Episodic development of a convergent margin inferred from structures and processes along the southern Chile margin

Bangs, N. L.; Cande, S. C.

doi:10.1029/97tc00494

Cited by 180 publications

(209 citation statements)

References 40 publications

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“…Adjacent to the study area, the subducting Nazca Plate is ∼32 Ma old and the Perú-Chile trench is filled by 1.5-2.0 km of sediments (e.g. Bangs and Cande, 1997). Sediments have filled the trench since the onset of glaciation in the Patagonian Andes ca.…”

Section: Regional Tectonic and Geologic Settingmentioning

confidence: 99%

“…Sediments have filled the trench since the onset of glaciation in the Patagonian Andes ca. 6-5 Ma, leading to a change from erosive to accretionary conditions during the Pliocene, and resulting in the inversion of forearc basins (Bangs and Cande, 1997;Melnick and Echtler, 2006a).…”

Section: Regional Tectonic and Geologic Settingmentioning

confidence: 99%

“…Major fracture zones (F.Z.) of the subducting Nazca Plate are labeled and the limit of trench filling sediments is indicated (after Bangs and Cande, 1997;Tebbens and Cande, 1997). Major Quaternary faults of the South American Plate after a compilation of Melnick et al (2009).…”

Section: Regional Tectonic and Geologic Settingmentioning

confidence: 99%

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Forearc uplift rates deduced from sediment cores of two coastal lakes in south-central Chile

et al. 2010

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The present paper introduces a new approach for deriving information about local forearc tectonics and related uplift rates based on the study of lake sediments. We investigated two coastal lakes at the south-central Chile margin, lakes Lanalhue and Lleu Lleu, located south of the Arauco Peninsula (38°S). Both lakes developed within the valleys of ancient rivers that once drained to the Pacific Ocean, being subsequently dammed by rising sills in the late Pleistocene/early Holocene. Seismic profiling and sedimentological analyses of cores from both lakes revealed similar successions consisting of marine to brackish sediments covered by lacustrine deposits. Radiocarbon dating indicates that the marine-lacustrine transition occurred at 8 ka and 8.15 ka, respectively. The correlation of this transition with global sea-level curves allowed the calculation of local uplift rates for the Holocene. Uplift rates for the lake basins amount to 0.42 ± 0.71 and 0.49 ± 0.44 mm/a, respectively, which are consistent with rates determined from a late Pleistocene marine terrace in the area. However, conspicuously higher, though likely transient, vertical movements at 8.83 ± 2.7 mm/a and 11.36 ±1.77 mm/a, respectively, were calculated for the sills that block both lakes nowadays. These barriers are interpreted to be the surface expression of a blind reverse fault associated to the Morguilla fault system, a seismically-active structure that controls uplift and folding along the adjacent Arauco Peninsula.

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Section: Regional Tectonic and Geologic Settingmentioning

confidence: 99%

Section: Regional Tectonic and Geologic Settingmentioning

confidence: 99%

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Forearc uplift rates deduced from sediment cores of two coastal lakes in south-central Chile

et al. 2010

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“…The characteristic and widely distributed depositional pattern identified in slope basins fill as basal pre-kinematic, intermediate syn-kinematic, and upper postkinematic units, reveals tectonic cycles which may be linked to accretionary, nonaccretionary, or erosive episodes as suggested by Bangs and Cande (1997) for the development of the south Chile margin. However, the nature of the relationship between these tectonic episodes and the sedimentary pattern (pre-, post-, and synkinematic sequences), as well as mechanisms controlling the formation of accommodation spaces remains to be elucidated.…”

Section: Facultad De Ciencias De La Tierra Universidad Autónoma De Nmentioning

confidence: 99%

“…These modes have been associated with changing sediment supply due to climatic fluctuations 1,9,13 . Bangs and Cande (1997) have associated the recent accretive stage to the initiation of Pleistocene glacial erosion in the Main Cordillera.…”

Section: Facultad De Ciencias De La Tierra Universidad Autónoma De Nmentioning

confidence: 99%

International Lateinamerika-Kolloquium 2009

Möller-McNett¹

2009

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Remarkably consistent thermal state of the south central Chile subduction zone from 36°S to 45°S

Rotman

Spinelli

2014

JGR Solid Earth

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Delineating rupture areas of subduction zone earthquakes is necessary for understanding the controls on seismic and aseismic slip. For the largest recorded earthquake, the 1960 Chile event with moment magnitude 9.5, the rupture area is only loosely defined due to limitations in the global seismic network at the time. The rupture extends~900 km along strike. Coastal deformation is consistent with either a constant rupture width of~180-200 km along the entire length or a narrower (~115 km) rupture in the southern half. A southward narrowing of the seismogenic zone has been hypothesized to result from warming of the subduction zone to the south, where the subducting plate is younger. We present results of thermal models at 36°S, 38°S, 43°S, and 45°S to examine potential along-strike changes in thermal state. Models most consistent with observed surface heat flux include fluid circulation in the oceanic crust that advects heat to the ocean. This ventilated hydrothermal circulation preferentially cools transects with young subducting lithosphere; frictional heating preferentially warms transects with older subducting lithosphere. The combined effects of frictional heating and hydrothermal circulation increase décollement temperatures in the 36°S and 38°S transects by up to~155°C and decrease temperatures in the 45°S transect by up to~150°C. In our preferred models, décollement temperatures 200 km landward of the trench in all four transects arẽ 350-400°C. This is consistent with a constant~200 km wide seismogenic zone for the 1960 M w 9.5 rupture, with decreasing slip magnitude in the southern half of the rupture.

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Episodic development of a convergent margin inferred from structures and processes along the southern Chile margin

Abstract: in an episodic development of the margin and produced a discontinuous record of convergence history within the accretionary wedge.

Cited by 180 publications

References 40 publications

Forearc uplift rates deduced from sediment cores of two coastal lakes in south-central Chile

Forearc uplift rates deduced from sediment cores of two coastal lakes in south-central Chile

International Lateinamerika-Kolloquium 2009

Remarkably consistent thermal state of the south central Chile subduction zone from 36°S to 45°S

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