Thermobarometric data from a fossil zircon partial annealing zone in high pressure–low temperature rocks of eastern and central Crete, Greece

Brix, M.; Stöckhert, Bernhard; Seidel, Eberhard; Theye, Thomas; Thomson, S. N.; Küster, Martina

doi:10.1016/s0040-1951(02)00059-8

Cited by 110 publications

(81 citation statements)

References 37 publications

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“…For granite sample AA128, the high-T deformation must be older than 67±3.8 Ma, as the quartz microfabrics indicate deformation at temperatures above ca. 300°C, hence above the partial annealing zone for fi ssion tracks in zircon (Stöckhert et al, 1999;Brix et al, 2002).…”

Section: Discussionmentioning

confidence: 99%

“…Despite the differing post-magmatic cooling histories of the plutons exhumed along the fault zone, no signifi cant differences could be established in the microstructural record of deformation across the LOFZ. This can be best explained by the fact that the differences in the crustal level exhumed in the late Cenozoic cover temperatures below those required for dislocation creep of quartz to become effective (e.g., Stöckhert et al, 1999;Brix et al, 2002). The variable record of earlier ductile deformation at depth, in contrast, is not related to the late Cenozoic denudation episode revealed by fi ssion track thermochronometry.…”

Section: Microstructures Of Plutonic Rocks Along the Lofzmentioning

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: Discussionmentioning

confidence: 99%

Section: Microstructures Of Plutonic Rocks Along the Lofzmentioning

confidence: 99%

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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“…The crust underlying Crete is composed of compressional nappes that were emplaced between about 35 and 15 Ma (Jolivet and Brun, 2010 and references therein). Some of the nappe units were subducted and underplated between 24 and 19 Ma (Theye and Seidel, 1993) and rapidly exhumed by ∼ 18 to 16 Ma (Thomson et al, 1998;Brix et al, 2002;Rahl et al, 2005;Marsellos et al, 2010). Southward extension of the Aegean domain initiated at approximately 23 Ma, and since the Miocene horizontal brittle extension has dominated deformation in the upper crust (Angelier et al, 1982;Bohnhoff et al, 2001;Fassoulas, 2001;van Hinsbergen and Schmid, 2012).…”

Section: Geologic and Tectonic Setting Of Cretementioning

confidence: 99%

River profile response to normal fault growth and linkage: an example from the Hellenic forearc of south-central Crete, Greece

2017

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Abstract. Topography is a reflection of the tectonic and geodynamic processes that act to uplift the Earth's surface and the erosional processes that work to return it to base level. Numerous studies have shown that topography is a sensitive recorder of tectonic signals. A quasi-physical understanding of the relationship between river incision and rock uplift has made the analysis of fluvial topography a popular technique for deciphering relative, and some argue absolute, histories of rock uplift. Here we present results from a study of the fluvial topography from south-central Crete, demonstrating that river longitudinal profiles indeed record the relative history of uplift, but several other processes make it difficult to recover quantitative uplift histories. Prior research demonstrates that the south-central coastline of Crete is bound by a large ( ∼ 100 km long) E-W striking composite normal fault system. Marine terraces reveal that it is uplifting between 0.1 and 1.0 mm yr −1 . These studies suggest that two normal fault systems, the offshore Ptolemy and onshore South-Central Crete faults, linked together in the recent geologic past (ca. 0.4-1 My BP). Fault mechanics predict that when adjacent faults link into a single fault the uplift rate in footwalls of the linkage zone will increase rapidly. We use this natural experiment to assess the response of river profiles to a temporal jump in uplift rate and to assess the applicability of the stream power incision model to this setting. Using river profile analysis we show that rivers in south-central Crete record the relative uplift history of fault growth and linkage as theory predicts that they should. Calibration of the commonly used stream power incision model shows that the slope exponent, n, is ∼ 0.5, contrary to most studies that find n ≥ 1. Analysis of fluvial knickpoints shows that migration distances are not proportional to upstream contributing drainage area, as predicted by the stream power incision model. Maps of the transformed stream distance variable, χ, indicate that drainage basin instability, drainage divide migration, and river capture events complicate river profile analysis in south-central Crete. Waterfalls are observed in southern Crete and appear to operate under less efficient and different incision mechanics than assumed by the stream power incision model. Drainage area exchange and waterfall formation are argued to obscure linkages between empirically derived metrics and quasi-physical descriptions of river incision, making it difficult to quantitatively interpret rock uplift histories from river profiles in this setting. Karst hydrology, break down of assumed drainage area discharge scaling, and chemical weathering might also contribute to the failure of the stream power incision model to adequately predict the behavior of the fluvial system in south-central Crete.

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“…Both arcs are related to subduction of the African plate beneath the European plate and exhumation of high-pressure and low-temperature rocks, during multiple events and via multiple detachment faults (e.g. Fassoulas et al, 1994;Thomson et al, 1998;Lister et al, 2001, Brix et al, 2002, Jolivet et al, 2003, Brun & Faccena, 2008Marsellos et al, 2010). The Aegean Sea is an excellent example of episodic extension and exposes a wide range of regional detachment faults (e.g.…”

Section: Tectonic Setting and Geology Of Santorinimentioning

confidence: 99%

“…The Aegean Sea is an excellent example of episodic extension and exposes a wide range of regional detachment faults (e.g. Fassoulas et al, 1994;Thomson et al, 1999;Brix et al, 2002;Jolivet et al, 2003;Marsellos & Kidd, 2008;Ring et al, 2010;Skourtsos & Lekkas, 2010) and localized multi-detachments with more than one extension direction as observed in Kythera and Peloponnese (Marsellos et al, 2010). Correlation between structural data and thermochronological data has been shown to be useful in deconstructing multi-extensional complex tectono-low-thermal histories of HP-rocks associated with arc-normal or/and arc-parallel extensional detachments…”

Section: Tectonic Setting and Geology Of Santorinimentioning

confidence: 99%

An application of GIS analysis on structural data from metamorphic rocks in Santorini Island.

et al. 2016

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Thermobarometric data from a fossil zircon partial annealing zone in high pressure–low temperature rocks of eastern and central Crete, Greece

Cited by 110 publications

References 37 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)

River profile response to normal fault growth and linkage: an example from the Hellenic forearc of south-central Crete, Greece

An application of GIS analysis on structural data from metamorphic rocks in Santorini Island.

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