DOI: 10.1016/j.quascirev.2015.10.012
Scopus记录号: 2-s2.0-84944892373
论文题名: Contrasting fluvial styles across the mid-Pleistocene climate transition in the northern shelf of the South China Sea: Evidence from 3D seismic data
作者: Zhuo H. ; Wang Y. ; Shi H. ; He M. ; Chen W. ; Li H. ; Wang Y. ; Yan W.
刊名: Quaternary Science Reviews
ISSN: 2773791
出版年: 2015
卷: 129 起始页码: 128
结束页码: 146
语种: 英语
英文关键词: East Asian monsoon
; Fluvial system
; Mid-Pleistocene climate transition
; Sea level
; Seismic geomorphology
; South China Sea
Scopus关键词: Atmospheric thermodynamics
; Geomorphology
; Glacial geology
; Landforms
; Rivers
; Sea level
; Seismology
; Stratigraphy
; East Asian monsoon
; Fluvial systems
; Mid-pleistocene climate transition
; Seismic geomorphology
; South China sea
; Climate change
英文摘要: Multiple successions of buried fluvial channel systems were identified in the Quaternary section of the mid-shelf region of the northern South China Sea, providing a new case study for understanding the interplay between sea level variations and climate change. Using three commercial 3D seismic surveys, accompanied by several 2D lines and a few shallow boreholes, the sequence stratigraphy, seismic geomorphology and stratal architecture of these fluvial channels were carefully investigated. Based on their origin, dimensions, planform geometries and infill architectures, six classes of channel systems, from Class 1 to Class 6, were recognized within five sequences of Quaternary section (SQ1 to SQ5). Three types of fluvial systems among them are incised in their nature, including the trunk incised valleys (Class 1), medium incised valleys (Class 2) and incised tributaries (Class 3). The other three types are unincised, which comprise the trunk channels (Class 4), lateral migrating channels (Class 5) and the stable channels (Class 6). The trunk channels and/or the major valleys that contain braided channels at their base are hypothesized to be a product of deposition from the "big rivers" that have puzzled the sedimentologists for the last decade, providing evidence for the existence of such rivers in the ancient record.Absolute age dates from a few shallow boreholes indicate that the landscapes that were associated with these fluvial systems changed significantly near the completion of the mid-Pleistocene climate transition (MPT), which approximately corresponds to horizon SB2 with an age of ~0.6 Ma BP. Below SB2, the Early Pleistocene sequence (SQ1) is dominated by a range of different types of unincised fluvial systems. Evidence of incised valleys is absent in SQ1. In contrast, extensive fluvial incision occurred in the successions above horizon SB2 (within SQ2-SQ5). Although recent studies call for increased incision being a product of climate-controlled increase in river discharge, the down-dip location of our study area suggests that relative sea level change was the most important control of the evolution of fluvial systems. However, it is acknowledged that climate change was also important through its role in regulating glacio-eustasy. We speculate that the small amplitude and periodicity of sea level cycles before and during the MPT were not sufficient to fully expose the shelf and cause extensive fluvial incisions. Completion of the MPT as well as the onset of 100 ky climate cycles at ~0.6 Ma, during which the duration of cycles and magnitude of sea level change both increased, are considered to be triggering event for extensive development of incised fluvial systems. In addition to the eustatically driven causes of enhanced incision, the intensification of the East Asia monsoon at 0.9 Ma and 0.6 Ma driven by the episodic uplift of the Tibetan Plateau may have also significantly enhanced the amplitude of sea level falls and thus the fluvial incisions of the northern shelf of the South China Sea. © 2015 Elsevier Ltd. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/59771
Appears in Collections: 过去全球变化的重建
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作者单位: State Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum, Beijing, China; Ocean College, Zhejiang University, Hangzhou, China; College of Geosciences, China University of Petroleum, Beijing, China; China National Offshore Oil Corporation Limited - Shenzhen, Guangzhou, China; School of Geosciences, Yangtze University, Wuhan, China
Recommended Citation:
Zhuo H.,Wang Y.,Shi H.,et al. Contrasting fluvial styles across the mid-Pleistocene climate transition in the northern shelf of the South China Sea: Evidence from 3D seismic data[J]. Quaternary Science Reviews,2015-01-01,129