The metamorphic evolution of Salma-type eclogite in Russia: Constraints from zircon/titanite dating and phase equilibria modeling

被引：17

作者：

Yu, Huanglu ^{[1
]}

Zhang, Lifei ^{[1
]}

Zhang, Lijuan ^{[1
]}

Wei, Chunjing ^{[1
]}

Li, Xiaoli ^{[1
]}

Guo, Jinghui ^{[2
]}

Bader, Thomas ^{[1
]}

Qi, Yunfei ^{[1
]}

机构：

[1] Peking Univ, Sch Earth & Space Sci, MOE Key Lab Orogen Belt & Crustal Evolut, Beijing 100871, Peoples R China

[2] Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing 100029, Peoples R China

来源：

PRECAMBRIAN RESEARCH | 2019年 / 326卷

关键词：

Salma-type eclogite; Zircon age; Titanite age; Phase equilibria modeling; Clockwise P-T path; BELOMORIAN MOBILE BELT; U-PB AGE; PARTIAL MELTING EQUILIBRIA; HIGH-GRADE METAMORPHISM; TIANSHAN OROGENIC BELT; TECTONIC EVOLUTION; GRANULITE-FACIES; PALEOPROTEROZOIC ECLOGITES; UHP METAMORPHISM; KARELIAN CRATON;

D O I：

10.1016/j.precamres.2018.01.019

中图分类号：

P [天文学、地球科学];

学科分类号：

07 ;

摘要：

Combined geochronology with phase equilibria modeling, the P-T-t evolution of metamorphic rocks can be deciphered. Four different representative samples, including retrogressed eclogite, garnetite, paragneiss and tonalite-trondhjemite-granodiorite (TTG) gneiss have been selected for detailed petrography and U/Pb dating from the Belomorian Eclogite Province in Russia. Zircon cores yield Archean ages for the protoliths of these samples. Zircon rims of the TTG gneiss have recorded Neoarchean anataxis at ca 2.73 Ga, whereas 1.91-1.92 Ga zircon rims of the garnetite and the paragneiss have dated high-pressure granulite facies metamorphism. Titanite in the retrogressed eclogite has recorded amphibolite facies retrogression at ca 1.86 Ga. Phase equilibria modelings for retrogressed eclogite, garnetite, and paragneiss define P-T conditions of 17-18 kbar/below 790 degrees C for the peak eclogite facies metamorphism, 11-12 kbar/870-900 degrees C for the high-pressure granulite facies metamorphism, and 8-10 kbar/650-710 degrees C for titanite's stability which corresponds to the amphibolite facies metamorphism. A clockwise P-T path is inferred for the Salma-type eclogite, which is characterized by thermal relaxation from the peak eclogite facies to the high-pressure granulite facies, and nearly isobaric cooling from the high-pressure granulite facies to the amphibolite facies.

引用

页码：363 / 384

页数：22

共 76 条

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