Research Article| November 01, 2016 Middle to late Eocene exhumation of the Greater Himalayan Sequence in Central Himalayas: Progressive accretion from Indian plate Rodolfo Carosi; Carosi 1Dipartimento di Scienze della Terra, Università Torino, 10125 Italy †rodolfo.carosi@unito.it; iaccarinosalvatore@gmail.com; h-j.massonne@imi.uni-stuttgart.de; daniela.rubatto@geo.unibe.ch; langone@crystal.unipv.it; l.gemignani@vu.nl; dario.visona@unipd.it. Search for other works by this author on: GSW...

Abstract The Himalayan syntaxes, characterized by extreme rates of rock exhumation co-located with major trans-orogenic rivers, figure prominently in the debate on tectonic versus erosional forcing exhumation. Both mechanism and timing rapid Namche Barwa massif eastern syntaxis remain controversial. It has been argued that coupling between crustal advection surface erosion initiated late Miocene (8–10 Ma). Recent studies, contrast, suggest a Quaternary onset linked to purely mechanism. We...

The Mugello Basin is a WNW-ESE-striking, seismically active intermontane basin currently experiencing post-orogenic extension that affects the hinterland of Northern Apennines belt (Italy). It lies near main watershed Apennines, feature traditionally seen as separating internal, extension-dominated (to southwest) part from external, contractional northeast) part. Therefore, complex and controversial relationships exist between recorded seismic activity surface manifestations potentially...

Abstract The Bengal Fan provides a Neogene record of Eastern and Central Himalaya exhumation. We provide the first detrital thermochronological study (apatite rutile U-Pb, mica Ar-Ar, zircon fission track) sediment samples collected during International Ocean Discovery Program (IODP) Expedition 354 to mid–Bengal Fan. Our data from fission-track thermochronometry show shift in lag times over interval 5.59–3.47 Ma. oldest sample with time <1 m.y. has depositional age between 3.76 3.47 Ma,...

The Namche Barwa massif in the eastern Himalayan syntaxis is characterized by very rapid exhumation and provides a significant proportion of sediment flux carried Brahmaputra River. We present new detrital zircon fission-track (ZFT) muscovite 40Ar/39Ar (MAr) data from modern sediments rivers draining Himalaya. cooling-age populations for both thermochronometers contain characteristic <2 Ma signature related to Barwa, which can be traced hundreds kilometers downstream their source into...

The junction of the Dinaric and Hellenic mountain belts hosts a trans-orogenic normal fault system (Shkoder-Peja Normal Fault, SPNF) that has accommodated oroclinal bending, as well focused basin formation drainage Drin River catchment. Analysis fluvial morphology this catchment reveals higher values river slope indices ( k sn ) χ (Chi) between faults SPNF divide. divide is predicted to be migrating away from SPNF, except at NE end system. Two basins analysed in hangingwall Western Kosovo...

The Hindu Kush–Kohistan–Karakoram region is critical to understanding the long-term accretion history of south Asian margin pre- and post-India–Asia collision impact these collisions on development high topography. However, knowledge about this remains incomplete owing sparse studies. Here, we present a study comprising detrital zircon U–Pb geochronology, muscovite 40 Ar/ 39 Ar thermochronology numerical modelling dates. identifies age peaks at 200, 110–130, 60–80 28–40 Ma, supporting...

Abstract. One of the main purposes detrital thermochronology is to provide constraints on regional-scale exhumation rate and its spatial variability in actively eroding mountain ranges. Procedures that use cooling age distributions coupled with hypsometry thermal models have been developed order extract quantitative estimates erosion distribution, assuming steady state between tectonic uplift erosion. This hypothesis precludes these procedures assess likely transient response belts changes...

The Indo-Asia collision significantly changed the topography and drainage network of rivers around Tibetan Plateau. Debate continues as to when how current system Yangtze River was formed. Here we use 40 Ar/ 39 Ar dating detrital micas (muscovite biotite) constrain provenances Pliocene sediments from Jianchuan Yuanmou basins in SE Tibet. Muscovite biotite data same samples Basin suggest contrasting distal v. local sources, respectively. Similarly, muscovite a derivation Yalong River, but...

Abstract Detrital thermochronology can be used as a tool to quantitatively constrain exhumation rates and its spatial variability from active mountain belts. Commonly methods for this purpose assume steady state relationship between tectonic uplift erosion. However, assumption does not account the transitory response of dynamic orogenic system changes in boundary conditions. We propose different approach that uses observed detrital age distributions “markers” past present‐day erosion mixing...

Abstract The Dinaric–Hellenic mountain belt bends where two fault systems transect the orogen: (1) dextral Shkoder-Peja Transfer Zone (SPTZ), active sometime between Late Cretaceous and middle Eocene; (2) Normal Fault (SPNF), which accommodated NW–SE directed orogen-parallel extension. SPTZ dextrally offsets nappes by ~ 75 km, a displacement attributed to reactivation of an Early Mesozoic rift transfer zone in Adriatic margin during Paleogene subduction Pindos Ocean. This involved initial...

The Cenozoic uplift evolution of the Western Alps has been examined from various perspectives. Several studies have suggested that a Late Miocene-Pliocene European slab break-off, coupled with increased erosion due to enhanced glaciation, serves as driving factor controlling topography. Alternatively, strain partitioning resulting Adriatic indentation and Oligocene clockwise rotation leads contrasting kinematic regimes, segmenting into blocks differential exhumation. Here, we analyze Dent...

Based on new zircon and apatite (U-Th-Sm)/He 40Ar/39Ar ages, along with published thermochronometric data, we derive first-order constraints the tectonic thermal evolution of Dent Blanche Tectonic System (DBTS), an Austroalpine nappe in Western Alps underlain by former Ligure-Piemontese oceanic units. Overall, ZHe ages are approximately 30 Ma, most AHe younger, ranging from ~20 to ~12 exceptionally young (~2.5 Ma) a sample collected at lower elevation Valpelline Valley. MAr scattered,...

The potential role of tectonic and climatic change as mechanisms governing the Late Cenozoic topographic evolution Western Alps has been strongly debated. There, Neogene climate cooling effect expressed through glacial erosion sediment mobilization interpreted to produce high rates isostatically-driven rock uplift. However, these inference remains challenging test, data confirming this relationship are spatially confined. Furthermore, glacially-driven at elevation, compared landscape in...

Abstract For sedimentary archives to be used as a record of hinterland evolution, the factors affecting archive must known. In addition tectonics, number factors, such changes in climate and paleodrainage, well degree diagenesis, influence basin sediments. The Indus River delta-fan system South-Central Asia records history Himalayan both onshore offshore repositories have been studied extensively research orogenesis. However, unknowns remain regarding this system. This paper seeks elucidate...