U-PB Zircon Ages and Provenance of Upper Cenozoic Sediments from the Da Lat Zone, SE Vietnam : Implications For an Intra-Miocene Unconformity and Paleo-Drainage of the Proto–Mekong River. / Hennig, Juliane; Breitfeld, Hans Tim; Gough, Amy; Hall, Robert; Van Long, Trinh; Mai Kim, Vinh; Dinh Quang, Sang.

In: Journal of Sedimentary Research, Vol. 88, No. 4, 17.04.2018, p. 495-515.

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U-PB Zircon Ages and Provenance of Upper Cenozoic Sediments from the Da Lat Zone, SE Vietnam : Implications For an Intra-Miocene Unconformity and Paleo-Drainage of the Proto–Mekong River. / Hennig, Juliane; Breitfeld, Hans Tim; Gough, Amy; Hall, Robert; Van Long, Trinh; Mai Kim, Vinh; Dinh Quang, Sang.

In: Journal of Sedimentary Research, Vol. 88, No. 4, 17.04.2018, p. 495-515.

Research output: Contribution to journalArticlepeer-review

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@article{3a0314e5043a4da691996b1d8740c1cb,
title = "U-PB Zircon Ages and Provenance of Upper Cenozoic Sediments from the Da Lat Zone, SE Vietnam: Implications For an Intra-Miocene Unconformity and Paleo-Drainage of the Proto–Mekong River",
abstract = "The present-day Mekong River is the twelfth longest river in the world. It drains the Tibetan Plateau and forms a large delta in south Vietnam. Remnants of upper Cenozoic fluvial to marginal marine proto-Mekong sediments are exposed in the Da Lat Zone in southeast Vietnam, and are likely the on-land equivalents of large sediment packages offshore in the Cuu Long and Nam Con Son Basins. Provenance studies are used here to identify sources that allow reconstruction of sediment pathways. The Oligo-Miocene Di Linh Formation has a main Cretaceous zircon age population and subordinate Paleoproterozoic (c. 1.8-1.9 Ga) zircons, sourced mainly from Cretaceous plutons. In contrast, the Early Pliocene to Pleistocene Song Luy Formation includes additional Permian-Triassic and Ordovician-Silurian age populations which are interpreted to be sourced from basement rocks in central and northern Vietnam. There is a significant change in provenance between these formations, interpreted as an intra-Miocene unconformity. The Late Pliocene to Pleistocene Ba Mieu Formation shows a much greater abundance of Precambrian zircons, including a small age peak at c. 2.5 Ga, interpreted to be derived from old basement exposed in South China. Abundant Cretaceous zircons and a lack of Jurassic zircons in all three formations contrast with the present-day Mekong River delta. Therefore, the data are proposed to show a development of the proto-Mekong River progressing northward from the Da Lat Zone, to the Kontum Massif and northern Vietnam, to capturing of reversed rivers and/or reworking of sediments from old cratons in South China. ",
author = "Juliane Hennig and Breitfeld, {Hans Tim} and Amy Gough and Robert Hall and {Van Long}, Trinh and {Mai Kim}, Vinh and {Dinh Quang}, Sang",
year = "2018",
month = apr,
day = "17",
doi = "10.2110/jsr.2018.26",
language = "English",
volume = "88",
pages = "495--515",
journal = "Journal of Sedimentary Research",
issn = "1527-1404",
publisher = "SEPM Society for Sedimentary Geology",
number = "4",

}

RIS

TY - JOUR

T1 - U-PB Zircon Ages and Provenance of Upper Cenozoic Sediments from the Da Lat Zone, SE Vietnam

T2 - Implications For an Intra-Miocene Unconformity and Paleo-Drainage of the Proto–Mekong River

AU - Hennig, Juliane

AU - Breitfeld, Hans Tim

AU - Gough, Amy

AU - Hall, Robert

AU - Van Long, Trinh

AU - Mai Kim, Vinh

AU - Dinh Quang, Sang

PY - 2018/4/17

Y1 - 2018/4/17

N2 - The present-day Mekong River is the twelfth longest river in the world. It drains the Tibetan Plateau and forms a large delta in south Vietnam. Remnants of upper Cenozoic fluvial to marginal marine proto-Mekong sediments are exposed in the Da Lat Zone in southeast Vietnam, and are likely the on-land equivalents of large sediment packages offshore in the Cuu Long and Nam Con Son Basins. Provenance studies are used here to identify sources that allow reconstruction of sediment pathways. The Oligo-Miocene Di Linh Formation has a main Cretaceous zircon age population and subordinate Paleoproterozoic (c. 1.8-1.9 Ga) zircons, sourced mainly from Cretaceous plutons. In contrast, the Early Pliocene to Pleistocene Song Luy Formation includes additional Permian-Triassic and Ordovician-Silurian age populations which are interpreted to be sourced from basement rocks in central and northern Vietnam. There is a significant change in provenance between these formations, interpreted as an intra-Miocene unconformity. The Late Pliocene to Pleistocene Ba Mieu Formation shows a much greater abundance of Precambrian zircons, including a small age peak at c. 2.5 Ga, interpreted to be derived from old basement exposed in South China. Abundant Cretaceous zircons and a lack of Jurassic zircons in all three formations contrast with the present-day Mekong River delta. Therefore, the data are proposed to show a development of the proto-Mekong River progressing northward from the Da Lat Zone, to the Kontum Massif and northern Vietnam, to capturing of reversed rivers and/or reworking of sediments from old cratons in South China.

AB - The present-day Mekong River is the twelfth longest river in the world. It drains the Tibetan Plateau and forms a large delta in south Vietnam. Remnants of upper Cenozoic fluvial to marginal marine proto-Mekong sediments are exposed in the Da Lat Zone in southeast Vietnam, and are likely the on-land equivalents of large sediment packages offshore in the Cuu Long and Nam Con Son Basins. Provenance studies are used here to identify sources that allow reconstruction of sediment pathways. The Oligo-Miocene Di Linh Formation has a main Cretaceous zircon age population and subordinate Paleoproterozoic (c. 1.8-1.9 Ga) zircons, sourced mainly from Cretaceous plutons. In contrast, the Early Pliocene to Pleistocene Song Luy Formation includes additional Permian-Triassic and Ordovician-Silurian age populations which are interpreted to be sourced from basement rocks in central and northern Vietnam. There is a significant change in provenance between these formations, interpreted as an intra-Miocene unconformity. The Late Pliocene to Pleistocene Ba Mieu Formation shows a much greater abundance of Precambrian zircons, including a small age peak at c. 2.5 Ga, interpreted to be derived from old basement exposed in South China. Abundant Cretaceous zircons and a lack of Jurassic zircons in all three formations contrast with the present-day Mekong River delta. Therefore, the data are proposed to show a development of the proto-Mekong River progressing northward from the Da Lat Zone, to the Kontum Massif and northern Vietnam, to capturing of reversed rivers and/or reworking of sediments from old cratons in South China.

U2 - 10.2110/jsr.2018.26

DO - 10.2110/jsr.2018.26

M3 - Article

VL - 88

SP - 495

EP - 515

JO - Journal of Sedimentary Research

JF - Journal of Sedimentary Research

SN - 1527-1404

IS - 4

ER -