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Study on Metamorphism-Deformation of Metamorphic Rock Series of Jiageda Formation, Manzhouli-E’ergona Region

Author: DingXue
Tutor: ZhengChangQing
School: Jilin University
Course: Mineralogy,petrology, Mineral Deposit Geology
Keywords: Jiagedanzu Rock series Qualitative deformation Chau inside - Ergun
CLC: P588.3
Type: Master's thesis
Year: 2010
Downloads: 86
Quote: 2
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Abstract


Manzhouli - Ergun good pimple jaundice Group metamorphic rocks geological features and output position, a detailed investigation, a systematic study of rocks of the metamorphic rocks of a good pimple jaundice group, rock characteristics, geochemistry characteristics of the formation of age, recovery characteristics and tectonic setting of the original rock, a good pimple jaundice group magma metamorphic rocks - metamorphic - the evolution of tectonic deformation sequence and its tectonic significance. Metamorphic rocks of the study area good pimple jaundice group The rock types pomegranate Cross biotite schist, biotite hornblende schist, amphibolite, plagioclase, biotite, granodiorite gneiss and mylonite, two-mica quartz schist and fine-grained biotite granite. Pomegranate Cross biotite schist Vice metamorphic rocks, its provenance magmatic rocks formed at 361.0 ± 4.7Ma. Biotite hornblende schist, amphibolite, plagioclase, biotite, granodiorite gneiss and mylonite, two-mica quartz schist are positive metamorphic respectively to 360.0 320.0Ma and 300.0Ma, 211.0 to 148.0 Ma magmatism and metamorphism and deformation of the product. The major two metamorphism and a ductile deformation, metamorphism, the equivalent of the intermediate area of ??the first phase of metamorphism of argillaceous sedimentary rocks in p / T facies series low amphibolite facies; Phase II metamorphism of the massive gneissosity and foliated and mafic rocks are intermediate regional metamorphism; later a deformation ductile deformation, the formation of local strong deformation bands, performance is strongly foliated rock Mi mylonite, measured two groups mica Ar-Ar age of 130.9 ± 1.4Ma, 142.3 ± 1.6 Ma. The geochemical study results show that the granodioritic mylonite and two-mica quartz schist LREE enrichment, heavy rare earth losses, there has been a certain degree of negative Eu anomalies, both REE distribution characteristics and crustal melting type granite characteristics were similar; the granodioritic gneiss REE distribution curve is obvious fractionation of light rare earth, rare earth fractionation is not obvious, and no negative Eu anomalies, REE distribution characteristics of granite with a granite formation. Granodiorite gneiss, mylonite and two-mica quartz schist trace element distribution curve was rightist trend overall, both losses Sr, P and Ti element, enriched in elements such as Rb, Th, Nd, which reflects the continent The trace element characteristics of arc background made of granite. In summary, the oldest rocks in the study area is not Precambrian metamorphic basement outcrop, but the Hercynian Yanshanian orogeny formed orogenic granite, belong to the continental margin hyperplasia construction, while the so-called \Group metamorphic rocks of pimple jaundice set \

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