OLR (1985) 32 (12) D. Submarine Geology and Geophysics 1027

D240. Local or regional tectonics

85:7143 Barrier, E., 1985. The two stage collision of Taiwan:

an active orogen. Tectonophysics, 115(1-2):167- 175.

Collision of the Hengchun Ridge, an accretionary wedge, with the Chinese continental margin, was followed by collision of the Luzon Trough and volcanic arc, from the Philippine Sea Plate, with the Central Range of Taiwan. During the first stage, strength of the margin induced a decrease of the convergence rate that controlled the final Central Range orientation and induced the second stage of the collision. A reconstruction of the Taiwan collision during the last 4 Ma is proposed. CFR, CEA, CNRS, Ave. de la terrasse, 91 190 Gif sur Yvette, France.

85:7144 Bukovics, Christian and P.A. Ziegler, 1985. Tectonic

development of the Mid-Norway continental margin. Mar. Petrol. Geol., 2(1):2-22.

Seismic reflection records, exploration well and shallow core-hole data are integrated to prepare a summary of the structural framework of the shelf and slope and the geologic evolution of the Mid- Norway Basin between 62 ° and 68°N. Devonian and Early Carboniferous wrench movements pre- ceded some 270 My of rifting prior to Early Eocene crustal separation between Greenland and Fennos- candia. Tensional forces appear to have dominated throughout this period; volcanic activity throughout the Late Paleozoic and Mesozoic remained low level. NAM b.v., Assen, Netherlands. (hbf)

85:7145 Craddock, C., E.C. Hauser, H.D. Maher, A.Y. Sun

and Guo-Qiang Zhu, 1985. Tectonic evolution of the west Spitsbergen fold belt. Tectonophysics, 114(1-4): 193-211. Dept. of Geol. and Geophys., Univ. of Wisconsin, Madison, WI 53706, USA.

85:7146 Gonzalez-Ferr~in, O., 1985. Volcanic and tectonic

evolution of the northern Antarctic Peninsula-- Late Cenozoic to Recent. Tectonophysics, 114(1- 4):389-409.

Geological, geophysical and geochemical analyses are used to study the tectonic history of the Antarctic Peninsula and adjacent islands. A two- stage history is suggested. Active subduction, indi- cated by a significant volcanic calc-alkaline belt along the northwestern margin of the peninsula, dominated from the Cretaceous to the Upper Miocene. Four cycles of volcanic activity can be

discerned. This phase was followed by a back-arc extension cycle that continues to the present, creating a 'fan-rift' system that includes the Brans- field, Prince Gustav and Larsen rifts. Petrological differences among the rifts are discussed. Dept. de Geol. y Geofis., Univ. de Chile, Santiago, Chile. (amt)

85:7147 He, Liansheng, 1984. Polycyclic plate tectonic move-

ments and the Cenozoic tectonics of the Sooth China Sea. Bull. Chin. Acad. geol. Sci., 9:65-74. (In Chinese, English abstract.)

Three plate tectonic cycles during the Late Creta- ceous-Eocene, Oligocene-Miocene, and Pliocene Pleistocene resulted in the formation of the Phil- ippines and Borneo (orogenic activity) and in the formation of the Celebes, Sulu, and South China seas as well as continental fragments of West Zhongsha and Nansha (seafloor spreading activity). Six tectonic stages: rifting, seafloor spreading, plate drifting, convergence, subduction and collision are defined as sea-making (the first three) or orogenic (the last three) movements. South China Sea Geol. Invest. Hdqtrs., Min. of Geol. and Min. Res., People's Republic of China. (msg)

85:7148 Herzer, R.H., J.D. Bradshaw (comment), R.M.

Carter and L. Carter (reply), 1985. IComment and reply] 'the Motunau fault and other structures at the southern edge of the Australian-Pacific plate boundary, offshore Marlborough, New Zea- land.' Tectonophysics, 115(1-2): 161-166.

Based on an analysis of multichannel reflection lines, the authors question the existence of a major fault-- the Motunau Faul t - - that was proposed by Carter and Carter (1982) to form a boundary of the Conway Microplate. They suggest that the region represents a 'zone of widespread dextral shear manifested in many ways and on many scales and not as a single transcurrent fault.' New Zealand Geol. Surv., Lower Hutt, New Zealand. (amt)

85:7149 Jackson, H.R., 1985. Nares Strait--a suture zone:

geophysical and geological implications. Tecton- ophysics, 114(1-4): 11-28.

Plate kinematics around the North Atlantic, the Norwegian and Greenland Seas and the Eurasian Basin constrain motion along Nares Strait. The triple junctions are found to be stable. Motion along Nares Strait between anomalies 34 and 13 is a combination of strike-slip and compression. Regional geology supports the plate reconstructions; local Nares Strait