Custom Integrated Circuits

Contains reports on nine research projects.Analog Devices, Inc.International Business Machines CorporationJoint Services Electronics Program Contract DAAL03-89-C-0001U.S. Air Force - Office of Scientific Research Contract AFOSR 86-0164BDuPont CorporationNational Science Foundation Grant MIP 88-14612U.S. Navy - Office of Naval Research Contract N00014-87-K-0825American Telephone and TelegraphDigital Equipment CorporationNational Science Foundation Grant MIP 88-5876

Custom Integrated Circuits

Contains reports on twelve research projects.Analog Devices, Inc.International Business Machines, Inc.Joint Services Electronics Program (Contract DAAL03-86-K-0002)Joint Services Electronics Program (Contract DAAL03-89-C-0001)U.S. Air Force - Office of Scientific Research (Grant AFOSR 86-0164)Rockwell International CorporationOKI Semiconductor, Inc.U.S. Navy - Office of Naval Research (Contract N00014-81-K-0742)Charles Stark Draper LaboratoryNational Science Foundation (Grant MIP 84-07285)National Science Foundation (Grant MIP 87-14969)Battelle LaboratoriesNational Science Foundation (Grant MIP 88-14612)DuPont CorporationDefense Advanced Research Projects Agency/U.S. Navy - Office of Naval Research (Contract N00014-87-K-0825)American Telephone and TelegraphDigital Equipment CorporationNational Science Foundation (Grant MIP-88-58764

The Neuquén group: The reconstruction of a Late Cretaceous foreland basin in the southern Central Andes (35–37°S)

In the southern Central Andes of Argentina, between 34° and 41°S, the Neuquén Group records Upper Cretaceous nonmarine deposits that provide direct evidence of synorogenic sedimentation associated with the development of an early foreland basin. The configuration of this basin and its relation to the Malargüe fold and thrust belt are analyzed in this article using sedimentological analyses, U-Pb dating of detrital zircons and seismic and surface structural data. The remnant wedge-top depozone preserved in the Argentinian Andean slope exposes sedimentological information that indicates that braided fluvial systems, which may have formed part of broader fluvial fans, transported and deposited the sediments from an extensive relief area located in the present western Andean slope to the Chilean Coastal Range zones. The eastern border of this depositional system was defined by a basement uplift, interpreted either as a forebulge or an incipient broken foreland system, from where gravel-sandy braided river systems fed the foredeep depozone transporting and depositing sediments from the exposed cratonic area in the east. Consequently, an initial underfilled foreland basin was configured. The evolution of this early basin and the areas of sediment supply were controlled by the eastern expansion of the Malargüe fold and thrust belt, through the development of thick-skinned anticlines, which progressively fragmented the wedge-top zone. The evidence collected suggests that the Late Cretaceous uplift was a major tectonic event that exposed the entire Mesozoic column of the Neuquén basin up to the Permian-Triassic basement, which implies more than 2,500 m of denudation at that time. U-Pb determinations yielded a maximum depositional age of ca. 91 ± 2 Ma (Late Turonian), which suggests either non-deposition or cannibalization of a sedimentary interval of ca. 10 My at 36°S, when compared to the age of the basal sections of the Neuquén Group at other latitudes.Fil: Borghi, Pablo. Wintershall Dea; ArgentinaFil: Fennell, Lucas Martín. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Estudios Andinos "Don Pablo Groeber". Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Estudios Andinos "Don Pablo Groeber"; ArgentinaFil: Omil, Ricardo Gómez. Wintershall Dea; ArgentinaFil: Naipauer, Maximiliano. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Geocronología y Geología Isotópica. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Geocronología y Geología Isotópica; ArgentinaFil: Acevedo, Eliana Belén. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Estudios Andinos "Don Pablo Groeber". Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Estudios Andinos "Don Pablo Groeber"; ArgentinaFil: Folguera Telichevsky, Andres. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Estudios Andinos "Don Pablo Groeber". Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Estudios Andinos "Don Pablo Groeber"; Argentin

Late Oligocene–early Miocene submarine volcanism and deep-marine sedimentation in an extensional basin of southern Chile: Implications for the tectonic development of the North Patagonian Andes

The Chilean margin has been used as the model of an ocean-continent convergent system dominated by compression and active mountain building as a consequence of the strong mechanical coupling between the upper and the lower plates. The Andean Cordillera, however, shows evidence of alternating phases of compressional and extensional deformation. Volcano-sedimentary marine strata in the Aysén region of southern Chile contribute to an understanding of the causes of extensional tectonics and crustal thinning that occurred in the Andean orogeny because these deposits constitute the only reliable record of submarine suprasubduction volcanism during the Cenozoic in southern South America. In order to discern the age and tectono-sedimentary setting of these strata, referred to as the Traiguén Formation, we integrated sedimentology, ichnology, petrography, geochemistry, structural geology, foraminiferal micropaleontology, and U-Pb geochronology. Our results indicate that the Traiguén Formation was deposited in a deep-marine extensional basin during the late Oligocene–earliest Miocene. The geochemistry and petrography of the pillow basalts suggest that they formed in a convergent margin on a thinned crust rather than at an oceanic spreading center. We atribute the origin of the Traiguén Basin to a transient period of slab rollback and vigorous asthenospheric wedge circulation that was caused by an increase in trench-normal convergence rate at ca. 26–28 Ma and that resulted in a regional event of extension and widespread volcanism.Fil: Encinas, Alfonso. Universidad de Concepción; ChileFil: Folguera Telichevsky, Andres. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Estudios Andinos "Don Pablo Groeber". Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Estudios Andinos "Don Pablo Groeber"; ArgentinaFil: Oliveros, Veronica. Universidad de Concepción; ChileFil: De Girolamo Del Mauro, Lizet. Universidad de Concepción; ChileFil: Tapia, Francisca. Universidad de Concepción; ChileFil: Riffo, Ricardo. Universidad de Concepción; ChileFil: Hervé, Francisco. Universidad de Chile; Chile. Universidad Andres Bello; ChileFil: Finger, Kenneth L.. University of California Berkeley; Estados UnidosFil: Valencia, Victor A.. Washington State University; Estados UnidosFil: Gianni, Guido Martin. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Estudios Andinos "Don Pablo Groeber". Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Estudios Andinos "Don Pablo Groeber"; ArgentinaFil: Alvarez Pontoriero, Orlando. Universidad Nacional de San Juan. Facultad de Ciencias Exactas, Físicas y Naturales. Instituto Geofísico Sismológico Volponi; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentin

Custom Integrated Circuits

Contains table of contents for Part III, table of contents for Section 1 and reports on ten research projects.Analog Devices, Inc.IBM CorporationNational Science Foundation Grant MIP 91-17724U.S. Navy - Office of Naval Research Grant N00014-91-J-1698National Science Foundation Fellowship MIP 88-58764U.S. Navy Contract N00174-92-Q-0133Federal Bureau of Investigation Contract J-FBI-92-196National Defense Science and Engineering Graduate FellowshipDigital Equipment CorporationDefense Advanced Research Projects Agency/U.S. Navy - Office of Naval Research Contract N0014-91-J-1698IBM Corporation Grant/Fellowshi

Custom Integrated Circuits

Contains table of contents for Part III, table of contents for Section 1 and reports on nine research projects.Analog DevicesIBM CorporationNational Science Foundation/Defense Advanced Research Projects Agency Grant MIP 88-14612U.S. Navy - Office of Naval Research Grant N00014-91-J-1698National Science Foundation PYI MIP 88-58764U.S. Navy - Office of Naval Research Contract N00014-87-K-0825Digital Equipment CorporationFederal Bureau of InvestigationIBM Corporation Grant/Fellowshi