Awkward
发表于 2025-3-21 17:57:10
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洁净
发表于 2025-3-21 23:20:37
The Appalachians and Interior Lowlands of the North American Craton,ts apex near the Mexican border. The . in the northern part of this block remained, for the most part, a positive region receiving little or no sediment. The southern part, now forming the ., was repeatedly inundated and received a cover of platform sediments.
相信
发表于 2025-3-22 00:52:16
Gondwanaland in Late Palaeozoic Times,y separated cratons were welded together to produce a single, very much larger, stable unit. Orogenic activity continued in peripheral mobile zones which formed a nearly continuous girdle enveloping the newly consolidated craton (Fig. 6.1).
思考才皱眉
发表于 2025-3-22 07:01:31
The Alpine-Himalayan Belt and the Eurasian Craton,stem encircling the supercontinents. It was transformed to a largely intra-continental structure by the collision of northward-moving fragments of Gondwanaland — Africa, Arabia and Peninsular India — with the Eurasian continental mass.
rods366
发表于 2025-3-22 08:45:52
The Caledonides and their Forelands,sed a rather larger number of smallish cratons; much of this southern network was effectively stabilised well before the end of the Lower Palaeozoic and only a few branches remained active in later Phanerozoic times.
狂热语言
发表于 2025-3-22 15:20:47
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gout109
发表于 2025-3-22 19:21:47
The Cordilleran and Andean Mobile Belts and the North American Crato,ese mountain-belts mark a continental margin which has been mobile throughout the Phanerozoic eon, but a margin characterised by features which can hardly be matched in other mobile belts past or present.
激怒某人
发表于 2025-3-22 23:12:21
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主动
发表于 2025-3-23 01:55:09
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打击
发表于 2025-3-23 08:31:28
The Caledonides and their Forelands,until well into the Phanerozoic eon. In Laurasia (Fig. 2.1) this system was built around a fairly small number of cratons; most parts of the system remained mobile at least until the end of Lower Palaeozoic times and some are still in being at the present day. In Gondwanaland, the mobile belts enclo