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| 甘肃红石山地区印支期花岗岩地球化学特征及成因讨论 | |
| 引用本文： | 黄增保,金霞,李葆华,魏志军.甘肃红石山地区印支期花岗岩地球化学特征及成因讨论[J].西北地质,2011,44(1):10-19. |
| 作者姓名： | 黄增保 金霞 李葆华 魏志军 |
| 作者单位： | 1. 成都理工大学地球科学学院,四川,成都,610059;甘肃省地质调查院,甘肃,兰州,730000 2. 甘肃省地质调查院,甘肃,兰州,730000 3. 成都理工大学地球科学学院,四川,成都,610059 |
| 基金项目： | 中国地调局地质大调查项目:甘肃1:25万红宝石幅区域地质调查 |
| 摘 要： | 红石山地区印支期花岗岩位于甘肃北山地区的红石山蛇绿混杂岩带中,由马鞍山北岩体、小草湖岩体和红石山岩体组成,岩性主要为英云闪长岩、花岗闪长岩和二长花岗岩,含角闪质和镁铁质暗色深源包体。同位素年龄为237.8-240 M a,是中三叠世侵位的。通过对其岩石化学、稀土和微量元素的研究表明,红石山地区印支期中酸性侵入岩大体可划分为两类：一类为高S r低Y型岩体（马鞍山岩体）,具有埃达克质岩的地球化学特征,推测可能是加厚的下地壳部分熔融形成的,其残留相为榴辉岩或角闪榴辉岩;另一类为低S r低Y型岩体（小草湖岩体和红石山岩体）,以较低的S r、A l和具明显的负铕异常而区别于埃达克质岩,又因其低Y和HREE而类似于埃达克质岩,推测源岩残留相中有斜长石存在,相当于高压麻粒岩相环境,可能也形成于加厚下地壳底部。 |
| 关 键 词： | 印支期花岗岩 红石山地区 埃达克质岩石 低Sr低Y型花岗岩 |
Petrological and Geochemical Characteristics of Indosinian Granites in Hongshishan Area,Gansu Province and Discussion on Its Genesis |
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| HUANG Zeng-bao,JIN Xia,LI Bao-hua,WEI Zhi-jun.Petrological and Geochemical Characteristics of Indosinian Granites in Hongshishan Area,Gansu Province and Discussion on Its Genesis[J].Northwestern Geology,2011,44(1):10-19. | |
| Authors: | HUANG Zeng-bao JIN Xia LI Bao-hua WEI Zhi-jun |
| Institution: | HUANG Zeng-bao1,2,JIN Xia2,LI Bao-hua1,WEI Zhi-jun(1.College of Earth Sciences,Chengdu University of Technology,Chengdu 610059,China,2.Geological Survey of Gansu Province,Lanzhou 73000,China) |
| Abstract: | The Indosinian granites are located in the ophiolite magmatitic complex of Hongshishan belt,Gansu.It consists of three complexes:North Maanshan complex,Xiaocaohu Lake complex,and Hongshishan complex,including granodiorite,tonalite,and syenogranite;they also contain many xenoliths composed by amphibolitie inclusions and dark microgramular mafic inclusions.Its isochronal age is 237.8 to 240 Ma,indicating that the emplacement occurred in Middle Triassic.According to the geological characteristic,petro-chemistr... |
| Keywords: | genesis Indosinian granites Hongshishan area adakitic-like rocks low-Sr and Y type granitoids |
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