华南绍兴-恩平富碱侵入岩带的厘定及其动力学意义初探  

Ascertainment of the Shaoxing Enping alkali rich intrusive rock zone and preliminary discussion on its geodynamic implications

作　　者：王强[1] 赵振华[1] 熊小林[1] 李献华[1] 包志伟[1] 

机构地区：[1]中国科学院广州地球化学研究所

出　　处：《地球化学》2002年第5期433-442,共10页Geochimica

基　　金：国家攀登计划预选项目(95-预-25);国家自然科学基金(40172028);中国科学院知识创新工程项目(KZCX2-102;KZCX2-SW-117);国家重点基础研究发展规划项目(G1999043202);国家博士后基金;南京大学内生金属矿床成矿机制研究国家重点实验室基金

摘　　要：根据野外地质及室内岩相学、矿物成分和岩石化学的研究,从华南腹地厘定了一条重要的中生代NE向富碱侵入岩带———绍兴-恩平富碱侵入岩带。该岩带全长约1400km,宽100～150km,不仅发育有狭义的碱性岩(方沸黑云橄榄黄长岩、白榴黄长煌斑岩、霞石正长岩、霓辉石正长岩、黑榴石正长岩和含霓石石英正长岩)和碱性花岗岩(钠闪石花岗岩、霓辉石钠闪石花岗岩),还发育有大量的正长岩类-二长岩类-碱长花岗岩或晶洞钾长花岗岩。这些富碱侵入岩主要形成于晚中生代。绍兴-恩平燕山期富碱侵入岩带的厘定将对研究华南中生代的动力学的背景与演化具有重要的意义。On the basis of the studies of field geology, petrography, mineral compositions and petrochemistry, an important Mesozoic alkali rich intrusive rock zone, the Shaoxing Enping alkali rich intrusive rock zone, is ascertained in the hinterland of South China. This rock zone, with a NE striking, the whole length of 1 400 km and the width of 100～150 km, is characterized by not onlyalkaline rocks (analcite biotite olivine melilitites, leucititic alnoites, nephelite syenites, aegirite augite syenites, melanite syenites, riebeckite syenite and aegirite bearing quartz syenites) and alkaline granite (riebeckite granite, and aegitite augite riebeckite granite), but also a lot of syenites, monzonites and alkaline feldspar granites or miarolitic K feldspar granites. The intrusive rocks were most probably produced in Late Mesozoic. The ascertainment ofShaoxing Enping alkaline intrusive rock zone is of great importance to studying the Mesozoic geodynamic setting and evolution of South China.

关 键 词：厘定 碱性岩 A型花岗岩 岩石学 动力学背景 华南地区 矿物成分 空间分布 

分 类 号：P588.1[天文地球—岩石学]