Expedition 349 summary

Li, C.-F.; Lin, Jian; Kulhanek, Denise K.; Williams, T.; Bao, Rui; Briais, A.; Brown, Elizabeth; Chen, Y.; Clift, Peter D.; Colwell, Frederick S.; Dadd, K.A.; Ding, Weiwei; Almeida, Ivàn; Huang, Xiaoxia; Hyun, Sangmin; Jiang, Tao; Koppers, A. A.; Li, Q.; Liu, C.; Liu, Q.; Liu, Z.; Nagai, Renata Hanae; Peleo-Alampay, A.; Su, Xinming; Sun, Z.; Tejada, M. L. G.; Trinh, H.S.; Yeh, Yun-Chi; Zhang, C.; Zhang, F.; Zhang, G.-L.; Zhao, Xixi

doi:10.14379/iodp.proc.349.101.2015

Cited by 42 publications

(23 citation statements)

References 87 publications

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“…15 Ma in the East Sub-basin (ESB) and ca. 16 Ma in the Southwest Sub-basin (SWSB). However, except for the chronostratigraphies of the ODP Leg 184 [11,[13][14][15] and IODP Leg 349 sites [12,16], no other well-dated long cores have been characterized.…”

Section: Introductionmentioning

confidence: 99%

Astronomical tuning and magnetostratigraphy of Neogene biogenic reefs in Xisha Islands, South China Sea

Long

Jian

et al. 2018

Science Bulletin

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Section: Introductionmentioning

confidence: 99%

Astronomical tuning and magnetostratigraphy of Neogene biogenic reefs in Xisha Islands, South China Sea

Long

Jian

et al. 2018

Science Bulletin

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“…This rift margin shows none of the expected characteristics of magma‐rich margins, such as thick igneous crusts and seaward‐dipping reflectors, but is recently confirmed to be characterized by extreme lithospheric extension without mantle exhumation, distinct from the classic North Atlantic magma‐poor margin (Larsen et al, ). The finally continental breakup and opening of the V‐shaped South China Sea in the Oligocene–Early Miocene (32–15 Ma; C. F. Li et al, ) has been traditionally viewed as a consequence of either the extrusion tectonics of the Indochina Block along the Red River Shear Zone (Leloup et al, ; Tapponnier et al, ) or by slab pull from the hypothetical Proto‐South China Sea subduction beneath Borneo (Hall, ; Morley, ; Taylor & Hayes, ; Figure ). Apart from these two local mechanisms, more regional factors like the Pacific subduction along the eastern Asian margin (Taylor & Hayes, ; J. Xu et al, ; Yin, ), the upwelling mantle plume referred as “Hainan Plume” (Q. Yan et al, ; Yu et al, ; G.‐L.…”

Section: Geological Overviewmentioning

confidence: 99%

Cretaceous–Palaeogene sedimentary evolution of the South China Sea region: A preliminary synthesis

et al. 2019

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Rocks in extensional settings are generally sensitive to destruction and erosion, resulting in poor preservation potential and accumulation of their eroded components. The South China margin was dominated by a prolonged extensional setting from Late Mesozoic to Early Cenozoic, and this geological history is exactly archived in sediments within and surrounding the present South China Sea. However, the sedimentary evolution of the region, especially prior to the continental breakup and oceanic spreading, remains an issue of uncertainty and controversy, mostly due to limited borehole penetration and poor seismic reflection data for deeply buried sequences, as well as the lack of reliable regional stratigraphic framework. Here, we illustrate the Cretaceous–Palaeogene sedimentary evolution of the South China Sea region by synthesizing relevant data from previous literature and our own observations and displaying the evolution of lithofacies in sequential palinspastic reconstructions. The preferred palaeogeographic scenarios incorporate the latest interpretations of the conjugate relationship between continental margins as well as the birth and demise of the hypothetical Proto‐South China Sea. The patterns of lithofacies and depositional environments at regional scales, along with available provenance data, clearly reveal sedimentary responses to the significant Mesozoic–Cenozoic transition of plate geodynamics and magmatism along the Asian margin and provide implications for the potential mechanism of Cenozoic extension represented by distinct yet continuous processes of continental rifting and oceanic spreading.

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“…theo [4, 8-11, 16, 23-25] Theo tài liệu tuổi thu thập tại các miệng núi lửa và số liệu khoan sâu Đại Dương (ODP 1431) có thể chia hoat động phun trào bazan tại Trũng Biển Đông thành 3 giai đoạn chính: Giai đoạn Miocen sớm (23,8-23,9 tr.n) tại khu vực Đông Bắc bồn trũng thuộc trục tách giãn giai đoạn sớm (tương ứng với đường cổ từ 11), thành phần là bazan Trachit [23]. Giai đoạn Miocen giữa (13,95 tr.n) thuộc trục tách giãn giai đoạn giữa (tương ứng với đường cổ từ giữa 8-9), thành phần là bazan Tholeit [8].…”

Section: Hình 1 Sơ đồ Phân Bố Và Tuổi Các Thành Tạo Bazan Khu Vực Biunclassified

Geochemistry and Petrogenesis of Volcanic Rocks and Their Mantle Source in the East Vietnam Sea and Adjacent Regions in the Cenozoic

Anh

Hoàng

Phách

et al. 2018

JMST

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The East Vietnam Sea is one of the largest marginal basins in western Pacific Ocenan, formed by breaking of continental margin in the Late Mesozoic. Geochemical data of the Miocene - Pleistocene bazanic samples collected in the East Sea and neighboring areas show two major eruption trends that reflect the formation and development of the region. The early eruption event is characterized by low alkaline, TiO2, Na2O, K2O and P2O5, and high SiO2 group, comprising olivine and tholeiitic bazans. The later eruption demonstrates high alkaline, TiO2, Na2O, K2O and P2O5, and low SiO2 group, mainly generated by central-type volcanic eruptions, consisting of alkaline olivine and olivine bazans. Distinctive geochemistry of the volcanic rocks within the East Vietnam Sea and adjacent areas is illustrated by wide range of Magnesium index (Mg#= 35-75). At the values of Mg#>65, the relation between Mg# and major oxides is unclear. In contrast, Mg#65 (Olivine differentiation) the isotope ratios start changing. The primitive components are computed based on the principle of olivine compensation. The computed results show that the critical pressure for Tholeiite melting was estimated from ~11.97-20.33 Kb (ca. 30 - 60 km deep) and the Alkaline melting pressure varies from ~16.87-34.93 Kb (corresponding to the depths of ~60 km to 100 km). The continuous range of melting pressures suggests two trends of tholeiitic and alkaline eruptions occurr at various depths in the same magmatic source. Hight temperature and melting pressure of the primitive magma are dependent on partial melting pressure. Possibly, this process was triggered by the asthenosphere intrusion resulted from the closure of the Neo-Tethys following the India - Eurasia collision. This event has not only made the mantle hotter and easily melted but also triggered the opening of the marginal seas, including the East Vietnam Sea.

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Expedition 349 summary

Abstract: Introduction 3 Background 6 Scientific objectives 10 Site summaries 30 Expedition synthesis 34 Preliminary scientific assessment 35 Operations 40 References

Cited by 42 publications

References 87 publications

Astronomical tuning and magnetostratigraphy of Neogene biogenic reefs in Xisha Islands, South China Sea

Astronomical tuning and magnetostratigraphy of Neogene biogenic reefs in Xisha Islands, South China Sea

Cretaceous–Palaeogene sedimentary evolution of the South China Sea region: A preliminary synthesis

Geochemistry and Petrogenesis of Volcanic Rocks and Their Mantle Source in the East Vietnam Sea and Adjacent Regions in the Cenozoic

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