福建泉州蛇绿岩及其构造肢解

长乐-南澳断裂带北段分布的一系列基性——超基性岩块可以区分出四类岩石:变质橄栏岩、超镁铁质堆积杂岩、堆晶层状辉长岩和块状辉长岩,它们组成了泉州蛇绿岩,属科迪勒拉型,代表早期边缘海盆地或弧间盆地的上部地幔和洋壳。早白垩世晚期,闽台微大陆与闽浙中生代火山弧碰撞拼贴过程中,泉州蛇绿岩被构造肢解,形成 NW 向逆冲就位的长基超基性推覆岩席和 SE 向剪切逆冲就位的青兰山辉长岩岩块。构造肢解的泉州蛇绿岩构成了深层弧前混杂带。

QIANZHOU OPHIOLITE AND ITS TECTONIC DISMEMBERING

A series of mafic-ultramafic rock blocks scattering in the north segment of the Changle-Nanao fault Zone can be classified into four types:metamorphilc peridotie Ultramafic accumulate complex,accumulate gabbo and massive gabbro.They constitute Quanzhou codillera-type ophiolite,which represents uppor mantle and oceanic crust of early stage marginal basin or interarc basin.During the Late Early Cretaceous as the duration of col- lision between the Min-Tai microcontinent end the Fujiau Zhejiang Mesozoic volcanic arc, Quanzhou Ophiolite was dismembered.Some southeastward thrusts and a few northwestward thrusts resulted in Qinglanshan Gobbroic block and Changji ultramafic thrust sheet.The dis- membered ophiolite formed deep-level forearc melange.