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

Wensink, H.

doi:10.1016/0743-9547(94)90065-5

Cited by 34 publications

(24 citation statements)

References 25 publications

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“…Preliminary paleomagnetic data were presented earlier by Chamalaun and Sunata (1982) and Wensink (1994). The results, in conjunction with the evidence from older rock series (Wensink, 19941, are consistent with a northern provenance, and are used to elucidate the island's emplacement in its present-day setting.…”

Section: Introductionsupporting

confidence: 55%

“…The rapid decrease in remanence intensity during progressive demagnetization as well as the rapid increase in intensity with the application of a direct N is the number of sites and N * is the number of specimens included in the final analysis; dp and dm are the semi-axes of the oval of 95% confidence; Palat. is the paleolatitude in degrees; [l] data from this paper: [2] data from Chamalaun and Sunata (1982);[3] data from Wensink ( 1994). field of increasing strength point to the significance of (titano)magnetite.…”

Section: Paleomagnetic Resultsmentioning

confidence: 99%

“…Paleomagnetic studies on rocks from Sumba of late Cretaceous and early Tertiary age revealed that in pre-Miocene times the fragment must have performed large rotational and translational movements. The original position of the Sumba fragment had a latitude of 18", most likely in the northern hemisphere (Wensink, 1994; see also Table 3). The majority of the geological arguments and recent isotopic evidence corroborates this hypothesis (Van der Borch et al, 1983;Audley-Charles et al, 1988;Rangin et al, 1990a, b;Vroon et al, 1995).…”

Section: Discussion and Implications For The Tectonic Emplacement Of mentioning

confidence: 99%

“…Recent summaries can be found in Fortuin et al (1994) and Wensink (1994). Structural and stratigraphic information on the adjacent Lombok and Savu basins has been given by Silver et al (19831, Karig et al (1987), Van Weering et al (1989) and Van der Werff et al (1994b, 1995a.…”

Section: Tectonic Setting Of the Sumba Continental Fragmentmentioning

confidence: 99%

“…The island is bounded on its west and its east side by deep fore-arc basins, the Sumba is generally regarded as an isolated microcontinent drifted away from an unknown original position. There are three different views on its provenance: (a) Sumba once formed part of the Australian continent from which it became detached, drifted away and performed a clockwise rotation (AudleyCharles, 1975;Norvick, 1979;Otofuji et al, 1981); (b) Sumba's original location was to the north at the margin of Southeast Asian Sundaland from which the fragment split off, drifted to the south and performed a large counterclockwise rotation (Von der Borch et al, 1983;Audley-Charles, 1985;AudleyCharles et al, 1988;Rangin et al, 1990a, Rangin et al, 1990bSimandjuntak, 1993;Wensink, 1994); (c) the fragment had an isolated position within the Tethys region in Mesozoic times (e.g., see Hamilton, 1979).…”

Section: Introductionmentioning

confidence: 99%

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The tectonic emplacement of Sumba in the Sunda-Banda Arc: paleomagnetic and geochemical evidence from the early Miocene Jawila volcanics

Wensink

Bergen

1995

Tectonophysics

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The island of Sumba is a continental fragment in the fore-arc region near the transition between the Sunda Arc and Banda Arc in southeastern Indonesia. Paleomagnetic and geochemical evidence from the early Miocene volcanics of the Jawila Formation in western Sumba constrain the final drift stage and tectonic emplacement of the island. The lavas range from predominantly andesites to dacites, and display textural evidence for a weak metamorphism. Rock magnetic and mineral chemical data point to pseudo-singleto multi-domain (titanojmagnetite (Fe,,,~,Ti,,_,O,), with grain sizes up to 10 pm, as the main carrier of remanence. The Jawila Formation reveals a ChRM direction with declination = 4.6", inclination = -19.2", c+ = 9.9" and a paleolatitude of 9.9"S, which corroborates earlier results (Chamalaun and Sunata, 1982). Taking paleomagnetic evidence from other formations on the island into account, we conclude that the Sumba fragment has occupied approximately its present position since the Miocene. The talc-alkaline affinity and trace-element signatures of the lavas point to an origin in an arc environment. This occurrence of subduction-related volcanic activity in the early Miocene on Sumba implies that a volcanic arc existed south of the present-day East Sunda Arc, or that the island was located within the latter arc between Sumbawa and eastern Flores, and still had a minor southward drift to cover.

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Section: Introductionsupporting

confidence: 55%

Section: Paleomagnetic Resultsmentioning

confidence: 99%

Section: Discussion and Implications For The Tectonic Emplacement Of mentioning

confidence: 99%

Section: Tectonic Setting Of the Sumba Continental Fragmentmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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The tectonic emplacement of Sumba in the Sunda-Banda Arc: paleomagnetic and geochemical evidence from the early Miocene Jawila volcanics

Wensink

Bergen

1995

Tectonophysics

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Tectonic evolution and geodynamics of the Neo-Tethys Ocean

Zhu

Zhao

2021

Sci. China Earth Sci.

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The Neo-Tethys Ocean was an eastward-gaping triangular oceanic embayment between Laurasia to the north and Gondwana to the south. The Neo-Tethys Ocean was initiated from the Early Permian with mircoblocks rifted from the northern margin of Gondwana. As the microblocks drifted northwards, the Neo-Tethys Ocean was expanded. Most of these microblocks collided with the Eurasia continent in the Late Triassic, leading to the final closure of the Paleo-Tethys Ocean, followed by oceanic subduction of the Neo-Tethys oceanic slab beneath the newly formed southern margin of the Eurasia continent. As the splitting of Gondwana continued, African-Arabian, Indian and Australian continents were separated from Gondwana and moved northwards at different rates. Collision of these blocks with the Eurasia continent occurred at different time during the Cenozoic, resulting in the closure of the Neo-Tethys Ocean and building of the most significant Alps-Zagros-Himalaya orogenic belt on Earth. The tectonic evolution of the Neo-Tethys Ocean shows different characteristics from west to east: Multi-oceanic basins expansion, bidirectional subduction and microblocks collision dominate in the Mediterranean region; northward oceanic subduction and diachronous continental collision along the Zagros suture occur in the Middle East; the Tibet and Southeast Asia are characterized by multi-block riftings from Gondwana and multi-stage collisions with the Eurasia continent. The negative buoyancy of subducting oceanic slabs can be considered as the main engine for northward drifting of Gondwana-derived blocks and subduction of the Neo-Tethys Ocean. Meanwhile, mantle convection and counterclockwise rotation of Gondwana-derived blocks and the Gondwana continent around an Euler pole in West Africa in non-free boundary conditions also controlled the evolution of the Neo-Tethys Ocean.

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Lithospheric mantle anisotropy from local events beneath the Sunda–Banda arc transition and its geodynamic implications

et al. 2020

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

Cited by 34 publications

References 25 publications

The tectonic emplacement of Sumba in the Sunda-Banda Arc: paleomagnetic and geochemical evidence from the early Miocene Jawila volcanics

The tectonic emplacement of Sumba in the Sunda-Banda Arc: paleomagnetic and geochemical evidence from the early Miocene Jawila volcanics

Tectonic evolution and geodynamics of the Neo-Tethys Ocean

Lithospheric mantle anisotropy from local events beneath the Sunda–Banda arc transition and its geodynamic implications

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