首页|Neon isotopic signature applied to detrital provenance assignment in foreland basins

Neon isotopic signature applied to detrital provenance assignment in foreland basins

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  • NSTL
  • Elsevier
Cosmogenic noble gas isotope Ne-21 in terrestrial rocks has been used primarily to determine timing and rates of the Earth's surface evolution. Here we explore the ability of detrital Ne-21 as a provenance tracer, considering that Ne isotopes produced in source rocks could be preserved in minerals over geological time and might be predominant in total Ne inventory of sediments sunk in basins. This ability is predicated on potential source terranes of a given stratigraphic section with distinct neon isotopic signatures. Here we analyze neon isotopes of a well-dated Miocene-Pleistocene sedimentary archives in Kuqa foreland basin of southern Tianshan. The data suggest that the neon isotopic signature, which is expressed as c m and defined in this work as the excess Ne-21/Ne-20-ratio relative to atmospheric ratio, is stratigraphically sensitive to changes in local source terranes. This result is compatible with U/Pb provenance analysis and also supported by evidences from sandstone petrography and heavy mineral analysis. Influence of other non-source related Ne-21 components in sedimentary archives on sensitivity of epsilon(Ne) has proven to be negligible. Furthermore, the integrated stratigraphic signatures of neon isotope and U/Pb age permit the detection of differential erosion in drainage basin, by which the tectonic or climatic effects on geomorphic evolution could be deciphered.

Neon isotopic signatureProvenance tracerKuqa foreland basinThe southern TianshanDifferential erosionU/PbCHINESE TIEN-SHANCENOZOIC TECTONIC EVOLUTIONNUCLIDE PRODUCTION-RATESIN-SITUNORTHWEST CHINATERRESTRIAL ROCKSNOBLE-GASESTARIM BASINNORTHERNRANGE

Wu, Ying、Wang, Ying、He, Huaiyu、Ma, Yan、Zheng, Dewen、Zhang, Huiping、Pang, Jianzhang、Wang, Yizhou

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China Earthquake Adm

Chinese Acad Sci

2022

10.1016/j.chemgeo.2021.120701

Chemical geology

Chemical geology

EISCI
ISSN：0009-2541
年,卷(期)：2022.590
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