Tin-tungsten mineralization around the Cannibal Creek diapir,northeastern Australia: implications for exploration |
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| Authors: | Bateman R |
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| Institution: | (1) Department of Geology, James Cook University of North Queensland, 4811 Townsville, Qld., Australia;(2) Present address: Department of Geology, University of New Mexico, 87131 Albuquerque, N.M., USA |
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| Abstract: | Diapiric intrusion of the Cannibal Creek Granite into the metasediments of the Palaeozoic Hodgkinson Province, Queensland, formed a distinct and discrete set of aureole structures. The intensity of the aureole deformation increases towards the contact, and consists of a set of crenulations with mesoscopic folds, and a schistose cleavage within 500 m of the contact. The foliations in general parallel the intrusive contact, and are continuous with a foliation in the granite. Tin and tungsten mineralization is associated with this diapir. Mined at present as alluvials, the tin was probably originally derived from veins above cupolas of the pluton. Recognition of the structures formed by the intrusion of this diapiric granitoid can be useful in exploration. Assuming that aureole foliations are parallel to the contact in section, flat-lying foliations will indicate the location of the crestal region of a subsurface diapir. Careful mapping of aureole structures can identify areas where tin-tungsten mineralization is most likely to be found. |
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