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One possible mechanism for oceanization of continental crust
880
D. SubmarineGeologyand Geophysics
81,'6634 Rezanov, I.A. and I.A. Zotov, 1981. Oa¢ ~ l e
medmeism for ~
ot ~
crest.
OLR (1981)28 (12)
depth; major faults perhaps act as migratory conduits, Further exploration is encouraged. USGS, Menlo Park, Calif. 94025, USA. (dme)
DokL Akad. Nauk $SSR, 257(5):1200-1204. (In Russian.) 81:6635 Smithson, S.B., R.A. Johnson and Yun K. Wong, 1981. Mean [coathteatal] crustal velocity: a critical parameter for i n ~ crustal structure and crustal growth. Earth planet. Sci. Letts, 53(3):323-332. Mean velocities of 158 (mostly) refraction determinations range 5.8-7.0 krn/sec. Granodionte to felsic quartz diorite are compositions associated with the most common mean of 6.3 km/sec. These velocities suggest that addition of island arc material is not the sole method of creating continental crust. Dept. o f Geol., Univ. of Wyoming, Laramie, Wyo. 82071. USA. (bas) 81:6636 Talwani, Manik and Marcus Langseth, 1981. Ocean crustal ~ . Science, 213(4503):22-31. Salient problems concerned with passive and convergent margins and oceanic crust are summarized. Regardless of the economic resources present, interest in oceanic research will remain high as many questions are best studied at sea (e.g., continental shapes influenced by subduction processes, and determination of the plate driving mechanism). At present, the emphasis is on data syntheses and modelling rather than on reconnaissance exploration; future breakthroughs are expected with the development of new technologtes. Includes 126 references. Lamont-Doherty Geol. Observ., Palisades, N.Y. 10964, USA. (bas)
D 3 3 0 . Oil and gas 81:6637 Kvenvolden, K.A., T.M. Vogel and J.V. Gardner, t981. lathe
Sea,, 219. The presence of thermogenic hydrocarbons tn sediment samples from 0.5 m depth in gravity cores over an area of 30,060 km 2 was assessed using gas chromatography. /,Athough no major hydrocarbon anomalies were seen, two stations at the southern end of St. George Basin may have hydrocarbons at
D340. M a n g a n e s e nodules, etc. 81:6638 Roonwal, G.S. and G.H. Friedrich, 1981. Surface ch~acteristlcs and growth patterns in some nodules from the central Pacific. Indian J. mar. Sci., 10(!):57-60. SEM indicates nodules are made up of botryoids. When large botryoids are present as aggregates, nodule texture is rough; smaller botryoids give smooth texture. Petrographic study indicates nodule growth starts with penetration and accumulation of Mn-oxides around a nucleus (grains of Volcanic material, ancient nodules, fish teeth). With subsequent accumulation and diagenetic processes, dendrites and cusps develop. Dept. of Geol.. Univ. ot Delhi. Delhi 110 007. India. 81:6639 Savenko, V.S., 1981. Stability of the oxygen compounds of manganese in seawater and some
pmblems of the genesis of koa-maagaaese con¢retions. Dokl. Akad. Nauk SSSR, 257(5): 12171220. (In Russian.)
D360. Books, collections (general) 81:6640 Drake, C.L. and L.E. Schmitt (eds.), I981. Solid Earth. Science, 213(4503): 13-110: ] 3 papers. These papers are largely an outgrowth of the International Geodynamics Project, and perhaps anticipatory of the more detailed studies to come from the Inter-Union Lithosphere Program. The goal of these massive projects is, of course, a world-wide reexamination of the Earth's history and the dynamics which govern it. Topics include ocean crustal dynamics, mid-ocean ridge processes, ancient continental suture zones, continental accretion. lntraplate earthquakes, Earth's (and other planets') internal properties and processes, mantle evolution~ space technology applications to geodynamics, and the quantification of biological and chemical interactions with the lithosphere. (fcs) 81:6641 Suppe, John et al., 1979. [Taiwan geotogY.i Petrol. Geol. Taiwan, 16:226pp; 13 papers. (English with some Chinese.)
D. SubmarineGeologyand Geophysics
81,'6634 Rezanov, I.A. and I.A. Zotov, 1981. Oa¢ ~ l e
medmeism for ~
ot ~
crest.
OLR (1981)28 (12)
depth; major faults perhaps act as migratory conduits, Further exploration is encouraged. USGS, Menlo Park, Calif. 94025, USA. (dme)
DokL Akad. Nauk $SSR, 257(5):1200-1204. (In Russian.) 81:6635 Smithson, S.B., R.A. Johnson and Yun K. Wong, 1981. Mean [coathteatal] crustal velocity: a critical parameter for i n ~ crustal structure and crustal growth. Earth planet. Sci. Letts, 53(3):323-332. Mean velocities of 158 (mostly) refraction determinations range 5.8-7.0 krn/sec. Granodionte to felsic quartz diorite are compositions associated with the most common mean of 6.3 km/sec. These velocities suggest that addition of island arc material is not the sole method of creating continental crust. Dept. o f Geol., Univ. of Wyoming, Laramie, Wyo. 82071. USA. (bas) 81:6636 Talwani, Manik and Marcus Langseth, 1981. Ocean crustal ~ . Science, 213(4503):22-31. Salient problems concerned with passive and convergent margins and oceanic crust are summarized. Regardless of the economic resources present, interest in oceanic research will remain high as many questions are best studied at sea (e.g., continental shapes influenced by subduction processes, and determination of the plate driving mechanism). At present, the emphasis is on data syntheses and modelling rather than on reconnaissance exploration; future breakthroughs are expected with the development of new technologtes. Includes 126 references. Lamont-Doherty Geol. Observ., Palisades, N.Y. 10964, USA. (bas)
D 3 3 0 . Oil and gas 81:6637 Kvenvolden, K.A., T.M. Vogel and J.V. Gardner, t981. lathe
Sea,, 219. The presence of thermogenic hydrocarbons tn sediment samples from 0.5 m depth in gravity cores over an area of 30,060 km 2 was assessed using gas chromatography. /,Athough no major hydrocarbon anomalies were seen, two stations at the southern end of St. George Basin may have hydrocarbons at
D340. M a n g a n e s e nodules, etc. 81:6638 Roonwal, G.S. and G.H. Friedrich, 1981. Surface ch~acteristlcs and growth patterns in some nodules from the central Pacific. Indian J. mar. Sci., 10(!):57-60. SEM indicates nodules are made up of botryoids. When large botryoids are present as aggregates, nodule texture is rough; smaller botryoids give smooth texture. Petrographic study indicates nodule growth starts with penetration and accumulation of Mn-oxides around a nucleus (grains of Volcanic material, ancient nodules, fish teeth). With subsequent accumulation and diagenetic processes, dendrites and cusps develop. Dept. of Geol.. Univ. ot Delhi. Delhi 110 007. India. 81:6639 Savenko, V.S., 1981. Stability of the oxygen compounds of manganese in seawater and some
pmblems of the genesis of koa-maagaaese con¢retions. Dokl. Akad. Nauk SSSR, 257(5): 12171220. (In Russian.)
D360. Books, collections (general) 81:6640 Drake, C.L. and L.E. Schmitt (eds.), I981. Solid Earth. Science, 213(4503): 13-110: ] 3 papers. These papers are largely an outgrowth of the International Geodynamics Project, and perhaps anticipatory of the more detailed studies to come from the Inter-Union Lithosphere Program. The goal of these massive projects is, of course, a world-wide reexamination of the Earth's history and the dynamics which govern it. Topics include ocean crustal dynamics, mid-ocean ridge processes, ancient continental suture zones, continental accretion. lntraplate earthquakes, Earth's (and other planets') internal properties and processes, mantle evolution~ space technology applications to geodynamics, and the quantification of biological and chemical interactions with the lithosphere. (fcs) 81:6641 Suppe, John et al., 1979. [Taiwan geotogY.i Petrol. Geol. Taiwan, 16:226pp; 13 papers. (English with some Chinese.)