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<title lang=en>SEDIMENT BUDGETS IN CATCHMENT–ALLUVIAL FAN SYSTEMSOF THE NORTHERN TIAN SHAN (CHINA):IMPLICATIONS FOR MASS-BALANCE ESTIMATES, DENUDATION ANDSEDIMENTATION RATES IN OROGENIC SYSTEMS</title>
<creator>Barrier, Laurie</creator>
<creator>Guerit, Laure</creator>
<creator>Jolivet, Marc</creator>
<creator>Dominguez, Stephane</creator>
<creator>Métivier, François</creator>
<creator>Fu, Bihong</creator>
<contributor>Institut de Physique du Globe de Paris (IPGP) ; Université Pierre et Marie Curie - Paris 6 (UPMC) - Institut national des sciences de l'Univers (INSU - CNRS) - IPG PARIS - Université Paris Diderot - Paris 7 (UPD7) - Université de la Réunion (UR) - Centre National de la Recherche Scientifique (CNRS)</contributor>
<contributor>Géosciences Rennes (GR) ; Université de Rennes 1 (UR1) - Institut national des sciences de l'Univers (INSU - CNRS) - Observatoire des Sciences de l'Univers de Rennes (OSUR) - Centre National de la Recherche Scientifique (CNRS)</contributor>
<contributor>Géosciences Montpellier ; Université des Antilles et de la Guyane (UAG) - Institut national des sciences de l'Univers (INSU - CNRS) - Université de Montpellier (UM) - Centre National de la Recherche Scientifique (CNRS)</contributor>
<contributor>State Key Laboratory of Lithospheric Evolution ; Institute of Geology and Geophysics, Chinese Academy of Sciences</contributor>
<description>International audience</description>
<source>Source to Sink: a long term perspective of sediment budgets and sources characterization, Abstracts</source>
<source>Source to Sink: a long term perspective of sediment budgets and sources characterization</source>
<coverage>Rennes, France</coverage>
<contributor>Géosciences-Rennes</contributor>
<identifier>insu-01406440</identifier>
<identifier>https://hal-insu.archives-ouvertes.fr/insu-01406440</identifier>
<source>https://hal-insu.archives-ouvertes.fr/insu-01406440</source>
<source>Source to Sink: a long term perspective of sediment budgets and sources characterization, Nov 2016, Rennes, France. Source to Sink: a long term perspective of sediment budgets and sources characterization, Abstracts, pp.37, 2016</source>
<language>en</language>
<subject>[SDU.STU.ST] Sciences of the Universe [physics]/Earth Sciences/Stratigraphy</subject>
<subject>[SDU.STU.GM] Sciences of the Universe [physics]/Earth Sciences/Geomorphology</subject>
<type>info:eu-repo/semantics/conferenceObject</type>
<type>Conference papers</type>
<description lang=en>Mass balances are often used to calculate sediment fluxes in sedimentary basins and denudationrates in adjacent topographies on intermediate to long timescales (from a few tens ofthousand to a million years). In this study, we focus on simple Quaternary catchment–alluvialfan systems in the northern Tian Shan Range and its foreland basin to discuss some ideasabout sediment production, storage, release, and bypass in relatively short (100 km long) sedimentrouting systems. Based on a geometrical reconstruction of the fans, we estimated thevolumes of sediments exported out of the range and deposited in its alluvial piedmont duringthe Middle-Late Pleistocene and the Holocene. This work shows that the two areas clearlypresent evidence of a temporary but significant storage of sediments during the Pleistocene.These sediments were then excavated and delivered farther into the foreland basin during theHolocene. The difference between the volumes of materials released from the range and piedmontareas and the volume stored in the contemporaneous fans downstream indicates thatthe latter did not trap the whole sediment load transported by the rivers. The alluvial fans werebypassed by 27 to 78% of this load toward the downstream alluvial plain. It implies a majorvolumetric partitioning of the deposits between the fans and the alluvial plain, with a sedimentationrate about twenty times higher in the fans than in the plain. However, this volumetricpartitioning might only occur during periods with a very specific hydrological regime suchas the Holocene deglaciation. Eventually, the peculiar sediment storage and release patternwithin the range and piedmont areas during the Pleistocene and Holocene complicates thecalculation of mean paleodenudation rates using either sediment budgets or in situ producedcosmogenic nuclides.</description>
<date>2016-11-30</date>
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