Mineral Compositions and P-T Conditions of the Blueschist-Mica Schist in Heilongjiang Complex
详细信息
- 责任者：Li Rong (College of Earth Sciences ; Jilin University ; Changchun 130061 ; China) ; Sun Deyou
- 刊名：Earth Science
- 出版年：2013
- 卷期：38(2)
- 关键词：杂岩 ; complexes ; 蓝片岩 ; blueschist ; 温压条件 ; P-T conditions ; 黑龙江省 ; Heilongjiang Province
- 页码：p.277-288
- 图表：illus., 5 tables, 25 refs.
- 分类号：0802
- issnNo：ISSN1000-2383
- isbnNo：CN42-1233/P
摘要
A sequence of middle-high-pressure metamorphic rocks occurs in the Heilongjiang Complex, whose representative lithology is blueschist and mica schist. Characteristic minerals of middle-high-pressure metamorphism, such as glaucophane, ferro-glaucophane and phengite (Si=3.37 to 3.46>3.30) are observed in the metamorphic rocks. The rock association, blueschist and mica schist, has suffered at least two stages of metamorphism. The P-T conditions are estimated to be 320 to 460 ℃ and 7.8×108 to 11×108 Pa, which correspond to early stage epidote-blueschist facies. The late stage is high-greenschist facies, which is characterized by the replacement of glaucophane and phengite by magnesium-rich (XMg=0.565 to 0.646) chlorite. The metamorphic conditions constrained by garnet mica schist are 536～598 ℃ and 6.8×108 to 9.5×108 Pa, consistent with medium temperature and middle-high pressure metamorphism.
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