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Metamorphic Characteristics and Tectonic Significance of Amphibolite of Guanghua Group in Tonghua Area of Jilin, China(PDF)

《地球科学与环境学报》[ISSN:1672-6561/CN:61-1423/P]

Issue:
2017年第03期
Page:
357-374
Research Field:
基础地质与矿产地质
Publishing date:

Info

Title:
Metamorphic Characteristics and Tectonic Significance of Amphibolite of Guanghua Group in Tonghua Area of Jilin, China
Author(s):
ZHONG Ding-ding ZHENG Chang-qing LU Xiao-ping ZHOU Xi-wen XU Jiu-lei ZHOU Xiao SU Xun-xin
1. College of Earth Sciences, Jilin University, Changchun 130061, Jilin, China; 2. Nuclear Industry Geological Bureau of Jilin Province, Changchun 130062, Jilin, China; 3. Institute of Geology, Chinese Academy of Geological Sciences, Beijing 100037, China; 4. Geological Museum of Heilongjiang Province, Harbin 150090, Heilongjiang, China
Keywords:
amphibolite metamorphism phase equilibrium modeling P-T path Guanghua Group island arc basalt North China Craton Jilin
PACS:
P588.3
DOI:
-
Abstract:
There is a set of amphibolite from Shuangmiao Formation of Guanghua Group in Tonghua area of Jilin, which is located in the northern margin of North China Craton. The amphibolite is one of the major metamorphic rocks consisting of Precambrian metamorphic basement. The original rock of amphibolite mainly belongs to subalkaline basalt, which maybe form in the island-arc setting. The amphibolites undergo three stages of metamorphism, including prograde, peak and retrograde stages. Mineral assemblage at prograde stage is Gt1+Hbl1+Pl1(the value of An is 13-16)+Q, and the pressure and temperature are 4.7-5.2 kbar and 544 ℃-555 ℃; mineral assemblage at peak stage is Gt2+Hbl2+Pl2(the value of An is 28-31) +Ilm2+Bt2+Q, and the pressure and temperature are 8.1-8.8 kbar and 655 ℃-673 ℃; mineral assemblage at retrograde stage is Gt3+Chl+Ath+Hbl3+Bt3+Ilm3+Pl3(the value of An is 16-18)+Q, and the pressure and temperature are 7.9-8.3 kbar and 546 ℃-557 ℃.The metamorphic evolution process of amphibolite shows the counterclockwise P-T path, which is characterized by near-isobar cooling (IBC) processes. It is suggested that there is a tectonic evolution from ArcheanPaleoproterozoic proto-ocean to collision of orogeny, and then orogenic taper, and the last magmatic undergrowth in Tonghua area of Jilin, China

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Last Update: 2017-06-05