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Comparative Study of Early Mesozoic and Archaean Granulites in Chifeng-jianping Area

Author: LiuDongSheng
Tutor: YangZhongFang；ShaoJiAn
School: Chinese Geology University (Beijing)
Course: Geochemistry
Keywords: Chifeng Jianping Mesozoic granulite xenoliths Archean terranes granulites Comparative study
CLC: P588.3
Type: Master's thesis
Year: 2011
Downloads: 47
Quote: 2
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Abstract


Granulites formed in the lower crust, record the evolution of the tectonic setting of the lower crust and even the crust-mantle boundary, is of great significance for the study of the evolutionary history of the craton. This article was first Chifeng - Jianping two different types of Archean and Mesozoic era, different causes granulites comprehensive comparative study rare is this article Archean granulites and Mesozoic granulites were formed in the North China Craton the formation and destruction of two important stages, so this study the evolutionary history of the North China Craton combination of formation and destruction mechanisms provide some information for the North China Craton. This article through the rocks of Mesozoic and Archean granulite Petrography, geochemistry and geochronology comparative study, found two times granulites in the original rock metamorphic history and metamorphic environment there are significant differences in: 1, deterioration protolith different Mesozoic Ma granulite rock's original rock norite - Fai long heap crystalline rocks, while too ancient linen Reap rock original rock is basalt or TTG series rocks; 2, metamorphic history of different Mesozoic Ma granulite rocks of the original rock is diagenetic shortly after igneous rocks, metamorphic starting at a higher temperature and pressure conditions experienced isobaric cooling process of the formation of the high-pressure granulite, after being brought to dioritic magma in the upper crust of the process superimposed a low-pressure granulite facies metamorphism. The entire metamorphic process is completed in about 10Ma. The Archean granulite metamorphic evolution of the history of more complete. Archean strata is composed of a set of basalt or the TTG series of rock deterioration object, along with the Archean strata of the depth of role, superimposed over the same period of magmatism, under the pressure of a certain depth, experienced a slow warming and processing pressure process, the occurrence of the regional metamorphism, after accompanied uplifting, retrograde metamorphism; metamorphic environment Mesozoic granulite entire metamorphic evolution history of in a higher temperature environment carried out. The two pyroxene deterioration thermometer calculated results show that the Mesozoic granulite metamorphic temperatures up to 1090 ° C, the the Archean metamorphic temperatures up to 935 ° C. Since the fluid level of participation is different in the two types of granulite protolith mineral composition differences lead to its deterioration process. The low participation of Mesozoic granulite metamorphic evolution of the process fluid, while the Archean granulite metamorphic processes in fluid precipitation and metamorphic hornblende reaction; different tectonic setting Early Mesozoic Underplating of basaltic magma under the crust add tremendous heat provides the conditions for the formation of granulites. Archean granulite protolith formed in the initial rift intracontinental environment, accompanied by large-scale volcanic sedimentation due to continental collision and crustal thickening caused by thermal metamorphism after formation of the article discusses the Archean granulites . The Mesozoic extensional tectonic setting and the extrusion of Archean made the different backgrounds of the mountain, to determine the differences of the two types of granulites.

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CLC: > Astronomy,Earth Sciences > Geology > Petrology > Classification of rocks > Metamorphic
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