内蒙古喀喇沁地区早中生代闪长岩中麻粒岩捕虏体矿物化学及变质温压条件

韩庆军; 邵济安

内蒙古喀喇沁地区早中生代闪长岩中麻粒岩捕虏体矿物化学及变质温压条件

韩庆军¹,
邵济安²

1.
中国科学院地质与地球物理研究所，北京 100029
2.
北京大学地质系，北京 100871

基金项目:

国家自然科学基金项目 49672156

国家自然科学基金项目 49872079

详细信息

作者简介:
韩庆军，男，博士生，1973年生，主要从事构造地质学研究

中图分类号: P585.3;P588.3
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出版历程
- 收稿日期: 1999-06-15
- 刊出日期: 2000-01-25

MINERAL CHEMISTRY AND METAMORPHIC p-t CONDITIONS OF GRANULITE XENOLITHS IN EARLY MESOZOIC DIORITE IN HARKIN REGION, EASTERN INNER MONGOLIA AUTONOMOUS REGION, CHINA

HAN Qing-jun¹,
SHAO Ji-an²

1.
Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China
2.
Department of Geology, Peking University, Beijing 100871, China

摘要

摘要: 在内蒙古东部喀喇沁地区早中生代大营子闪长岩中首次发现基性麻粒岩捕虏体.初步研究表明它们不同于华北克拉通地表出露的前寒武纪麻粒岩.根据其主要造岩矿物斜方辉石、单斜辉石、黑云母及斜长石的电子探针分析结果, 重点研究了各主要造岩矿物的化学成分特点, 并讨论了麻粒岩捕虏体的变质作用温压条件.研究结果表明, 捕虏体岩石的变质作用已达麻粒岩相, 其变质作用条件约为850~900 ℃, 0.6~1.0 GPa.这些麻粒岩捕虏体反映了研究区早中生代下地壳的组成特点, 为恢复该区早中生代深部地壳结构提供了依据.
- 麻粒岩 /
- 捕虏体 /
- 矿物化学 /
- 早中生代 /
- 内蒙古东部
Abstract: The mafic granulite xenolith was first reported to have occurred in Early Mesozoic diorite in Harkin region, Eastern Inner Mongolia Autonomous Region, China. The preliminary research indicates that the basic granulite xenoliths are different from the Precambrian granulite exposed on the earth surface of the North China craton. The electron microprobe analysis was performed of the four main rock-forming minerals: orthopyroxene, clinopyroxene, biotite and plagioclase, in comparison with those of Precambrian granulite terrain. The major focus is on the research into the chemical composition of various major rock-forming minerals. In addition, the metamorphic p-t conditions for the granulite xenoliths are discussed. The research results show that the metamorphism of the xenoliths had reached the granulite facies at the metamorphic temperatures ranging from 850 ℃ to 900 ℃ and at the metamorphic pressures ranging from 0.6 GPa to 1.0 GPa. These mafic granulite xenoliths reflect the component features of the Early Mesozoic continental lower crust of the research region, providing some evidence for the reconstruction of the Early Mesozoic deep crustal structure.
- granulite /
- xenolith /
- mineral chemistry /
- Early Mesozoic /
- Eastern Inner Mongolia Autonomous Region

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图 1 喀喇沁旗大营子地区地质简图

1.太古宙片麻岩; 2.元古宙; 3.二叠纪花岗岩; 4.燕山期花岗岩; 5.早中生代闪长岩; 6.辉长岩; 7.辉石岩、苏长岩、斜长岩及角闪岩; 8.麻粒岩捕虏体采样点; 9.断层、推测断层及构造破碎带

Fig. 1. Geological sketch map of Dayingzi area in Harkin County

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图 2 麻粒岩捕虏体中辉石成分的w(Di)-w(Hd)-w(En)-w(Fs)图^[2]

●单斜辉石; ○斜方辉石; A.透辉石; B.次透辉石; C.顽透辉石; D.普通辉石; 1, 2分别为与贫钙辉石共存的麻粒岩和火成岩单斜辉石的趋势线^[3]

Fig. 2. w(Di)-w(Hd)-w(En)-w(Fs) diagram of pyroxenes in granulite xenoliths

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图 3 麻粒岩捕虏体中辉石及黑云母的w(MgO)-w(FeO)变异

+前寒武纪地体麻粒岩; ○汉诺坝玄武岩中麻粒岩捕虏体; ●本区麻粒岩捕虏体; △堆晶岩捕虏体; □澳洲北昆士兰麻粒岩捕虏体; ◇山东金伯利岩

Fig. 3. w(MgO)-w(FeO) diagrams of pyroxene and biotite in granulite xenoliths

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图 4 麻粒岩捕虏体单斜辉石的w(TiO₂)-w(Al₂O₃) 和[w(Si) +w(Al)]- w(Al₂O₃) 图解

a.变质成因; b.岩浆成因

Fig. 4. w(TiO₂)-w(Al₂O₃) and [w(Si) +w(Al)]-w(Al₂O₃) diagrams of clinopyroxenes in granulite xenoliths

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图 5 麻粒岩捕虏体中黑云母w(TiO₂)-100 w(Fe)/[w(Fe)+w(Mg)]图解

Fig. 5. w(TiO₂)-100w(Fe)/[w(Fe)+w(Mg)] diagram of biotite in granulite xenoliths

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表 1 基性麻粒岩捕虏体主要造岩矿物的平均化学成分及变质温度

Table 1. Compositions of main rock_forming minerals in mafic ganulite xenoliths and equilibrated temperatures

表 2 麻粒岩捕虏体与华北克拉通前寒武纪地体麻粒岩中辉石矿物平均成分比较

Table 2. Comparison of pyroxene compositions in granulite xenoliths with those in Precambrian granulite terrane from North China craton

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