Anisotropy of magnetic susceptibility study in two classical localities of the Gastre Fault System, central Patagonia

Zaffarana, Claudia Beatriz; Luchi, Mónica G. López de; Somoza, Rubén; Mercader, R. C.; Giacosa, Raúl Eduardo; Martino, Roberto

doi:10.1016/j.jsames.2010.10.003

Cited by 18 publications

(33 citation statements)

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“…Franzese and Martino (1998) contradicted Rapela et al, (1991) suggesting mainly oblique reverse deformation. Recently, based on field observations, Gosena and Loske (2004) and Zaffarana et al (2010) suggested that the rocks associated with the GFS do not show evidence supporting the existence of a major dextral fault system. Currently, the amount of displacement, and the timing of the deformation remains a subject of debate.…”

Section: Accepted Manuscript 28mentioning

confidence: 99%

New starting point for the Indian Ocean: Second phase of breakup for Gondwana

Thompson

Moulin

Aslanian

et al. 2019

Earth-Science Reviews

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The amalgamation of Gondwana and its subsequent fragmentation has been a subject of several studies over the past five decades, yet the very important question of the initial geometry of the supercontinent remains enigmatic. Current reconstruction models of the Indian Ocean are characterized by large gaps, overlaps and misfits of major structural and Cratonic bodies in their fit, and positions of tectonic blocks that are inconsistent with field observations, a phenomenon sustained by inadequate data, long standing debates and a lack of consensus on the nature of major structures and basins in the ocean. Past attempts to reconstruct the initial fit of the ocean has led to varied and complex models, with their own logic and different geographical limits, whose validity and underlying assumptions require testing in the light of current global geological and geophysical data. Our analysis of these models and their consequences on the continental passive margins brings to the fore critical scientific questions and the incoherencies that exist between them. This paper presents a compressive study of the structure of the Precambrian basement, Paleozoic marginal and rift basins of the plates constituting the Indian Ocean, examining the architecture and geochronological composition of their composing Cratons and crustal blocks, and delineating important structural markers to juxtapose them in full-fit reconstructions. We introduce a new holistic model from Gondwana's initial geometry to Chron 34, achieved through a combination of onshore and offshore geological and geophysical data. Our new model is coherent with current data interpretations of major structures across the Indian Ocean. Consistent with the interpretation of the Beira High as continental crust, and recent seismic refraction interpretation of the Pamela MOZ3-5 expedition in the Northern Mozambique Ridge and Northern Natal Valley. The model also permits full extent of major cratonic, volcanic and sedimentary structures within the supercontinent, and presents a new synthesis upon which further work may be projected.

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Section: Accepted Manuscript 28mentioning

confidence: 99%

New starting point for the Indian Ocean: Second phase of breakup for Gondwana

Thompson

Moulin

Aslanian

et al. 2019

Earth-Science Reviews

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“…In the vicinity of Villarrica Volcano, the ESE-WNW-aligned Mocha-Villarrica fault zone (MVFZ; Rapela & Pankhurst 1992;Hackney et al 2006;Zaffarana et al 2010) crosscuts and offsets the LOFS (Fig. 1).…”

Section: G E O L O G I C a L S E T T I N Gmentioning

confidence: 99%

Resistivity distribution from mid-crustal conductor to near-surface across the 1200 km long Liquiñe-Ofqui Fault System, southern Chile

Schill

Pavez

Díaz

et al. 2016

Geophysical Journal International

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“…In this paper we report palaeomagnetic results and 40 Ar/ 39 Ar ages from Jurassic rocks that rest unconformably on the Late Triassic granitoids of the Central Patagonian Batholith (Rapela et al 1992;Zaffarana et al 2010). These Triassic granitoids were considered as the main carrier of the deformational evidence for supporting the transcontinental, dextral kinematics commonly attributed to the Gastre Fault System (e.g.…”

mentioning

confidence: 94%

“…Moreover, recent work (von Gosen & Loske 2004;Zaffarana et al 2010Zaffarana et al , 2012 has shown that the geological record in Gastre shows neither the intensity nor the kinematics or indeed the timing of deformation as required in previous Gondwana breakup models. Currently, the transcontinental fault zones required to accommodate the relative motion between the Patagonian blocks remain cryptic and unobserved (Zaffarana et al 2010(Zaffarana et al , 2012.…”

mentioning

confidence: 96%

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Palaeomagnetism and ⁴⁰ Ar/ ³⁹ Ar dating from Lower Jurassic rocks in Gastre, central Patagonia: further data to explore tectonomagmatic events associated with the break-up of Gondwana

Zaffarana

Somoza

2012

JGS

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Anisotropy of magnetic susceptibility study in two classical localities of the Gastre Fault System, central Patagonia

Cited by 18 publications

References 50 publications

New starting point for the Indian Ocean: Second phase of breakup for Gondwana

New starting point for the Indian Ocean: Second phase of breakup for Gondwana

Resistivity distribution from mid-crustal conductor to near-surface across the 1200 km long Liquiñe-Ofqui Fault System, southern Chile

Palaeomagnetism and ⁴⁰ Ar/ ³⁹ Ar dating from Lower Jurassic rocks in Gastre, central Patagonia: further data to explore tectonomagmatic events associated with the break-up of Gondwana

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Anisotropy of magnetic susceptibility study in two classical localities of the Gastre Fault System, central Patagonia

Cited by 18 publications

References 50 publications

New starting point for the Indian Ocean: Second phase of breakup for Gondwana

New starting point for the Indian Ocean: Second phase of breakup for Gondwana

Resistivity distribution from mid-crustal conductor to near-surface across the 1200 km long Liquiñe-Ofqui Fault System, southern Chile

Palaeomagnetism and 40 Ar/ 39 Ar dating from Lower Jurassic rocks in Gastre, central Patagonia: further data to explore tectonomagmatic events associated with the break-up of Gondwana

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Palaeomagnetism and ⁴⁰ Ar/ ³⁹ Ar dating from Lower Jurassic rocks in Gastre, central Patagonia: further data to explore tectonomagmatic events associated with the break-up of Gondwana