Altermann, Wladyslaw

Helmcke, Dietrich

English

Open Access LMU

S03.21 SEDIMENTATION AND VOLCANISM DURING THE PERMIAN IN THE PETCHABUN BASIN, THAILAND W. A L T E R M A N N * & D, H E L M C K E (Institut fur Angewandte Geologie, FUB, Berlin) The Permian evolution of the Petchabun basin in Thailand reflects the late Variscan orogeny in SE-Asia. During the Permian, a N-S trending trough was flanked on its eastern side by a shelf, on which As-aelian to Murgabian carbonates and siliciclastics were deposited* The basement of the shelf was built up by an older orogenic belt (Dev«-Carb.), extending further to the east. The shelf led westwards into a pelagic basin. Further to the west, again platform carbonates are present* The carbonate sedimentation on the western plat­form was rarely interrupted by siliciclastic influx through Asselian to Midian times, Asselian and Sak-marian keratophyric to quartzkeratophyric tuffs and tuffites are interbedded with these sediments* Sub­sequently spilitic sills intruded these strata. In the pelagic Petchabun basin, deposition of ribbon cherts continued from Asselian to Kubergandian. In Lower Permian, allodapic limestones and tuffites were transported from the neighbouring platforms into the basin. The Middle Permian flysch sedimentation resulted from a strong orogenic activity* The basin was E-vergent, isoclinally folded and overthrusted. In its eastern parts Kubergandian to Midian raolasse was deposited. The intensity of folding of the mo-lasse decreases towards the east or the younger strata. The total width of the basin was probably not greater than 200 km* The pelagic sediments, flysch and molasse represent a thick pile of a coarsening-upwards sequence, typical of subduction related sutures. Folding affected a marginal marine basin and was caused by a westward directed subduction (A-subduction) under the volcanic arc. 114 

Sedimentation and volcanism during the Permian in the Petchabun Basin, Thailand

Universität München: Elektronischen Publikationen

S03.21 
SEDIMENTATION AND VOLCANISM DURING 
THE PERMIAN IN THE PETCHABUN BASIN, 
THAILAND 
W. A L T E R M A N N * & D, H E L M C K E 
(Institut fur Angewandte Geologie, FUB, Berlin) 
The Permian evolution of the Petchabun basin in 
Thailand reflects the late Variscan orogeny in 
SE-Asia. 
During the Permian, a N-S trending trough was 
flanked on its eastern side by a shelf, on which As-
aelian to Murgabian carbonates and siliciclastics 
were deposited* The basement of the shelf was built 
up by an older orogenic belt (Dev«-Carb.), extending 
further to the east. The shelf led westwards into a 
pelagic basin. Further to the west, again platform 
carbonates are present* 
The carbonate sedimentation on the western plat­
form was rarely interrupted by siliciclastic influx 
through Asselian to Midian times, Asselian and Sak-
marian keratophyric to quartzkeratophyric tuffs and 
tuffites are interbedded with these sediments* Sub­
sequently spilitic sills intruded these strata. 
In the pelagic Petchabun basin, deposition of ribbon 
cherts continued from Asselian to Kubergandian. In 
Lower Permian, allodapic limestones and tuffites 
were transported from the neighbouring platforms into 
the basin. 
The Middle Permian flysch sedimentation resulted from 
a strong orogenic activity* 
The basin was E-vergent, isoclinally folded and 
overthrusted. 
In its eastern parts Kubergandian to Midian raolasse 
was deposited. The intensity of folding of the mo-
lasse decreases towards the east or the younger 
strata. 
The total width of the basin was probably not 
greater than 200 km* The pelagic sediments, flysch 
and molasse represent a thick pile of a coarsening-
upwards sequence, typical of subduction related 
sutures. Folding affected a marginal marine basin 
and was caused by a westward directed subduction 
(A-subduction) under the volcanic arc. 
114 


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Sedimentation and volcanism during the Permian in the Petchabun Basin, Thailand

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