Metamorphic evolution of a very low- to low-grade metamorphic core complex (Danubian window) in the South Carpathians

2008 ◽  
Vol 298 (1) ◽  
pp. 281-315 ◽  
Author(s):  
Magda Ciulavu ◽  
Rafael Ferreiro Mählmann ◽  
Stefan M. Schmid ◽  
Heiko Hofmann ◽  
Antoneta Seghedi ◽  
...  
Keyword(s):  
Metamorphic Core Complex ◽  
Low Grade ◽  
The South ◽  
Core Complex ◽  
Metamorphic Evolution ◽  
Metamorphic Core

scholarly journals Microstructures of the Lim zone along the contact with Dinaridic Ophiolite nappe

2007 ◽  
pp. 1-7
Author(s):  
Aleksandar Ilic ◽  
Luka Pesic
Keyword(s):  
Microstructural Analysis ◽  
Metamorphic Core Complex ◽  
Ductile Deformation ◽  
Low Grade ◽  
The South ◽  
Core Complex ◽  
Deformation Event ◽  
Metamorphic Core

The Lim Zone is a part of the low-grade metamorphic core complex called the Lim Palaeozoic Unit, overlain by detached Triassic sedimentary successions. The Lim Unit is located in the footwall of overriding Dinaridic Ophiolite nappe. In general, three major ductile deformation phases could be observed on the boundary between the Lim Unit and the overriding Dinaridic Ophiolite nappe. In both, the Lim Unit and the Dinaridic ophiolite nappe, the major deformation event was related to the SSW-directed, oblique thrusting along the Dinaridic ophiolite thrust. The same orientation of the stretching lineation in both units is related to the predominant top-to-the-south shear, which suggests, therefore, oblique thrusting during the emplacement of the ophiolites over the Lim Unit. This paper deals with the results of microstructural analysis of Palaeozoic rocks of Lim Zone along the contact with Dinaridic ophiolite nappe.

P–T–t path for the lower plate of the Eocene Tatla Lake metamorphic core complex, southwestern Intermontane Belt, British Columbia

1992 ◽  
Vol 29 (5) ◽  
pp. 972-983 ◽  
Author(s):  
R. M. Friedman
Keyword(s):  
British Columbia ◽  
Metamorphic Core Complex ◽  
Crustal Thickening ◽  
Lower Plate ◽  
Normal Faults ◽  
Low Grade ◽  
Core Complex ◽  
T Path ◽  
C 50 ◽  
Metamorphic Core

The Tatla Lake metamorphic complex (TLMC) is a metamorphic core complex located along the western edge of the Intermontane Belt in southwestern interior British Columbia. Low- to moderate-angle normal faults separate lower plate greenschist- and amphibolite-grade, highly strained, commonly mylonitic rocks from unstrained to weakly deformed strata of the upper plate. The lower plate is divided into a core of granoblastic gneiss and migmatitic tonalite and an overlying, 1–2.5+ km thick mylonitic package called the ductilely sheared assemblage (DSA). Amphibolite-grade metamorphism of the gneissic core (Mc) largely accompanied the development and folding of gneissic layering (ca. 107–79 Ma). Eocene (ca. 55–47 Ma) fabric and mineral assemblages in the DSA (Ms) obscure any earlier history. Three metamorphic zones are observed within southern DSA metapelites with increasing structural depth: chlorite–biotite, garnet–staurolite, and garnet–staurolite–kyanite–sillimanite. The middle zone is about 300 m thick; the latter zone is now about 4 km below low-grade upper plate rocks, indicating late- or post-Ds metamorphic omission. DSA P–T conditions are calculated with the garnet–biotite thermometer and garnet–Al2SiO5–quartz–plagioclase (GASP) and total Al in hornblende barometers. Southern DSA metapelites record Eocene Ms conditions of 480–619 °C (± 50 °C), generally increasing with depth. One sample gave a calculated P–T of 0.72 ± 0.15 GPa and 500 ± 50 °C. P–T data from this area suggest that up to 10 km of structural section may be missing. Zoned garnet (pre-Ds) core to rim GASP pressures of 0.70–0.36 ± 0.15 GPa, for an outcrop-sized pelitic xenolith within a Late Cretaceous tonalitic body (U–Pb: 71 Ma) in the northwestern DSA, record its ascent during pluton emplacement and subsequent Eocene tectonic uplift. A total Al in hornblende crystallization pressure of 0.54 ± 0.1 GPa was calculated for the surrounding body. Biotite and hornblende K–Ar dates of 53.4–45.6 Ma for DSA and gneissic core rocks record cooling of the lower plate through the 530–280 °C (± 40 °C) interval. Mc metamorphism in the gneissic core is thought to have developed in response to crustal thickening and compression, beneath a regional mid-Cretaceous thrust belt. Characteristics of Eocene Ms metamorphism in the DSA, such as truncated and thinned metamorphic zones, are consistent with development during extensional tectonic exhumation of the lower plate.

scholarly journals Mesozoic Extensional Tectonics in Eastern Asia: The South Liaodong Peninsula Metamorphic Core Complex (NE China)

2008 ◽  
Vol 116 (2) ◽  
pp. 134-154 ◽  
Author(s):  
Wei Lin ◽  
Michel Faure ◽  
Patrick Monié ◽  
Urs Schärer ◽  
Dominique Panis
Keyword(s):  
Metamorphic Core Complex ◽  
Extensional Tectonics ◽  
Eastern Asia ◽  
The South ◽  
Core Complex ◽  
Ne China ◽  
Liaodong Peninsula ◽  
Metamorphic Core

scholarly journals Low-grade retrogression of a high-temperature metamorphic core complex: Naxos, Cyclades, Greece

2016 ◽  
Vol 129 (1-2) ◽  
pp. 93-117 ◽  
Author(s):  
Shuyun Cao ◽  
Franz Neubauer ◽  
Manfred Bernroider ◽  
Johann Genser ◽  
Junlai Liu ◽  
...  
Keyword(s):  
High Temperature ◽  
Metamorphic Core Complex ◽  
Low Grade ◽  
Core Complex ◽  
Metamorphic Core

scholarly journals Extensional unroofing of the Veliki Jastrebac dome (Serbia)

2007 ◽  
pp. 21-27 ◽  
Author(s):  
Milun Marovic ◽  
Ilija Djokovic ◽  
Marinko Toljic ◽  
Darko Spahic ◽  
Jelena Milivojevic
Keyword(s):  
Late Cretaceous ◽  
Vertical Section ◽  
Metamorphic Core Complex ◽  
Metamorphic Rocks ◽  
Low Grade ◽  
Structural Elements ◽  
Extensional Tectonics ◽  
Core Complex ◽  
Vardar Zone ◽  
Metamorphic Core

This paper presents the basic structural elements of the dome of Veliki Jastrebac, as well as the chronology and mechanisms of the deformational events responsible for its formation. It was determined that the dome of Veliki Jastrebac consists of two large sequences which are, in the vertical section, in the inverse position. The lower part is made of Late Cretaceous and Cretaceous-Palaeogene low-grade to medium-grade metamorphic rocks, which are intruded by Paleogene granitoid (probably the Vardar Zone), which are covered with a large overthrust consisting metamorphics of the Serbian-Macedonian Mass. The low-grade to medium-grade metamorphosed complex of Veliki Jastrebac, with the granitoid, represents a metamorphic core complex, exhumed by mechanisms of extensional tectonics in the Paleogene.

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