Preliminary mapping of the trench exposures shows that the massive sulphides (chalcopyrite dominant) are hosted within structurally controlled fault-breccias that occur within a sequence of metasedimentary rocks and a white, medium-grained monzonite
The trend is defined geologically by a zone of structural disruption, pervasive quartz-sericite-pyrite (QSP) alteration and local potassic alteration that follows an elongate intrusion of Lower Jurassic monzodiorite and monzonite
. This trend includes several known gold-silver vein and copper-gold porphyry occurrences including Castle, Castle Central, Castle East, A9 and Tuk on Colorado's Castle Property and Saddle South and Saddle North on GT Gold's Tatogga Property1.
It has been recognised that previous drilling was proximal to this zone of mineralisation and previously reported higher grades were associated with intrusive monzonite
stocks supporting this association.
Mineralization is hosted within stockwork quartz veins, some of which are associated with zones of shearing and brecciation within the host Monzonite
By modifying magnetic susceptibility values, a reasonable overlap of calculated and observed magnetic fields was achieved for physical properties that resemble those of the Taadikvere quartz monzonite
, Abja quartz monzodiorite and Sigula gabbro-diabase intrusions (models 6, 8 and 9 in Table 1 and Fig.
Saw sampling over the area outlined quartz monzonite
rocks with pyrite and oxidized pyrite being the dominant sulphide mineral along with minor Chalcopyrite, Chalcosine, Molybdenite and Malachite (Oxide).
The granite is a porphyritic monzonite
with an average unit weight of about 2.69 g/[cm.sup.3].
These structures are present in the Barit monzonite
pluton near the contact with Rakaposhi volcanics.
The main ore bodies occur in the fault basin at the edge of the northwestern rock body of the Tonglushan, near the contact zone of the dolomitic marble, the quartz monzonite
diorite porphyry, and quartz diorite in the Lower Triassic Jialingjiang Formation, and near the different lithology and the echelon fracture of dolomitic marble.
The Dusi (Garba Tula) sapphire deposit, central Kenya--A unique Pan-African corundum-bearing monzonite
. Journal of African Earth Sciences, 38(4), 401-410, http://dx.doi.
The volcanic strata mainly consist of basalt, trachybasalt, andesite, and basaltic andesite that are intruded by monzonite
, monzodiorite, granodiorite, and syenite.
Meantime gd intrusive bodies with Hornblende granodiorite to monzonite
permeated between meta-gabbro and limestone.