邯邢地区燕山期多重火成岩系的成因

邯邢地区燕山期火成杂岩由一系列基性—超基性、中基性、中偏碱性和碱性的侵入体组成。火成活动发生在109～171Ma之间。可将该区火成杂岩划分成4个系列,它们为角闪橄辉岩系,角闪闪长岩系,二长岩系和正长岩系。岩石化学特征表明不同岩系具有独立的成因,矿物分离结晶作用是控制岩浆演化的主导机制。文中提出的多重火成岩系是指同一造山旅回的不同阶段,在同一地区产出的来自不同源区的多个火成岩系的共存。

PETROGENESIS OF MULTIPLE IGNEOUS ROCK SERIES,HAN-XING DISTRICT, HEBEI PROVINCE, CHINA

The igneous complex in Han-Xing district includes a group of basic-ultraba-sic, intermidiate-basic, intermidiate and alkaline intrusions, emplaced in a period from 171 to 109 Ma B. P. It is divided into four series: (1) hornblende-divine-pyroxenite series, (2) hornblende-diorite series, (3) monzonite series, and (4) syenite series.Petrochemical date indicate that the diverse series had independent origins, and fractional crystallization had been the main process controlling the evolution of the magmas.Hence the multiple igneous rock complex here is unconnected either in their location or in their derivation but was emplaced on different stages of an orogenic cycle that involved the related area.