Hello,

where is your study area? It sounds as if you investigated marine sedimentary series. The only rock in your enumeration which can act as an "intrusion" is halite.

What I know is that only gypsum, calcite and quartz, are associated with intrusive rocks.

Christian is right.  In thick evaporite deposits halite often tends to migrate upwards through denser sedimentary sequences to form a diapiric intrusion or salt dome.  A gravity survey across the area would help to confirm it, in that halite is quite low density.

George

Dear Anthony,

All the evaporites (especialy halite, gypsum, anhydrite) could be intrusive due to their high plasticity relatively to their bounding rocks. If you add the loading and the heat of the depth, they represent zones of low cohesion, thus of high mobility which can be geologicaly expressed as decollement-detachment zones, through diapirism etc.

Regards

Ioannis

We are grateful to all of you for your valuable contributions. They are all very useful to us. Thanks once again.

in all the basins that have prograding enclosed  make the cycle of calcite , gypsum and halite. the variation in density make diapiric structures.

dear anthony

first of all the intrusive rocks you mention as structural then ok. if you mean the evaporite associated with intrusive rocks is something else.

but it is normal you can find evaporite rocks as cap due to gravity