再论冀北古缝合带的证据  

More on the evidence of the paleostylolitic zone in northern Hebei Province

作　　者：王仁民[1] 倪志耀[1] 袁建平[1] 童英[1] 

机构地区：[1]北京大学地球与空间科学学院,北京100871

出　　处：《岩石矿物学杂志》2002年第4期327-335,共9页Acta Petrologica et Mineralogica

基　　金：国家自然科学基金资助项目(4 986 2 0 0 3;4 9872 0 6 5 )

摘　　要：近南北走向的冀北太古宙麻粒岩相古陆核北侧受到近东西走向的古元古代造山带的交切。在陆缘沉积增生带内发现大量残存的古洋壳残片 ,包括蛇纹石化方辉橄榄岩、具鬣刺结构的苦橄岩、透闪石岩、橄长岩、异剥钙榴岩、细碧岩、退变榴辉岩、基性枕状熔岩和斜长花岗岩等 ,与陆缘沉积岩一起构成古蛇绿岩混杂带。推断该蛇绿岩混杂带从古元古代开始直到新元古代末有逐步向北后退发育的特点。The northern margin the NS_extending ancient continental block of Archean granulite facies in northern Hebei Province is intersected by the WE_stretching Early Proterozoic orogenic belt. Lots of residual oceanic crusts such as serpentinized harzburgites, spinifex picrite, tremolitite, troctolite, rodingite, spilite, retrograded eclogite, pillow basic lava and plagiogranite are found in the continental marginal sedimentary-accreting zone. These crusts and continental marginal sedimentary rocks make up a typical ophiolitic mélange belt. It can be concluded that this ophiolitic mélange belt was formed progressively from south to north between Early Proterozoic and the end of Proterozoic.

关 键 词：元古宙 古缝合带 古洋壳 河北 造山带 

分 类 号：P548.2[天文地球—构造地质学]