autochthonous sedimentation

简明释义

1. 原地沉积; 2. 自生沉积; 3. 原地沉积作用; 4. 自生沉积作用;

英英释义

例句

1.The core samples indicated layers of autochthonous sedimentation, suggesting a stable environment over millennia.

岩心样本显示出自生沉积的层次，暗示着数千年来环境的稳定。

2.The study of autochthonous sedimentation in this region reveals how local geological processes shape the landscape.

对该地区的自生沉积研究揭示了局部地质过程如何塑造地貌。

3.Understanding autochthonous sedimentation is crucial for predicting future geological changes.

理解自生沉积对于预测未来的地质变化至关重要。

4.In this coastal area, autochthonous sedimentation plays a key role in the ecosystem's health.

在这个沿海地区，自生沉积在生态系统健康中发挥着关键作用。

5.Researchers found that autochthonous sedimentation significantly contributed to the formation of the delta.

研究人员发现，自生沉积对三角洲的形成有重要贡献。

作文

In the study of geology and sedimentology, understanding the processes that contribute to the formation of sedimentary rocks is crucial. One important concept in this field is autochthonous sedimentation, which refers to the process by which sediments are deposited in the same location where they were originally formed. This contrasts with allochthonous sedimentation, where sediments are transported from one location to another before being deposited. The significance of autochthonous sedimentation lies in its implications for interpreting geological history and the environmental conditions present at the time of sediment deposition.When sediments are classified as autochthonous, it indicates that they have undergone minimal transportation or alteration from their source. For instance, organic materials such as plant debris and shells can accumulate in situ, forming layers that provide valuable insights into past ecosystems. These sediments often preserve a record of the local environment, making them essential for paleontologists and geologists alike.The study of autochthonous sedimentation can reveal much about ancient climates and ecological conditions. For example, if a layer of sediment consists predominantly of freshwater mollusk shells, it suggests that the area was once a freshwater environment. Similarly, coal deposits, which are formed from the accumulation of plant material in swampy areas, exemplify autochthonous sedimentation as they indicate specific conditions that prevailed during the time of their formation.Moreover, recognizing autochthonous sedimentation helps geologists in reconstructing the depositional environments of sedimentary rocks. By studying the characteristics of these sediments, such as grain size, composition, and fossil content, scientists can infer the energy conditions and biological activity of the past. For instance, fine-grained mudstones typically indicate low-energy environments, while coarse sandstones suggest higher energy conditions, such as those found in river channels or beaches.In contrast, understanding the processes leading to allochthonous sedimentation is equally important. Allochthonous sediments are often transported by water, wind, or ice from their original location. This transportation can lead to the mixing of different sediment types and can obscure the original depositional environment. Hence, distinguishing between autochthonous and allochthonous deposits is critical for accurate geological interpretations.In conclusion, autochthonous sedimentation plays a vital role in the field of sedimentology. It provides essential information about the conditions under which sediments were formed and deposited. By studying these processes, geologists can better understand the Earth's history, including past climates and ecosystems. As researchers continue to explore sedimentary records, the importance of recognizing and analyzing autochthonous sedimentation will remain a key aspect of geological studies, contributing to our overall knowledge of the planet's dynamic systems.

自生沉积是地质学和沉积学研究中的一个重要概念，指的是沉积物在其原始形成地点沉积的过程。这与异生沉积相对，后者指的是沉积物在被沉积之前从一个地方运输到另一个地方。自生沉积的重要性在于它对解释地质历史和沉积时环境条件的影响。当沉积物被分类为自生时，表示它们在来源地经历了最小的运输或改变。例如，有机材料如植物残骸和贝壳可以原位积累，形成层，这些层提供了对过去生态系统的宝贵见解。这些沉积物通常保留了当地环境的记录，使它们对古生物学家和地质学家都至关重要。对自生沉积的研究可以揭示古代气候和生态条件。例如，如果一层沉积物主要由淡水软体动物的贝壳组成，这表明该地区曾经是一个淡水环境。同样，煤层是由植物材料在沼泽地区积累而成的，作为自生沉积的例子，它们指示了形成时特定的条件。此外，认识到自生沉积帮助地质学家重建沉积岩的沉积环境。通过研究这些沉积物的特征，如颗粒大小、成分和化石含量，科学家可以推断出过去的能量条件和生物活动。例如，细粒泥岩通常指示低能环境，而粗砂岩则表明较高的能量条件，如河道或海滩。相比之下，理解导致异生沉积的过程同样重要。异生沉积物通常通过水、风或冰从其原始位置运输。这种运输可能会导致不同沉积类型的混合，并可能掩盖原始沉积环境。因此，区分自生和异生沉积物对于准确的地质解释至关重要。总之，自生沉积在沉积学领域中发挥着至关重要的作用。它提供了关于沉积物形成和沉积条件的重要信息。通过研究这些过程，地质学家可以更好地理解地球的历史，包括过去的气候和生态系统。随着研究人员继续探索沉积记录，识别和分析自生沉积的重要性将仍然是地质研究的关键方面，为我们对地球动态系统的整体知识做出贡献。