福建东山坑北复式岩体中蓝绿色角闪石矿物学特征及其形成环境探讨  

Mineralogy Characteristics and Formation Environment of Turquoise Amphiboles from Kengbei Complex Rocks in Dongshan County,Fujian Province,China

作　　者：史维鑫[1,2] 张达[1] 石建基[3] 狄永军[1] 李野[1] 张垚垚[1] 

机构地区：[1]中国地质大学地质过程与矿产资源国家重点实验室,北京100083 [2]国土资源实物地质资料中心,河北燕郊065201 [3]福建省闽东南地质大队,福建泉州362021

出　　处：《矿物学报》2013年第1期110-118,共9页Acta Mineralogica Sinica

基　　金：地质调查项目武夷山植被覆盖区成矿地质背景研究与成矿要素综合推断(资助号:1212011085472);武夷山成矿带中生代推覆构造与铜多金属找矿方向研究(资助号:1212010813064);武夷山成矿带铜多金属成矿规律研究(资助号:1212010533105);111计划(资助号:B07011)

摘　　要：角闪石作为福建东山坑北复式岩体的主要变质特征矿物之一,其详细的成因矿物学研究对解释该套岩体的变质变形特征和条件具有一定的指导意义。本文应用电子探针分析和斜长石-角闪石温压计、黑云母-石榴子石温压计对该区花岗岩中蓝绿色角闪石进行了成分分析和温压条件的研究。研究表明该区变质变形花岗岩中蓝绿色角闪石为铁浅闪石,大部分为岩浆结晶和次生交代的角闪石。通过斜长石-角闪石温压计计算得出其压力为0.40-0.72 GPa,变质温度大约为543-557℃。通过石榴石-黑云母温度计计算其变质温度为546-590℃。角闪石的成因矿物学研究表明坑北岩体的变质程度为低角闪岩相-高绿片岩相。变质作用相当于燕山造山运动的第Ⅲ幕,是与深大断裂有关的低压高温型区域。Genesis research on amphibole, a mineral with metamorphic characteristics Kengbei complex rocks, has significant assist for the explanation of the deformation characteristics and conditions metamorphism. In this paper, we analyzed the elements and studied the temperature-pressure condition for turquoise amphibole from the qranite by using electron microprobe, plagioclase-amphibole geothemobarometer and manometer and garnet-biotite geothemobarometer and manometer. Results show that turquoise amphibole from the metamorphic qranite from Dongshan County, Fujian Province, China is Ferro-Edenites, mostly with magmatic crystallization and secondary replacement amphibole, undet the pressure of 0.40 - 0.72 GPa, at the metamorphic temperature of 543 - 557 ℃. The rock of Kengbei metamorphic grade is mainly low amphiboles faeie-high green schist facie. The metamorphism equivalents to the phase Ⅲ of the Yanshan Orogeny, and is of the lowoltage high temperature type, with some connection with the deep fault.

关 键 词：坑北复式岩体 变质花岗岩 蓝绿色角闪石 温压计 低角闪岩相-高绿片岩相 

分 类 号：P571[天文地球—矿物学] P578[天文地球—地质学]