10.6084/m9.figshare.3452897
Q. Li
Q.
Li
S. Liu
S.
Liu
Z. Wang
Z.
Wang
Y. Shen
Y.
Shen
L. Zhang
L.
Zhang
J. Zhang
J.
Zhang
Provenance and geotectonic setting of the Palaeoproterozoic Zhongtiao Group and implications for assembly of the North China
Craton: whole-rock geochemistry and detrital zircon data
Geological Society of London
2016
geochemical characteristics
detrital zircon data Geochemical data
Zr
Nd
mafic components
North China Craton
Fe 2 O 3
Palaeoproterozoic Zhongtiao Group
felsic
SiO
Al
Geology
2016-06-21 10:43:19
Journal contribution
https://geolsoc.figshare.com/articles/journal_contribution/Provenance_and_geotectonic_setting_of_the_Palaeoproterozoic_Zhongtiao_Group_and_implications_for_assembly_of_the_North_China___Craton_whole-rock_geochemistry_and_detrital_zircon_data/3452897
<p>Geochemical data reveal the contrasting geochemical characteristics of the metasediments in the Jiepailiang and Bizigou formations
of the Palaeoproterozoic Zhongtiao Group, North China Craton. High Zr/Sc and SiO<sub>2</sub>/Al<sub>2</sub>O<sub>3</sub> values and especially the evolved and uniform nature of <em>ε</em><sub>Nd</sub>(<em>t</em>) values plus detrital zircon U–Pb ages and Hf isotopic signatures for the former are consistent with derivation from an evolved
felsic source with sedimentary recycling signs. However, lower values of SiO<sub>2</sub>/Al<sub>2</sub>O<sub>3</sub> and Zr/Sc, and higher contents of Fe<sub>2</sub>O<sub>3</sub>* and MgO for the latter indicate input of more mafic components. These geochemical characteristics, combined with the wide
range of <em>ε</em><sub>Nd</sub>(<em>t</em>) values, suggest that these rocks were derived in part from old continental material, dominated by felsic rocks of magmatic
origin, and in part from a continental island arc, which accounts for the variable mixture of mafic components. These results
suggest that the Zhongtiao Group was deposited after <em>c</em>. 2110 Ma, in a back-arc basin, behind an eastward-directed subduction system. Subsequent deformation and metamorphism reflect
closure of the oceanic basin between the Eastern and Western blocks of the North China Craton, along the Trans-North China
Orogen, contributing to amalgamation of the supercontinental Columbia.
</p>