The geological evolution of Northern Sumatra

Cameron, Nick

doi:10.29118/ipa.619.149.187

Cited by 50 publications

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“…The majority of these form the Woyla Group (Cameron et al 1980;Barber 2000) and represent the volcanic products of the intra-oceanic Woyla Arc that was accreted to the SumatraSundaland margin in the early Late Cretaceous. There are also abundant Late Jurassic and Early Cretaceous I-type plutons that formed along the active margin (McCourt et al 1996) as well as associated volcanic products such as Early Cretaceous andesites that occur in the Ombilin Basin (e.g.…”

Section: Subduction and Magmatismmentioning

confidence: 99%

A record of continental collision and regional sediment flux for the Cretaceous and Palaeogene core of SE Asia: implications for early Cenozoic palaeogeography

Clements

Hall

2011

JGS

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Section: Subduction and Magmatismmentioning

confidence: 99%

A record of continental collision and regional sediment flux for the Cretaceous and Palaeogene core of SE Asia: implications for early Cenozoic palaeogeography

Clements

Hall

2011

JGS

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“…Beckinsale, 1979). In mainland Sumatra at this time oblique subduction of the Indian oceanic plate led to the destruction of a Mesozoic marginal basin assemblage along the line now represented by the Sumatran Fault System (Cameron et al, 1980). Presently, virtually all the Sn and W production Mitchell (1979), Hutchinson and Taylor (1978), and Beckinsale (1979).…”

Section: Regional Setting and Economic Implicationsmentioning

confidence: 99%

“…It is into this basement that the Hatapang granite was emplaced. The basement rocks, belonging to the Tapanuli Group, consist of a thick sequence of greywackes and diamictites which are similar to and correlate with formations in mainland SE Asia, all of which are of probable Gondwana affinity (Cameron et al, 1980;Metcalfe, 1983). The diamictites are usually unbedded, unfossiliferous and sometimes contain pebbles and cobbles of granite, gneiss, marble and quartzite, all of which indicate a continental provenance.…”

Section: Introductionmentioning

confidence: 99%

“…This was carried out as a technical cooperation project between the British Geological Survey and the Indonesian Directorate of Mineral Resources. Details of the project are given by Page et al (1978) and a summary account of the geology by Cameron et al (1980). Results of the stream sediment geochemical survey are available in atlas form for 15 elements at 1:2 500000 current fault system (Sumatra Fault Zone) running the length of its western edge (Fig.…”

Section: Introductionmentioning

confidence: 99%

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Geochemistry, mineralogy and plate tectonic setting of a Late Cretaceous Sn-W Granite from Sumatra, Indonesia

Clarke

Beddoe-Stephens

1987

Mineral. mag.

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The Hatapang granite was discovered during geological mapping and mineral exploration in northern Sumatra by the British Geological Survey in conjunction with the Indonesian Directorate of Mineral Resources. The pluton comprises a two-mica granite which shows significant greisenization and veining around its margins associated with Sn and W mineralization. An Rb-Sr isochron derived for the pluton indicates an age of 80 Ma and an initial S7Sr/S6Sr ratio of 0.7151. This together with major and trace element data show the Hatapang to be of clear S-type affinity.The greisens are quartz mica topaz rocks and are almost totally deficient in Na. Trioctahedral mica compositions progress from biotite through siderophyllite to zinnwaldite during final differentiation and greisenization of the granite. Accompanying dioctahedral micas are phengitic. Associated with late-stage differentiation of the granite is the precipitation of tourmaline and various Nb-Ta oxides. Sn and W mineralization is manifested as cassiterite in the greisens, while wolframite tends to be related to quartz veining. A later and lower temperature sulphide event produced a suite of base metal sulphides and Ag-Bi-Pb sulphosalts. The identification of a Sn-W granite of Cretaceous age in northern Sumatra provides a link with occurrences of economically important Late Cretaceous Sn-W granites in Thailand and Burma and increases the potential of an area which until recently was thought to lie outside the SE Asian tin belt.

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“…The geochronological rock data lead to an understanding that the island consists of several parts of micro continents, namely Sikuleh Continental Fragment, Natal Continental Fragment, and three micro continents, such as Mergui Micro Continent, Malaka Micro Continent and East Malaya Micro Continent (Cameron et al, 1980;Pulunggono and Cameron, 1984). Along the western side, between the Sikuleh and Natal continental fragments with the Mergui Micro Continent, the Woyla Terrains (Mesozoic in age) extent from NW to SE ( Figure 2).…”

Section: Introductionmentioning

confidence: 99%

Geochemical Evidence of Island-Arc Origin in Volcanic Rocks of Central Sumatera

Zulkarnain¹

2014

J.Ris.Geo.Tam

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Geochemical study on volcanic in Lampung and Bengkulu regions proposed a preposition that the western part of Sumatera is formed by a separated fragment with island-arc character and does not belong to continental margin of Eurasia. Geochemical signatures of western and eastern volcanic in Central Sumatera have confirmed the preposition indicated by evidences of existing island-arc tectonic environment on the western volcanic and both island-arc and continental tectonic environments on the eastern volcanic. Besides that, the geochemical data in this region have revealed the third tectonic environment reflecting development of back-arc tectonic setting in the geological history of the island. The island-arc tectonic setting is marked by higher ratio of (Ti/Ce)N, varying from 0.15 to 0.3, but in narrow ratio of (Ta/Nb)N, between 1.0 to 1.5, while the Active Continental Margin tectonic environment is characterized by wide range of (Ta/Nb)N ratio, ranging from 1.2 to 2.8 but with ratio of (Ti/Ce)N less than 0.1. The back-arc basin tectonic setting is marked by high ratio of (Ti/Ce)N, up to more than 0.8. The results are made based on rock chemistry analysis including major, trace and rare earth elements.Keywords: geochemical, volcanic, Sumatera, island-arc, continental, preposition, back-arc basin. ABSTRAK. Studi geokimia batuan gunungapi di wilayah Lampung dan

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The geological evolution of Northern Sumatra

Cited by 50 publications

References 0 publications

A record of continental collision and regional sediment flux for the Cretaceous and Palaeogene core of SE Asia: implications for early Cenozoic palaeogeography

A record of continental collision and regional sediment flux for the Cretaceous and Palaeogene core of SE Asia: implications for early Cenozoic palaeogeography

Geochemistry, mineralogy and plate tectonic setting of a Late Cretaceous Sn-W Granite from Sumatra, Indonesia

Geochemical Evidence of Island-Arc Origin in Volcanic Rocks of Central Sumatera

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