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Anta Formation

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Journal Article
Journal: Economic Geology
Published: 01 December 2003
Economic Geology (2003) 98 (8): 1575–1605.
... the middle Eocene to early Oligocene Anta Formation, a sequence of >1,000 m of andesite lava flows and dacite pyroclastic flows with interbedded volcaniclastic conglomerate. Sedimentary rocks include the red beds of the Eocene to early Oligocene San Jerónimo Group and the postmineralization late...
FIGURES | View All (14)
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Figure A1. Vector end-point diagrams ( Zijderveld, 1967 ) showing the therm...
Published: 01 November 2000
Figure A1. Vector end-point diagrams ( Zijderveld, 1967 ) showing the thermal demagnetization of representative samples from the Arroyo González section. (A) GZ-5A—a red siltstone from near the top of the Río Seco Formation. (B) GZ-37C—a green siltstone from above the dated tuff in the Anta
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F ig . 11. Schematic sequence of cross sections illustrating the <span class="search-highlight">formation</span> ...
Published: 01 December 2003
. Volcanism of the Anta Formation (Anta Arc) is important at the Western Cordillera-Altiplano transition. Deformation along the Zongo-San Gabán zone, interpreted to have occurred at the craton-orogen interface ( Farrar et al., 1988 ; Clark, 1993 ; Sandeman et al., 1995 ), is shown for reference. c
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TABLE 2. FISSION TRACK AGES (ZIRCON) FROM AIR-FALL VOLCANIC BEDS IN THE ANT...
Published: 01 November 2000
TABLE 2. FISSION TRACK AGES (ZIRCON) FROM AIR-FALL VOLCANIC BEDS IN THE ANTA FORMATION
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TABLE 3.  40 Ar/ 39 Ar—TOTAL FUSION AGE (HORNBLENDE) FROM AIR-FALL VOLCANIC...
Published: 01 November 2000
TABLE 3. 40 Ar/ 39 Ar—TOTAL FUSION AGE (HORNBLENDE) FROM AIR-FALL VOLCANIC BEDS IN THE ANTA FORMATION
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Figure 5. The Arroyo González stratigraphic section (adapted from Yacimien...
Published: 01 November 2000
Figure 5. The Arroyo González stratigraphic section (adapted from Yacimientos Petrolíferos Fisicales field records). Paleomagnetic site locations and their polarities are marked with black and white circles. The dated tuff is located at the 760 m level in the Anta Formation
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Figure 7. Schematic of the Termas Hill landslide. (A) Plan view. (B) Block ...
Published: 01 April 2006
Figure 7. Schematic of the Termas Hill landslide. (A) Plan view. (B) Block diagram along dashed line XY in A (regolith in white; Anta Formation in light gray). The subsurface structure in the right half of diagram is speculative. Note the main slip surface cut by a subsequent normal listric fault
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Figure 8. Sediment accumulation history for the Metán Subgroup at Arroyo G...
Published: 01 November 2000
Figure 8. Sediment accumulation history for the Metán Subgroup at Arroyo González using measured thicknesses. The sediment accumulation rate doubled ca. 14.5 Ma during deposition of the Anta Formation and at about the time that a reversal in paleocurrent flow direction took place. The point
Journal Article
Journal: GSA Bulletin
Published: 01 November 2000
GSA Bulletin (2000) 112 (11): 1736–1751.
...Figure A1. Vector end-point diagrams ( Zijderveld, 1967 ) showing the thermal demagnetization of representative samples from the Arroyo González section. (A) GZ-5A—a red siltstone from near the top of the Río Seco Formation. (B) GZ-37C—a green siltstone from above the dated tuff in the Anta...
FIGURES | View All (14)
Journal Article
Published: 01 April 2006
Environmental & Engineering Geoscience (2006) 12 (4): 369–376.
...Figure 7. Schematic of the Termas Hill landslide. (A) Plan view. (B) Block diagram along dashed line XY in A (regolith in white; Anta Formation in light gray). The subsurface structure in the right half of diagram is speculative. Note the main slip surface cut by a subsequent normal listric fault...
FIGURES | View All (7)
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F ig . 6. Schematic paleogeographic reconstruction of the study area during...
Published: 01 December 2003
F ig . 6. Schematic paleogeographic reconstruction of the study area during late Eocene to early Oligocene time. Note the intimate spatial relationship between batholithic plutons, volcanic rocks of the Anta Formation, and the sedimentary basins of the San Jerónimo Group in this reconstruction
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Figure 5. (A) Pluck marks slightly inclined downslope and downstepping up t...
Published: 01 April 2006
exposing strata of the Anta Formation in the background and part of the displaced service road in the foreground. Note the tension cracks near the bottom of the photograph and he compression ridge in the middleground. Person for scale. Photograph courtesy of J. G. Viramonte.
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F ig . 4. Summary stratigraphic columns for representative Eocene to presen...
Published: 01 December 2003
., 2002). Column C for the study area compiled after Carlotto (1998) , with additions after Carlier et al. (1989 , 1996 ) and this study. In column C, note the spatial and temporal relationships between batholithic plutons, volcanic rocks of the Anta Formation, and the sedimentary red bed sequences
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F ig . 5. Distribution and age of the Andahuaylas-Yauri batholith in the st...
Published: 01 December 2003
F ig . 5. Distribution and age of the Andahuaylas-Yauri batholith in the study area. a. Displays the main body of the batholith ( Fig. 2 ) and the location of the K-Ar age data from the present study ( Table 2 ) and Carlotto (1998) . b. Available K-Ar age data relative to volcanism of the Anta
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Figure 1. Location maps. (A) South America with Argentina outlined and squa...
Published: 01 April 2006
map overlaid on a Thematic Mapper satellite image (white rectangle represents area of landslide; x  =  campsite adjoining large pond; r  =  topographic ridge; f  =  reverse fault affecting Termas Hill landslide; Q  =  Quaternary deposits; A  =  Anta Formation, geology taken from Seggiaro and others
Journal Article
Published: 01 August 1974
Journal of the Geological Society (1974) 130 (4): 295–308.
... Society of London 1974 1974 Geological Society of London References Anderson E. M. The dynamics of the formation of cone sheets, ring-dykes and cauldron subsidences Proc R Soe Edinb 1936 56 128 163 Bailey E. B. The Geology of Ben Nevis and Glencoe and the surrounding...
Journal Article
Journal: Lithosphere
Publisher: GSW
Published: 01 June 2010
Lithosphere (2010) 2 (3): 153–171.
... and siltstone interbedded with laminated greenish mudstone, and (2) stratified, whitish oolitic limestone, in 5–20-cm-thick beds. Lithofacies suggest the correlation of these sediments with the Anta Formation. On the southern side of the Cerro Negro (Río Quevitas), almost six different lava flows, 3–20 m thick...
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Journal Article
Published: 01 February 2004
American Mineralogist (2004) 89 (2-3): 257–265.
... at the time of formation. * E-mail: seto@kueps.kyoto-u.ac.jp The mineral scapolite,[(Na, Ca, K) 4 Al 3 (Al, Si) 3 Si 6 O 24 (Cl, CO 3 , SO 4 )], is found in a wide variety of metamorphic and igneous rocks that have been altered by interactions with crustal fluids. Scapolite is a potential indicator...
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Series: Special Publications of the Society of Economic Geologists
Published: 01 January 2005
DOI: 10.5382/SP.11.11
EISBN: 9781629490359
... in the region; and the fluviodeltaic and lacustrine rocks of the Paleocene Quilque and Chilca Formations ( Fig. 4 ). Cenozoic units include the andesitic volcanic and sedimentary Anta Formation and the red beds of the San Jerónimo Group, both of Eocene to early Oligocene age ( Carlotto, 1998 ; Perelló et al...
FIGURES | View All (11)
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A. View to the southeast showing the Paracatu orebody main hypogene ore zon...
Published: 01 November 2015
Landim (SL) Formation, containing the highest-strain zones defining the main thrust of the Canastra over the Vazante Group, grading upward into the Morro do Ouro (MO) Member of the Paracatu Formation, containing the orebody as indicated, then upward into the barren Serra da Anta (SA) Member