کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
6434217 1636818 2012 12 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Shallow anatomy of a continent-ocean transition zone in the northern South China Sea from multichannel seismic data
موضوعات مرتبط
مهندسی و علوم پایه علوم زمین و سیارات فرآیندهای سطح زمین
پیش نمایش صفحه اول مقاله
Shallow anatomy of a continent-ocean transition zone in the northern South China Sea from multichannel seismic data
چکیده انگلیسی

The Cenozoic tectonic evolution of the South China Sea is reflected in diverse tectonic processes including continental rifting, seafloor spreading, subduction, terrane collision and strike-slip fault movement. A continent-ocean transition zone in the northern South China Sea caused by the lithospheric extension when the continent underwent break-up, rifting and later seafloor spreading, is clearly imaged in the multi-channel seismic data presented in this study. The morphological units of the continent-ocean transition zone are the rift-depression, the volcanic zone and tilted fault blocks. The volcanic zone represents a highest extension zone within the continent-ocean transition zone and is mainly distributed in the southern slope uplift zone along the northern passive margin of the South China Sea. The large listric-normal faults bounding the Dongsha Rise and Baiyun Sag are evidenced in the seismic image. The passive margin in the northern South China Sea underwent the wide-rift to narrow-rift process in the transition zone as inferred from the relation between the surface heat flow and initial rifted crustal thickness. The continent-ocean transition zone in the continental margin of the South China Sea is consistent with high heat flow zone (average 90 mW.m− 2) observed in the previous heat flow measurements and at ODP Site 1148, and is manifested in a sharp change of the P-wave velocity. The rifted margin of the South China Sea is a non-typical magma poor passive margin or an intermediary form between the Iberian-type non-volcanic and the Greenland-type volcanic margin compared to the world's typical passive margins.

► An anomalous continent-ocean transition zone (COT) is imaged by seismic data. ► A listric-normal fault defines a boundary between the Dongsha Rise and Baiyun Sag. ► The images of the COT indicate a 115-120 km wide zone. ► The large volcanic zone in the COT represents a highest extension zone.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Tectonophysics - Volumes 554–557, 25 July 2012, Pages 18-29
نویسندگان
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