ASM 5
Salt
Salt
Set of flashcards Details
| Flashcards | 28 |
|---|---|
| Language | English |
| Category | Nature Studies |
| Level | University |
| Created / Updated | 11.01.2013 / 11.01.2013 |
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two types of shallow sea evaportie formation
.
two main controls on large scale evaporites
atmosphere circulation
tectonics (eg. south americal and africa, cretaceous)
modern day evaporite examples
aral sea
death valley
3 key points of salt rehology
2 extra properties
weakness
ductility
incompressibility
impermeable
conductive
velocity in salt
4400m/s
what pressure does salt become ductile
2200kg/m3
three types of loading that can drive salt flow
gravitiational loading (hydraulic head)
displacement loading
thermal loading
reactive piercement
.
active piercement
.
erosional piercement
.
thrust piercement
.
four types of piercement in brittle overburden
.
2 types of piercement of ductile overburden
ductile piercement, if overburden is completely pierced passive diapirism occurs
reactive phase of salt diapirism
.
conditions of active diapirism in extensional setting
can only take place if salt is less dense than overburden
active diapirism occurs...
Subsequent to reactive diapirism if overburden has been thinned and weakened sufficiently for salt to pierce forcibly
evolutution of diapirism types
.
progression of diapirism type depends on ...
(3)
avilability of salt
sedimentation rate
total amount of extension
piercement during shortening
.
key differnece between piercement during shortening and passive piercement
bouyancy is main driver in passive, shortening is main driver in active
teardrop diapirism growth
.
suture above salt pedestal is called
feeder weld
four types of salt sheet advance
extrusive
open toed
thrusting
salt wings
extrusive sheet advance
.
extrusive sheet open-toed advance
.
extrusive sheet thrust advance
.
sheet advance: salt wings
.
falling down slope diaprism words to describe stretching and compression
updip extension and downdip contraction
