Preliminary Geology And Petrography Of Swat Kohistan

the southern part of the area under discussion. The group, according to them,
is older than the Lower Swafj-Buner Schistose Group of the Silnro-Devonian
age and is charscterised by a predominance of hornblende, containing hornblende
gneiss and schist, diorites, and other more basic rocks. Bakr and
Jackson (1964) have ahown a part of the Utror volcanio rocks, and the plutonic
roelrs to the south of &lam, along the river, on the geological map of Pakistan.
The former have been put in the palaeozoic/Mesozoic and the latter, which form
a part of the Hornblendic Group, in the Precambrian. King (1964) has
disatissed the granitic rocks and schists of Lower Swat in detail. Matsushita
(1965) brief3 y described the rocks of the Ushu Valley north of Ilolam and gave
tentative ages to some of them, along with an account of the glacial deposits.
More recently, Porter (1970) has discussed in detail the Pleistocene glacio, tion in
Sn-a t KO histan. Tahirlcheli (1959) studied the lead-zinc mineralization in the
Falakser area, and Sultan (1970) has classified some of the volcanic mcks near
Kalam into clacites.
Davie~ (1965) gave a brief description of the Eornblzndic Group and
considered the rocks to be mainly plutonic. Jan and Talzirkheli (1969) st~~died
these rocks in some detail from lower part of Pndus Kohiatan and pointed out
the abundance of narites in Upper Swat. Jan (1970) described the group from
Indus Kohistan a.nd southwestern GSlgit Agency in greater detail. The rocks
were divided into amphibolites, norites-diorites, alpine pcridotites and
granites. Tentative ages were assigned and the norites were considered to he
Cretaceous. The Hornblendic Gronp was also studied in the Shah Dheri-K:~bal
area (Rehmnn and Zeb, 19'70) and Mhwaza Khela (Shah and Sikandar, 1N'l).
The rocks of the Timurgara drea, Dir, an extension of the group, was studied
by Jan et a!. (19GB), Jan and Kempe (in preparation) have investigated the
petrology of diorites, norites, and amphibolites; the l~tter &re to the south of
%he areo. They think that the rocks represent a differentiated series later on
metarimphosed to amphibolite facies assemblagee in the south.
GENERAL- GEOLOGY AND PETBOGPCAPHY
The rocks of the Swat Kohistnn can be Lrosdly groupad into the i'olluwi~~g
subdivisions. Their stratigraphic and, especiully, structural relationships are
not yet clear In some cases.
C,