Development of a self-similar strike-slip duplex system in the Atacama Fault system, Chile

2011 ◽  
Vol 33 (11) ◽  
pp. 1611-1626 ◽  
Author(s):  
E. Jensen ◽  
J. Cembrano ◽  
D. Faulkner ◽  
E. Veloso ◽  
G. Arancibia
Keyword(s):  
Strike Slip ◽  
Fault System ◽  
Duplex System ◽  
Self Similar ◽  
Atacama Fault System

Fault zone development and strain partitioning in an extensional strike-slip duplex: A case study from the Mesozoic Atacama fault system, Northern Chile

2005 ◽  
Vol 400 (1-4) ◽  
pp. 105-125 ◽  
Author(s):  
J. Cembrano ◽  
G. González ◽  
G. Arancibia ◽  
I. Ahumada ◽  
V. Olivares ◽  
...  
Keyword(s):  
Fault Zone ◽  
Strike Slip ◽  
Fault System ◽  
Northern Chile ◽  
Strain Partitioning ◽  
Zone Development ◽  
Atacama Fault System

Jurassic to Early Cretaceous postaccretional sinistral transpression in north-central Chile (latitudes 31–32°S)

2011 ◽  
Vol 149 (2) ◽  
pp. 208-220 ◽  
Author(s):  
UWE RING ◽  
ARNE P. WILLNER ◽  
PAUL W. LAYER ◽  
PETER P. RICHTER
Keyword(s):  
Early Cretaceous ◽  
Shear Zones ◽  
White Mica ◽  
Strike Slip ◽  
Fault System ◽  
Low Grade ◽  
North Central ◽  
Central Chile ◽  
Metamorphic Basement ◽  
Atacama Fault System

AbstractWe describe the geometry and kinematics of a Jurassic to Early Cretaceous transpressive sinistral strike-slip system within a metamorphic basement inlier of the Mesozoic magmatic arc near Bahia Agua Dulce at latitudes 31–32°S in north-central Chile and discuss possible relations with the Atacama Fault System further north. Sinistral transpression overprints structures of an accretionary system that is represented by the metamorphic basement. Sub-vertical semi-ductile NNW-striking strike-slip shear zones are the most conspicuous structures. Chlorite and sericite grew, and white mica and quartz dynamically recrystallized, suggesting low-grade metamorphic conditions during semi-ductile deformation. Folds at the 10–100 metre scale developed before and during strike-slip shearing. The folds are deforming a former sub-horizontal transposition foliation that originated during prior accretion processes. The folds have axes sub-parallel to the strike-slip shear zones and sub-vertical axial surfaces indicating a component of shortening parallel to the shear-zone boundaries, suggesting an overall transpressive deformation regime. Transpressive strike-slip deformation also affects Middle Triassic (Anisian) basal breccias of the El Quereo Formation.40Ar–39Ar laser ablation ages of synkinematically recrystallized white mica in one of the shear zones provide an age of 174–165 Ma for the waning stages of semi-ductile strike-slip shearing. The semi-ductile shear zones are cut by mafic and rhyolite dykes. Two rhyolite dykes yield40Ar–39Ar ages of 160.5 ± 1.7 Ma and 131.9 ± 1.7 Ma, respectively. The latter dyke has been affected by brittle faulting. Fault-slip analysis shows that the kinematics of the faulting event is similar to the one of the semi-ductile shearing event, suggesting that sinistral transpression continued after ~130 Ma. Timing, kinematics and geographic position suggest that the shear zones at Bahia Agua Dulce represent a southern continuation of the prominent Atacama Fault System that affected the Jurassic/Early Cretaceous arc over its ~1400 km length.

scholarly journals The Relationship Between Magmatism and Deformation Along the Intra‐arc Strike‐Slip Atacama Fault System, Northern Chile

Tectonics ◽  
2020 ◽  
Vol 39 (3) ◽  
Author(s):  
N. M. Seymour ◽  
J. S. Singleton ◽  
S. P. Mavor ◽  
R. Gomila ◽  
D. F. Stockli ◽  
...  
Keyword(s):  
Strike Slip ◽  
Fault System ◽  
Northern Chile ◽  
Atacama Fault System ◽  
The Relationship

RHEOLOGICAL BEHAVIOR OF INTRA-ARC STRIKE-SLIP FAULTS: INSIGHTS FROM THE ATACAMA FAULT SYSTEM IN NORTHERN CHILE

2020 ◽  
Author(s):  
John S. Singleton ◽  
◽  
Nikki M. Seymour ◽  
Rachel C. Ruthven ◽  
Skyler P. Mavor ◽  
...  
Keyword(s):  
Rheological Behavior ◽  
Strike Slip ◽  
Fault System ◽  
Northern Chile ◽  
Atacama Fault System

scholarly journals Self-similar length-displacement scaling achieved by scale-dependent growth processes: Evidence from the Atacama Fault System

2020 ◽  
Vol 133 ◽  
pp. 103993
Author(s):  
A. Stanton-Yonge ◽  
J. Cembrano ◽  
W.A. Griffith ◽  
E. Jensen ◽  
T.M. Mitchell
Keyword(s):  
Fault System ◽  
Growth Processes ◽  
Similar Length ◽  
Self Similar ◽  
Dependent Growth ◽  
Atacama Fault System

Is the North Altyn fault part of a strike-slip duplex along the Altyn Tagh fault system?

Geology ◽  
2000 ◽  
Vol 28 (3) ◽  
pp. 255 ◽  
Author(s):  
Eric Cowgill ◽  
An Yin ◽  
Wang Xiao Feng ◽  
Zhang Qing
Keyword(s):  
Strike Slip ◽  
Fault System ◽  
Altyn Tagh Fault ◽  
The North ◽  
Altyn Tagh

Microearthquake seismicity and tectonics of Coastal Northern California

1970 ◽  
Vol 60 (5) ◽  
pp. 1669-1699 ◽  
Author(s):  
Leonardo Seeber ◽  
Muawia Barazangi ◽  
Ali Nowroozi
Keyword(s):  
High Frequency ◽  
Fault Plane ◽  
San Andreas Fault ◽  
High Gain ◽  
Strike Slip ◽  
Fault System ◽  
Northern California ◽  
Fault Plane Solutions ◽  
Sharp Bend ◽  
San Andreas

Abstract This paper demonstrates that high-gain, high-frequency portable seismographs operated for short intervals can provide unique data on the details of the current tectonic activity in a very small area. Five high-frequency, high-gain seismographs were operated at 25 sites along the coast of northern California during the summer of 1968. Eighty per cent of 160 microearthquakes located in the Cape Mendocino area occurred at depths between 15 and 35 km in a well-defined, horizontal seismic layer. These depths are significantly greater than those reported for other areas along the San Andreas fault system in California. Many of the earthquakes of the Cape Mendocino area occurred in sequences that have approximately the same magnitude versus length of faulting characteristics as other California earthquakes. Consistent first-motion directions are recorded from microearthquakes located within suitably chosen subdivisions of the active area. Composite fault plane solutions indicate that right-lateral movement prevails on strike-slip faults that radiate from Cape Mendocino northwest toward the Gorda basin. This is evidence that the Gorda basin is undergoing internal deformation. Inland, east of Cape Mendocino, a significant component of thrust faulting prevails for all the composite fault plane solutions. Thrusting is predominant in the fault plane solution of the June 26 1968 earthquake located along the Gorda escarpement. In general, the pattern of slip is consistent with a north-south crustal shortening. The Gorda escarpment, the Mattole River Valley, and the 1906 fault break northwest of Shelter Cove define a sharp bend that forms a possible connection between the Mendocino escarpment and the San Andreas fault. The distribution of hypocenters, relative travel times of P waves, and focal mechanisms strongly indicate that the above three features are surface expressions of an important structural boundary. The sharp bend in this boundary, which is concave toward the southwest, would tend to lock the dextral slip along the San Andreas fault and thus cause the regional north-south compression observed at Cape Mendocino. The above conclusions support the hypothesis that dextral strike-slip motion along the San Andreas fault is currently being taken up by slip along the Mendocino escarpment as well as by slip along northwest trending faults in the Gorda basin.

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