漳州复式岩体锆石的标型特征及地球化学意义

Typomorphic Characteristics and Geochemical Significance of Zircons in Zhangzhou Composite Body

漳州复式岩体共分七次侵入(Ⅰ—Ⅶ),对区内Ⅱ至Ⅶ次岩体20个人工重砂的锆石作了大量测试研究和综合分析,确定了五种锆石类型:前身锆石、富锆锆石、富铪锆石、变生锆石及贫铪锆石。本文重点论述各类锆石的晶出产状,结晶形态,矿物物理、矿物化学特征及标型意义,并探讨标型特征的控制因素和地球化学条件。据锆石的标型和成因特征,提出本区Ⅱ—Ⅴ、Ⅶ次及Ⅵ次岩体分别与J.P.Pupin(1980)的地壳+地幔和地幔或以地幔为主成因的花岗岩相当。

There were seven intrusions (Ⅰ—Ⅶ)which taken place in Zhangzhou Composite Body. Five types of zircons (i. e. rounded zircon ,zircon rich in Zr ,zircon rich in Hf ,metamict zircorn and zircon meager in Hf) have been identified in accordance with a large amount of chemical/synthetic analysis on 20 pieces of artificial panning zircon concentrates taken from Ⅱ--Ⅶ rock bodies. The paper discusses especially the crystallization occurrence, the crystal morphology, the physical/chemical features of the minerals and the typomorphic significance, as well as the controlling factors/geochemical conditions of typomorphic characteristics. And according to typomorphic and genetic characteristics, it consequently presents that Ⅱ--Ⅴ, Ⅶ and Ⅵ rock bodies in the area are corresponding to crust+mantle-derived, mantie-derived and mainly mantle derived-granite suggested by J. P. Pupin (1980) seperately.