Structures of the Bohai Petroliferous Area,Bohai Bay Basin

This paper, for the first time, deals with a more systematic study of the structures in the Bohai petroliferous area that covers nearly one third of the Bohai Bay basin. The study mainly involves the effects of preexisting basement faults on the basin formation, the characteristics of basin geometry and kinetics, the modelling of the tectonic-thermal history, the polycyclicity and heterogeneity in the structural evolution and the natural seismic tomographic images of the crust and upper mantle. The authors analyze the features of the dynamic evolution of the basin in the paper and point out that the basin in the Bohai petroliferous area is an extensional pull-apart basin.

THE CHARACTERISTICS OF TECTONIC FACIES IN THE WESTERN TIANSHAN MT. AND ITS ADJACENT AREA,NORTHWESTERN CHINA

Based on the theory of plate tectonics, the authors combined the concept and analytic methods of tectonic facies, and divided the western Tianshan Mt. and its adjacent area into eight tectonic facies. i. e.① Kuluktage rejuvenational foreland basement fold-thrust facie, ②Kalpin rejuvenational foreland basement fold-thrust facie,③ Kuqa rejuvenational foreland fold-thrust facie. ④ Southern Tianshan backarc foreland mollasse facie. ⑤ Southern Tianshan Late Paleozoic magmatic arc facie. ⑥ Southern Tianshan backarc melange facie. ⑦ Central Tianshan composite magmatic are facie, and ⑧ Northern Tianshan foreare melange facie. F1nally. we reconstructed the history of the western Tianshan Paleozoic tectonic evolution.

Growth of the Huoerguosi anticline (north Tianshan Mountains) by limb rotation since the late Miocene

Huoerguosi 背斜，在北方 Tianshan 山山麓 fold-and-thrust 带定位了，是 trending 东方西方差错相关的褶层。在沿着 Jingou 河的生气的节，它的南方手足由 Anjihaihe 的生长前阶层组成( E ( 2-3 )一)， Shawan (( E-3-N-1 ) s )， Taxihe ( N ( 1 ) t )和 Dushanzi ( N ( 2 ) d )的更低的部分形成， trending 东方西方并且蘸到南方 55 学位，并且 Dushanzi ( N ( 2 ) d )和 Xiyu 的上面的部分的生长阶层(( N-2-Q ( 1 )) x )形成，哪个在 Xiyu 的底部在生长阶层的底从 55 个学位减少到 47 个学位的剧降(( N-2-Q ( 1 )) x )形成到类似于在 Xiyu 的顶的 0 个学位(( N-2-Q ( 1 )) x )形成。在背斜的北方手足的阶层垂直或打翻，并且被突破戳切导致 drag 褶层。深入地，背斜是对称的，并且它的核心包括白垩纪和侏罗记忍受煤的床。在地震侧面，在背斜的南方手足的生长前阶层的地震反射镜常常蘸到南方，并且生长阶层之一扇向南方，谁的向上蘸减少。沿着 Jingou 河山谷和在地震侧面显示出的背斜的深结构的南方手足生长阶层 outcropped 的几何学显示 Huoerguosi 背斜是由手足旋转成长的分开褶层背斜。基于生长模型和 magnetostratigraphic 年龄，在 Huoerguosi 背斜的成长过程期间，南方手足吸收的平均弄短率类似于 0.46 mm/a ，和背斜的平均高举率类似于超过平均免职率的 0.86 mm/a ，它根据背斜的顶强烈地被侵蚀的事实。考虑 Huoerguosi 背斜的对称的几何学并且忽略突破推进，整个背斜弄短应该非常类似于 0.92 mm/a，加倍在南方手足从生长决定的弄短的率。