Letteratura scientifica selezionata sul tema "Sud-Est du Tibet"
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Articoli di riviste sul tema "Sud-Est du Tibet":
Guillot, Stéphane, Stéphane Pochat, Nathalie Zakarian e K. V. Hodges. "Evolution métamorphique du dôme de Kangmar (Sud-Est-Xizang, Tibet): Implications pour les zones internes himalayennes". Comptes Rendus de l'Académie des Sciences - Series IIA - Earth and Planetary Science 327, n. 9 (novembre 1998): 577–82. http://dx.doi.org/10.1016/s1251-8050(99)80110-4.
Pan, Yihong. "Locating Advantages". T’oung Pao 99, n. 4-5 (2013): 268–300. http://dx.doi.org/10.1163/15685322-9945p0002.
Tesi sul tema "Sud-Est du Tibet":
Gourbet, Loraine. "Évolution morphologique et sédimentologique des bordures ouest et sud-est du plateau du Tibet". Thesis, Lyon, École normale supérieure, 2015. http://www.theses.fr/2015ENSL0982/document.
Tibet is the widest and highest plateau on Earth. Tectonics, climate evolution and ante-surrection geomorphology are the main factors controlling the plateau formation. In order to assess the relative influence of these factors, we study the relief evolution on the plateau edges using geomorphic analysis, sedimentology and exhumation rates based on low-temperature thermochronometry.The results show that the western and eastern plateau edges were already at high elevation at ca 35 Ma, only 20 Ma after the India-Asia collision. This favors an “en bloc” uplift model for the plateau.In western Tibet, the hydrographic network was connected to the Indus river, allowing the early development of a >1000 m amplitude relief, probably before 35 Ma. The relief was preserved due to low erosion conditions. Western Tibet was then isolated from the Indus drainage network due to the Karakorum fault slip.The relief formation in Eastern Tibet is older than in western Tibet: at ca 35 Ma, in the Jianchuan area (northern Yunnan), which was already at high elevation, was a large braided river system. This implies a moderate regional slope. It also implies a local relief further north and significant precipitations
Ruan, Xiaobai. "Géochimie des rivières du bassin de Chayu (Sud-est du Tibet) et altération du batholithe du Trans-Himalaya". Electronic Thesis or Diss., Université de Lorraine, 2023. http://www.theses.fr/2023LORR0053.
This thesis aims to understand better why and how the climate cooling, CO₂ drawdown and the marine Sr isotopic ratio increase all happened during Eocene/Oligocene. I checked the possibility of Trans-Himalaya weathering as the candidate for explaining the early change in marine ⁸⁷Sr/⁸⁶Sr and atmospheric CO₂ during Eocene/Oligocene, by studying the modern chemical weathering of the Trans-Himalaya batholith under monsoon climate. We choose the Chayu River Catchment locating in the SE Tibet as the study area for three reasons: 1) this catchment is mostly covered by the granitoid rocks of the Trans-Himalaya batholith, 2) it is now under the monsoon climate and 3) it is experiencing intense tectonic activity. Besides, the alpine part of the catchment is under periglacial environment, and there is a lack of knowledge about alpine periglacial weathering especially in active mountain ranges. Combining the above, we set two objects of the thesis: first, to study the periglacial weathering process in active alpine mountain of the Chayu Catchment, and second to study the weathering budget and the ⁸⁷Sr/⁸⁶Sr ratios of the catchment, in order to figure out the atmospheric CO₂ sinks and sources, the climatic dependency of chemical weathering rates and the Sr systematics of the Chayu Catchment. Samplings for the main river, tributaries and seepages of mass wasting deposits were conducted at the end of monsoon season in 2019. To study the alpine periglacial weathering processes, we compared the seepages from mass wasting deposits generated by freeze-thaw processes under periglacial environment and landslide under monsoon climate, and the nearby streams of these two climatic conditions. The landslide seepages under monsoon climate are more concentrated than nearby streams, and the seepages under periglacial environment are as concentrated as the landslide seepages but exhibit negligible differences than nearby streams. Our analyses on elemental ratios indicate that the freeze-thaw process provide an exposure mechanism similar to landslide to facilitate the weathering of reactive mineral phases of calcite, biotite and sulphide. The similarity between periglacial seepages and streams may indicate the widespread periglacial mass wasting deposits has a decisive influence on the river chemistry in alpine periglacial areas. To discuss the weathering budgets of the Chayu River Catchment, we first identified and corrected the river composition for the influences of secondary calcite precipitation (SCP). It is found that the weathering budget is dominated by carbonate weathering even though the lithology is mostly granitoid, and the degree of SCP is higher in the periglacial North Chayu than in the South Chayu, and is closely related to the carbonate weathering contribution. The δ¹³CDIC and sulphate proportion together tell that the chemical weathering of the Chayu catchment is mostly driven by carbonic acid, although sulphuric acid weathering is widespread. Combining the budgets of substrates and acids, the chemical weathering of the modern Chayu River Catchment is a CO₂ source rather than a CO₂ sink. After estimating the relative discharge of each tributary by δ¹⁸O of the river water, the carbonate and silicate weathering rates in each tributary basin are calculated. The carbonate weathering rates are basically irrelevant to climatic factors while the silicate weathering rates are positive correlated with basin MAT and runoff. The ⁸⁷Sr/⁸⁶Sr ratios of the main river is around 0.735, suggesting the impact from radiogenic carbonate. Combining the results, the silicate weathering of Trans-Himalaya might be more important than today during Eocene/Oligocene with warmer and wetter climate, and it is also possible that the weathering at that time was thus reversed to a CO₂ sink. The radiogenic Sr signals of the Chayu River suggest the weathering of Trans-Himalaya was capable of rising the marine ⁸⁷Sr/⁸⁶Sr before Himalayan exhumation
Billerot, Audrey. "De la marge Ouest du craton du Yangtze à la bordure Est du plateau Tibétain : évolution géodynamique à partir de l'étude structurale, pétrologique, géochimique et géochronologique de roches magmatiques et métamorphiques". Thesis, Nancy 1, 2011. http://www.theses.fr/2011NAN10025/document.
The present geometry of the Eastern Tibetan plateau, made of the Songpan Ganze terrane and the Longmen Shan range, is probably due to a rheological contrast between the Yangtze craton to the East, and the Songpan Ganze, which bump into the craton margin in response to the India-Asia collision. We reconstituted the geodynamic evolution of the area from Neoproterozoic times to present to evaluate how the different orogenic cycles influence the thermal, mineralogical and chemical structures observed today. Studies of the crystalline massifs of the western margin of the Yangtze craton and of the San Dao Qiao ophiolite show that during the Neoproterozoïc times, the craton margin was a subduction zone with opening of marginal basin due to mantle plumes. Petrologic and structural studies of the Danba metamorphic complex allow determining that during the Indosinian orogeny (200-180 Ma), exhumation mechanism of the deep structural level of the complex is an extrusion along a ductile thrust. Plutons position relative to sutures zones in the Tibetan plateau lead to a model of double slab roll-back under the Songpan Ganze at the end of the Indosinian orogeny which explain the diversity of the granites. The double slab roll-back and the difference in deformation between the Songpan Ganze and the Yangtze craton lead to a slab tear along the craton margin. The complete delamination of the lithospheric mantle under the Songpan Ganze terrane can explain the present juxtaposition of a thick crust and thin mantle lithosphere against a cratonized one
Libri sul tema "Sud-Est du Tibet":
(Firm), Drouot-Richelieu. Extrême-Orient: Collection de Mr. X, bel ensemble de sculptures sur Pierre de l'Inde et du Sud-est asiatique, Thaïlande, Laos, Birmanie, Khmer, bronze du Népal et du Tibet - peintures et Thangka. Paris: Boisgirard & Associés, 2002.
Eric, Buffetaut, Jaeger Jean-Jacques, Rage Jean-Claude, Société géologique de France e Centre national de la recherche scientifique (France), a cura di. Paléogéographie de l'Inde, du Tibet et du sud-est asiatique: Confrontation des données paléontologiques avec les modèles géodynamiques : table ronde, Société géologique de France et Centre national de la recherche scientifique, Paris, les 17-20 octobre 1983. Paris: La Société géologique, 1985.
Hotel Drouot. Extrěme-orient, Tibet, Népal, Inde, Asie du Sud-Est, Philippines, Chine, Japon, Indonésie, těte de pseudo-momie osirienne. Paris, 1999.
Capitoli di libri sul tema "Sud-Est du Tibet":
AFONSO, Eve, Cécile CALLOU, Céline CLAUZEL, Patrick GIRAUDOUX e Li LI. "Conservation du rhinopithèque de Biet". In Socio-écosystèmes, 225–58. ISTE Group, 2022. http://dx.doi.org/10.51926/iste.9052.ch6.