INVESTIGADOR RESPONSABLE

LE ROUX , JACOBUS PHILIPPUS

TESISTA(S) ASOCIADO(S) AL PROYECTO

ACHURRA REVECO, LUCIANO ENRIQUE ENCINAS MARTIN, ALFONSO HENRIQUEZ SALAZA, ALVARO ANDRES OLIVARES ALCAYAGA, DANISA MAGDALENA

INSTITUCION PRINCIPAL

UNIVERSIDAD DE CHILE (UCH) FACULTAD DE CIENCIAS FISICAS Y MATEMATICAS DEPARTAMENTO DE GEOLOGIA

REGIÓN

METROPOLITANA

DISCIPLINA PRINCIPAL

GEOLOGíA Y MINERALOGíA/ CIENCIAS DE LA TIERRA/ CIENCIAS EXACTAS Y NATURALES

SECTOR DE APLICACIÓN

CORTEZA TERRESTRE, MANTO TERRESTRE

RESUMEN DEL PROYECTO

Relative sea-level changes are related to eustatic events such as the expansion of ice caps in polar regions, as well as to local tectonic and isostatic processes. A thorough understanding of the interaction of these processes in any particular region can have many scientific and economic ramifications. For example, sea-level changes play an important role in sequence stratigraphy, which has developed into one of the major tools in petroleum exploration over the last few decades. In Chile, there have been relatively few attempts to disentangle the effects of the Andean tectonism from global sea-level oscillations, so that much uncertainty exists in this regard. This project proposes to study relative sea-level changes along the Chilean coastline during the Neogene and Quaternary, with two specific aims in mind: In the first place, the Chilean coastal region is considered to have a high potential for hosting paleoplacer gold deposits. There are many primary and secondary gold occurrences in the hinterland, which upon erosion would have released gold into the paleodrainage system. It is to be expected that considerable reworking of this gold would have taken place along the paleocoastline, conceivably leading to the formation of enriched placer deposits. In particular, paleobeaches and ravinement surfaces related to marine transgression are considered to be highly favourable environments. The project thus aims to eventually identify the coastal region with the highest potential to host gold paleoplacers, taking into account the availability of suitable gold sources in the interior as well as the presence of favourable facies and erosional surfaces in the coastal successions. Initially, the geology of Neogene and immediately overlying Quaternary deposits of six areas will be studied, namely at Antofagasta, Copiapo, Carizalillo, La Serena, Navidad and Arauco. In each of these areas, mapping of favourable facies and erosional surfaces will be followed up by detailed stratigraphic, sedimentological and paleontological studies to determine the subenvironments of deposition, ages of the deposits and the sequence of events. This should allow sea-level curves corresponding to this period to be drawn up for the entire northern to south-central coastline of Chile. Samples for gold analysis will be taken of favourable facies and deposits directly overlying ravinement surfaces. Finally, the most promising target area will be selected for detailed studies on gold mineralization. If significant concentrations of gold are encountered, an exploration model will be formulated to assist interested mining companies. The second aim of this project, which is to be undertaken in cooperation with the Institut de Recherche pour le Développment (IRD) in France, is to investigate the relationship between the rate of Andean uplift and erosion along the length of the mountain chain. Although the subduction rate of the Nazca Plate is relatively homogeneous from north to south, the morphology of the Andes shows an abrupt change in elevation in the same direction. North of 35ºS the mountain peaks regularly exceed 6000 m, whereas they seldom reach 3000 m between Concepción and Taitao. Tectonically, the accepted model for the north of Chile considers crustal thickening due to underplating to be the driving force of mountain-building, whereas the south is more complex. Here, crustal shortening is less significant, with normal and shear faults being characteristic of an inhomogeneous stress field. However, it is not certain whether the style of tectonism plays a greater role in the observed geomorphological change than the actual climate. The south of Chile receives much more rain and therefore should exhibit a much higher rate of erosion. The relationship between these factors therefore should be investigated to determine their relative importance. The proposed study (which will be carried out by the French researchers) will attempt to quantify the rate of uplift of the Andes and erosion in three different sectors (northern, central and southern Chile), as well as determining the force and deformation fields in order to model the effects of surficial and mountain-building processes. The present study (this project) is expected to cast more light on the rates of erosion and uplift in the hinterland over the last 23 Ma by relating these processes to their effect on sea-level changes and the rate of sedimentation along the coast.

PUBLICACIONES DEL PROYECTO

La finalidad principal de la base de datos de publicaciones FONDECYT es registrar la productividad científica informada por los investigadores de los proyectos financiados por este Fondo. Considerando la importancia que esta información tiene para la comunidad científica y publico en general, CONICYT la hace pública en su sitio web. Sin embargo, es necesario aclarar que no es una base de datos bibliográfica. Los autores informados en cada publicación, ordenados alfabéticamente, son aquellos que participaron directa o indirectamente en el proyecto y no responden necesariamente al orden de los autores del paper original.

ARTICULOS:

LE ROUX, JACOBUS PHILIPPUS; NIELSEN, SVEN; KEMNITZ, HELGA; HENRIQUEZ SALAZA, ALVARO ANDRES. A PLIOCENE MEGA-TSUNAMI DEPOSIT AND ASSOCIATED FEATURES IN THE RANQUIL FORMATION, SOUTHERN CHILE. SEDIMENTARY GEOLOGY, VOL.203:164-180, 2008.   FENNER, JULIANE; ISHMAN, SCOTT; LE ROUX, JACOBUS PHILIPPUS; MIDDLETON, HEATHER; NIELSEN, SVEN; OLIVARES ALCAYAGA, DANISA MAGDALENA; SMITH, NORMAN D. BAY SEDIMENTATION AS CONTROLLED BY REGIONAL CRUSTAL BEHAVIOUR, LOCAL TECTONICS AND EUSTATIC SEA-LEVEL CHANGES: COQUIMBO FORMATION (MIOCENE-PLIOCENE), BAY OF TONGOY, CENTRAL CHILE. SEDIMENTARY GEOLOGY, VOL.184:133-153, 2006.   LAVENU, ALAIN; ENCINAS MARTIN, ALFONSO. BRITTLE DEFORMATION OF THE NEOGENE DEPOSITS OF THE NAVIDAD BASIN (COASTAL CORDILLERA, 342 DEGREES S, CENTRAL CHILE). REVISTA GEOLOGICA DE CHILE, VOL.32 (2):229-248, 2005.   LE ROUX, JACOBUS PHILIPPUS; NIELSEN, SVEN; HENRIQUEZ SALAZA, ALVARO ANDRES. DEPOSITIONAL ENVIRONMENT OF STELLOGLYPHUS LLICOENSIS ISP. NOV.: A NEW RADIAL TRACE FOSSIL FOM THE NEOGENE RANQUIL FORMATION, SOUTH-CENTRAL CHILE. REVISTA GEOLOGICA DE CHILE, VOL.35 (2):1-13, 2008.   GOMEZ VEROIZA, CAROLINA ANDREA; LE ROUX, JACOBUS PHILIPPUS; OLIVARES ALCAYAGA, DANISA MAGDALENA. DETERMINING THE NEOGENE BEHAVIOR OF THE NAZCA PLATE BY GEOHISTORY ANALYSIS. GEOLOGY, VOL.33 (3):165-168, 2005.   ENCINAS MARTIN, ALFONSO; SUAREZ, MARIO E. EARLY MIOCENE ELASMOBRANCH FAUNA FROM THE NAVIDAD FORMATION, CENTRAL CHILE, SOUTH AMERICA. CAINOZOIC RESEARCH, VOL.4 2004.   ENCINAS MARTIN, ALFONSO; VILLA MARTINEZ, RODRIGO PATRICIO; FINGER, KENNETH L; HERVE ALLAMAND, FRANCISCO ENRIQUE ISIDORO; NIELSEN, SVEN; PETERSON, DAWN. FINDING OF A HOLOCENE MARINE LAYER IN ALGARROBO (33°22S), CENTRAL CHILE. IMPLICATIONS FOR COASTAL UPLIFT. REVISTA GEOLOGICA DE CHILE, VOL.33 (2):339-345, 2006.   LE ROUX, JACOBUS PHILIPPUS; VARGAS, G. HYDRAULIC BEHAVIOR OF TSUNAMI BACKFLOWS: INSIGHTS FROM THEIR MODERN AND ANCIENT DEPOSITS. ENVIRONMENTAL GEOLOGY, VOL.49 (1):65-75, 2005.   BUCHBINDER, BINYAMIN; FENNER, JULIANE; FINGER, KENNETH L; FRASSINETTI CABEZAS, DANIEL ANGEL; GOMEZ VEROIZA, CAROLINA ANDREA; GREGORY WODZIKI, KATHRYN M; LAVENU, ALAIN; LE ROUX, JACOBUS PHILIPPUS; MARCHANT, M; MARQUARDT ROMAN, CARLOS JORGE; MIDDLETON, HEATHER; VENEGAS, C. NEOGENE-QUATERNARY COASTAL AND OFFSHORE SEDIMENTATION IN NORTH CENTRAL CHILE: RECORD OF SEA-LEVEL CHANGES AND IMPLICATIONS FOR ANDEAN TECTONISM. JOURNAL OF SOUTH AMERICAN EARTH SCIENCES, VOL.19 (1):83-98, 2005.   ENCINAS MARTIN, ALFONSO; FELDMANN, RODNEY M; SCHWEITZER, CARRIE E; SUAREZ, MARIO E. NEW CRETACEOUS AND EOCENE CALLINASSOIDEA (THALASSINIDEA, DECAPODA) FROM ALGARROBO, CHILE. JOURNAL OF CRUSTACEAN BIOLOGY, VOL.26 (1):73-81, 2006.   ENCINAS MARTIN, ALFONSO; FELDMANN, RODNEY M; SCHWEITZER, CARRIE E. NEW DECAPODS FROM THE NAVIDAD FORMATION (MIOCENE) OF CHILE. JOURNAL OF CRUSTACEAN BIOLOGY, VOL.25 (3):427-449, 2005.   ENCINAS MARTIN, ALFONSO; BUATOIS, LUIS A; FINGER, KENNETH L; LE ROUX, JACOBUS PHILIPPUS; NIELSEN, SVEN; FOURTANIER, ELIZABETH; LAVENU, ALAIN. NEW STRATIGRAFIC SCHEME FOR THE MIO-PLIOCENE MARINE DEPOSITS OF THE NAVIDAD AREA (33 DEGREES 00 -34 DEGREES 30 S), CENTRAL CHILE. REVISTA GEOLOGICA DE CHILE, VOL.33 (2):221-246, 2006.   ENCINAS MARTIN, ALFONSO; MAKSAEV JURCHUC, VICTOR; PINTO, LUISA; LE ROUX, JACOBUS PHILIPPUS; MUNIZAGA VILLAVICENCIO, FRANCISCO JAVIER; ZENTILLI VAN KILSDONK, MARCOS. PLIOCENE LAHAR DEPOSITS IN THE COASTAL CORDILLERA OF CENTRAL CHILE: IMPLICATIONS FOR UPLIFT, AVALANCHE DEPOSITS, AND PORPHYRY COPPER SYSTEMS IN THE MAIN ANDEAN CORDILLERA. JOURNAL OF SOUTH AMERICAN EARTH SCIENCES, VOL.20:369-381, 2006.   ENCINAS MARTIN, ALFONSO; FINGER, KENNETH L; NIELSEN, SVEN; LAVENU, ALAIN; BUATOIS, LUIS A; PETERSON, DAWN; LE ROUX, JACOBUS PHILIPPUS. RAPID AND MAJOR COASTAL SUBSIDENCE DURING THE LATE MIOCENE IN SOUTH-CENTRAL CHILE. JOURNAL OF SOUTH AMERICAN EARTH SCIENCES, VOL.25 (2):157-175, 2008.   FENNER, JULIANE; GOMEZ VEROIZA, CAROLINA ANDREA; LE ROUX, JACOBUS PHILIPPUS; MIDDLETON, HEATHER. SEDIMENTOLOGICAL PROCESSES IN A SCARP-CONTROLLED ROCKY SHORELINE TO UPPER CONTINENTAL SLOPE ENVIRONMENT, AS REVEALED BY UNUSUAL SEDIMENTARY FEATURES IN THE NEOGENE COQUIMBO FORMATION, NORTH-CENTRAL CHILE. SEDIMENTARY GEOLOGY, VOL.165:67-92, 2004.   BUATOIS, LUIS A; ENCINAS MARTIN, ALFONSO. THE GLOSSIFUNGITES ICHNOFACIES AT THE BOUNDARY BETWEEN THE NAVIDAD (RAPEL MEMBER) AND LA CUEVA FORMATIONS, PLIOCENE OF THE COASTAL CORDILLERA, CHILE: ITS SEQUENCE STRATIGRAPHIC SIGNIFICANCE. AMEGHINIANA, VOL.43 (1):3-9, 2006.

INFORME:

LE ROUX, JACOBUS PHILIPPUS. TERTIARY AND QUATERNARY SEA-LEVEL CHANGES ALONG THE CHILEAN COAST:IMPLICATIONS WITH REGARD TO THE DEVELOPMENT OF BEACH GOLD PLACERS, ANDEAN TECTONISM AND EROSION. 2005. 14 p.

MANUSCRITOS:

BUCHBINDER, BINYAMIN; FENNER, JULIANE; GOMEZ VEROIZA, CAROLINA ANDREA; GREGORY WODZIKI, KATHRYN M; LAVENU, ALAIN; LE ROUX, JACOBUS PHILIPPUS; MIDDLETON, HEATHER; VENEGAS, C. MIOCENE-PLEISTOCENE COASTAL AND OFFSHORE SEDIMENTATION IN NORTH-CENTRAL CHILE: IMPLICATIONS FOR SEA LEVEL CHANGES AND ANDEAN TECTONISM. 25 p.

PONENCIAS:

BUCHBINDER, BINYAMIN; FENNER, JULIANE; GOMEZ VEROIZA, CAROLINA ANDREA; GREGORY WODZIKI, KATHRYN M; LE ROUX, JACOBUS PHILIPPUS; MIDDLETON, HEATHER. A MIOCENE SUBMARINE CANYON IN NORTH-CENTRAL CHILE: IMPLICATIONS FOR ANDEAN TECTONISM. En: 5º INTERNATIONAL SYMPOSIUM ON ANDEAN GEODYNAMICS (ISAG). TOULOUSE, FRANCIA. 20020916-20020918.   ENCINAS MARTIN, ALFONSO; FINGER, KENNETH L; LE ROUX, JACOBUS PHILIPPUS; NIELSEN, SVEN; PETERSON, DAWN; SUAREZ, MARIO E. AGE AND DEPOSITION OF THE LOWER NAVIDAD FORMATION IN CENTRAL CHILE. En: 3º LATIN AMERICAN CONGRESS OF SEDIMENTOLOGY. PARA, BRASIL. 20030608-20030611.   ENCINAS MARTIN, ALFONSO; FINGER, KENNETH L; LE ROUX, JACOBUS PHILIPPUS; NIELSEN, SVEN; PETERSON, DAWN; SUAREZ, MARIO E. EVOLUCION TECTONO-SEDIMENTARIA DE LA CUENCA NEOGENA DE NAVIDAD (33º40S-34º15S), CHILE CENTRAL. En: 10º CONGRESO GEOLOGICO CHILENO. CONCEPCION, CHILE. 20031006-20031010.   ENCINAS MARTIN, ALFONSO; SUAREZ, MARIO E. FAUNA FOSIL DE ELASMOBRANQUIOS DEL MIOCENO TEMPRANO DE LA FORMACION NAVIDAD, CHILE CENTRAL. CORRELACION CON LA FAUNA FOSIL ARGENTINA. En: 8º CONGRESO ARGENTINO DE PALEONTOLOGIA Y BIOESTRATIGRAFIA. ARGENTINA. 20021007-20021010.   BUATOIS, LUIS A; ENCINAS MARTIN, ALFONSO; FINGER, KENNETH L; LAVENU, ALAIN; NIELSEN, SVEN; PETERSON, DAWN. LATE MIOCENE COASTAL SUBSIDENCE IN CENTRAL CHILE. TECTONIC IMPLICATIONS. En: 6° INTERNATIONAL SYMPOSIUM ON ANDEAN GEODYNAMICS (ISAG). BARCELONA, ESPANA. 20050912-20050914.   ENCINAS MARTIN, ALFONSO; FINGER, KENNETH L; NIELSEN, SVEN; PETERSON, DAWN. MICROFAUNAL INDICATIONS OF LATE MIOCENE DEEP-WATER BASINS OFF THE CENTRAL COAST OF CHILE. En: 10º CONGRESO GEOLOGICO CHILENO. CONCEPCION, CHILE. 20031006-20031010.   ENCINAS MARTIN, ALFONSO. NAVIDAD FORMATION: DELTAYC SEDIMENTATION THAT REFLECTS THE TECTONIC CHANGE DURING THE LOWER MIOCENE IN SOUTH AMERICA. En: 5º INTERNATIONAL SYMPOSIUM ON ANDEAN GEODYNAMICS (ISAG). TOULOUSE, FRANCIA. 20020916-20020918.   ACHURRA REVECO, LUCIANO ENRIQUE; LACASSIE REYES, JUAN PABLO; LE ROUX, JACOBUS PHILIPPUS; MARQUARDT ROMAN, CARLOS JORGE. NODULOS DE MN DE LA FORMACION BAHIA INGLESA: GEOQUIMICA, GENESIS E IMPLICANCIAS PALEOAMBIENTALES. En: 10º CONGRESO GEOLOGICO CHILENO. CONCEPCION, CHILE. 20031006-20031010.   ENCINAS MARTIN, ALFONSO; FINGER, KENNETH L; NIELSEN, SVEN; PETERSON, DAWN. OSTRACODA FROM MIOCENE DEEP WATER DEPOSITS IN CENTRAL CHILE: PRELIMINARY RESULTS. En: 2003 ANNUAL MEETING OF THE GEOLOGICAL SOCIETY OF AMERICA. SEATTLE, ESTADOS UNIDOS DE AMERICA. 20031102-20031105.   ENCINAS MARTIN, ALFONSO. PRESENCIA DE VERTEBRADOS MARINOS NEOGENOS EN LA FORMACION LO ABARCA, CHILE CENTRAL. En: 1º CONGRESO LATINOAMERICANO DE PALEONTOLOGIA DE VERTEBRADOS. SANTIAGO, CHILE. 20021000-20021000.   ENCINAS MARTIN, ALFONSO; FINGER, KENNETH L; HERVE ALLAMAND, FRANCISCO ENRIQUE ISIDORO; PETERSON, DAWN; SVEN, N; VILLA MARTINEZ, RODRIGO PATRICIO. REGISTRO SEDIMENTOLOGICO DE LA TRANSGRESION MARINA DEL HOLOCENO MEDIO EN EL AREA DE ALGARROBO (33º22S), CHILE CENTRAL. IMPLICACIONES TECTONICAS Y PALEOECOLOGICAS. En: 10º CONGRESO GEOLOGICO CHILENO. CONCEPCION, CHILE. 20031006-20031010.   DEVRIES, T J; ENCINAS MARTIN, ALFONSO; FINGER, KENNETH L; NIELSEN, SVEN; PETERSON, DAWN. TOWARDS AN UNDERSTANDING OF THE AGE OF THE NAVIDAD FORMATION. En: 10º CONGRESO GEOLOGICO CHILENO. CONCEPCION, CHILE. 20031006-20031010.   ENCINAS MARTIN, ALFONSO; SUAREZ, MARIO E. VERTEBRADOS MARINOS DEL MIEMBRO INFERIOR DE LA FORMACION (MIOCENO TEMPRANO), CHILE CENTRAL. En: 1º CONGRESO LATINOAMERICANO DE PALEONTOLOGIA DE VERTEBRADOS. SANTIAGO, CHILE. 20021000-20021000.

TESIS:

ACHURRA REVECO, LUCIANO ENRIQUE. CAMBIOS DEL NIVEL DEL MAR Y EVOLUCION TECTONICA DE LA CUENCA NEOGENA DE CALDERA, III REGION. Tesis para optar al grado de MAGISTER EN CIENCIAS C/M GEOLOGIA. SANTIAGO, CHILE. UNIVERSIDAD DE CHILE (UCH), FACULTAD DE CIENCIAS FISICAS Y MATEMATICAS, ESCUELA DE POSTGRADO. 2004. Profesor Guia: LE ROUX, JACOBUS PHILIPPUS.   GOMEZ VEROIZA, CAROLINA ANDREA. CAMBIOS RELATIVOS DEL NIVEL DEL MAR, DURANTE EL CENOZOICO TARDIO, EN LA ZONA DE CARRIZALILLO, III REGION, CHILE. Tesis para optar al grado de MAGISTER EN CIENCIAS C/M GEOLOGIA. SANTIAGO, CHILE. UNIVERSIDAD DE CHILE (UCH), FACULTAD DE CIENCIAS FISICAS Y MATEMATICAS, ESCUELA DE POSTGRADO. 2003. Profesor Guia: LE ROUX, JACOBUS PHILIPPUS.   ENCINAS MARTIN, ALFONSO. CAMBIOS RELATIVOS EN EL NIVEL DEL MAR PRODUCIDOS DURANTE ELCENOZOICO EN LA CUENCA DE NAVIDAD (VI REGION, CHILE): IMPLICACIONES TECTONO-SEDIMENTARIAS, PALEOCLIMATICAS Y PALEOECOLOGICAS. . SANTIAGO, CHILE. UNIVERSIDAD DE CHILE (UCH), FACULTAD DE CIENCIAS FISICAS Y MATEMATICAS, DEPARTAMENTO DE GEOLOGIA. Profesor Guia: LE ROUX, JACOBUS PHILIPPUS.   OLIVARES ALCAYAGA, DANISA MAGDALENA. EVOLUCION MIOCENA-PLEISTOCENA DE LAS SUCECIONES SEDIMENTARIAS MARINAS DE BAHIA TONGOY IV REGION DE COQUIMBO. Tesis para optar al titulo de GEOLOGO. SANTIAGO, CHILE. UNIVERSIDAD DE CHILE (UCH), FACULTAD DE CIENCIAS FISICAS Y MATEMATICAS, DEPARTAMENTO DE GEOLOGIA. 2004. Profesor Guia: LE ROUX, JACOBUS PHILIPPUS.