Stream Sediment Survey in SE Madagascar
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Copyright 2001 - 2015 by    Wolfgang Hampel
No part of the site may be reproduced without prior permission
madagascar_map

Stream Sediment Survey in South-Eastern Madagascar 2005 - 2006

A major stream sediment survey covering almost 15,000 km˛ in SE Madagascar started in mid-2005 and ended in 2008. The samples - 2,000 in total - were  analysed for a very wide range of elements (>50).

Source of map: routard.com

Fort-Dauphin area, south-eastern Madagascar
View from Fort-Dauphin towards the NE, the palaeodunes are rich in ilmenite and will soon be mined by Rio Tinto.

View from Fort-Dauphin towards the NE, the palaeodunes are rich in ilmenite and will soon be mined by Rio Tinto.
Ambinanibe Bay, west of Fort-Dauphin: quartzo- feldspathic gneiss, so- called leptynite, showing original sedimentary bedding

Ambinanibe Bay, west of Fort-Dauphin: quartzo- feldspathic gneiss, so- called leptynite, showing original sedimentary bedding
View fromTsitongambarika Parc towards the Andohahela Parc.

View fromTsitongambarika Parc towards Andohahela Parc.
Ankilitelo between Fort- Dauphin and Ambovombe: big subhedral garnet crystals in pegmatite.

Ankilitelo between Fort- Dauphin and Ambovombe: big subhedral garnet crystals in pegmatite.
Nepenthes madagascariensis, a typical carnivorous plant from the coastal plains.

Nepenthes madagascariensis, a typical carnivorous plant from the coastal plains.
cordierite_gneiss_st.luce_tn

Cordierite gneiss, St. Luce region
View into the Ranomafana Valley, north of Fort-Dauphin

View into the Ranomafana Valley, north of Fort- Dauphin
bauxite_cap_st.luce_tn

small bauxite showing derived from weathered leucocratic gneiss; St. Luce region

Andranondambo Sapphire Deposit, Manambolo Valley, Anosy Region:

View of the Manambolo Valley

View of the Manambolo Valley
Andronondambo Sapphire deposit: view of artisanal diggings. The miners follow subvertical plagioclasite veins which carry sapphire.

Andronondambo Sapphire deposit: view of artisanal diggings. The miners follow subvertical plagioclasite veins which carry sapphire.
Andronondambo Sapphire deposit: contact zone with small pyroxene and blue-green apatite crystals.

Andronondambo Sapphire deposit: contact zone with small pyroxene and blue-green apatite crystals.
Andronondambo Sapphire deposit: view of artisanal diggings.

Andronondambo Sapphire deposit: view of artisanal diggings.
Andronondambo Sapphire deposit: contact aureole (top right) in marble.

Andronondambo Sapphire deposit: contact aureole (top right) in marble.
Andronondambo Sapphire deposit: plagioclasite sample with a 5 mm sapphire crystal

Andronondambo Sapphire deposit: plagioclasite sample with a 5 mm sapphire crystal
Andronondambo Sapphire deposit: view of artisanal diggings.

Andronondambo Sapphire deposit: view of artisanal diggings.
Andronondambo Sapphire deposit: coarse recrystallized marble with small pyroxene and phlogopite crystals.

Andronondambo Sapphire deposit: coarse recrystallized marble with small pyroxene and phlogopite crystals.
Andronondambo Sapphire deposit: artisanal diggings in alluvial/eluvial sediments.

Andronondambo Sapphire deposit: artisanal diggings in alluvial/eluvial sediments.

Andronondambo Sapphire deposit: artisanal miner.

Andronondambo Sapphire deposit: artisanal miner.
Andronondambo Sapphire deposit: contact zone rich in small pyroxene crystals

Andronondambo Sapphire deposit: contact zone rich in small pyroxene crystals.

Manambolo Valley, Anosy Region: various localities
Abandoned artisanal phlogopite diggings near Besa-Esiva.

Abandoned artisanal phlogopite diggings near Besa-Esiva.

Scapolitite-boudins in a pyroxene rich layer in marble; from an outcrop near Besa-Esiva.

Scapolitite-boudins in a pyroxene rich layer in marble; from an outcrop near Besa-Esiva.
Phlogopite crystals from abandoned artisanal diggings near Besa-Esiva

Phlogopite crystals from abandoned artisanal diggings near Besa-Esiva.

Scapolite and titanite crystals in a pyroxene and wollastonite rich zone in marble; near Ambatotsivala

Scapolite and titanite crystals in a pyroxene and wollastonite rich zone in marble; near Ambatotsivala
Blastomylonitic zone near Ampilira.

Blastomylonitic zone near Ampilira.

Massive wollastonite from an outcrop near Besa-Esiva.

Massive wollastonite from an outcrop near Besa-Esiva.
Detail of blastomylonitic zone near Ampilira.

Detail of blastomylonitic zone near Ampilira.

Scapolitite-enclave with pyroxene-rich reaction rim in marble, (French “cipolin”) from an outcrop near Besa-Esiva.

Scapolitite-enclave with pyroxene-rich reaction rim in marble, (French “cipolin”) from an outcrop near Besa-Esiva.

Ankazoabo Sapphire Deposit, Manambolo Valley, Anosy Region
General view of abandoned Akazoabo Sapphire deposit: the miners followed subhorizontal plagioclasite veins in marble.

General view of abandoned Akazoabo Sapphire deposit: the miners followed subhorizontal plagioclasite veins in marble.
Akazoabo Sapphire deposit: traces of subhorizontal plagioclasite veins in marble. These veins carried small pockets of sapphire crystals

Akazoabo Sapphire deposit: traces of subhorizontal plagioclasite veins in marble. These veins carried small pockets of sapphire crystals
Akazoabo Sapphire deposit: detailed view of a humite-rich marble with a plagioclasite veinlet.

Akazoabo Sapphire deposit: detailed view of a humite-rich marble with a plagioclasite veinlet.

Marosohihy Uranothorianite Mine, Manambolo Valley, Anosy Region
General view of the Marosohihy Uranothorianite Mine, abandoned in 1969 (?), geologically it is a U-Th-skarn

General view of the Marosohihy Uranothorianite Mine, abandoned in 1969 (?), geologically it is a U-Th-skarn.
Marosohihy Mine: white plagioclase accumulations with corundum, see next photo.

Marosohihy Mine: white plagioclase accumulations with corundum, see next photo.
Marosohihy Uranothorianite Mine: contact zone of pyroxenite (left), granitic dikes and marble.

Marosohihy Uranothorianite Mine: contact zone of pyroxenite (left), granitic dikes and marble.
Marosohihy Mine: subhedral, bright blue corundum (3 cm wide) in white plagioclasite.

Marosohihy Mine: subhedral, bright blue corundum (3 cm wide) in white plagioclasite.
Marosohihy Uranothorianite Mine: contact zone of pyroxenite (left), granitic dikes and marble.

Marosohihy Mine: typical ore with uranothorianite crystals (black) in white plagioclase accumulations in pyroxenite.
Marosohihy Mine: typical phlogopite rich marble (“cipolin” in French); the marble may also contain uranothorianite.

Marosohihy Mine: typical phlogopite rich marble (“cipolin” in French); the marble may also contain uranothorianite.
fragmented_rock_tn

heat crack in gneiss boulder, Fenoeva region
bauxite_st.luce_tn

Bauxite concretion, iron-rich; St. Luce region
aquamarine_esira_tn

Aquamarine crystals from the Esira region, the top left crystal measures 5 cm

Scapolite crystals in a pyroxenite from an outcrop near Maroasara.

Scapolite crystals in a pyroxenite from an outcrop near Maroasara.
tafoni_sandstone_tn

Cross-bedded, subrecent sandstone showing tafoni erosion; Mitriaky Bay
ilmenite_fenoeva_tn

coarse ilmenite; Fenoeva region
quartz_crystals_esira_tn

Quartz crystals (amethyst, phantom, smoky quartz) from the Esira region; the lower crystal measures 25 cm in length
Wollastonite vein with scapolite in a pyroxenite from an outcrop near Maroasara.

Wollastonite vein with scapolite in a pyroxenite from an outcrop near Maroasara.
leptynite_st.luce_tn

Leucocratic gneiss (“leptynite); St. Luce region
rill_erosion_tn

rill erosion in granitic rock; Manodiso region
Marble with blue-green apatite crystals from Ambatotsivala

Marble with blue-green apatite crystals from Ambatotsivala