کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
6446662 | 1640805 | 2015 | 19 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Contrasting fluvial styles across the mid-Pleistocene climate transition in the northern shelf of the South China Sea: Evidence from 3D seismic data
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
علوم زمین و سیارات
زمین شناسی
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چکیده انگلیسی
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 â¼0.6 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 100Â ky climate cycles at â¼0.6 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.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Quaternary Science Reviews - Volume 129, 1 December 2015, Pages 128-146
Journal: Quaternary Science Reviews - Volume 129, 1 December 2015, Pages 128-146
نویسندگان
Haiteng Zhuo, Yingmin Wang, Hesheng Shi, Min He, Weitao Chen, Hua Li, Ying Wang, Weiyao Yan,