Öz
Exploration planning is taking into
consideration, more and more, regional
concepts of rock and ore genesis. High
on the list of interesting regional targets
remain volcanogenic belts of Post-Paleozoic
ages. Of even broader scope are the
rapidly evolving concepts relating to plate
tectonics, Post-Eocene metallogenic
type are located on or near present - day
plate boundaries. Work is now in progress
to relate older provinces and older,
plate edges. This, it is to be hoped, will
lead to usable concepts which provide
new targets and new discorveries. In
the Alpide zone, Turkey, Greece and
Afghanistan seem to be likely areas for
porphyry copper discovery.
The new report, reviewing work, is
still underway in northern Chile and
Argentina. In this region mineralization
is consistently related to volcanism and
to granitic intrusive activity. A very extensive
suite of age determinations of
the rock has indicated a progressively
younger age both volcanics and intrusively
younger age both volcanics and
intrusives inward from the coast.
In other theories, porphyry copper
deposits may originate with partial melting
of oceanic crustal metarials as they
thrust under a continental plate along a
Benioff or «subducting» zone.
Many of the World's large porphyry
copper deposits are within zone or belts
of calc-alkaline rocks that are intimately
related to seismically active «Downgoing»
crustal plates. Many of the recent
discoveries of large copper deposits are
closely linked to the «ring of fire»
known Pacific belts and Alpide orogenic
belt.
Öz
Ayrıntılar
| Diğer ID | JA77RT28CZ |
|---|---|
| Bölüm | Araştırma Makalesi |
| Yazarlar | |
| Yayımlanma Tarihi | 1 Şubat 1974 |
| Gönderilme Tarihi | 1 Şubat 1974 |
| Yayımlandığı Sayı | Yıl 1974 Cilt: 13 Sayı: 2 |