I assume Mullions represents the fold closure or hinge area. If I am correct, what kind of mineralization do we get? The rocks types are of the Proterozoic basin.
Dear Mr. Pdah,
mullion structures and boudinage form part of the structural geology of a rock unit. Per se, they are not indicative of special mineral deposits in terms of element composition but an expression of the kinematic effects operative in the host rock of the mineralization. I observed these structures during my field work only in pegmatitic and aplitic deposits, irrespective of their classification as barren or rare metal pegmatitic deposits.
With kind regards
H.G.Dill
Dear Damepaia,
May I recommend to you the publications of Gilbert Wilson (1953 and 1961) on mullion structures:
Wilson, Gilbert (1953) Mullion and rodding structures in the Moine series of Scotland. Geologists' Association Proceedings, v. 64, p. 118-151.
Wilson, Gilbert (1961) The tectonic significance of small scale structures and their importance to the geologist in the field. Société Géologique de Belge. Annales, tome 84, p. 423-548.
Best regards,
Guenter
Dear Damepaia,
I agree with Mr. Harald, that they represent the kinematic and rheological parameters of the unit. Only these structures are developed in the axial zone of a fold,they cannot be related to any type of mineralization. The zone could turn to be potential for any remobilized mineralization if you map the axial zone of a major fold. The fold characters (plunge, pitch, attitude of axial plane, kinematic factors) could be constrained by the orientation of the mullions, which would help you in planning boreholes or understanding structural controls of mineralizations (if any).
Best wishes
Nibin Tom
Dear Mr.Towe, Sir Tom, Mr.Grundmann and Mr.Dill. Thank you for your valuable responses. They are very helpful.
I encountered boudins which are plunging almost vertical during my geological mapping, in an attempt to understand the evolution of a shear zone which was triggered during the formation of tight and elongated dome and basin structures. I really need some references or help to clarify my above points.
I had asked the question simply to know what to expect when I carry on my work.
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