Upper Miocene–Pliocene provenance evolution of the Central Canyon in northwestern South China Sea

Upper Miocene–Pliocene provenance evolution of the Central Canyon in northwestern South China Sea Provenance studies of the Central Canyon, Qiongdongnan Basin has provided significant insights into paleographic and sedi- mentology research of the South China Sea (SCS). A suite of geochemical approaches mainly including rare earth elemental (REE) analysis and detrital zircon U–Pb dating has been systematically applied to the “source-to-sink” system involving our upper Miocene–Pliocene Central Canyon sediments and surrounding potential source areas. Based on samples tracing the entire course of the Central Canyon, REE distribution patterns indicate that the western channel was generally characterized by positive Eu anomalies in larger proportion, in contrast to the dominance of negative values of its eastern side during late Miocene–Pliocene. Additionally, for the whole canyon and farther regions of Qiongdongnan Basin, the number of samples bearing negative Eu anomalies tended to increase within younger geological strata. On the other hand, U–Pb geochronology results suggest a wide Proterozoic to Mesozoic age range with peak complexity in Yanshanian, Indosinian, Caledonian and Jinningian periods. However in detail, age combination of most western samples displayed older-age signatures than the eastern. To make it more evidently, western boreholes of the Central Canyon are mainly characterized with confined Indosin- ian and Caledonian clusters which show great comparability with mafic-to-ultramafic source http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Marine Geophysical Research Springer Journals

Upper Miocene–Pliocene provenance evolution of the Central Canyon in northwestern South China Sea

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Publisher
Springer Journals
Copyright
Copyright © 2018 by Springer Science+Business Media B.V., part of Springer Nature
Subject
Earth Sciences; Oceanography; Geophysics/Geodesy; Earth Sciences, general; Offshore Engineering
ISSN
0025-3235
eISSN
1573-0581
D.O.I.
10.1007/s11001-018-9359-2
Publisher site
See Article on Publisher Site

Abstract

Provenance studies of the Central Canyon, Qiongdongnan Basin has provided significant insights into paleographic and sedi- mentology research of the South China Sea (SCS). A suite of geochemical approaches mainly including rare earth elemental (REE) analysis and detrital zircon U–Pb dating has been systematically applied to the “source-to-sink” system involving our upper Miocene–Pliocene Central Canyon sediments and surrounding potential source areas. Based on samples tracing the entire course of the Central Canyon, REE distribution patterns indicate that the western channel was generally characterized by positive Eu anomalies in larger proportion, in contrast to the dominance of negative values of its eastern side during late Miocene–Pliocene. Additionally, for the whole canyon and farther regions of Qiongdongnan Basin, the number of samples bearing negative Eu anomalies tended to increase within younger geological strata. On the other hand, U–Pb geochronology results suggest a wide Proterozoic to Mesozoic age range with peak complexity in Yanshanian, Indosinian, Caledonian and Jinningian periods. However in detail, age combination of most western samples displayed older-age signatures than the eastern. To make it more evidently, western boreholes of the Central Canyon are mainly characterized with confined Indosin- ian and Caledonian clusters which show great comparability with mafic-to-ultramafic source

Journal

Marine Geophysical ResearchSpringer Journals

Published: Jun 5, 2018

References

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