GENERAL PROSPECTING FOR URANIUM INTRUSIVE DEPOSITS IN BANGGAI-SULA

MICRO CONTINENTS, INDONESIA

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CONTENT

BRIEF URANIUM MINERALISATION IN INDONESIA

RECONSTRUCTION OF THE INDONESIA ARCHIPELAGO

GENERAL PROSPECTING FOR URANIUM INTRUSIVE DEPOSITS IN BANGGAI-SULA MICRO CONTINENTS

BRIEF URANIUM MINERALISATION

IN INDONESIA

Mineralisation Type

Rocks and Age Mineral Location Explanation

Sandstone Tertiary Sandstone

coffinite Sumatra Laurasia

Intrusive Cretaceous granite

uraninite Sumatra Laurasia

Metamorphite Permian -Carboniferous metamorphic

uraninite and pitchblende

Borneo Laurasia

Volcanic a. Tertiary rhyolite

Pitchblende Borneo Laurasia

b. Tertiary alkaline volcanic

Thorianite? Sulawesi Mix Laurasia and Gondwana?

Uranium mineralisation in Indonesia consists of :

Location of Uranium Mineralisation in Indonesia

Sandstone type in Sumatra Volcanic Type in Borneo

Metamorphite Type in Borneo

RECONSTRUCTION OF THE INDONESIA ARCHIPELAGO

Robert Hall, 2012

Indoneisa consists of part of Laurasia (Sumatra, Borneo,

Java) and part of Gondwana (SE Sulawesi, Banggai

Sula, Maluku, Timor, Papua)

Formation of the Indonesia Archipelago starting

from Late Jurassic :

Part of Indonesia consist of Sumatra (Laurasia) and

Sula, New Guinea, Argo Block, Banda (Gondwana).

Banda and Argo blocks apart from Australia and

moved to the north .

Banda Block (South West Banda) and Argo Block (East Java and

West Sulawesi) had moved far enough to the north separated

from Australia

SWB (South West Banda) and EJWS (East

Java West Sulawesi) move to the north and

getting closer to SE Asia

SWB and EJWS joined to Southeast Asia, forming an area called Sunda land.

Java and Borneo appear as a result of this merger .

Banda block ( SWB ) disappear and formed Borneo, while block Argo

( EJWS ) also disappear and formed Java, West Sulawesi and South Sulawesi .

Banda block ( SWB ) is missing and formed Kalimantan , while block Argo ( EJWS ) is also missing and formed Java , West Sulawesi and South Sulawesi .

India move rapidly to the north and its position was almost

pounding ASIA. Australia move to the north and Philippines arise

from the east. Borneo almost complete and North Sulawesi Arm

appear because of this interaction.

Islands around Philippines and

South China Sea arise cause of

complex interaction in

Philippine. North Sulawesi Arm

move to the West Sulawesi

Arm.

The movement of Australia ,

India and oceanic plate to the

north resulted in a change of

the position of Sundaland , the

rotation of Java , Sulawesi and

Kalimantan .

India continues move to the north,

crashed into Asia.

Australia move to the north and

then attached to the Sunda land.

Sula and Papua New Guinea

which is part of Australia, almost

in the position to day.

South East Sulawesi and Maluku

islands ( Seram and its vicinity )

Formed in this periods .

Situation 5 million years ago,

similar to now .

Since 5 million years ago until now, it seems not many major

changes occur . Of course there are small changes such as

formation of new islands or loss of old islands , formation of

new fault , and so on .

Indonesian Archipelago Now

GENERAL PROCPECTING IN BANGGAI SULA MICRO CONTINENT

The Banggai-Sula Microcontinent is interpreted as being a fragment of the Australia - New Guinea Continent that became detached during late Mesozoic times.

This is the result of collisions with subduction system along the eastern boundary of the Sunda Shelf that produce tectonic framework of Eastern Indonesia.

The island is believed to have originated from the northern boundary of the Australian Continent separated at the end of the Mesozoic or until Paleogene, and pushed along the Great Fault Sorong caused by the movement of the Philippine Sea Plate.

The basement of BANGGAI SULA MICRO CONTINENT is Carboniferous metamorphic rocks, intruded by Permian-Triassic Banggai granites associated with acid volcanic rocks of similar age.

The Permian-Triassic Banggai granites is a part of Tasmania granites Line so it is considered a potential for uranium intrusive deposits.

Background

Tasman Granites Line

Purpose

• General prospecting has been done in Banggai-Sula Micro Continents by using radiometric and geochemical mapping. The purpose is to localize the possibilities of uranium occurrences related to the intrusive rocks of the Permian to Triassic granites which are located in Banggai Sula micro continents but do not closed the opportunities of other deposits.

ther deposits.

GEOLOGY • Stratigraphy of Banggai - Sula Stratigraphy of Banggai Sula from old to young :

• Metamorphic rocks complex (Carboniferous)

• Menanga Formation (Permian)

• Mangole volcanic rocks (Permian)

• Banggai granites (Triassic – Late Permian)

• Bobong Formation (Lower Jurassic)

• Buya Formation (Middle Jurassic – Lower Cretaceous)

• Tanamu Formation (Upper Cretaceous)

• Salodik Formation (Palaeogene – Neogene)

• Peleng Formation (Quaternary)

.

Stratigraphic Column of Banggai Sula (Farid Ferdian 2010)

Structure Geology

Main faults in Banggai Sula area :

• Greyhound strait fault

• Batui thrust

• Sorong fault

• Sula thrust

• South Sula fault

Geological Map of Banggai-Sula Micro Continent

RADIOMETRIC DATA Table 1. Radiometric and U Content of the Rocks in Banggai Islands

Table 2. Radiometric and U Content of the Rocks in Sula Islands

GEOCHEMICAL DATA Table 3. U Content of Stream Sediment and Heavy Mineral in Banggai Islands

Table 4. U Content of Stream Sediment and Heavy Mineral in Sula Islands

ANOMALIES Number Location Lithology Characteristics

ANO.1 Peleng island Gneiss Radiometric 400 c/s

ANO.2 Bangkurung island

Granite Radiometric 600 c/s U content in HM 160.25 ppm

ANO.3 Peleng island Granite U content in HM 271.30 ppm

ANO.4 Banggai island Tuff Radiometric 270 c/s

ANO.5 Taliabu island Granite U content in the rock 34.63 ppm U content in SS 11.89 ppm U content in HM 960 ppm

ANO.6 Taliabu island Granite Radiometric 1200 c/s U content in rock 23.77 ppm U content in SS 12.4 ppm U content in HM 940 ppm

ANO.7 Taliabu island Quartzite U content in the rock 28.14 ppm

ANO.8 Taliabu island Granite U content in SS 18.3 ppm U content in HM 1004.64 ppm

Location of Radiometric and Geochemical Anomalies

DISCUSSION

• Result of general prospecting obtained 8 locations anomalies that consists of 2 anomalies located in metamorphic rocks complex, 1 anomaly in Volcanic Rocks and 5 anomalies in granites.

• Two anomalies in metamorphic rocks consists of radiometric anomaly in gneiss (400 c/s) and U content in Quartzite (28.14 ppm).

• One anomaly in volcanic rocks is radiometric anomaly in tuff (270 c/s).

• Five anomalies in Granites consists of radiometric, U content in granite, U content in stream sediment and U content in heavy minerals.

• One of five anomalies (ANO.6) in granite is interpreted to be related to the intrusive uranium deposits. Radiometric reading more than 1000 c/s SPP 2NF in the rocks usually give indication occurrences of uranium mineralization like in Sumatra and Borneo island.

CONCLUSION

• Result of the general prospecting in Banggai Sula, It was found 8 radiometric and geochemical anomalies, located in complex metamorphic rocks, Banggai granites and Mangole Volcanic Rocks. One anomaly in Banggai granite (ANO.6) are interpreted to be related to the intrusive uranium deposits.

• To know more clearly the occurrences of uranium deposits in these area, it was needed detail geological, radiometric and geochemical mapping especially in several anomalies areas.

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