Dataset Information

Alps to Apennines zircon roller coaster along the Adria microplate margin.

ABSTRACT: We have traced the particle path of high-pressure metasedimentary rocks on Elba Island, Northern Apennines, with the help of a U-Pb-Hf detrital zircon study. One quarter of the analysed zircons are surprisingly young, 41-30?Ma, with a main age peak at ca. 32?Ma, indicating an unexpected early Oligocene maximum deposition age. These Oligocene ages with negative ?Hf indicate a volcanic source region in the central-southern Alps. Though young by geological means, these zircons record an extraordinary geodynamic history. They originated in a volcanic arc, during the convergence/collision of the the Adria microplate with Europe from ca. 65 to 30?Ma. Thereafter, the Oligocene zircons travelled ca. 400?km southward along the Adria margin and the accretionary prism to present-day Tuscany, where they were subducted to depths of at least 40?km. Shortly thereafter, they were brought to the surface again in the wake of hinge roll back of the Apennine subduction zone and the resulting rapid extensional exhumation. Such a zircon roller coaster requires a microplate that has back-to-back subduction zones with opposing polarities on two sides.

SUBMITTER: Jacobs J

PROVIDER: S-EPMC5807382 | biostudies-literature | 2018 Feb

REPOSITORIES: biostudies-literature

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Alps to Apennines zircon roller coaster along the Adria microplate margin.

Jacobs J J Paoli G G Rocchi S S Ksienzyk A K AK Sirevaag H H Elburg M A MA

Scientific reports 20180209 1

We have traced the particle path of high-pressure metasedimentary rocks on Elba Island, Northern Apennines, with the help of a U-Pb-Hf detrital zircon study. One quarter of the analysed zircons are surprisingly young, 41-30 Ma, with a main age peak at ca. 32 Ma, indicating an unexpected early Oligocene maximum deposition age. These Oligocene ages with negative εHf indicate a volcanic source region in the central-southern Alps. Though young by geological means, these zircons record an extraordina ...[more]

PMID: 29426906

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Project description:AimTo explore how persons living with liver cirrhosis experience day-to-day life.BackgroundLiver cirrhosis is the sixth most common cause of death among adults in Western countries. Persons with advanced liver cirrhosis report poor quality of life, in comparison with other chronic diseases. However, knowledge regarding day-to-day life during earlier stages of the disease is lacking. In other chronic diseases, the suffering process is well explored, while in liver cirrhosis, suffering is insufficiently investigated.DesignAn exploratory study, with a qualitative inductive interview approach.MethodsA purposive maximum variation sample of 20 informants with liver cirrhosis aged 25-71, from two gastroenterology outpatient clinics in mid-Sweden, were interviewed from September 2016 to October 2017. Interview data were analysed inductively with qualitative content analysis. Reporting followed the COREQ guidelines.ResultsThe experiences of day-to-day life living with liver cirrhosis comprised four sub-themes. Living with liver cirrhosis implied varying levels of deterioration, the most apparent being exhaustion or tiredness. The informants had to find ways of adapting to a new life situation. The insecurity of future health evoked existential reflections such as feeling emotionally and existentially distressed. Shame and guilt were reasons for feeling stigmatised. These sub-themes emerged into one overarching theme of meaning: life turns into an unpredictable roller coaster. This is based on experiences of liver cirrhosis as an unpredictable disease with fluctuating symptoms, worries and disease progression.ConclusionLiving with cirrhosis implies an unpredictable condition with a progressive, stigmatising disease. The fluctuating symptoms and deep concerns about future life pose an increased personal suffering.Relevance to clinical practiceWithin health care, knowledge of the person's experience is vital to enable and fulfil the person's healthcare needs. Clinical registered nurses need a person-centred approach to strengthen their patients to cope with their new life situation.

Project description:The transition zone of the Eastern Alps to the Pannonian Basin provides one of the best sources of information on landscape evolution of the Eastern Alpine mountain range. The region was non-glaciated during the entire Pleistocene. Thus, direct influence of glacial carving as a landscape forming process can be excluded and relics of landforms are preserved that date back to at least the Late Neogene. In this study, we provide a correlation between various planation surfaces across the orogen-basin transition. In particular, we use stream terraces, planation surfaces and cave levels that cover a vertical spread of some 700 m. Our correlation is used to show that both sides of the transition zone uplifted together starting at least about 5 Ma ago. For our correlation we use recently published terrestrial cosmogenic nuclide (TCN) burial ages from cave sediments, new optically stimulated luminescence (OSL) ages of a stream terrace and U-Th ages from speleothems. Minimum age constraints of cave levels from burial ages of cave sediments covering the last ~ 4 Ma are used to place age constraints on surface features by parallelizing cave levels with planation surfaces. The OSL results for the top section of the type locality of the Helfbrunn terrace suggest an Early Würm development (80.5 ± 3.7 to 68.7 ± 4.0 ka). The terrace origin as a penultimate gravel deposit (in classical Alpine terminology Riss) is therefore questioned. U-series speleothem ages from caves nearby indicate formation during Marine Isotope Stages (MIS) 5c and 5a which are both interstadial warm periods. As OSL ages from the terrace also show a time of deposition during MIS 5a ending at the MIS 5/4 transition, this supports the idea of temperate climatic conditions at the time of deposition. In general, tectonic activity is interpreted to be the main driving force for the formation and evolution of these landforms, whilst climate change is suggested to be of minor importance. Obvious hiatuses in Miocene to Pleistocene sediments are related to ongoing erosion and re-excavation of an uplifting and rejuvenating landscape.

Dataset Information

Alps to Apennines zircon roller coaster along the Adria microplate margin.

Publications

Alps to Apennines zircon roller coaster along the Adria microplate margin.

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