Paleomagnetism of younger volcanics from Western Timor, Indonesia

Wensink, H.; Hartosukohardjo, Suharno

doi:10.1016/0012-821x(90)90178-z

Cited by 14 publications

(5 citation statements)

References 8 publications

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“…The Eocene limestone of the Booi region is mixed with volcanics and unconformably overlies the metamorphics in a similar manner to the Lower Miocene limestone. A paleomagnetic signature that suggests an origin at around 17°N -adjacent Southeast Asiawas obtained by Wensink and Hartosukohardjo (1990) from the Eocene volcanics in the Booi region. Although this paleolatitude seems unrealistic in terms of possible plate movements, a northern hemisphere origin for these rocks is probable.…”

Section: Miocene Stratigraphic Units In Timormentioning

confidence: 99%

Re-evaluation of the Cablac Limestone at its type area, East Timor: Revision of the Miocene stratigraphy of Timor

Haig

McCartain

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et al. 2008

Journal of Asian Earth Sciences

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Section: Miocene Stratigraphic Units In Timormentioning

confidence: 99%

Re-evaluation of the Cablac Limestone at its type area, East Timor: Revision of the Miocene stratigraphy of Timor

Haig

McCartain

Keep

et al. 2008

Journal of Asian Earth Sciences

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“…On the contrary, the geology of Timor is very complicated, both in stratigraphy and in tectonics (Chamalaun and Grady 1978, Hamilton 1979, Barber 1981, Johnston and Bowin 1981, Wensink et al 1987. In Timor two main rock units can be distinguished which have nothing in common: (1) rocks which are largely exposed in the southern part of the island, and (2) rocks which occur in northern Timor.…”

Section: Sumba and Timormentioning

confidence: 99%

“…Northern Timor is built up of rock units which are completely unrelated to the southern series and, moreover, are quite different among themselves (Barber 1981, Audley-Charles 1985, Wensink and Hartosukohardjo 1990a. The basal sequence consists of metamorphics of possible Paleozoic age of the Lolotoi Complex (Table 1).…”

Section: Sumba and Timormentioning

confidence: 99%

Paleomagnetism of rocks from Sumba: tectonic implications since the late Cretaceous

Wensink

1994

Journal of Southeast Asian Earth Sciences

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“…Batuan ofiolit depan busur termasuk dalam Formasi Manamas [1]. Formasi Manamas telah dipelajari oleh beberapa peneliti [10][11][12] namun masih relatif sedikit dan belum menggambarkan karakteristik batuan beku secara lengkap. Penelitian ini diharapkan mampu memberikan informasi genesa dan proses yang terjadi dan mempengaruhi batuan, geokimia batuan, serta proses vulkanisme dalam kerangka tektonik yang terjadi di Pulau Timor.…”

Section: Pendahuluanunclassified

Karakteristik Geokimia Basal Alkali Formasi Manamas di Sungai Bihati, Baun, Pulau Timor

et al. 2021

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ABSTRAK Batuan beku Formasi Manamas di Sungai Bihati, Baun merupakan salah satu singkapan batuan beku di Pulau Timor yang belum banyak diteliti berdasarkan karakter geokimia. Penelitian ini bertujuan untuk mengetahui genesa dan proses yang terjadi pada batuan beku Formasi Manamas dalam kerangka tektonik yang terjadi di Pulau Timor berdasarkan analisis petrografi dan geokimia. Analisis geokimia dilakukan dengan menggunakan X-ray Fluorescence (XRF) dan Inductively Coupled Plasma-mass Spectrometery (ICP-MS) untuk mengetahui senyawa utama, unsur jejak, dan unsur tanah jarang. Batuan beku Formasi Manamas berupa intrusi basal dengan afinitas alkali yang menunjukkan pola pengayaan unsur tanah jarang yang identik dengan Ocean Island Basalt (OIB). Penelitian ini membuktikan adanya dua mekanisme pengayaan unsur yang berbeda yaitu fluid related enrichment yang berkaitan dengan aktifitas subduksi lempeng Samudra Hindia di bawah Busur Banda dan melt related enrichment yang diperkirakan berasal dari sisa lempeng Samudra Hindia yang patah yang masuk kedalam zona reservoir OIB. Kedua magma lalu bercampur dan mengalami underplating di bawah Busur Banda. ABSTRACT The igneous rock of Manamas Formation in the Bihati River, Baun is one of the igneous rock outcrops in Timor Island that has not been widely studied based on its geochemical characteristic. This study aims to determine the genesis and processes that occur in the igneous rocks of the Manamas Formation within tectonic framework of Timor Island based on petrographic and geochemical analysis. X-ray Fluorescence (XRF) and Inductively Coupled Plasma-mass Spectrometery (ICP-MS) were used to determine the major elements, trace elements, and rare earth elements. The igneous rock of the Manamas Formation is a basalt intrusion with an alkaline affinity which shown an enrichment pattern of rare earth elements identical to Ocean Island Basalt (OIB). This study proves the existence of two different mechanisms of elemental enrichment, fluid related enrichment which related to the subduction activity of the Indian Ocean plate under the Banda Arc and also melt related enrichment which originated from the broken Indian Ocean plate which enters the OIB reservoir zone. The two different magmas then mix and underplating beneath the Banda Arc.

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Paleomagnetism of younger volcanics from Western Timor, Indonesia

Cited by 14 publications

References 8 publications

Re-evaluation of the Cablac Limestone at its type area, East Timor: Revision of the Miocene stratigraphy of Timor

Re-evaluation of the Cablac Limestone at its type area, East Timor: Revision of the Miocene stratigraphy of Timor

Paleomagnetism of rocks from Sumba: tectonic implications since the late Cretaceous

Karakteristik Geokimia Basal Alkali Formasi Manamas di Sungai Bihati, Baun, Pulau Timor

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