what type of enironmental change might stop the development of an organic sedimentary rock?
To determine the type of environmental change that might impede the development of an organic sedimentary rock, we first need to understand how organic sedimentary rocks are formed. Organic sedimentary rocks, such as coal or oil shale, are created from the accumulation and subsequent lithification (conversion into rock) of once-living organic materials like plants or animals.
The key factors that contribute to the formation of organic sedimentary rocks are:
1. Organic material accumulation: Being buried and preserved in an oxygen-deprived environment, such as sediments in marshes, swamps, or the ocean floor.
2. Lack of oxygen: This is important because the absence of oxygen slows down the decay and decomposition of organic matter, allowing it to be compacted and preserved.
Considering these factors, there are a few environmental changes that could potentially inhibit the development of organic sedimentary rocks:
1. Increased oxygen levels: If there is a significant rise in oxygen levels within the environment where organic material is accumulating, it can accelerate the decomposition process. Oxygen promotes the growth of aerobic microorganisms that break down organic matter, preventing its preservation and lithification.
2. Elevated temperatures: High temperatures can lead to faster decay rates, as heat accelerates the chemical reactions responsible for decomposition. If the environment experiences an increase in temperature, the organic material may degrade too quickly to become lithified.
3. Physical disturbances: Disturbances such as erosion or tectonic activity can disrupt the process of organic accumulation and compaction, preventing the formation of organic sedimentary rocks. If sediments containing organic material are eroded away or subjected to intense pressure and deformation through tectonic forces, the necessary conditions for lithification may be disrupted.
It's important to note that organic sedimentary rocks require specific environmental conditions and timescales for their formation. Any significant alteration to these conditions, such as those mentioned above, can hinder the development of such rocks.