地质论评
地質論評
지질론평
GEOLOGICAL REVIEW
2009年
6期
804-815
,共12页
旷红伟%柳永清%彭晓波%杨飞%陈铭培%岑超%彭楠%李家华%王晓光%穆朋飞%顾兴明
曠紅偉%柳永清%彭曉波%楊飛%陳銘培%岑超%彭楠%李傢華%王曉光%穆朋飛%顧興明
광홍위%류영청%팽효파%양비%진명배%잠초%팽남%리가화%왕효광%목붕비%고흥명
华北%早白垩世%沉积%构造%盆地
華北%早白堊世%沉積%構造%盆地
화북%조백성세%침적%구조%분지
North China%Early Cretaceous%deposition%tectonic%Zhoukou depression
谭庄-沈丘凹陷位于华北克拉通南部,大别山北缘与华北克拉通接壤部位的周口坳陷内.区内下白垩统地层厚度巨大,沉积和沉降中心偏于盆地南侧.沉积物以细粒陆源碎屑砂岩、粉砂岩和泥岩为主;岩石中富含火山碎屑,成分成熟度和结构成熟度中等;发育一系列牵引流成因的沉积构造,属于与河流三角洲--滨浅湖沉积体系及其沉积相的组合,早白垩世沉积物源供给主要来自南部.盆地的发育和演化及早白垩世沉积主要受南部边界的叶鲁断裂控制,属于张性正断层,后期该断层发生明显地向盆地方向的逆冲.依据下白垩统砂岩组分构造属性、砂岩岩屑组分、沉积物常量元素和稀土元素地球化学特征分析以及与南部大别山造山带火山岩发育年代的对比等综合分析认为,谭庄-沈丘凹陷形成于早白垩世伸展大地构造背景,是受大别山北缘山盆耦合作用影响形成的断陷型沉积盆地.
譚莊-瀋丘凹陷位于華北剋拉通南部,大彆山北緣與華北剋拉通接壤部位的週口坳陷內.區內下白堊統地層厚度巨大,沉積和沉降中心偏于盆地南側.沉積物以細粒陸源碎屑砂巖、粉砂巖和泥巖為主;巖石中富含火山碎屑,成分成熟度和結構成熟度中等;髮育一繫列牽引流成因的沉積構造,屬于與河流三角洲--濱淺湖沉積體繫及其沉積相的組閤,早白堊世沉積物源供給主要來自南部.盆地的髮育和縯化及早白堊世沉積主要受南部邊界的葉魯斷裂控製,屬于張性正斷層,後期該斷層髮生明顯地嚮盆地方嚮的逆遲.依據下白堊統砂巖組分構造屬性、砂巖巖屑組分、沉積物常量元素和稀土元素地毬化學特徵分析以及與南部大彆山造山帶火山巖髮育年代的對比等綜閤分析認為,譚莊-瀋丘凹陷形成于早白堊世伸展大地構造揹景,是受大彆山北緣山盆耦閤作用影響形成的斷陷型沉積盆地.
담장-침구요함위우화북극랍통남부,대별산북연여화북극랍통접양부위적주구요함내.구내하백성통지층후도거대,침적화침강중심편우분지남측.침적물이세립륙원쇄설사암、분사암화니암위주;암석중부함화산쇄설,성분성숙도화결구성숙도중등;발육일계렬견인류성인적침적구조,속우여하류삼각주--빈천호침적체계급기침적상적조합,조백성세침적물원공급주요래자남부.분지적발육화연화급조백성세침적주요수남부변계적협로단렬공제,속우장성정단층,후기해단층발생명현지향분지방향적역충.의거하백성통사암조분구조속성、사암암설조분、침적물상량원소화희토원소지구화학특정분석이급여남부대별산조산대화산암발육년대적대비등종합분석인위,담장-침구요함형성우조백성세신전대지구조배경,시수대별산북연산분우합작용영향형성적단함형침적분지.
Located at the sourthern margin of the North China Craton, the Tanzhuang-Shenqiu sag, Zhoukou depression, is filled with Lower Cretaceous sediments in a huge thinckness. Deposits in the sag are characterized by thinner grained clastic rocks with miderteran composition and texture maturations, such as mudstone, siltstone and sandstone, and especially rich in volcanic clastics. Sedimentary structures and depositional facies associations interpreted as fluvial-delta and lacustrine environments were recognized in this research. Present study insisted that sediments supply of the Tanzhuang-Shenqiu sag in Early Cretaceous are from the Dabie orogenic belt to the south. Basin's Formation was initially controlled by the southern marginal stretch fault, I.e.,Yelu fault, which became thrusting toward north at the end of Early Cretaceous. Based upon study of sandstone composition and Q-F-L diagram (Dickinson's diagram), geochemistry of major and REE elements of sediments and the geochonology of volocanic rocks, writers suggest that the Tanzhuang-Shenqiu sag formed in a regional stretch tectonic setting in the Early Cretaceous, was a original fault basin.
