784 C. Submarine Geology and Geophysics OLR(1979)26(12)

79:6032 Bjornsson, Axel, Gunnar Johnsen, Sven Sigurdsson,

Gunnar Thorbergsson and Eysteinn Tryggvason, 1979. Rifting of the plate boundary in north Ice- land 1975-1978. J. geophvs. Res., 84(B6): 3029-3038.

Magma pulses from the magma chamber below the Krafla caldera trigger plate movement along north Iceland's accreting plate boundary. This latest Neovolcanic Zone tectonic episode, following 100 years of quiescence, is characterized by short active rifting pulses at intervals of a few months, continuous caldera inflation of 7-10 ram/day between rifting pulses, horizontal extension of some 3 m in the Krafla caldera and associated fissure swarm, volcanic eruptions, fumarole formation, earthquake swarms and vertical ground movements of up to 2 m. National Energy Authority, Laugavegur 116, Reykjavik, Iceland. (izs)

79:6033 Byrne, Tim, 1979. Late Paleoeene demise of the Kula-

Pacific spreading center. Geology, 7(7): 341-344.

The end of spreading in the Late Paleocene along the Kula-Pacific Ridge is recorded in magnetic anomaly data, and may have been the result of partial subduction of the ridge beneath the Aleutian Arc, a model that limits Pacific Plate underthrusting and requires early Tertiary separation of southern Alaska from North America. Earth Sciences Board, University of California, Santa Cruz, Calif. 95064, U.S.A, (dine)

79:6034 Chingchang, Biq, 1978. Taiwan vis-a-vis New Guinea:

a comparison of their continent-arc collisions. Acta oceanogr. Taiwan., 8: 22-42.

Taiwan and New Guinea are similar examples of rare collision complexes and can be modelled by platform- foldbelt-arc successions in a continent-to-ocean direction. Similarities and distinguishing character- istics of the complex geological structures of the islands are discussed. P.O. Box 31, Taipei, Taiwan. (rio)

79:6035 Cole, J. W., 1978. Tectonic setting of Mayor Island

[New Zealand] volcano. N.Z. Jl Geol. Geophys.. 21(5): 645-647. Department of Geology, Victoria University of Wellington, Wellington, New Zea- land.

79:6036 Farrar, Edward, J. M. Dixon (discussion), S. E.

DeLong, P. J. Fox and F. W. McDowell (reply), 1979. Subduction of the Kula Ridge at the Aleutian Trench: [discussion]. Bull geol. Soc. Am., (I)90(7): 699-702.

79:6037 Le Pichon, Xavier, 1979. Bassins marginaux et col-

lision intracontinentale: exemple de la zone 6g6- enne. [Marginal basins and continental collision: the Aegean area.] C. r. hebd. S~anc. Acad. Sci.. Paris, (D)288(14): 1083-1086.

The Aegean area is a zone of active extension which overthrusts the Mediterranean lithosphere along the Hellenic Trench. This extension is a consequence of the relative migration of the subduction zone toward the south-west, as it is pulled by gravitational forces which dominate other forces in this context of continental collision. This model can be generalized. Laboratoire de G~odynamique, Universit6 Pierre-et- Marie-Curie, 4, place Jussieu, 75230 Paris Cedex 05. France.

79:6038 Mattson, P. H., 1979. Subduction, buoyant braking,

flipping, and strike-slip faulting in the northern Caribbean. J. Geol., 87(3): 293-304.

The distribution of metamorphics, ophiolites, Alpine- type ultramafics and volcanics in the Greater Antilles leads to a northern Caribbean model that indicates: (I) initial orogenic activity caused by a northward dipping subduction zone, (2) a cessation of subduction caused by buoyant continental crust entering from the south, and (3) a resumption of subduction, this time from the north. Department of Earth and Environmental Sciences, Queens College of the Cit~ University of New York, Flushing, N.Y. 11367, U.S.A. (fcs)

79:6039 Maurrasse, Florentin, John Husler, Gaston Georges,

Roman Schmitt and Paul Damond, 1979. Up- raised Caribbean Sea floor below acoustic reflec- tor B" at the southern peninsula of Haiti. Geologie Mijnb., 58(1): 71-83.

The Dumisseau Formation contains intercalated marie and pelagic rocks, Cretaceous in age, correlated through geophysical data with structure and composition of material below acoustic reflector B" of the Caribbean Sea floor, and appears to represent an uplifted block of Caribbean crust. Florida International University, Tamiami Trail, Miami, Fla. 33199, U.S.A. (dine)

79:6040 Robertson, A. H. F. and N. H. Woodcock, 1979.

Mamonia Complex, southwest Cyprus: evolution and emplacement of a Mesozoic continental margin. Bull. geol. Soc. Am., (I)90(7): 651-665.

Depositional evolution and subsequent deformation of the Mamonia Complex are investigated and discussed in conjunction with studies of Othris in central Greece and the Antalya Complex in Turkey. The results have a bearing on the geotectonic setting of the Troodos