root through erosion and isostatic uplift. --

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