Nambahin soal fissility, hasil 'googling' dari kamus 'gueede' bernama internet:
* Fissility. Whether or not a mudrock is fissile or non-fissile
depends on several factors.
1. The abundance of clay minerals. The more clay minerals
contained in the rock, the more likely the rock is to be fissile.
2. The degree of preferred orientation of the clay minerals. Small
clay minerals tend to adhere to one another if they collide during
transport. The tendency is increased by increased salinity of the
water and the presence of organic matter in the water. Adhesion of
small mineral grains is referred to as flocculation. If the clay
minerals flocculate, then they are less likely to have a preferred
orientation, and thus less likely to form rocks with fissility.
3. Bioturbation of organisms within or on the surface of the
sediment can disturb the preferred orientation of clay minerals, and
thus lead to a non-fissile rock.
4. If the clay minerals recrystallize during diagenesis they will
tend to do so with a preferred orientation with their (001) crystal
planes oriented perpendicular to the maximum principal stress
direction. (This process also results in slatey cleavage and
foliation in metamorphic rocks). If diagenesis occurs shortly after
deposition, then it is likely that the maximum principal stress
direction will also be oriented perpendicular to the bedding planes.
Dikutip dari:
http://www.tulane.edu/~sanelson/geol212/mudrocks.htm
Materi kuliah Geologi 212 dari Prof Stephen A. Nelson di Tulane
University, New Orleans, USA.
Salam
Min
On Tue, 8 Mar 2005 11:32:50 +0000, [EMAIL PROTECTED]
<[EMAIL PROTECTED]> wrote:
>
> betul, beli nengah yg benar. saya salah. padanan shale ya claystone itu,
> bukan siltstone.
>
> salam,
> syaiful
>
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