|
干涉波在现在的自然水体环境中极其常见，但其遗迹则非常稀少。许多从事地质工作多年的人不认识也就不足怪。俗话讲，物以稀为贵，特别是多种沉积现象集中出现在很小的地区内，更是弥足珍贵。 以下为从网上搜到的干涉波痕实例，不加翻译，原文照登。每个实例的来源均明确标出。同时希望博友们能够提供更多的实例。 INTERFERENCE RIPPLES （定义） Interference ripples (a.k.a.“ladderback ripples”) are uncommon sedimentary structures. They consist of sediment surfaces showing two sets of ripple crests intersecting at high angles. They form as ripples get developed on an already-rippled sediment surface. They indicate the existence of two successive current directions.
Interference ripples on modern shallow-Water seafloor (western French Bay, southwesternSan Salvador Island, eastern Bahamas) . The sea-floor sediments are composed of biogenic aragonite (CaCO3). The prominent ridges are symmetrical ripple marks, formed by a dominant, shallow-water, two-directional current. The smaller, ladder-like ridges are symmetrical ripple marks formed by a subordinant, shallow-water, two-directional current. The two sets of ripple marks form an interesting network of sea floor ridges - interference ripples. ==================================================================
Interference ripples in quartzose sandstone (Berea Sandstone, lower Kinderhookian Stage,lowermost Mississippian). The two successive current directions indicated bythe symmetrical ripples on this slab are left-to-right and up-and-down. The ripple set with ridges oriented up & down formed by a dominant shallow-water, two-directional current moving perpendicular to the ridge crests(= left-and-right direction, when looking at this upright slab). OSU public display (Orton GeologyMuseum, Ohio State University, Columbus, Ohio, USA). ============================================================
上面照片来源：http://digital.lib./cdm/singleitem/collection/geoscience/id/2793 ============================================================
These strange ripples in the Shepard formation are called interference ripple marks. They form when two currents go against each other at ~90°. Fieldnotebook for scale. 上面照片来自：http://blogs./mountainbeltway/2010/08/23/rocks-of-glacier-national-park/ ==========================================================
照片来自： =================================================================
在百度文库中，找到一个中国人编写的有关干涉波痕的文件。 干涉波痕：在浅水地区，水流和波浪同时存在，在它们的联合作用下，可形成干涉波痕。左侧的为格子状干涉波痕，右侧为梯子状干涉波痕。
|
|
|
