The Geology of Jandul Valley, Western Dir.
Abstract
The geology of Jandul Valley consists of Palaeozoic metamorphic rocks of amphibolite facies, intruded by Igneous rocks in Jurassic-Cretaceous times. The
plutonic rocks consist of an earlier phase of diorites, granodiorites, and granites
and an apparently later phase of norites, hornblendites, pyroxenites and peridotites.
The Mesozoic magmatism was followed by volcanic activity in the Tertiary
times. These, consisting of andesitic and dacitic tuffaceous rocks, are intimately
inter-bedded with fossiliferous metasedimentary rocks of phyllite grade. This
phase is characterized by the intrusion of porphyry dykes which were probably the
main feedes at the time. This was followed by a phase of granite and diorite dyke
intrusions. Next quartz and pegmatite veins formed, followed by a final stage of
dolerite dyke intrusions. Extensive sporadic copper-mineralization is associated
with the volcanism.
Structurally, the region is complexly folded and faulted. The main bodies of the intrusive and extrusive rocks seem to be located along a thrust zone. At least
three tectonic stages are discernible in the area.
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