大别_苏鲁造山带南缘前陆盆地演化特征_何明喜

石油与天然气地质

第28卷 第5期

O IL &GAS GEO LOGY

2007年10月

收稿日期:2006-12-25

第一作者简介:何明喜(1951)),男,高级工程师,油气地质及勘探 基金项目:中国石油化工股份有限公司科研项目(P02039)

文章编号:0253-9985(2007)05-0675-07

大别-苏鲁造山带南缘前陆盆地演化特征

何明喜,杜建波,曹建康,郭双亭,谢其锋,马荣芳

(中国石化河南油田分公司,河南南阳473132)

摘要:受中三叠世以来中央造山带东段从陆缘碰撞造山)陆内造山的构造机制转换控制,大别-苏鲁造山带南缘前陆盆地具有从陆缘)陆内,从海相)陆相的连续过渡特征,经历了发生)兴盛)消亡的完整过程。依据造山带构造机制转换及前陆盆地构造层序所反映的盆地演化的阶段性,具体划分为4个阶段:即1)前造山期被动陆缘(P 3)T 1)T 21)阶段,包括局部裂陷、持续沉降、萎缩残留3个亚阶段;2)陆缘主造山期周缘前陆盆地(T 22)T 3)阶段,具有海陆过渡相(T 22))陆相(T 3)前陆盆地的连续演化特征;3)陆内造山期陆内前陆盆地(J 1-2)阶段,发育陆内山前含煤碎屑岩沉积;4)后造山期转换伸展-伸展断陷盆地(J 3)E)阶段,前陆盆地消亡。

关键词:构造机制转换;陆缘造山;陆内造山;周缘前陆盆地;陆内前陆盆地;大别-苏鲁造山带南缘中图分类号:TE11111 文献标识码:A

Tectonic evol uti on characteristics of the foreland basi n on the southern

m argi n of the Dabie -Sulu orogenic belt

H e M i n gx ,i Du Jianbo ,Cao Jiankang ,Guo Shuang ting ,X ie Q ifeng ,M a Rongfang

(H enan O il f ield Company,SI N OPEC,N anyang,H enan 473132,China)

Abst ract :Controlled by t h e conversion of tect o nic m ec hanis m fro m conti n entalm arg i n co llisi o n or ogenesis to i n tra -continental orogenesis in the easter n seg m e nt of the central orogenic be lt since t h eM i d dle Triassic ,the for e l a nd basi n on t h e souther n m argin of the Da b i e -Sulu oroge n ic belt experi e nced a whole process of evo l u ti o n fro m i n itiati o n to

fl o urish and fi n all y to ex ti n ction and is featured i n conti n uous transiti o n fro m conti n e nta lm arg i n to i n tra -conti n ent and fro m m ari n e to continental i n ter m s of tect o nic setti n g .A ccor d i n g to t h e tectonic m echan i s m conversi o ns and tectonic evo l u tion stages reflected by the struct u ral sequences o f the foreland basi n ,the evo l u tion o f the f o reland basi n can be di v i d ed into f o ur stages :1)pre -orogenic passive m arg i n (P 3-T 1-T 21

),consisting of three sub -stages(partial fa u lted depressi o n -conti n uous subsidence -fading residual basi n );2)peri p heral foreland basi n duri n g the m ai n or ogen i c period (T 22

-T 3),a stage c haracterized by continuous tecton i c evoluti o n ofm ari n e -conti n ental transitiona l(T 22

)to conti n e n -tal(T 3)foreland basin ;3)i n tracontinental foreland basin during i n tra -conti n ental orogeny(J 1-2),featured in coa-l bear -i n g clastic r ock deposited i n i n tracontinental foreland area ;4)pos-t oroge n ic ex tensi o na-l e x tensi o nal faulted depression basi n (J 3-E),a peri o d whe n the foreland basin d i e s ou.t

K ey w ords :conversion o f tectonic m achan is m;continental m ar g in orogenesis ;i n traconti n enta l o r ogenesis ;pe -riphera l fore land basi n ;i n traconti n enta l fore l a nd basi n ;southern m arg i n o f the Dab i e -Su l u orogen ic belt 大别-苏鲁造山带南缘前陆盆地,发育在晚古生代被动陆缘盆地基础之上,以上叠晚中生代)新

生代伸展断陷盆地标志其消亡。受扬子与华北板块拼合及大别-苏鲁造山带形成演化的控制和影