« previous next »

Author Question: Identify the following igneous rocks based on their texture and mineral content. What will be an ... (Read 65 times)

Jipu 123

  • Hero Member
  • *****
  • Posts: 569
on: Jul 16, 2018
Identify the following igneous rocks based on their texture and mineral content.
 
  What will be an ideal response?

Question 2

What processes can form intermediate and felsic magmas from a melt that is originally mafic?
 
  What will be an ideal response?


Ptupou85

  • Sr. Member
  • ****
  • Posts: 334
Reply #1 on: Jul 16, 2018
Answer to Question 1

a. Fine-grained rock with 0 quartz, 0 potassium feldspar, 61 plagioclase feldspar, 13 biotite, 17 amphibole, 9 pyroxene, 0 olivine
b. Fine-grained rock with 0 quartz, 0 potassium feldspar, 67 calcium-rich plagioclase feldspar, 0 biotite, 0 amphibole, 25 pyroxene, 8 olivine
c. Coarse-grained rock with 0 quartz, 0 potassium feldspar, 52 calcium-rich plagioclase feldspar, 0 biotite, 0 amphibole, 32 pyroxene, 16 olivine
d. Coarse-grained rock with 0 quartz, 0 potassium feldspar, 0 plagioclase feldspar, 0 biotite, 0 muscovite, 0 amphibole, 56 pyroxene, 44 olivine
e. Fine-grained rock with 32 quartz, 26 potassium feldspar, 26 sodium-rich plagioclase feldspar, 5 biotite, 11 amphibole, 0 pyroxene, 0 olivine
By reference to text Figure 4.3: Andesite, Basalt, Gabbro, Peridotite, Rhyolite

Answer to Question 2

Fractional crystallization: Removal of early-formed, relatively low-silica minerals leaves a melt that is more silica-rich.
Magma assimilation: Mafic magma may melt more silica-rich surrounding rock; the resulting silica-rich melt blends with the originally mafic magma to produce an intermediate or felsic magma.
Magma mixing: A mafic magma may mix with a felsic magma to produce an intermediate magma.


Related Topics

Need homework help now?

Ask unlimited questions for free

Ask a Question
« previous next »
 

Did you know?

Most strokes are caused when blood clots move to a blood vessel in the brain and block blood flow to that area. Thrombolytic therapy can be used to dissolve the clot quickly. If given within 3 hours of the first stroke symptoms, this therapy can help limit stroke damage and disability.

Did you know?

Asthma attacks and symptoms usually get started by specific triggers (such as viruses, allergies, gases, and air particles). You should talk to your doctor about these triggers and find ways to avoid or get rid of them.

Did you know?

During the twentieth century, a variant of the metric system was used in Russia and France in which the base unit of mass was the tonne. Instead of kilograms, this system used millitonnes (mt).

Did you know?

The cure for trichomoniasis is easy as long as the patient does not drink alcoholic beverages for 24 hours. Just a single dose of medication is needed to rid the body of the disease. However, without proper precautions, an individual may contract the disease repeatedly. In fact, most people develop trichomoniasis again within three months of their last treatment.

Did you know?

The people with the highest levels of LDL are Mexican American males and non-Hispanic black females.

The experimental approach used by Masui and Markert to identify cyclin and cyclin-dependent kinase ( The experimental approach used by Masui and Markert to identify cyclin and cyclin-dependent kinase (
Unique markings identify individual humpback whales. Unique markings identify individual humpback whales.
Postoperative hyperphagia and obesity in a rat with bilateral VMH lesions. (Based on Teitelbaum, ... Postoperative hyperphagia and obesity in a rat with bilateral VMH lesions. (Based on Teitelbaum, ...
Foundations of evidence-based practice. Foundations of evidence-based practice.
Summary of SOAP Note Content Cont. Summary of SOAP Note Content Cont.
Determining the Ages of Rocks Using Fossils Determining the Ages of Rocks Using Fossils
Video: Mechanisms of capillary exchange

For a complete list of videos, visit our video library