« previous next »

Author Question: Identify the following igneous rocks based on their texture and mineral content. What will be an ... (Read 31 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?

A serious new warning has been established for pregnant women against taking ACE inhibitors during pregnancy. In the study, the risk of major birth defects in children whose mothers took ACE inhibitors during the first trimester was nearly three times higher than in children whose mothers didn't take ACE inhibitors. Physicians can prescribe alternative medications for pregnant women who have symptoms of high blood pressure.

Did you know?

More than 34,000 trademarked medication names and more than 10,000 generic medication names are in use in the United States.

Did you know?

As of mid-2016, 18.2 million people were receiving advanced retroviral therapy (ART) worldwide. This represents between 43–50% of the 34–39.8 million people living with HIV.

Did you know?

Calcitonin is a naturally occurring hormone. In women who are at least 5 years beyond menopause, it slows bone loss and increases spinal bone density.

Did you know?

About 60% of newborn infants in the United States are jaundiced; that is, they look yellow. Kernicterus is a form of brain damage caused by excessive jaundice. When babies begin to be affected by excessive jaundice and begin to have brain damage, they become excessively lethargic.

A very high-resolution texture of the planet Mars A very high-resolution texture of the planet Mars
Romanian Adoptees’ Cognitive Abilities, by Age of Adoption The later the age of adoption, the lower Romanian Adoptees’ Cognitive Abilities, by Age of Adoption The later the age of adoption, the lower
When the O2S voltage rises above 450 mV, the PCM starts to control the fuel mixture based on ... When the O2S voltage rises above 450 mV, the PCM starts to control the fuel mixture based on ...
Summary of SOAP Note Content Summary of SOAP Note Content
Intrusive Igneous Bodies Intrusive Igneous Bodies
Gene content of mitochondrial genomes Gene content of mitochondrial genomes
Video: Pores and Ion Channels

For a complete list of videos, visit our video library