>
>
Time management is very much important in IIT JAM. The eduncle test series for IIT JAM Mathematical Statistics helped me a lot in this portion. I am very thankful to the test series I bought from eduncle.
Nilanjan Bhowmick AIR 3, CSIR NET (Earth Science)
Gurmeet Singh posted an Question
October 05, 2020 • 20:45 pm
![]()
30 points
30 points
- IIT JAM
- Geology (GG)
Sir, please tell me the difference between arenite and graywache. also 2. please explain the 2nd fig also 3. sir what is sub arkose
Mudrocks Wackes Arenites 75 Quartzwacke Quartz arenite Quartz Sublithic Subarkose . arenite 25 Feidspathic Lithi 25 Lithic eraywacke rayeacke raywacke 50 15 Arkosic Lithic arenite Feldspar arenite Volcanic 50 arenite Rock fragments 50 Phylloarenite Calcithite 50 AMkOSe Arkose hos wac Arkosc wa Percent matrix <30 um
1 Answer(s)
Answer Now
- 1 Likes
- 3 Comments
- 0 Shares
-
![comment-profile-img]()
>
-
![comment-profile-img]()
>
Rahul kumar
A minor correction in the answer. Greywacke (a type of wacke) contains 15% to 75% matrix. I mistakenly wrote 50% in place of 75%.
-
![comment-profile-img]()
>
Rahul kumar Best Answer
Arenite contains less than 15% matrix whereas greywacke contains matrix amount in between 15% to 50%. The figure is indicating classification of sandstone. Depending on the %age of matrix, sandstones can be classified into Arenite and wacke. Arenite contains less than 15% matrix whereas wacke contains matrix amount in between 15 to 50%. Further in Arenite and wacke zone, sandstones can be further classified on the basis of modal composition of Quartz, Feldspar and lithic fragments. Arenites containing greater than 95% modal Quartz (normalised QFL) called as Quartz Arenite. Similarly, different zones can be classified. Sub arkose is an Arenite which contains feldspar amount in between 5 to 25%. If feldspar in Arenite exceeds 25% then the rock is classified as arkose.
Do You Want Better RANK in Your Exam?
Start Your Preparations with Eduncle’s FREE Study Material
- Updated Syllabus, Paper Pattern & Full Exam Details
- Sample Theory of Most Important Topic
- Model Test Paper with Detailed Solutions
- Last 5 Years Question Papers & Answers
Sign Up to Download FREE Study Material Worth Rs. 500/-
Sajan sarthak
Greywacke (a type of wacke) contains 15% to 75% matrix. Arenite contains less than 15% matrix whereas greywacke contains matrix amount in between 15% to 50%. Depending on the %age of matrix, sandstones can be classified into Arenite and wacke. Sub arkose is an Arenite which contains feldspar amount in between 5 to 25%. If feldspar in Arenite exceeds 25% then the rock is classified as arkose.