Andranondambo Azure analysis ( Madagascar )
31 December 18:00
Andranondambo Azure analysis ( Madagascar ) by Alain Darbellay GGGems
© 2004 gggems.com All rights reserved.
Tranomaro in 1991 >>
Geographical analysis
We will distinguish:
1 the agitable solid accumulation of
Androy, it is covered with
thorny backcountry and meadows.
2 the gneissic area of to
Mandrarean Androy, fields
plains and hills, attenuate zones
of savanna on of red arena At the time
calcareous carapace. of the abundant
Altitude varies there from boredom in
600 meters on the hills the south.
to 250 meters at the bottom.
3 the western abruptness of the top Anosyans
chains which acme are staged amid
1500 and 2000 meters. It is a acreage of
meadows.
Geological divisions.
1 Apparent schists.
Gneiss with diopside, syenitic eysies
gneisses, arteritic injections, gneiss at
cordierite, etc.
2 Old atomic rocks.
Pegmatites, Dissogénites, Esirians
granites , charnockites, kalambatreans
granites, backward granites .
3 Contempo atomic rocks.
(Volcanic solid accumulation of Androy)
a) A the base, a blubbery basaltic
subhorizontale alternation .
b) Basaltic dykes. On the alley to Andranondambo
c) A blubbery college subhorizontale rhyolitic series.
d) Rhyolitic dykes .
4 Contempo formations.
If russet-red bank are excluded, the contempo
formations accept alone a actual anemic development.
It is all-important to adduce the alluvial plains of
Androtsy, Esira, Sangoria and Pisopiso.
A notable calcareous carapace covers alotof of the area.
Metamorphized dolomitic limestone.
Near Andranondambo
The anosyans granites are admired as synorogenes, eocambrians
formed in the androyans alternation to which an age college than 2400 MY
is allotted.
The esirians granites present actual capricious crushings of acuteness which
often accord them a gneissic facies .
There is sometimes access to orthogneisses. Accepted foliation is sub meridian.
The occurrences of the Andranondambo breadth were industrially exploited back 1993 and accept been
almost alone few years later. Actually, it is actual difficult to accomplishment azure absolute in
mother rock, because corundum is not concentrated enough. Furthermore, the acerbity of the
rock makes its corruption actual expensive.
¦ MADAGASCAR GEM Carnival ¦ ABOUT ILAKAKA ¦ MADAGASCAN CORUNDUMS ¦
Aback to top Litho analysis Minerals Beneficiary s Cabochons Adjustment agreement Acquaintance us
All the pictures on this website accept been attempt by gggems.com
© 1987 - 2004 GGGems, All rights reserved.
Andranondambo Azure analysis ( Madagascar ) by Alain Darbellay GGGems
© 2004 gggems.com All rights reserved.
Tranomaro in 1991 >>
Geographical analysis
We will distinguish:
1 the agitable solid accumulation of
Androy, it is covered with
thorny backcountry and meadows.
2 the gneissic area of to
Mandrarean Androy, fields
plains and hills, attenuate zones
of savanna on of red arena At the time
calcareous carapace. of the abundant
Altitude varies there from boredom in
600 meters on the hills the south.
to 250 meters at the bottom.
3 the western abruptness of the top Anosyans
chains which acme are staged amid
1500 and 2000 meters. It is a acreage of
meadows.
Geological divisions.
1 Apparent schists.
Gneiss with diopside, syenitic eysies
gneisses, arteritic injections, gneiss at
cordierite, etc.
2 Old atomic rocks.
Pegmatites, Dissogénites, Esirians
granites , charnockites, kalambatreans
granites, backward granites .
3 Contempo atomic rocks.
(Volcanic solid accumulation of Androy)
a) A the base, a blubbery basaltic
subhorizontale alternation .
b) Basaltic dykes. On the alley to Andranondambo
c) A blubbery college subhorizontale rhyolitic series.
d) Rhyolitic dykes .
4 Contempo formations.
If russet-red bank are excluded, the contempo
formations accept alone a actual anemic development.
It is all-important to adduce the alluvial plains of
Androtsy, Esira, Sangoria and Pisopiso.
A notable calcareous carapace covers alotof of the area.
Metamorphized dolomitic limestone.
Near Andranondambo
The anosyans granites are admired as synorogenes, eocambrians
formed in the androyans alternation to which an age college than 2400 MY
is allotted.
The esirians granites present actual capricious crushings of acuteness which
often accord them a gneissic facies .
There is sometimes access to orthogneisses. Accepted foliation is sub meridian.
The occurrences of the Andranondambo breadth were industrially exploited back 1993 and accept been
almost alone few years later. Actually, it is actual difficult to accomplishment azure absolute in
mother rock, because corundum is not concentrated enough. Furthermore, the acerbity of the
rock makes its corruption actual expensive.
¦ MADAGASCAR GEM Carnival ¦ ABOUT ILAKAKA ¦ MADAGASCAN CORUNDUMS ¦
Aback to top Litho analysis Minerals Beneficiary s Cabochons Adjustment agreement Acquaintance us
All the pictures on this website accept been attempt by gggems.com
© 1987 - 2004 GGGems, All rights reserved.
|
Tags: solid, series, meters andranondambo, granites, gggems, madagascar, sapphire, ¦, recent, series, androy, discovery, meters, , discovery madagascar, sapphire discovery, andranondambo sapphire, andranondambo sapphire discovery, sapphire discovery madagascar, volcanic solid mass, discovery madagascar andranondambo, madagascar andranondambo sapphire, |
Share Andranondambo Azure analysis ( Madagascar ):
Text link code :
Hyper link code:
Also see ...
PermalinkArticle In : Reference & Education - Education
