compound cross bedding

简明释义

复合交错层理;

英英释义

例句

1.Geologists often study compound cross bedding 复合交错层理 to understand ancient river systems and their dynamics.

地质学家常常研究复合交错层理 复合交错层理以了解古代河流系统及其动态。

2.Students learned how to identify compound cross bedding 复合交错层理 during their field trip to the sandstone outcrops.

学生们在前往砂岩露头的实地考察中学习如何识别复合交错层理 复合交错层理。

3.In this region, the presence of compound cross bedding 复合交错层理 suggests that the area was once a delta.

在这个地区，复合交错层理 复合交错层理的存在表明该地区曾经是一个三角洲。

4.The sedimentary rock formation exhibits clear signs of compound cross bedding 复合交错层理, indicating a complex depositional environment.

这层沉积岩形成清晰的复合交错层理 复合交错层理特征，表明了复杂的沉积环境。

5.The compound cross bedding 复合交错层理 seen in the cliffs provides insight into the historical wind patterns.

悬崖中看到的复合交错层理 复合交错层理为历史风向提供了见解。

作文

The study of sedimentary structures is crucial for understanding the geological history of an area. One fascinating feature that geologists often encounter is compound cross bedding. This term refers to a specific type of sedimentary structure that results from the deposition of sediments in a non-unidirectional flow environment, typically associated with rivers, deltas, or coastal settings. Understanding compound cross bedding can provide valuable insights into past environments and the dynamics of sediment transport.To grasp the concept of compound cross bedding, it is essential to first understand what cross bedding is. Cross bedding occurs when layers of sediment are deposited at an angle to the main bedding plane, creating a series of inclined layers. This process is often influenced by factors such as wind or water currents. In contrast, compound cross bedding consists of multiple sets of cross beds stacked on top of one another, indicating changes in the flow direction or energy of the depositional environment over time.One of the key characteristics of compound cross bedding is its ability to record complex sedimentary processes. For example, in a river setting, variations in water velocity can lead to shifts in sediment deposition. When the flow is strong, larger grains may be transported and deposited at steeper angles. Conversely, during periods of lower energy, finer materials may settle, creating a different set of cross beds. This interplay between high and low-energy conditions produces the intricate patterns seen in compound cross bedding.Geologists often analyze compound cross bedding to interpret past environmental conditions. By examining the orientation and thickness of the cross beds, scientists can infer the direction of ancient currents and the relative energy of the depositional environment. For instance, a predominance of steeply dipping cross beds might suggest a high-energy environment, such as a river channel, while more gently sloping beds could indicate a calmer setting, like a delta or floodplain.In addition to providing insights into sediment transport and depositional processes, compound cross bedding can also serve as a useful tool for stratigraphic correlation. By identifying distinct patterns of cross bedding in different rock layers, geologists can correlate these layers across vast distances, aiding in the reconstruction of regional geological histories.Moreover, compound cross bedding has practical implications beyond academic research. For instance, in the field of petroleum geology, understanding sedimentary structures can help identify potential reservoirs. The porosity and permeability of sedimentary rocks are often influenced by their depositional features, including compound cross bedding. Therefore, recognizing these structures can guide exploration efforts in finding oil and gas deposits.In conclusion, compound cross bedding is a significant sedimentary structure that provides valuable information about past environments and sedimentary processes. Its complex patterns reflect changes in flow dynamics and energy conditions, making it an essential focus for geologists studying sedimentary rocks. By analyzing compound cross bedding, scientists can enhance their understanding of earth's geological history and improve resource exploration strategies.

沉积结构的研究对于理解一个地区的地质历史至关重要。地质学家经常遇到的一个迷人特征是复合交错层理。这个术语指的是一种特定类型的沉积结构，它是由于沉积物在非单向流动环境中沉积而形成的，通常与河流、三角洲或海岸环境相关。理解复合交错层理可以为过去环境和沉积物运输的动态提供有价值的见解。要掌握复合交错层理的概念，首先需要了解什么是交错层理。交错层理发生在沉积层以角度沉积于主要层面时，形成一系列倾斜层。这一过程通常受到风或水流等因素的影响。相比之下，复合交错层理由多个交错层叠加在一起组成，表明沉积环境的流动方向或能量随时间的变化。复合交错层理的一个关键特征是它能够记录复杂的沉积过程。例如，在河流环境中，水速的变化可能导致沉积物沉积的变化。当流速较强时，较大的颗粒可能被运输并以更陡的角度沉积。相反，在低能量时期，较细的材料可能会沉积，从而形成一组不同的交错层。这种高能和低能条件之间的相互作用产生了复合交错层理中所见的复杂图案。地质学家通常分析复合交错层理以推断过去的环境条件。通过检查交错层的方向和厚度，科学家可以推测古代水流的方向和沉积环境的相对能量。例如，陡峭的交错层可能表明高能环境，如河道，而较缓的层则可能表明较平静的环境，如三角洲或泛滥平原。除了提供关于沉积物运输和沉积过程的见解外，复合交错层理还可以作为地层对比的有用工具。通过识别不同岩层中独特的交错层理模式，地质学家可以在广阔的距离上对这些层进行对比，有助于重建区域地质历史。此外，复合交错层理在学术研究之外也具有实际意义。例如，在石油地质学领域，理解沉积结构可以帮助识别潜在的储层。沉积岩的孔隙度和渗透率通常受到其沉积特征的影响，包括复合交错层理。因此，识别这些结构可以指导石油和天然气的勘探工作。总之，复合交错层理是一种重要的沉积结构，提供了关于过去环境和沉积过程的宝贵信息。其复杂的图案反映了流动动态和能量条件的变化，使其成为地质学家研究沉积岩的重要焦点。通过分析复合交错层理，科学家可以增强对地球地质历史的理解，并改善资源勘探策略。