33 research outputs found
Basin tectonic history and paleo-physiography of the pelagian platform, northern Tunisia, using vitrinite reflectance data
Constraining the thermal, burial and uplift/exhumation history of sedimentary basins is crucial in the understanding of upper crustal strain evolution and also has implications for understanding the nature and timing of hydrocarbon maturation and migration. In this study, we use Vitrinite Reflectance (VR) data to elucidate the paleoâphysiography and thermal history of an inverted basin in the foreland of the Atlasic orogeny in Northern Tunisia. In doing so, it is the primary aim of this study to demonstrate how VR techniques may be applied to unravel basin subsidence/uplift history of structural domains and provide valuable insights into the kinematic evolution of sedimentary basins. VR measurements of both the onshore Pelagian Platform and the Tunisian Furrow in Northern Tunisia are used to impose constraints on the deformation history of a longâlived structural feature in the studied region, namely the Zaghouan Fault. Previous work has shown that this fault was active as an extensional structure in Lower Jurassic to Aptian times, before subsequently being inverted during the Late Cretaceous Eocene Atlas I tectonic event and Upper Miocene Atlas II tectonic event. Quantifying and constraining this latter inversion stage, and shedding light on the roles of structural inheritance and the basin thermal history, are secondary aims of this study. The results of this study show that the Atlas II WNWâESE compressive event deformed both the Pelagian Platform and the Tunisian Furrow during TortonianâMessinian times. Maximum burial depth for the Pelagian Platform was reached during the Middle to Upper Miocene, i.e. prior to the Atlas II folding event. VR measurements indicate that the Cretaceous to Ypresian section of the Pelagian Platform was buried to a maximum burial depth of ~3 km, using a geothermal gradient of 30°C/km. Cretaceous rock samples VR values show that the hanging wall of the Zaghouan Fault was buried to a maximum depth of <2 km. This suggests that a vertical kmâscale throw along the Zaghouan Fault preâdated the Atlas II shortening, and also proves that the fault controlled the subsidence of the Pelagian Platform during the OligoâMiocene. Mean exhumation rates of the Pelagian Platform throughout the Messinian to Quaternary were in the order of 0.3 mm/year. However, when the additional effect of TortonianâMessinian folding is accounted for, exhumation rates could have reached 0.6-0.7 mm/year
Transplantation foieârein combinĂ©e : indications et rĂ©sultats. [Combined liver-kidney transplantation: Indications and results.]
PURPOSE: The purpose of this article is to report our experience concerning the indications and results for combined liver-kidney transplantation in our centre. MATERIAL AND METHOD: From July 1991 to October 2006, 26 patients underwent combined liver-kidney transplantation in our establishment. This group comprised 16 men and 10 women with a mean age of 50.1 years (range: 19 to 68 years). The main indications were as follows: hepatorenal polycystic disease, type I hyperoxaluria, cirrhosis associated with end-stage renal failure. RESULT: The median follow-up was 62.73 (+/-50.9) months. Only two patients of this series died, one at 70 months from gastric cancer, and the other at 89 months from cerebral metastases. Nine patients developed surgical complications (29%). Liver function was normal in the 24 surviving patients. Only one case of loss of renal graft was observed at 12 years and this patient is currently on dialysis. The mean creatinine level in these patients (apart from the dialysed patient) at the last follow-up visit was 120.3 (+/-30.43)mumol/l. CONCLUSION: Combined liver-kidney transplantation can be performed with acceptable morbidity and mortality and excellent long-term results
AGE AS ONLY PREDICTIVE FACTOR FOR SUCCESSFUL SPERM RECOVERY IN PATIENTS WITH KLINEFELTER'S SYNDROME
Hydrothermal synthesis and luminescence properties of nanospherical SiO 2 @LaPO 4 :Eu 3+ (5%) composite
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