印支地块的逃逸旋转与莺歌海盆地的发育演化

Extrusion and rotation of Indochina block and
development and evolutional process ofY inggeha i Basin,
South China Sea

王雅明1 佟殿君2 任建业2

W ang Yaming,TongDianjun, Ren Jianye

1 内蒙古自治区矿产实验研究所, 内蒙古呼和浩特010031; 2 中国地质大学, 湖北武汉430074

( Inner Mongo lia Institute ofM ineral
Experimentation, Huhehot 010031, China ),

Reg ional tectonic evo lution affec ting deve lopm ent of
Y inggeha i Basin is ana lyzed system atica lly by synthesis of
new reg ional data. Autho rs cons ide r that c lo ckw ise rotation of
Indochina B lock and inner secondary blocks during ex trus ion
sou theastw ards of Indochina Block g rea tly a ffected and
contro lled basin gene ration in the m arg in of blocks. Tecton ic
evo lution o fY inggeha i bas in w asm a inly contro lled by sin istra l
strike slip and c lockw ise rotation o f Indochina blo ck relativ e
to Sou th China b lock, based on wh ich three tecton ic
evo lutionary phases are identified. They are s inistral strikeslip
ex tens ion phase, duc tile m iddle- low er c rust ex tens ion
and therm al subs idence phase, and acce le rated subsidence
phase. New dynam ic evo lutionary m ode l on Y inggeha i basin is
o f benefit to e luc idate tecton ic evo lution of continenta lm arg in
in the northw estern South Ch ina Sea and prospecting of o il
and gas in the basin.