摘要
选取纵穿南海北部陆缘的长排列多道地震剖面,利用挠曲回剥和重力异常模拟相结合的过程导向法(process-oriented gravity modelling,POGM),计算了研究区内不同构造单元同张裂及裂后阶段的岩石圈有效弹性厚度(effective elastic thickness,Te),并对其分布特征进行了详细分析。计算结果显示:张裂过程中岩石圈强度很弱;而裂后阶段岩石圈强度在不同构造单元并不相同,其中番禺低隆起和下陆坡区强度较高,Te约为15km,而在北部坳陷带为7km左右,白云凹陷地区强度最低,仅为5km左右。获得的岩石圈强度结果,加深了对南海北部大陆边缘盆地特征和岩石圈构造演化过程的认识,具有重要的意义。
Using flexural backstripping and gravity anomaly modeling techniques and Process-Oriented Gravity Modelling（POGM）, we calculated variable effective elastic thickness （Te） of a long cable, multi-channel seismic reflection profile acrossthe northern margin of the South China Sea and analyzed the lithospheric strength distribution during rifting and post rifting.Results show that the lithospheric strength is weak during rifting and that the post-rifting Te is different for different tectonicunits. The lithospheric strengths of the Panyu Low Rise and Lower Slope are larger, with Te of about 15 km; the Te of theNorthern Depression is about 7 km, and the Baiyun Sag is the weakest in strength, whose Te is only about 5 km. Lithosphericstrength can help to understand the distribution of the basin and the process of lithospheric evolution in the northerncontinental margin of the South China Sea.
出处
《热带海洋学报》
CAS
CSCD
北大核心
2014年第1期62-68,共7页
Journal of Tropical Oceanography
基金
国家自然科学基金(41176050)
关键词
有效弹性厚度
白云凹陷
重力模拟
珠江口盆地
Lithospheric effective elastic thickness
Baiyun Sag
Gravity anomaly modeling
Pearl River Mouth Basin
