OLR (1985) 32 (9) D. Submarine Geology and Geophysics 751

85:5118 Palacios-Fest, M.R., Rafd Gto-Arg~iez and P.R.

Krutak, 1983. The recent ostracods (Crnstacea) of Mexican Carib4bean and their fannistie sigulf- icance. An. Inst. Cienc. Mar Limnoi., Univ. nac. aut6n. M~x., 10(1):195-208. (In Spanish, English abstract.) Inst. Mexicano del Petro. Av. Lazaro Cardenas No. 152, Mexico, D.F. 07730, Mexico.

D200. Gravity, geodesy, magnetism 85:5119

Blaha, Georges, 1985. Relationship between the pressure and geopotential gradients in the ocean derived in tensor notations. Mar. Geod., 9(1):1% 25. Nova Univ. Oceanogr. Center, Dania, FL, USA.

85:5120 Chan, L.S., C.L. Chu and T.L. Ku, 1985. Magnetic

stratigraphy observed in ferromanganese crust. Geophys. Jl R. astr. Soc, 80(3):715-723.

Alternating field and thermal demagnetization and isothermal remanent magnetization analyses were performed on each of two sets of 1 mm slices of ferromanganese crust deposit. Results reveal the presence of a stable magnetism and both normal and reversed polarity intervals; however, the polarity intervals cannot be confidently correlated with the geomagnetic polarity time-scale of the last 10 Myr due to the polarity overlap inherent in the sampling technique. Results confirm the slow accretion rate of ferromanganese deposits and suggest their potential use in palaeomagnetic and tectonic studies. Dept. of Geol., Univ. of Wisconsin, Eau Claire, WI 54701, USA.

85:5121 Fukushima, Naoshi (guest editor), 1984. MAGSAT

investigations in Japan. Special issue. J. Geomagn. Geoelect., 36(10):387-527; 13 papers.

The objectives of NASA's MAGSAT project were to: (1) provide a quantitative description of the Earth's magnetic field, (2) update and refine world and regional magnetic charts, (3) provide a global scalar and vector crustal magnetic anomaly map, and (4) interpret the map together with correlative data for the purpose of assessing natural resources and planning future explorations. The project's data were given to a national research team in Japan and these 13 reports comprise the results (studies of geomagnetic fields and magnetic anomalies in and around the Japanese Islands), plus related topics such as ground and airborne magnetic survey data.

A summary of the team's research activities and an extract from their final report are also included. Ch., Japanese MAGSAT Team, Geophys. Res. Lab., Univ. of Tokyo, Japan. (Ut)

85:5122 Hall, J.M., 1985. The Iceland Research Drilling

Project crustal section: variation of magnetic properties with depth in Icelandic--type oceanic crust. Can. J. Earth Sci., 22(1):85-101.

Depth trends in the continuous vertical section extending from 0.6 to 3.6 km beneath the original surface include: a general increase in saturation and induced magnetization above 2-kin crustal depth, thought to result from a decrease in low-temperature oxidation and associated hydrothermal alteration; a decrease in flow magnetization below 2 km, attrib- uted to the alteration of magnetite to nonmagnetic phases; and large changes in flow magnetization on a scale of a few hundred meters below 3-kin crustal depth. The study demonstrates the importance of secondary magnetite in the flows in the lower portion of the section and suggests that magneti- zation values measured for near surface typical ocean crust represent minimal values, except in the case of very young or rapidly sealed crust. Centre for Mar. Geol., Dalhousie Univ., Halifax, NS B3H 3J5, Canada. (hbf)

85:5123 Rodionov, A.A. and E.I. Gordiyenok, 1983. Theory

of serf-reversal of the magnetization of ferro- magnetics. Phys. solid Earth (a translation of Fiz. Zemli), 19(10):823-825. Kursk Polytech. Inst., Kemerovo State Univ., USSR.

85:5124 Seeber, Gt~nter, 1985. Report on international sym-

pes im 'Point Positioning in Marine Geodesy,' Maraculbo, Venezuela. Mar. Geod., 9(1): 127-130. Pres. IAG Special Study Gr. 1.52, Univ. of Hannover, FRG.

85:5125 Smith, G.M., 1985. Source of marine magnetic

anomalies: some results from DSDP Leg 83. Geology, geol. Soc. Am., 13(3):162-165.

Drilling to a depth of 1075.5 m subbasement penetrated 300 m into a sheeted-dyke complex which showed sufficient magnetization to contribute to magnetic anomalies. The extrusive layer above it had been altered by hydrothermal circulation and lacked sufficient magnetization. Both observations must be considered in future models of magnetization of the marine crust. Dept. of Geol. and Geophys., Univ. of Minnesota, Minneapolis, MN 55455, USA. (mwf)