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<title lang=en>SEDIMENT BUDGETS IN CATCHMENT–ALLUVIAL FAN SYSTEMS OF THENORTHERN TIAN SHAN (CHINA): IMPLICATIONS FOR MASS-BALANCEESTIMATES, DENUDATION AND SEDIMENTATION 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>National audience</description>
<source>Association des Sédimentologistes Français. 15ème congrès français de sédimentologie</source>
<coverage>Chambéry, France</coverage>
<contributor>Association des Sédimentologistes Français</contributor>
<identifier>hal-01252100</identifier>
<identifier>https://hal.archives-ouvertes.fr/hal-01252100</identifier>
<source>https://hal.archives-ouvertes.fr/hal-01252100</source>
<source>Association des Sédimentologistes Français. 15ème congrès français de sédimentologie, Oct 2015, Chambéry, France. pp.56, 2015, ASF 2015</source>
<language>en</language>
<subject>[SDU.STU] Sciences of the Universe [physics]/Earth Sciences</subject>
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<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–alluvial fansystems in the northern Tian Shan Range and its foreland basin to discuss some ideas about sedimentproduction, storage, release, and bypass in relatively short (100 km long) sediment routing systems.Based on a geometrical reconstruction of the fans, we estimated the volumes of sediments exportedout of the range and deposited in its alluvial piedmont during the Middle- Late Pleistocene andthe Holocene. This work shows that the two areas clearly present evidence of a temporary butsignificant storage of sediments during the Pleistocene. These sediments were then excavated anddelivered farther into the foreland basin during the Holocene. The difference between the volumesof materials released from the range and piedmont areas and the volume stored in thecontemporaneous fans downstream indicates that the latter did not trap the whole sediment loadtransported by the rivers. The alluvial fans were bypassed by 27 to 78% of this load toward thedownstream alluvial plain. It implies a major volumetric partitioning of the deposits between thefans and the alluvial plain, with a sedimentation rate about twenty times higher in the fans thanin the plain. However, this volumetric partitioning might only occur during periods with a veryspecific hydrological regime such as the Holocene deglaciation. Eventually, the peculiar sedimentstorage and release pattern within the range and piedmont areas during the Pleistocene and Holocenecomplicates the calculation of mean paleodenudation rates using either sediment budgets or in situproduced cosmogenic nuclides.</description>
<date>2015-10-13</date>
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