authigenic overgrowth

简明释义

自生增长;

英英释义

例句

1.In marine environments, authigenic overgrowth 自生过生长 can influence the diagenetic processes of sediments.

在海洋环境中，authigenic overgrowth 自生过生长 可以影响沉积物的成岩过程。

2.The presence of authigenic overgrowth 自生过生长 can complicate the interpretation of geological history.

存在authigenic overgrowth 自生过生长 可能会使地质历史的解释变得复杂。

3.Geologists often analyze authigenic overgrowth 自生过生长 to understand past environmental conditions.

地质学家通常分析authigenic overgrowth 自生过生长 以了解过去的环境条件。

4.The study of sedimentary rocks revealed significant authigenic overgrowth 自生过生长 on the mineral grains.

对沉积岩的研究揭示了矿物颗粒上显著的authigenic overgrowth 自生过生长。

5.Researchers observed that authigenic overgrowth 自生过生长 was prevalent in areas with high organic matter concentration.

研究人员观察到，在有机物浓度高的区域，authigenic overgrowth 自生过生长 非常普遍。

作文

In the study of sedimentology, the term authigenic overgrowth refers to the process where minerals precipitate and grow on existing grains in sedimentary rocks. This phenomenon is crucial for understanding the diagenetic processes that alter sediments after their deposition. When sediments are buried, they undergo various changes due to pressure, temperature, and chemical reactions with fluids. One significant aspect of these changes is the formation of authigenic overgrowth.

To illustrate the importance of authigenic overgrowth, consider a scenario where quartz grains are deposited in a marine environment. Over time, as these grains become buried under additional layers of sediment, they may be subjected to silica-rich pore waters. The dissolved silica can precipitate on the surface of the quartz grains, leading to the formation of a thin layer of new quartz crystals. This process not only enhances the grain size but also affects the physical properties of the rock, such as porosity and permeability.

Additionally, authigenic overgrowth can influence the reservoir quality of sedimentary rocks, which is particularly important in the context of petroleum geology. The presence of authigenic minerals can either enhance or diminish the ability of the rock to store and transmit fluids. For instance, if calcite precipitates as an authigenic overgrowth on the pore spaces of a sandstone, it may reduce porosity and permeability, thus impacting hydrocarbon production.

Furthermore, the study of authigenic overgrowth provides insights into the paleoenvironmental conditions at the time of sediment deposition. The types of minerals that form as overgrowths can indicate the chemical composition of the water and the biological activity present in the environment. For example, the presence of glauconite as an authigenic overgrowth might suggest a low-energy marine setting, while the occurrence of pyrite could indicate reducing conditions typical of anoxic environments.

In conclusion, understanding authigenic overgrowth is vital for geologists and sedimentologists as it plays a significant role in the diagenesis of sedimentary rocks. It not only modifies the physical and chemical characteristics of the sediments but also provides valuable information regarding past environmental conditions. As research continues in this field, the implications of authigenic overgrowth will undoubtedly enhance our understanding of sedimentary processes and their impact on natural resources.

在沉积学研究中，术语authigenic overgrowth指的是矿物在沉积岩中现有颗粒上沉淀和生长的过程。这一现象对于理解沉积物沉积后发生的成岩作用过程至关重要。当沉积物被埋藏时，由于压力、温度和与流体的化学反应，它们会经历各种变化。其中一个重要方面就是authigenic overgrowth的形成。

为了说明authigenic overgrowth的重要性，考虑一个场景，其中石英颗粒在海洋环境中沉积。随着时间的推移，当这些颗粒在额外的沉积层下被埋藏时，它们可能会受到富含硅的孔隙水的影响。溶解的硅可以在石英颗粒的表面上沉淀，形成一层新的薄石英晶体。这一过程不仅增强了颗粒的大小，还影响了岩石的物理特性，例如孔隙度和渗透率。

此外，authigenic overgrowth可以影响沉积岩的储层质量，这在石油地质学的背景下尤为重要。自生矿物的存在可以增强或削弱岩石储存和传输流体的能力。例如，如果方解石作为authigenic overgrowth在砂岩的孔隙空间中沉淀，它可能会降低孔隙度和渗透率，从而影响碳氢化合物的生产。

此外，authigenic overgrowth的研究提供了关于沉积物沉积时古环境条件的见解。作为自生矿物的不同类型的矿物可以指示水的化学成分和环境中的生物活动。例如，作为authigenic overgrowth出现的绿泥石可能表明一种低能量的海洋环境，而黄铁矿的出现则可能表明典型的缺氧环境中的还原条件。

总之，理解authigenic overgrowth对地质学家和沉积学家至关重要，因为它在沉积岩的成岩作用中发挥着重要作用。它不仅改变了沉积物的物理和化学特性，还提供了有关过去环境条件的宝贵信息。随着这一领域的研究不断深入，authigenic overgrowth的影响无疑将增强我们对沉积过程及其对自然资源影响的理解。