Interacción entre la Granodiorita Pinchal y el Xenolito kilométrico de Cerro Negro, Sierra de Moreno, Región de Antofagasta, Chile

Niemeyer, Hans; Nava, Marcelo; Soto, Iván Sánchez

doi:10.4067/s0716-02082006000100001

Cited by 4 publications

(19 citation statements)

References 14 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In south-central Chile, the Principal Cordillera can be further subdivided into a western and an eastern domain based on predominant stratigraphic units. The western domain is characterized by extensive Oligo-Miocene nonmarine volcanic rocks, along with rarer occurrences of Upper Cretaceous and Miocene plutonic rocks, and Plio-Quaternary volcanic rocks (Contreras et al, 2022;Niemeyer & Muñoz, 1983;Spikings et al, 2008;Suárez & Emparán, 1997). The eastern part of the Principal Cordillera is primarily composed of upper Oligocene to upper Miocene nonmarine sedimentary and volcanic rocks, as well as Plio-Pleistocene nonmarine volcanic rocks (Flynn et al, 2008;Folguera et al, 2007;Niemeyer & Muñoz, 1983;Rojas Vera et al, 2016;Suárez & Emparán, 1997).…”

Section: Regional Geologic Characteristicsmentioning

confidence: 99%

“…The western domain is characterized by extensive Oligo-Miocene nonmarine volcanic rocks, along with rarer occurrences of Upper Cretaceous and Miocene plutonic rocks, and Plio-Quaternary volcanic rocks (Contreras et al, 2022;Niemeyer & Muñoz, 1983;Spikings et al, 2008;Suárez & Emparán, 1997). The eastern part of the Principal Cordillera is primarily composed of upper Oligocene to upper Miocene nonmarine sedimentary and volcanic rocks, as well as Plio-Pleistocene nonmarine volcanic rocks (Flynn et al, 2008;Folguera et al, 2007;Niemeyer & Muñoz, 1983;Rojas Vera et al, 2016;Suárez & Emparán, 1997). Locally, Upper Cretaceous-Paleocene volcanic rocks and Lower-Middle Jurassic marine sedimentary and volcanic rocks are also exposed (Suárez & Emparán, 1997).…”

Section: Regional Geologic Characteristicsmentioning

confidence: 99%

“…Paleozoic, Mesozoic, Paleogene, and Miocene rocks in the Principal Cordillera and the Agrio and Chos Malal FTBs typically display significant deformation, characterized by tight folding and reverse faulting (Flynn et al, 2008;Niemeyer & Muñoz, 1983;Rojas Vera et al, 2016). These formations are locally covered by subhorizontal Plio-Pleistocene volcanic rocks of the Cola de Zorro Formation and equivalent units (Jordan et al, 2001;Muñoz & Niemeyer, 1984;Niemeyer & Muñoz, 1983;Rojas Vera et al, 2016;Suárez & Emparán, 1995, 1997. In contrast, Upper Cretaceous and Cenozoic rocks in the foreland region generally remain undeformed.…”

Section: Regional Geologic Characteristicsmentioning

confidence: 99%

“…González and Vergara (1962). Subsequently, Niemeyer and Muñoz (1983) subdivided this unit into a lower volcanic member (CMV from now on) and an upper sedimentary member (CMS from now on). Muñoz and Niemeyer (1984) and Suárez and Emparán (1995) expanded the boundaries of this unit to encompass Oligocene-Miocene volcanic and sedimentary rocks previously attributed to other formations across a wide area of the Principal Cordillera spanning from 36° to 38°S (figs.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Cenozoic Basin Evolution During Alternating Extension and Shortening in the Southern Central Andes Along the Chile-Argentina Border, 37–38°S

Encinas,

Rosselot,

Sagripanti

et al. 2024

American Journal of Science

View full text Add to dashboard Cite

The south-central Chile and Argentina margin experienced a regional phase of extensional tectonics during the Oligocene–early Miocene, forming several basins across the forearc, Andean Cordillera, and retroarc regions. These basins accumulated thick successions of volcanic and sedimentary rocks. Subsequently, Neogene contractional tectonics led to the development of the current Andean Cordillera and the deposition of synorogenic clastic deposits in foreland basins. Traditionally, the Cura Mallín Formation, comprising a lower volcanic unit (CMV) and an upper sedimentary unit (CMS), has been interpreted to have formed during the Oligocene–early Miocene extensional phase. However, some studies propose deposition of the CMS in a foreland basin during the early–late Miocene. To unravel the transition from extensional to contractional tectonics in the Andes of south-central Chile and Argentina, we conducted new geochronological analyses (U-Pb, LA-ICP-MS) and integrated these results with structural, stratigraphic, and sedimentological observations in key sections within the CMS and the overlying Trapa-Trapa Formation in the Principal Cordillera along the Chile-Argentina border (37°–38°S). Our findings indicate that only the lower part of the CMS was deposited in an extensional setting, as evidenced by the presence of an inverted extensional wedge dated at ∼20 Ma. The middle-upper CMS (∼19 to 9 Ma) and contemporaneous units to the east exhibit evidence of syncontractional deformation, suggesting deposition in a foreland basin generated by shortening of the western Principal Cordillera. Around 9 Ma, uplift of the Agrio and Chos Malal fold and thrust belts, east of the Principal Cordillera, led to segmentation of the foreland basin. The Trapa Trapa Formation was deposited in a hinterland basin, with sediment sourced from the east. After ∼6.5 Ma, major contractional deformation shifted westward, resulting in intense folding of the CMS and Trapa Trapa Formation and subsequent thrusting of the western Principal Cordillera over the Central Depression. Our study suggests that deformation progressed toward the eastern foreland during the early to late Miocene and then shifted toward the western forearc during the late Miocene to Pleistocene.

show abstract

Section: Regional Geologic Characteristicsmentioning

confidence: 99%

Section: Regional Geologic Characteristicsmentioning

confidence: 99%

Section: Regional Geologic Characteristicsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Cenozoic Basin Evolution During Alternating Extension and Shortening in the Southern Central Andes Along the Chile-Argentina Border, 37–38°S

Encinas,

Rosselot,

Sagripanti

et al. 2024

American Journal of Science

View full text Add to dashboard Cite

show abstract

“…2019) and Galera (Niemeyer et al . 1984) formations, as an informal ‘Pampa Castillo’ Formation (Scalabrino 2009; Folguera et al . 2018), or simply as an ‘unnamed’ formation (Flynn et al .…”

Section: Geological Settingmentioning

confidence: 99%

Caviomorphs (Rodentia, Hystricognathi) from Pampa Castillo, Chile: new octodontoid records and biochronological implications

McGrath

Flynn

Croft

et al. 2023

Papers in Palaeontology

View full text Add to dashboard Cite

Caviomorph rodents have been diverse and abundant components of South American mammal communities since the late Eocene. We describe herein the octodontoids of Pampa Castillo, a Lower Miocene site in southern Chile (Aysén Region). Six genera and seven species of octodontoids are present, two of which are new: Dudumus berggreni sp. nov. and Caviocricetus guenekko sp. nov. The octodontoids from Pampa Castillo support assignment of this fauna to the Santacrucian South American Land Mammal Age (SALMA), which is consistent with previous studies. We conducted similarity analyses on 11 Early–Middle Miocene Patagonian rodent faunas using hierarchical clustering. Faunas generally fell into the three SALMAs to which they were traditionally assigned: Colhuehuapian, Santacrucian and ‘post‐Santacrucian’. The ‘Pinturan’ is a proposed biochronological interval between the Colhuehuapian and Santacrucian. At the genus level, Pampa Castillo clustered with ‘Pinturan’ faunas, while at the species level it clustered with the ‘typical’ faunas on which the Santacrucian SALMA is based (from outcrops of the Santa Cruz Formation along the Atlantic coast and Río Santa Cruz). The Pampa Castillo rodent fauna resembles both ‘Pinturan’ and ‘typical’ Santacrucian faunas in taxon distributions, reflecting complex temporal and palaeoenvironmental influences. Geochronological data indicate that some ‘Pinturan’ sites overlap temporally with Pampa Castillo and the upper Pinturas Formation, which both clustered with ‘typical’ Santacrucian faunas. These results indicate that the ‘Pinturan’ does not represent a distinct biochronological interval, but that the differences between it and ‘typical’ Santacrucian faunas are attributable to geographic or palaeoenvironmental differences.

show abstract

The pre-Mesozoic rocks of northern Chile: U–Pb ages, and Hf and O isotopes

Pankhurst

Hervé

Calderón

et al. 2016

Earth-Science Reviews

View full text Add to dashboard Cite

Interacción entre la Granodiorita Pinchal y el Xenolito kilométrico de Cerro Negro, Sierra de Moreno, Región de Antofagasta, Chile

Cited by 4 publications

References 14 publications

Cenozoic Basin Evolution During Alternating Extension and Shortening in the Southern Central Andes Along the Chile-Argentina Border, 37–38°S

Cenozoic Basin Evolution During Alternating Extension and Shortening in the Southern Central Andes Along the Chile-Argentina Border, 37–38°S

Caviomorphs (Rodentia, Hystricognathi) from Pampa Castillo, Chile: new octodontoid records and biochronological implications

The pre-Mesozoic rocks of northern Chile: U–Pb ages, and Hf and O isotopes

Contact Info

Product

Resources

About