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Conditions of simultaneity and interaction between subduction and orogenesis
OLR(1979)26(12)
C. Submarine Geology and Geophysics
port paths around the British Isles resulting from M2 and M4 tidal interactions. J. mar. biol. Ass. U.K., 59(25: 497-513. Maximum bottom stress and mean stress on the shelf sea bed resulting from tidal streaming are estimated from a non-linear numerical model. Predicted vector distributions are in agreement with geological data on sand transport. The interaction of M 2 and M ( tides is therefore an important consideration in sand movement and other benthic processes. Figures include bottom stress charts. The Laboratory, Marine Biological Association, Citadel Hill, Plymouth, England. (rio)
12. Plate tectonics, global tectonics, etc. 79:6009 Barazangi, Muawia and B. L. Isacks, 1979. Subduction of the Nazca Plate beneath Peru: evidence from spatial distribution of earthquakes. Geophys. Jl R. astr. Soc., 57(3): 537-555. In a previous paper (Barazangi and lsacks, 19765 the subduction of the oceanic Nazca Plate beneath western South America was shown to fit a simple model for oceanic plates descending beneath island arcs. New data and a detailed re-examination of the spatial distribution of all reported earthquakes in this area strongly support the previous conclusions. The flat geometry of the descending Nazca Plate and an absence of Quaternary volcanism on the overriding plate are emphasized. Causes of the fiat geometry and its far-reaching implications are considered. Institute of Applied Geology, King Abdulaziz University, Jeddah, Saudi Arabia. (rio) 79:6010 Ricou, L.-E., 1979. Conditions d'une concomitance et d'une interaction orogenese-subduction. [Conditions of simultaneity and interaction between subduction and orogenesis.] C. r. hebd. Sdanc. Acad. Sci., Paris. (A)288(15): 1131-1138. Subduction and orogenesis are two ways of consuming the lithospheric excess in convergence zones, but they do not usually occur systematically at the same time. The tectonic regime around a subduction zone is shown to depend on compression and distension factors. Laboratoire de G6ologie historique, Universite de Paris-Sud, E.R.A. No. 9, Asie alpine occidentale, 91405, Orsay, France. 79:6011 Roblot, M.-M., 1978. Zone rhegmatique N 155 ° entre Ecosse et Mediterran~e. [Rhegmatic area N 155 ° from Scotland to the Mediterranean.] C. r. Etud. Socles Eur.. juin 1978:8 pp. Includes 1 geological map. Etudes des socles Europ~ens, College de France, Station Berthelot, 92190 Meudon, France.
781
79:6012 Sengor, A. M. C., 1979. Mid-Mesozoic closure of Permo-Triassic Tethys and its implications. Nature, Lond., 279(5714): 590-593. Data from the Alpine/Himalayan orogenic system tend to confirm Hsu's hypothesis that a Permian/Triassic Paleo-Tethys between Laurasia and Gondwanaland closed during the mid-Mesozoic along sutures located in the Tethyan Orogen. The closure was caused by the collision of a Cimmerian continental block (split from Gondwanaland) with Laurasia. The Neo-Tethys may have formed over a back-arc basin in the Paleo-Tethyan subduction zone, but Alpine 'overprinting' precludes any detailed reconstructions. Department of Geological Sciences, State University of New York at Albany, Albany, N.Y. 12222, U.S.A. (fcs) 79:6013 Von Herzen, R. P., 1979. Comments on 'Why do i not accept plate tectonics?' [Heat flow arguments.] Eos, 60(24): p. 490. Woods Hole Oceanographic Institution, Woods Hole, Mass., U.S.A. 79:6014 Withjack, Martha, 1979. A convective heat transfer model for lithospheric thinning and crustal uplift. J. geophys. Res., 84(B65: 3008-3022. Crustal thinning and uplift dimensions are numerically modelled as time functions after the onset of penetrative, forced convective transfer of heat into the lithosphere by magma intrusion from the mantle. The model produces uplift and deflection rates similar to those of Hawaii and certain continental rifts. Cities Service Oil Company, Exploration and Production Research, Box 50408, Tulsa, Okla. 74150, U.S.A.
(fcs5
13. Volcanism and magmatism; igneous rocks, minerals, etc. 79:6015 Batiza, Rodey, Kiyoto Futa and C. E. Hedge, 1979. Trace element and strontium isotope characteristics of volcanic rocks from isla Tortuga: a young seamount in the Gulf of California. Earth planet. Sci. Letts, 43(2): 269-278. Tortuga basalt lavas with high M g / F e and Ni contents have trace element abundances and ratios and Sr-87/Sr-86 values that are typical of certain midocean ridge tholeiites, but there are also significant differences. Anomalies in light rare earth elements, incompatible trace elements and strontium isotope variability are proposed to be the result of contamination during fractionation in a high-level crustal magma chamber. Department of Earth and Planetary Sciences and McDonnell Center for Space Sciences, Washington University, St. Louis, Mo. 63130, U.S.A. (rlo)
C. Submarine Geology and Geophysics
port paths around the British Isles resulting from M2 and M4 tidal interactions. J. mar. biol. Ass. U.K., 59(25: 497-513. Maximum bottom stress and mean stress on the shelf sea bed resulting from tidal streaming are estimated from a non-linear numerical model. Predicted vector distributions are in agreement with geological data on sand transport. The interaction of M 2 and M ( tides is therefore an important consideration in sand movement and other benthic processes. Figures include bottom stress charts. The Laboratory, Marine Biological Association, Citadel Hill, Plymouth, England. (rio)
12. Plate tectonics, global tectonics, etc. 79:6009 Barazangi, Muawia and B. L. Isacks, 1979. Subduction of the Nazca Plate beneath Peru: evidence from spatial distribution of earthquakes. Geophys. Jl R. astr. Soc., 57(3): 537-555. In a previous paper (Barazangi and lsacks, 19765 the subduction of the oceanic Nazca Plate beneath western South America was shown to fit a simple model for oceanic plates descending beneath island arcs. New data and a detailed re-examination of the spatial distribution of all reported earthquakes in this area strongly support the previous conclusions. The flat geometry of the descending Nazca Plate and an absence of Quaternary volcanism on the overriding plate are emphasized. Causes of the fiat geometry and its far-reaching implications are considered. Institute of Applied Geology, King Abdulaziz University, Jeddah, Saudi Arabia. (rio) 79:6010 Ricou, L.-E., 1979. Conditions d'une concomitance et d'une interaction orogenese-subduction. [Conditions of simultaneity and interaction between subduction and orogenesis.] C. r. hebd. Sdanc. Acad. Sci., Paris. (A)288(15): 1131-1138. Subduction and orogenesis are two ways of consuming the lithospheric excess in convergence zones, but they do not usually occur systematically at the same time. The tectonic regime around a subduction zone is shown to depend on compression and distension factors. Laboratoire de G6ologie historique, Universite de Paris-Sud, E.R.A. No. 9, Asie alpine occidentale, 91405, Orsay, France. 79:6011 Roblot, M.-M., 1978. Zone rhegmatique N 155 ° entre Ecosse et Mediterran~e. [Rhegmatic area N 155 ° from Scotland to the Mediterranean.] C. r. Etud. Socles Eur.. juin 1978:8 pp. Includes 1 geological map. Etudes des socles Europ~ens, College de France, Station Berthelot, 92190 Meudon, France.
781
79:6012 Sengor, A. M. C., 1979. Mid-Mesozoic closure of Permo-Triassic Tethys and its implications. Nature, Lond., 279(5714): 590-593. Data from the Alpine/Himalayan orogenic system tend to confirm Hsu's hypothesis that a Permian/Triassic Paleo-Tethys between Laurasia and Gondwanaland closed during the mid-Mesozoic along sutures located in the Tethyan Orogen. The closure was caused by the collision of a Cimmerian continental block (split from Gondwanaland) with Laurasia. The Neo-Tethys may have formed over a back-arc basin in the Paleo-Tethyan subduction zone, but Alpine 'overprinting' precludes any detailed reconstructions. Department of Geological Sciences, State University of New York at Albany, Albany, N.Y. 12222, U.S.A. (fcs) 79:6013 Von Herzen, R. P., 1979. Comments on 'Why do i not accept plate tectonics?' [Heat flow arguments.] Eos, 60(24): p. 490. Woods Hole Oceanographic Institution, Woods Hole, Mass., U.S.A. 79:6014 Withjack, Martha, 1979. A convective heat transfer model for lithospheric thinning and crustal uplift. J. geophys. Res., 84(B65: 3008-3022. Crustal thinning and uplift dimensions are numerically modelled as time functions after the onset of penetrative, forced convective transfer of heat into the lithosphere by magma intrusion from the mantle. The model produces uplift and deflection rates similar to those of Hawaii and certain continental rifts. Cities Service Oil Company, Exploration and Production Research, Box 50408, Tulsa, Okla. 74150, U.S.A.
(fcs5
13. Volcanism and magmatism; igneous rocks, minerals, etc. 79:6015 Batiza, Rodey, Kiyoto Futa and C. E. Hedge, 1979. Trace element and strontium isotope characteristics of volcanic rocks from isla Tortuga: a young seamount in the Gulf of California. Earth planet. Sci. Letts, 43(2): 269-278. Tortuga basalt lavas with high M g / F e and Ni contents have trace element abundances and ratios and Sr-87/Sr-86 values that are typical of certain midocean ridge tholeiites, but there are also significant differences. Anomalies in light rare earth elements, incompatible trace elements and strontium isotope variability are proposed to be the result of contamination during fractionation in a high-level crustal magma chamber. Department of Earth and Planetary Sciences and McDonnell Center for Space Sciences, Washington University, St. Louis, Mo. 63130, U.S.A. (rlo)