Three generations of monazite in Austroalpine basement rocks to the south of the Tauern Window: evidence for Variscan, Permian and Eo-Alpine metamorphic events

2012 ◽  
Vol 105 (3) ◽  
pp. 343-360 ◽  
Author(s):  
Erwin Krenn ◽  
Bernhard Schulz ◽  
Fritz Finger
Keyword(s):  
The South ◽  
Tauern Window ◽  
Three Generations ◽  
Basement Rocks ◽  
Austroalpine Basement

scholarly journals Age constraints on the evolution of the Austroalpine basement to the south of the Tauern Window

2006 ◽  
Vol 96 (3) ◽  
pp. 415-432 ◽  
Author(s):  
Siegfried Siegesmund ◽  
Till Heinrichs ◽  
Rolf L. Romer ◽  
Daniel Doman
Keyword(s):  
The South ◽  
Tauern Window ◽  
Austroalpine Basement ◽  
Age Constraints

Mediated diffusion in Iron Age Europe

Antiquity ◽  
2010 ◽  
Vol 84 (325) ◽  
pp. 880-883
Author(s):  
N. James
Keyword(s):  
Iron Age ◽  
Western Europe ◽  
Social Complexity ◽  
Sociopolitical Development ◽  
Regional Power ◽  
The South ◽  
Three Generations ◽  
Middle Iron Age ◽  
Rhone Valley ◽  
North Western

Diffusion of Mediterranean traits to central and north-western Europe during the middle Iron Age is a topic well rehearsed now by three generations of archaeologists. The stimulating recent exhibition Golasecca at the Musée d’Archéologie nationale in France, showed that – funds permitting – plenty of scope remains for research.Elaborately made imports, at for instance the Heuneburg, Vix or Hochdorf, have been interpreted as evidence for how aristocrats adopted Greek and Etruscan styles to reinforce their status and regional power between about 600 and 400 BC. Art historians revealed how their bronzesmiths responded selectively to templates from not only states to the south but also eastern nomads. Archaeologists worked out how goods were brought up the Rhône valley by the enterprising Greeks of Marseille or by the northerners themselves exploiting that colony. The ‘trade’ is thought to have encouraged development of social complexity. More recently, to demonstrate the recipients’ ‘agency’, attention has focused on potters’ responses, adoption of coinage and writing and ‘feasts’ for chiefs to show off ‘prestigious’ exotica to rivals, clients or tributaries. Similar models of trade, ‘appropriation’ and sociopolitical development have been developed for the Late Pre-Roman Iron Age and the Roman Iron Age.

Microstructures and mineral chemistry in amphibolites from the western Tauern Window (Eastern Alps), and P-T deformation paths of the Alpine greenschist-amphibolite facies metamorphism

1995 ◽  
Vol 59 (397) ◽  
pp. 641-659 ◽  
Author(s):  
Bernhard Schulz ◽  
Claude Triboulet ◽  
Claude Audren
Keyword(s):  
Mineral Chemistry ◽  
Eastern Alps ◽  
Amphibolite Facies ◽  
Tauern Window ◽  
Metamorphic History ◽  
Lithostratigraphic Units ◽  
Facies Metamorphism ◽  
Austroalpine Basement ◽  
T Deformation Paths ◽  
Extension Axis

AbstractAmphibolites in the Mesozoic part of the parautochthonous Lower Schieferhülle (LSH), the allochthonous Upper Schieferhülle (USH) and the overlying Austroalpine basement (AA) in and around the western Tauern Window (Eastern Alps) suffered a progressive Alpine deformation. Lineations and foliations L1-S1, L2-S2 defined by preferentially oriented (Na-Ca) amphiboles as well as F3 folds and further foliations Smyl and S4 in the metabasites are structures of successive deformational stages with a constant W-E main extension axis of strain. The (Na-Ca) amphiboles in assemblages with epidote, chlorite, albite/oligoclase and quartz are zoned with similar continuous zonation trends from early actinolite in the cores to magnesio-hornblende and tschermakitic hornblende, and from magnesio-hornblende to late actinolite in the rims in the three lithostratigraphic units. Geothermobarometry involving tremolite-edenite and (pargasite-hastingsite)-tremolite end-member equilibria in amphiboles allowed us to reconstruct prograde-retrograde P-T paths for the Alpine greenschist-amphibolite facies event. The paths passed P/Tmax at 6–7 kbar/600°C. Similar shapes of the paths in AA, USH and Mesozoic LSH indicate a common metamorphic history and a stacking of these units prior to or during the pre-Pmax evolution. Moderate P-T ratios are characteristic for the temperature-dominated compression paths and indicate continental collisional rather than subduction zone metamorphism. The middle to late Alpine greenschist-amphibolite facies event appears as an independent metamorphism along a complete P-T loop which may have followed an earlier and poorly documented high-pressure/low-temperature event.

scholarly journals Tectonic evolution and high-pressure rock exhumation in the Qiangtang Terrane, Central Tibet

2015 ◽  
Vol 7 (1) ◽  
pp. 329-367 ◽  
Author(s):  
Z. Zhao ◽  
P. D. Bons ◽  
G. Wang ◽  
A. Soesoo ◽  
Y. Liu
Keyword(s):  
High Pressure ◽  
Tectonic Evolution ◽  
Late Triassic ◽  
The South ◽  
Metamorphic Belt ◽  
The North ◽  
Ophiolitic Mélange ◽  
Basement Rocks ◽  
Central Tibet ◽  
Qiangtang Terrane

Abstract. Conflicting interpretations of the > 500 km long, east-west trending Qiangtang Metamorphic Belt have led to very different and contradicting models for the Permo-Triassic tectonic evolution of Central Tibet. We define two metamorphic events, one that only affected Pre-Ordovician basement rocks and one subduction-related Triassic high-pressure metamorphism event. Detailed mapping and structural analysis allowed us to define three main units that were juxtaposed due to collision of the North and South Qiangtang terranes after closure of the Ordovician-Triassic ocean that separated them. The base is formed by the Precambrian-Carboniferous basement, followed by non-metamorphic ophiolitic mélange, containing mafic rocks that range in age from the Ordovician to Middle Triassic. The top of the sequence is formed by strongly deformed sedimentary mélange that contains up to > 10 km size rafts of both un-metamorphosed Permian sediments and high-pressure blueschists. We propose that the high-pressure rocks were exhumed from underneath the South Qiangtang Terrane in an extensional setting caused by the pull of the northward subducting slab of the Shuanghu-Tethys. High-pressure rocks, sedimentary mélange and margin sediments were thrust on top of the ophiolitic mélange that was scraped off the subducting plate. Both units were subsequently thrust on top of the South Qiantang Terrane continental basement. Onset of Late Triassic sedimentation marked the end of the amalgamation of both Qiangtang terranes and the beginning of spreading between Qiantang and North Lhasa to the south, leading to the deposition of thick flysch deposits in the Jurassic.

Structure du plateau continental armoricain

1975 ◽  
Vol 279 (1288) ◽  
pp. 109-121 ◽  
Keyword(s):  
Ground Level ◽  
Magnetic Anomalies ◽  
Magnetic Survey ◽  
Positive Anomaly ◽  
The South ◽  
The North ◽  
Basement Rocks ◽  
Average Accuracy ◽  
Magnetic Field Model ◽  
History Of

Between 1965 and 1970 there has been conducted, in collaboration with the hydrographic service of the French navy, a magnetic survey of the Armorican continental plateau. The zone, covered with 48000 km of profiles, stretches between the parallels of 46° 10' N and 49° 30' N and between the meridians 4° W and 7° 15' W. Position fixing was carried out by means of Toran, with an average accuracy of 50 m. Maps of the total field intensity, reduced to epoch 1967.5, and the magnetic anomalies have been drawn to the scale 1:250000. The magnetic anomalies have been calculated by means of a magnetic field model defined by Jensen and Cain. Two major zones of anomaly can be identified: a northern one, bounded to the south by the 48° N parallel, with strong relief, where the magnetic anomalies are numerous and include major ones at the entrance to the Channel; a southern zone, with considerably less relief, but where the anomalies present several major directions. Several of these anomalies have been interpreted by three different methods with the intention of determining the depth of the sources of disturbance and of specifying possible relationships between these sources and the structural geology of the Armorican plateau. From the south to the north of the region studied, the floor of the continental plateau appears to be divided into compartments by large SW-NE horst and graben structures of Hercynian age. In each compartment the depth to basement increases from east to west by step-faulting with a NW-SE orientation, such faulting has played a role throughout the geological history of the continental plateau. Finally, it emerges from this study that the magnetic anomalies are, for the most part, related to the major structural and tectonic lines of the metamorphic basement visible at ground level. Several areas of high positive anomaly may be associated with basic intrusions emplaced along the lines of major faults in the basement rocks of the Armorican platform.

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