Late Cenozoic transpressional ductile deformation north of the Nazca–South America–Antarctica triple junction

Cembrano, José; Lavenu, Alain; Reynolds, P. H.; Arancibia, Gloria; López, Gloria I.; Sanhueza, Alejandro

doi:10.1016/s0040-1951(02)00388-8

Cited by 134 publications

(199 citation statements)

References 53 publications

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“…Furthermore, large-scale East-West to ENE-WSW striking lineaments bridging across the LOFZ to the eastern side of the Andean Range suggest restraining stepovers (e.g., Rosenau et al, 2006). Similar differential block exhumation patterns were derived in the southern part of the NPB from kinematic analyses by Cembrano et al (2002) and FT thermochronology by Thomson (2002). A major uplifted central block is located between two major segments of the LOFZ that diverge northwards from Golfo de Penas to Canal Costa and Puyuhuapi (~44º-46ºS, 73ºW; Fig.1).…”

Section: Zircon and Apatite Fi Ssion-track Cooling Historiesmentioning

confidence: 57%

“…According to Ar/Ar dating by Cembrano et al (2000Cembrano et al ( , 2002, many of these were formed in Late Miocene to Pliocene times.…”

Section: Geological Settingmentioning

confidence: 99%

“…As an apparent effect of the oblique ridge subduction, the structural styles differ to the north (pre-ridge collision) and south (post-ridge collision) of Taitao Peninsula, where the CTJ is located at present (Dewey and Lamb, 1992;Diriason et al 1998;Lavenu and Cembrano, 1999). To the north of the CTJ, the most obvious structure is the long-lived intra-arc Liquiñe-Ofqui fault zone (LOFZ, Hervé, 1976;Cembrano et al, 1996Cembrano et al, , 2000, which has accommodated an arc-parallel component of plate motion and controlled the emplacement of intrusions of the NPB (Hervé et al, 1993Pankhurst et al, 1992Pankhurst et al, , 1999Cembrano et al, 2002). Shaded relief digital elevation modeling (Rosenau et al, 2006), regional and structural fi eld mapping (Thiele et al, 1986;SERNAGEOMIN-BRGM, 1995 1 ;Diriason et al, 1998;Arancibia et al, 1999;Lavenu and Cembrano, 1999), microstructural analyses (Cembrano et al, 1996(Cembrano et al, , 2002Arancibia et al, 1999), and Ar/Ar laser-total fusion and step-heating geochronology of synkinematic minerals (Cembrano et al, , 2002López, 2001) in deformed plutonic rocks consistently demonstrate right-lateral transpression along the LOFZ in Late Miocene to Pliocene times.…”

Section: Introductionmentioning

confidence: 99%

“…To the north of the CTJ, the most obvious structure is the long-lived intra-arc Liquiñe-Ofqui fault zone (LOFZ, Hervé, 1976;Cembrano et al, 1996Cembrano et al, , 2000, which has accommodated an arc-parallel component of plate motion and controlled the emplacement of intrusions of the NPB (Hervé et al, 1993Pankhurst et al, 1992Pankhurst et al, , 1999Cembrano et al, 2002). Shaded relief digital elevation modeling (Rosenau et al, 2006), regional and structural fi eld mapping (Thiele et al, 1986;SERNAGEOMIN-BRGM, 1995 1 ;Diriason et al, 1998;Arancibia et al, 1999;Lavenu and Cembrano, 1999), microstructural analyses (Cembrano et al, 1996(Cembrano et al, , 2002Arancibia et al, 1999), and Ar/Ar laser-total fusion and step-heating geochronology of synkinematic minerals (Cembrano et al, , 2002López, 2001) in deformed plutonic rocks consistently demonstrate right-lateral transpression along the LOFZ in Late Miocene to Pliocene times. This interpretation is supported by apatite and zircon fi ssion track thermochronometric data collected along the southern Andes between 41° and 47°S, indicating an episode of enhanced cooling and denudation along the LOFZ in the Late Miocene to Pliocene (Thomson et al, 2001;Thomson, 2002;Adriasola et al, 2006).…”

Section: Introductionmentioning

confidence: 99%

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Cooling histories and deformation of plutonic rocks along the Liquiñe-Ofqui Fault Zone, Southern Chile (41°-42°15'S)

Adriasola

Stöckhert

2008

Rev. geol. Chile

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ABSTRACT. Structural and microstructural observations combined with apatite and zircon fi ssion-track thermochronology within two sectors of the Main Andean Range in the Los Lagos Region of Chile reveal an episodic history of intrusion and deformation in the North Patagonian Batholith (NPB). A dextral displacement of ~30 km along the Liquiñe-Ofqui fault zone (LOFZ) is inferred from the correlation of corresponding Cretaceous intrusions of the NPB across the fault zone at Reloncaví. Relative uplift of the western block in the late Miocene is indicated by apatite and zircon fi ssiontrack cooling histories. Microstructures in samples from Miocene and Cretaceous plutons along the fault zone generally indicate deformation at temperatures below ~300°C, with the exception of some samples from Cretaceous intrusions showing deformation at higher temperatures. In the Hornopirén area, signifi cant relative uplift of the eastern block is indicated by 1. the different styles of deformation observed across the fault zone, 2. kinematic analysis of a shear zone in tonalite and 3. geobarometry of contact metamorphic mineral assemblages. For the plutonic rocks in the Hornopirén area, extremely rapid cooling is indicated by thermochronometry, suggesting the activity of hydrothermal systems or thermal effects of late shallow intrusions.

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Section: Zircon and Apatite Fi Ssion-track Cooling Historiesmentioning

confidence: 57%

“…According to Ar/Ar dating by Cembrano et al (2000Cembrano et al ( , 2002, many of these were formed in Late Miocene to Pliocene times.…”

Section: Geological Settingmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Cooling histories and deformation of plutonic rocks along the Liquiñe-Ofqui Fault Zone, Southern Chile (41°-42°15'S)

Adriasola

Stöckhert

2008

Rev. geol. Chile

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“…This dextral strike-slip discontinuity is mainly a result of oblique plate convergence (Hervé, 1994) and collision of the Chile Rise at its southern end (Nelson et al, 1994). The LOFZ decouples the south-central Chilean forearc, which is suggested to behave as a northward gliding sliver (so-called 'Chiloé block', Fig.1) by several authors (Cembrano et al, 2002;Rosenau et al, 2006). At its northern edge, this block is bounded by the NW-striking Lanalhue fault system (Glodny et al, 2008a), which splays out from the LOFZ at ∼39°S.…”

Section: Regional Tectonic and Geologic Settingmentioning

confidence: 96%

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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Understanding kinematics of intra-arc transcurrent deformation: Paleomagnetic evidence from the Liquiñe-Ofqui fault zone (Chile, 38-41°S)

2014

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The Liquiñe-Ofqui fault zone (LOFZ) is a major~1000 km long dextral shear zone of southern Chile, likely related to strain partitioning of Nazca Plate oblique convergence with South America. To understand block rotation pattern along the LOFZ, we paleomagnetically sampled 55 sites (553 samples) between 38°S and 41°S. We gathered Oligocene to Pleistocene volcanics and Miocene granites at a maximum distance of 20 km from the LOFZ, and at both sides of it. Rotations with respect to South America, evaluated for 36 successful sites, show that crust around the LOFZ is fragmented in small blocks,~1 to 10 km in size. While some blocks (at both fault edges) undergo very large 150°-170°rotations, others do not rotate, even adjacent to fault walls. We infer that rotations affected equidimensional blocks, while elongated crust slivers were translated subparallel to the LOFZ, without rotating. Rotation pattern across the LOFZ is markedly asymmetric. East of the fault and adjacent to it, rotations are up to 150°-170°clockwise, and fade out~10 km east of fault. These data support a quasi-continuous crust kinematics, characterized by small rigid blocks drag by the underlying ductile crust flow, and imply 120 km of total fault offset. Conversely, crust west of the LOFZ is cut by seismically active NW-SE sinistral antithetic faults, and yields counterclockwise rotations up to 170°at 8-10 km from LOFZ, besides the unrotated blocks. Further data from the Chile fore arc are needed to understand block rotation kinematics and plate dynamics west of the LOFZ.

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Late Cenozoic transpressional ductile deformation north of the Nazca–South America–Antarctica triple junction

Cited by 134 publications

References 53 publications

Cooling histories and deformation of plutonic rocks along the Liquiñe-Ofqui Fault Zone, Southern Chile (41°-42°15'S)

Cooling histories and deformation of plutonic rocks along the Liquiñe-Ofqui Fault Zone, Southern Chile (41°-42°15'S)

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

Understanding kinematics of intra-arc transcurrent deformation: Paleomagnetic evidence from the Liquiñe-Ofqui fault zone (Chile, 38-41°S)

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