TY - JOUR
T1 - Distribution of the East China Sea continental shelf basins and depths of magnetic sources
AU - Lin, Jing Yi
AU - Sibuet, Jean Claude
AU - Hsu, Shu Kun
N1 - Funding Information:
Acknowledgments. This work was carried out within the frame of the Sino-French cooperation in Geosciences. We thank the National Science Council (NSC) of Taiwan and the Institut Franc¸ais in Taipei (IFT) for their financial support during the Ph. D. thesis of one of us (J.-Y. Lin). We particularly acknowledge A. Tanaka and S.-M. Lee for their very pertinent and constructive reviews. We also thank the Shanghai Offshore Petroleum Bureau for kindly providing the depth map of the base of Cenozoic sedimentary rocks in the East China Sea.
PY - 2005
Y1 - 2005
N2 - The acoustic basement map of the East China Sea, established by the Shanghai Offshore Petroleum Bureau with all available industry seismic data, shows the existence of a 30-km-wide, 10-km-deep basin, that we named the Ho Basin. The Ho Basin belongs to a series of elongated deep basins extending over 600 km east of the Taiwan-Sinzi Ridge and flanked to the East by a ridge named the Longwan Ridge in its northern part. This new system of basin and ridge was probably formed during middle Miocene, sometimes in between rifting episodes occurring in the Taipei Basin and Okinawa Trough. It complements the already defined system of five belts of backarc basins and associated arc volca nic ridges in the East China Sea, which are progressively younger from the Mainland China shoreline (late Cretaceous/early Tertiary) to the Okinawa Trough (Present). In order to determine the crustal thickness beneath the East China Sea continental shelf, we used a power spectrum method to calculate the depth of the top (Zt) and the centroid (Zo) of the magnetic basement by fitting a straight line through the high- and low-wave number portions of the power spectrum, respectively. Then, the depth of the base (Zb) is estimated from Zt and Zo. After optimizing the size of the data squares, we demonstrate that, except for basins more than 10 km deep, Zt corresponds to the basement depths and Zb, the depth of the Curie point, to the Moho depth. As wide-angle reflection and refraction data are scarce in the East China Sea, this method provides a way to characterize the crustal thickness of the East China Sea and to compute the theoretical heat flow values.
AB - The acoustic basement map of the East China Sea, established by the Shanghai Offshore Petroleum Bureau with all available industry seismic data, shows the existence of a 30-km-wide, 10-km-deep basin, that we named the Ho Basin. The Ho Basin belongs to a series of elongated deep basins extending over 600 km east of the Taiwan-Sinzi Ridge and flanked to the East by a ridge named the Longwan Ridge in its northern part. This new system of basin and ridge was probably formed during middle Miocene, sometimes in between rifting episodes occurring in the Taipei Basin and Okinawa Trough. It complements the already defined system of five belts of backarc basins and associated arc volca nic ridges in the East China Sea, which are progressively younger from the Mainland China shoreline (late Cretaceous/early Tertiary) to the Okinawa Trough (Present). In order to determine the crustal thickness beneath the East China Sea continental shelf, we used a power spectrum method to calculate the depth of the top (Zt) and the centroid (Zo) of the magnetic basement by fitting a straight line through the high- and low-wave number portions of the power spectrum, respectively. Then, the depth of the base (Zb) is estimated from Zt and Zo. After optimizing the size of the data squares, we demonstrate that, except for basins more than 10 km deep, Zt corresponds to the basement depths and Zb, the depth of the Curie point, to the Moho depth. As wide-angle reflection and refraction data are scarce in the East China Sea, this method provides a way to characterize the crustal thickness of the East China Sea and to compute the theoretical heat flow values.
KW - Backarc basins
KW - Depth of magnetic sources
KW - East China Sea
KW - Spectral analysis
UR - http://www.scopus.com/inward/record.url?scp=29944446932&partnerID=8YFLogxK
U2 - 10.1186/BF03351885
DO - 10.1186/BF03351885
M3 - 期刊論文
AN - SCOPUS:29944446932
SN - 1343-8832
VL - 57
SP - 1063
EP - 1072
JO - Earth, Planets and Space
JF - Earth, Planets and Space
IS - 11
ER -