Which of the following is not an intrusive igneous body? This question delves into the fascinating world of igneous rocks, unveiling their origins, characteristics, and the intriguing differences between intrusive and non-intrusive varieties.
Igneous rocks, formed from the cooling and solidification of molten magma or lava, exhibit a captivating array of textures and compositions. Intrusive igneous bodies, as their name suggests, form when magma solidifies within the Earth’s crust, whereas non-intrusive igneous bodies result from the cooling of lava on the Earth’s surface.
Intrusive Igneous Bodies: Which Of The Following Is Not An Intrusive Igneous Body
Intrusive igneous bodies are formed when magma cools and solidifies beneath the Earth’s surface. They are typically larger and have a coarser texture than extrusive igneous bodies. Common types of intrusive igneous bodies include batholiths, stocks, dikes, and sills.
Types of Intrusive Igneous Bodies, Which of the following is not an intrusive igneous body
- Batholithsare the largest type of intrusive igneous body, with a surface area of at least 100 square kilometers and a depth of several kilometers.
- Stocksare smaller than batholiths, with a surface area of less than 100 square kilometers.
- Dikesare tabular-shaped intrusive bodies that cut across the surrounding rocks.
- Sillsare tabular-shaped intrusive bodies that parallel the surrounding rocks.
Characteristics of Intrusive Igneous Bodies
Intrusive igneous bodies are typically formed when magma rises through the Earth’s crust and cools slowly beneath the surface. The slow cooling allows the minerals in the magma to grow larger and more interlocking, resulting in a coarse texture. Intrusive igneous bodies are also typically composed of felsic minerals, such as quartz, feldspar, and mica.
Non-Intrusive Igneous Bodies
Non-intrusive igneous bodies are formed when magma erupts onto the Earth’s surface. They are typically smaller and have a finer texture than intrusive igneous bodies. Common types of non-intrusive igneous bodies include lava flows, pyroclastic rocks, and volcanic domes.
Differences between Intrusive and Non-Intrusive Igneous Bodies
The following table compares the key characteristics of intrusive and non-intrusive igneous bodies:
| Characteristic | Intrusive Igneous Bodies | Non-Intrusive Igneous Bodies |
|---|---|---|
| Formation | Formed when magma cools and solidifies beneath the Earth’s surface | Formed when magma erupts onto the Earth’s surface |
| Size | Typically larger | Typically smaller |
| Texture | Coarse | Fine |
| Composition | Typically composed of felsic minerals | Can be composed of a variety of minerals |
The differences between intrusive and non-intrusive igneous bodies have important implications for understanding igneous processes. Intrusive igneous bodies can provide information about the composition and temperature of the magma that formed them, as well as the conditions under which they cooled.
Non-intrusive igneous bodies can provide information about the eruptive history of a volcano and the nature of the magma that was erupted.
Query Resolution
What is the difference between intrusive and non-intrusive igneous bodies?
Intrusive igneous bodies form when magma solidifies within the Earth’s crust, while non-intrusive igneous bodies form when lava cools on the Earth’s surface.
What are some examples of intrusive igneous bodies?
Batholiths, stocks, dikes, and sills are all examples of intrusive igneous bodies.
What are some examples of non-intrusive igneous bodies?
Lava flows and pyroclastic rocks are examples of non-intrusive igneous bodies.
