Petrology of Blueschists of Heilongjiang Complex in Northeast China

• 责任者：Volkova N.I.(Institute of Geology and Mineralogy ; Siberian Branch of Russian Academy of Sciences ; Novosibirsk 630090 ; Russia) ; Li Youzhu
• 刊名：Journal of Earth Sciences and Environment
• 出版年：2010
• 卷期：32(2)
• 关键词：蓝闪石片岩 ; glaucophane schist ; 岩石学 ; petrology ; 黑龙江省 ; Heilongjiang Province
• 页码：p.111-119
• 图表：8 illus., 3 tables, 22 refs.
• 分类号：0802
• issnNo：ISSN1672-6561
• isbnNo：CN61-1423/P

 The Heilongjiang Complex contains blueschists composing of epidote, chlorite, albite, sodic amphibole, phengite, quartz, with minor amounts of titanite, ilmenite, and stilpnomelane. Sodic amphiboles are glaucophane to magnesioriebeckite. The Pressure(P)-Temperature(T) metamorphic conditions are estimated to be 400~425 ℃ and 0.69~0.86 MPa, which correspond to epidote-blueschist facies. Geochemical study of blueschists from the Heilongjiang Complex showed that their protoliths were oceanic basalts, which were comparable with oceanic island basalt (OIB) or some types of basalts from plume-influenced regions (E-MORB).This suggests the formation of basalt protolith of the Heilongjiang blueschists from enriched source in seamount or oceanic uplift setting.