People at Fort Hoofddijk

Hans Wensink

Dr. H. Wensink Paleomagnetic Laboratory
Fort Hoofddijk
Faculty of Earth Sciences, Utrecht University
Department of Earth Sciences Utrecht University
Budapestlaan 17, 3584 CD Utrecht
The Netherlands


Research of Hans Wensink
Paleomagnetism of Late Cretaceous rocks of Eastern Indonesia: geodynamic implications
back to Hans's homepage During the Indonesian Snellius-II Expedition, paleomagnetism was one of the research topics. Dutch and Indonesian colleagues visited a number of islands in the Banda Sea, in eastern Indonesia.

Rocks were sampled mainly on the islands of Timor and Misool. From Timor, successful results could be obtained from rocks with ages between Permian and Pliocene. On Misool, late Cretaceous sediments provided useful data.

The paleomagnetic studies contribute to the understanding of the position of eastern Indonesian micro continents through time, relative to the Australian continent.

Post-Snellius-II research has been carried out on the island of Sumba, with specialists in marine geology, paleontology, sedimentology and paleomagnetism. The southeast Indonesian island of Sumba is a continental fragment, situated within the transition zone from the Sunda Arc to the Banda Arc.

The origin of Sumba was, for a long time, a matter of dispute. Both igneous and sedimentary rocks have been sampled for paleomagnetic and geochemical research as well as for age dating. The sampled formations include rocks of late Cretaceous through Pliocene age.

The paleomagnetic data could be interpreted in terms of an originally low latitudinal position of the micro continent on the southern hemisphere. In addition, Sumba underwent a large counterclockwise rotation since the late Cretaceous of more than 90°.

The Sumba micro continent originally formed part of the Sunda platform and, most likely, became detached from eastern Sundaland in the late Cretaceous. Geochemical studies and 40Ar/39Ar dating on igneous rocks largely contributed to the understanding of the structural history of this isolated island.

publicationsPublications of Hans Wensink

  • Fortuin, A.R., van der Werff, W. and Wensink, H. (1997). Neogene basin history of a rifted and inverted forearc region, on- and offshore Sumba (Eastern Indonesia). J. Southeast Asian Earth Sci., 15, 61-88.
  • Wensink, H. (1997). Palaeomagnetic data of late Cretaceous rocks from Sumba, Indonesia; the rotation of the Sumba continental fragment and its relation with eastern Sundaland. Geol. Mijnbouw, 76, 57-71.
  • Wensink, H. and van Bergen, M.J. (1995). The tectonic emplacement of Sumba in the Sunda-Banda Arc: paleomagnetic and geochemical evidence from the early Miocene Jawila volcanics. Tectonophysics, 250, 15-30.
  • Wensink, H. (1994). Paleomagnetism of Rocks from Sumba: Tectonic Implications since the Late Cretaceous. J. Southeast Asian Earth Sci., 9, 51-65.

  • Wensink, H. (1991). Late Precambrian and Paleozoic rocks of Iran and Afghanistan. In: M. Moullade and A.E.M. Nairn (eds.), The Phanerozoic Geology of the World I, The Paleozoic, A. Elsevier Science Publishers, Amsterdam, 147-218.
  • Wensink, H. (1991). The paleoposition of the Island of Sumba, derived from paleomagnetic data. Proc. LIPI Silver Jubilee Symposium 'Dynamics of subduction and its Products' (Yokyakarta, Indonesia), 238-244.
  • Wensink, H. (1991). Paleomagnetism of rocks from Sumba: tectonic implications since the late Cretaceous. Proc. Intern. Seminar on Geodynamic Processes (Bandung, Indonesia), 50-54.
  • Wensink, H., Hartosukohardjo, S. and Suryana, Y. (1989). Paleomagnetism of Cretaceous sediments from Misool, Northeastern Indonesia. Neth. J. Sea Res., 24, 287-301.1984
  • Wensink, H. (1988). Displaced terrains of Gondwana origin in Indonesia: paleomagnetic implications. Ann. Soc. Géol. Nord, CVII, 81-87.
  • Wensink, H. (1987). Comments on "Deccan flood basalts at the Cretaceous-Tertiary boundary ?" by V. Courtillot, J. Besse, D. Vandamme, R. Montigny, J.-J. Jaeger and H. Cappetta. Earth planet. Sci. Lett., 85, 326-328.
  • Wensink, H., Hartosukohardjo, S. and Kool, K. (1987). Paleomagnetism of the Nakfunu Formation of Early Cretaceous age, Western Timor, Indonesia. Geologie en Mijnbouw, 66, 89-99.
  • Kuijpers, A. Troelstra, S.R. Verbeek, J.W. Wensink, H. and de Wolf, H. (1984). Paleoceanic conditions in the Canary Basin, Eastern North Atlantic, since 1.4 M.A. BP: evidence from the deep-water sedimentary record. Meded. Rijks Geol. Dienst, 38(2), 215-230.
  • Wensink, H. (1984). Paleomagnetism of three deep-sea piston cores recovered from the Madeira Abyssal Plain. Meded. Rijks Geol. Dienst, 38(2), 169-181.
  • Wensink, H. (1983). Paleomagnetism of red beds of Early Devonian age from Central Iran. Earth planet. Sci. Lett., 63, 325-334.
  • Wensink, H. (1982). Tectonic inferences of paleomagnetic data from some Mesozoic formations in Central Iran. Geophys. Journal, 51, 12-23.
  • Wensink, H. (1981). Le contact Gwondwana-Eurasie en Iran d'apres les recherches paléomagnetiques. Bull. Soc. geol. France 7, XXIII, 6, 547-552.
  • Wensink, H. (1981). Pre-Cenozoic Paleomagnetism of Southern Europe/Middle East. In: M.W. McElhinny and D.A. Valencio (editors), Geodynamic Series, vol. 2, Palaeoreconstructions of the continents, 151-157.
  • Wensink, H. and Varekamp, J.C. (1980). Paleomagnetism of basalts from Alborz: Iran part of Asia in the Cretaceous. Tectonophysics, 68, 113-129.
  • Wensink, H. (1979). The implications of some paleomagnetic data from Iran for its structural history. In: W.J.M. van der Linden (editor), Fixism, mobilism and relativism: van Bemmelen's search for harmony. Geologie en Mijnbouw, 58, 175-185.1972
  • Wensink, H., Zijderveld, J.D.A. and Varekamp, J.C. (1978). Paleomagnetism and ore mineralogy of some basalts of the Geirud Formation of Late Devonian-Early Carboniferous age from the Southern Alborz, Iran. Earth Planet. Sci. Lett., 41, 441-450.
  • Wensink, H., Boelrijk, N.A.I.M., Hebeda, E.H., Priem, H.N.A., Verdurmen, E.A.T. and Verschure, R.H. (1977). Paleomagnetism and radiometric age determinations of the Deccan Traps, India. IV International Gondwana Symposium, Calcutta (India). Hindustan publishing corporation, Delhi (India), 832-849.
  • Wensink, H. (1975). The structural history of the India-Pakistan subcontinent during the Phanerozoic. In: Borradaille, G.J. et al. (editors), Progress in geodynamics, 190-207. North-Holland Publ.Cy., Amsterdam.
  • Wensink, H. (1975). The paleomagnetism of the Speckled Sandstones of Early Permian Age from the Salt Range, Pakistan. Tectonophysics, 26, 281-292.
  • Wensink, H. (1973). Newer paleomagnetic results of the Deccan Traps, India. Tectonophysics, 17, 41-59.
  • Wensink, H. (1973). The India-Pakistan Subcontinent and the Gondwana reconstructions based on paleomagnetic results. In: Tarling, D.H. and Runcorn, S.K. (editors), Implications of continental drift to the earth sciences, 1, 103-116. Academic Press, London-New York.
  • Wensink, H. (1972). A note on the Paleomagnetism of the Lower Siwaliks near Choa Saiden Shah, Potwar Plateau, West Pakistan. Pakistan J. Sci. Ind. Res., 15, 89-91.
  • Wensink, H. (1972). The paleomagnetism of the Salt Pseudomorph Beds of Middle Cambrian age from the Salt Range, West Pakistan. Earth Planet. Sci. Lett., 16, 189-194.
  • Wensink, H. and Klootwijk, C.T. (1971). Paleomagnetism of the Deccan Traps in the Western Ghats near Poona (India). Tectonophysics, 11, 175-190.
  • Wensink, H. (1970). The Significance of Paleomagnetism for the Stratigraphy of Plateau Basalts with an Application to the Coiron Lavas, Ardêche,France. In: Runcorn, S.K. (editor), Palaeogeophysics, 209-222. Academic Press, London.
  • Wensink, H. and Kloootwijk, C.T. (1968). The paleomagnetism of the Talchir Series of the Lower Gondwana System, Central India. Earth. Planet. Sci. Lett., 4, 191-196.
  • Wensink, H. (1968). Paleomagnetism of some Gondwana Red Beds from Central India. Palaeogeogr. Palaeoclimat. Palaeoecol., 5, 323-343.
  • MacDougall, I and Wensink, H. (1966). Paleomagnetism and geochronology of the Plio-Pleistocene lavas in Iceland. Earth Planet. Sci. Lett., 1, 232-236.
  • Opdyke, N.D. and Wensink, H. (1966). Paleomagnetism of rocks from the White Mountain plutonic-volcanic series in New Hampshire and Vermont, U.S.A. J. geophys. Res., 71, 3045-3051.
  • Wensink, H. (1964). Secular variation of Earth magnetism in Plio-Pleistocene basalts of Eastern Iceland. Geologie en Mijnbouw, 43, 403-413.
  • Wensink, H. (1964). Paleomagnetic stratigraphy of younger basalts and intercalated Plio-Pleistiene tillites in Iceland. Geol. Rundschau, 54, 364-384.
  • Wensink, H. (1962). Paleozoic of the upper Gàllego and Ara valleys, Huesca Province, Spanish Pyrenees. Estudios Geologicos, XVIII, 1-74.
  • ten Haaf, E. and Wensink, H. (1962). Geological solar compasses. Geol. Rundschau, 52, 541-548.
  • Schuiling, R.D. and Wensink, H. (1962). Porphyroblastic and poikiloblastic textures (the growth of large crystals in a solid medium). Neues Jahrb. f. Mineralogie, Mh 11/12, 247-254.
  • Rutten, M.G. and Wensink, H. (1960). Paleomagnetic dating, glaciations and the chronology of the Plio-Pleistocene in Iceland. Int. Geol. Congress, XXI Session, Norden, part IV, 62-70.
  • Rutten, M.G. and Wensink, H. (1960). Structure of the Central Graben of Iceland. Int. Geol. Congress, XXI Session, Norden, part XVIII, 81-88.
  • Rutten, M.G. and Wensink, H. (1959). Geology of the Hvalfjördur-Skorradalur area (Southwestern Iceland). Geologie en Mijnbouw N.S., 21, 172-181.
  • Cup, C. and Wensink, H. (1959). The lead-zinc ores of Yenefrito near Panticosa (Spanish Pyrenees). Geologie en Mijnbouw N.S., 21, 434-444.