Geophysics Questions: Magnetic & Gravimetric Answers

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In summary, the conversation is about a request for help with two questions: one about magnetic methods and the other about gravimetry. The first question asks for the classification of minerals based on their magnetic values and the characteristics of each group. The second question asks for the order of density of various rocks and minerals. The person requesting help is reminded of the forum rules, which require them to show effort and use the homework template before receiving help.
  • #1
nicco35
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Hello, Could you tell me help with two questions, please

The question reads as follows:

1) Magnetic methods: According magnetic values
matic susceptibility minerals can be classified into three
basic groups that have their names. Bring
designation of these groups and their most basic
characteristic. Do that holding (s) groups fall Mi-
Neral containing iron? corroborate concretely

2) Gravimetry. The density of rocks and soil depends on the density of minerals, which constitute them further
porosity, and, finally, the proportion of pores filled with air and aqueous solutions. reports fol-
ing rocks in a series from lowest to highest density:

sandstone - basalt - quartz sand - Granite - amphibolite with 30% magnetite - Clay

Thank you very much for your help..
 
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  • #2
We can't help you until you help yourself.
 
  • #3
Why are you all so cruel...
 
  • #4
We are not being cruel. Some day, you will be mining an asteroid by surgical emplacement of small nuclear charges. Your partner, my grand-child, will be assisting from her own spacesuit, just a metre away. You want to be sure that you know what you're doing, right?

When you signed up, you acknowledged that you read the forum rules and would abide by them. And so did we. We are not allowed to help unless you show an effort first.

See forum rules here:
https://www.physicsforums.com/threads/physics-forums-global-guidelines.414380/
"You MUST show that you have attempted to answer your question in order to receive help. You MUST make use of the homework template, which automatically appears when a new topic is created in the homework help forums."
 
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1) The three basic groups of minerals based on their magnetic susceptibility values are diamagnetic, paramagnetic, and ferromagnetic. Diamagnetic minerals have a negative susceptibility value, paramagnetic minerals have a positive susceptibility value, and ferromagnetic minerals have a very high positive susceptibility value. Iron-containing minerals typically fall into the ferromagnetic group, as they have a high susceptibility value due to their high iron content.

2) The series of rocks from lowest to highest density would be clay, sandstone, quartz sand, granite, basalt, and amphibolite with 30% magnetite. Clay has the lowest density due to its high porosity and low mineral density. Sandstone and quartz sand have slightly higher densities due to their compacted nature. Granite has a higher density due to its mineral composition, and basalt has an even higher density due to its high iron content. The highest density in the series is amphibolite with 30% magnetite, as the addition of magnetite increases the overall density of the rock.
 

1. What is geophysics?

Geophysics is a branch of science that combines the principles of physics, mathematics, and geology to study the Earth and its physical properties.

2. What is the difference between magnetic and gravimetric methods in geophysics?

Magnetic methods measure the Earth's magnetic field to understand the distribution of magnetic minerals in the subsurface, while gravimetric methods measure variations in the Earth's gravitational field to understand the density distribution of rocks and minerals.

3. How are magnetic and gravimetric data used in geophysics?

Magnetic and gravimetric data are used to create maps and models of the Earth's subsurface, which can help in the exploration for natural resources such as oil, gas, and minerals, as well as in understanding the structure and composition of the Earth's interior.

4. What are some practical applications of geophysics?

Geophysics has a wide range of practical applications, including earthquake and volcano monitoring, environmental studies, hazard assessments, and mineral exploration.

5. What are some tools and techniques used in magnetic and gravimetric surveys?

Some tools and techniques used in magnetic surveys include magnetometers, gradiometers, and total field magnetic measurements. In gravimetric surveys, gravimeters and gravitometers are commonly used, along with advanced data processing and modeling techniques.

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