The Himalayan crystalline core zone exposed along the Sutlej Valley (India) is composed of two high‐grade metamorphic gneiss sheets that were successively underthrusted and tectonically extruded, as a consequence foreland‐directed propagation crustal deformation in Indian plate margin. High Crystalline Sequence (HHCS) amphibolite facies to migmatitic paragneisses, metamorphosed at temperatures up 750°C 30 km depth between Eocene early Miocene. During Miocene, combined thrusting Main Central...

A zircon fission track-annealing model is calculated on the basis of annealing experiments from literature with induced tracks in α-decay event damage-free samples. Empirically derived parallel and fanning equations for this "zero-damage" yield an excellent fit to data, providing slightly better statistical parameters. comparison between models iso-annealing lines but different damage densities reveals that temperatures closure estimated partial zone are highest zero-damage model.

Abstract The chemical and structural alteration of metamict zircon crystals from a 619 ±17 (2σ) Ma old, posttectonic granite in the southern part Eastern Desert, Egypt was studied. show simple oscillatory growth zones with metamictization–induced fractures, which provided pathways for fluid infiltration. Electron ion microprobe analyses reveal that metamict, i.e. U Th–rich, areas are heavily enriched Ca, Al, Fe, Mn, LREE , water species, have lost Zr Si as well radiogenic Pb. These changes...

Research Article| August 01, 2004 Climate-induced rebound and exhumation of the European Alps Charlotte E. Cederbom; Cederbom 1CRUST Consortium, School GeoSciences, University Edinburgh, Edinburgh EH9 3JW, UK Search for other works by this author on: GSW Google Scholar Hugh D. Sinclair; Sinclair Fritz Schlunegger; Schlunegger 2Geological Institute, Bern, Baltzerstrasse 1, CH-3012 Switzerland Meinert K. Rahn 3Swiss Federal Nuclear Safety Inspectorate, 5232 Villigen-HSK, Author Article...

Research Article| January 01, 2009 Metamorphic rates in collisional orogeny from situ allanite and monazite dating Emilie Janots; Janots 1Institut für Geologie, Universität Bern, Blatzerstrasse 3, CH-3012 Switzerland *Current address: Institut Mineralogie, WWU Münster, Corrensstrasse 24, 48149 Germany Search for other works by this author on: GSW Google Scholar Martin Engi; Engi Daniela Rubatto; Rubatto 2Research School of Earth Sciences, The Australian National University, Canberra ACT...

Abstract The Zermatt‐Saas serpentinite complex is an integral member of the Penninic ophiolites Central Alps and represents mantle part oceanic lithosphere Tethys. Metamorphic textures preserve mineralogical evolution from primary abyssal peridotite through ocean‐floor hydration, subduction‐related high‐pressure overprint, meso‐Alpine greenschist facies metamorphism, late‐stage hydrothermal alteration. early ocean floor hydration spinel harzburgites still visible in relic pseudomorphic...

The evolution of the Central Alpine deformation front (Subalpine Molasse) and its undeformed foreland is recently debated because their role for deciphering late orogenic Alps. Its latest exhumation history poorly understood due to lack Miocene Pliocene sediments. We constrain this transitional zone with apatite fission track (U‐Th)/He data. used laser ablation inductively coupled mass spectrometry dating compare method previously published unpublished external detector Two investigated...

Quantifying long‐term exhumation rates is a prerequisite for understanding the geodynamic evolution of orogens and their exogenic endogenic driving forces. Here we reconstruct history central Aar Gotthard external crystalline massifs in European Alps using apatite zircon fission track (U‐Th)/He data. Age‐elevation relationships time‐temperature paths derived from thermal modeling are interpreted to reflect nearly constant ∼0.5 km/Ma since ∼14 Ma. A slightly accelerated rate (∼0.7 km/Ma)...

Abstract In this study, we use isochron‐burial dating to date the Swiss Deckenschotter, oldest Quaternary deposits of northern Alpine Foreland. Concentrations cosmogenic 10 Be and 26 Al in individual clasts from a single stratigraphic horizon can be used calculate an age based on assumed initial ratio measured Al/ ratio. We suggest that, owing deep repeated glacial erosion, isochron landscapes at time burial varies between 6.75 8.4. Analysis 22 different lithology, shape, size one 0.5 m...

Carbonate deformation through the brittle-ductile transition (BDT) remains incompletely documented in field. We therefore investigate exhumation of SW-Helvetic nappe stack using a new multi-method approach that integrates optical observations with revised nomenclature, thermochronology, stable isotopes, and clumped isotope thermometry, aiming to constrain time-temperature history BDT processes carbonates. Single grain (U–Th)/He zircon apatite fission track ages establish burial/exhumation...

Abstract Three types of rodingites can be distinguished in the serpentinite complex Zermatt-Saas ophiolites based on mineral assemblages, texture, and chemical characteristics bulk-rock compositions. These three show a genetic relationship basis their evolution. The assemblage Czo-Hgrs-Chl-Di ± Uvr (rodingite I) was developed during ocean-floor metamorphism represents earliest rodingitic rock. A second phase oceanic alteration is characterized by formation andradite-rich hydrogarnet....

The phonolitic Limberg t3 tephra (Kaiserstuhl Volcanic Complex, Germany) was previously dated by the conventional K/Ar method yielding inconsistent results. We have re-dated this layer with three independent methods. Fission Track (FT) external detector analyses on single apatite crystals (16.8 ± 1.3 Ma, 2s) and (U-Th)/He measurements titanite (16.5 1.0 2s 16.8 2s, respectively) are in close agreement laser Ar/Ar dates incrementally heated of sanidine (16.3 0.4 2s). Due to very rapid...

Abstract Eclogite facies metarodingites occur as deformed dykes in serpentinites of the Zermatt‐Saas ophiolite (Western Alps). They formed during subduction Tethys oceanic lithosphere Early Tertiary. The developed a consequence serpentinization mantle. Three major types (R1, R2 & R3) can be distinguished on basis their mineralogical composition. All contain vesuvianite, chlorite and hydrogrossular high modal amounts. In addition they contain: R1 – diopside, tremolite, clinozoisite,...

We examine the hypothesis that Pliocene exhumation of external massifs in central Alps is controlled by climatic change. New thermochronological data from western Gastern‐Aar massif are used to investigate timing, extent, and reasons for Neogene exhumation. Our reveal was constant with 0.5 km/Ma over last 10 Ma north. In southern part, same order until ∼3.5 but then increased gradually toward south values up 1.2 km/Ma, resulting overall northward tilting Aar massif. explain this accelerated...

The contribution of climate and tectonics to the Neogene exhumation history European Alps is studied in Mont Blanc (MB) massif using low‐temperature thermochronology. Apatite fission track (U‐Th‐[Sm])/He data suggest that MB was exhumed episodically: Rapid (2.5 ± 0.5 km/Ma) before 6 Ma followed by an episode slow a period accelerated (>1 after ∼3 Ma. Comparing rates with reported all other external crystalline massifs (ECM) shows only ECM experienced rapid Ma, which possibly related NW...

ABSTRACT Detailed textural and chemical data for mineral assemblages on a regional scale are presented the metaandesitic Eocene‐Oligocene Taveyanne greywacke of Glarus Alps, Eastern Switzerland. Presented indicate an increase metamorphic grade from zeolite facies to prehnite‐pumpellyite pumpellyite‐actinolite facies. Low‐grade outcrops contain laumontite, minor corrensite pumpellyite (assemblage type 1), whereas higher prehnite two populations (type 2), prehnite—pumpellyite‐(Al)—white mica...

Abstract The northern Swiss Alpine Foreland exemplifies a highly transient landscape characterized by multiple knickzones along the trunk valleys and distinct bedrock straths at their junction with tributary valleys. This has evolved as result of fast base level changes in response to repeated glaciations during Quaternary. As archives related evolution this are scarce, available quantitative information is limited, especially for early middle Pleistocene. In order track pace Pleistocene,...