dc.contributor.author
Mandal, Sanjay Kumar
dc.contributor.author
Scherler, Dirk
dc.contributor.author
Wittmann, Hella
dc.date.accessioned
2021-12-06T13:00:52Z
dc.date.available
2021-12-06T13:00:52Z
dc.identifier.uri
https://refubium.fu-berlin.de/handle/fub188/33019
dc.identifier.uri
http://dx.doi.org/10.17169/refubium-32743
dc.description.abstract
The evolution of Earth's climate over geological timescales is linked to surface erosion via weathering of silicate minerals and burial of organic carbon. However, methodological difficulties in reconstructing erosion rates through time and feedbacks among tectonics, climate, and erosion spurred an ongoing debate on mountain erosion sensitivity to tectonic and climate forcing. At the heart of this debate is the question of whether late Cenozoic climate cooling has increased global erosion rates or not. The Himalaya plays a prominent role in this debate as its erosion produces a large fraction of global sediments delivered to ocean basins. We report a 6-Myr-long record of Be10-derived erosion rates from the north-western Himalaya, which indicates that erosion rates in this region varied quasi-cyclically with a period of ∼1 Myr and increased gradually toward the present. We hypothesize that the observed pattern of erosion rates occurred in response to the tectonic growth of the Himalaya by punctuated basal and frontal accretion of rocks from the underthrusting Indian plate and concomitant changes in topography. In this scenario, basal accretion episodically changes rock-uplift patterns, which brings landscapes out of equilibrium and results in quasi-cyclic variations in erosion rates. We used numerical landscape evolution simulations to demonstrate that this hypothesis is physically plausible. We attribute the long-term increase in erosion rates to the erosional response of topography due to frequent basal accretion relative to frontal accretion. Because tectonic accretion processes are inherent to collisional orogenesis, they likely confound climatic interpretations of erosion rate histories.
en
dc.format.extent
27 Seiten
dc.rights.uri
https://creativecommons.org/licenses/by-nc-nd/4.0/
dc.subject
paleoerosion rate
en
dc.subject
foreland basin
en
dc.subject
basal accretion
en
dc.subject.ddc
500 Naturwissenschaften und Mathematik::550 Geowissenschaften, Geologie::550 Geowissenschaften
dc.title
Tectonic Accretion Controls Erosional Cyclicity in the Himalaya
dc.type
Wissenschaftlicher Artikel
dcterms.bibliographicCitation.articlenumber
e2021AV000487
dcterms.bibliographicCitation.doi
10.1029/2021AV000487
dcterms.bibliographicCitation.journaltitle
AGU Advances
dcterms.bibliographicCitation.number
3
dcterms.bibliographicCitation.volume
2
dcterms.bibliographicCitation.url
https://doi.org/10.1029/2021AV000487
refubium.affiliation
Geowissenschaften
refubium.affiliation.other
Institut für Geologische Wissenschaften / Fachrichtung Tektonik und Sedimentäre Systeme
refubium.resourceType.isindependentpub
no
dcterms.accessRights.openaire
open access
dcterms.isPartOf.eissn
2576-604X
refubium.resourceType.provider
WoS-Alert