Catchment-wide weathering and erosion rates of mafic, ultramafic, and granitic rock from cosmogenic meteoric 10Be/9Be ratios

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00025798%3A_____%2F18%3A00000271" target="_blank" >RIV/00025798:_____/18:00000271 - isvavai.cz</a>

Result on the web

<a href="https://www.sciencedirect.com/science/article/pii/S0016703717307147?via%3Dihub" target="_blank" >https://www.sciencedirect.com/science/article/pii/S0016703717307147?via%3Dihub</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.gca.2017.11.005" target="_blank" >10.1016/j.gca.2017.11.005</a>

Result language

angličtina

Original language name

Catchment-wide weathering and erosion rates of mafic, ultramafic, and granitic rock from cosmogenic meteoric 10Be/9Be ratios

Original language description

We present catchment-wide rates of weathering, erosion,and denudation measured with cosmogenic nuclides. We use the ratio of the meteoric cosmogenic nuclide 10Be, deposited from the atmosphere onto the weathering zone, to stable 9Be, a trace metal released by silicate weathering.We tested this approach in stream sediment and water from three upland forested catchments in the Czech Republic. The catchments are underlain by felsic (granite), mafic (amphibolite) and ultramafic (serpentinite) rocks. Due to acid deposition, the waters in the granite catchment exhibit acidic pH, whereas waters in the mafic catchments exhibit neutral to alkaline pH values due to their acid buffering capability. The atmospheric depositional 10Be flux is estimated to be balancedwith the streams’ dissolved and particulate meteoric 10Be export flux to within a factor of two. Derived Earth surface metrics comprise (1) Denudation rates calculated from the 10Be/9Be ratio of the ‘‘reactive” Be range between 110 and 185 t km 2 y 1 (40 and 70 mm ky 1). These rates are similar to denudation rateswe obtained from in situ-cosmogenic 10Be in quartz minerals present in the bedrock or in quartz veins in the felsic and the maficcatchment. (2) The degree of weathering, calculated from the fraction of 9Be released from primary minerals as a new proxy, isabout 40–50percent in the mafic catchments, and 10percent in the granitic catchment. Lastly, (3) erosion rates were calculated from 10Be concentrationsin river sediment and corrected for sorting and dissolved loss. These amount to 50percent of denudation rates from 10Be/9Bein the mafic and ultramafic catchments, the remainder being mass loss in the dissolved form by weathering. In contrast, erosioncomprises most of the mass loss in the granitic catchment. This method allows quantifying rates of erosion and weathering in mafic rock over the time scale of weathering that are, unlike in situ cosmogenic 10Be, independent from the presence of quartz.

Czech name

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Czech description

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Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

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OECD FORD branch

10511 - Environmental sciences (social aspects to be 5.7)

Project

—

Continuities

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year

2018

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Name of the periodical

Geochimica et Cosmochimica Acta

ISSN

0016-7037

e-ISSN

—

Volume of the periodical

222

Issue of the periodical within the volume

February

Country of publishing house

GB - UNITED KINGDOM

Number of pages

24

Pages from-to

618-641

UT code for WoS article

000424972200035

EID of the result in the Scopus database

2-s2.0-85036579637