The Discovery of Neoproterozoic Pillow Lava in Spilite-Ceratophyre of Lushan Area, Northern Jiangxi Province, and Its Geological Significance

• 责任者：Dong Shuwen (Chinese Academy of Geological Sciences ; Beijing 100037 ; China) ; Xue Huaimin
• 刊名：Geology in China
• 出版年：2010
• 卷期：37(4)
• 关键词：细碧岩 ; spilite ; 角斑岩 ; keratophyre ; 熔岩 ; lava ; 庐山 ; Lushan Mountains
• 页码：p.1021-1033
• 图表：7 illus., 2 tables, 37 refs.
• 分类号：0801
• issnNo：ISSN1000-3657
• isbnNo：CN11-1167/P

Recently, the authors found a suite of spilite-ceratophyre with pillow structure in strata of Shuangqiaoshan Group. An analysis of element geochemistry reveals that the spilite-ceratophyre and the concomitant dacite have the characteristics of oceanic island basalt, hence their formation environment should have been a back-arc small oceanic basin upside continental crust. The authors thus hold that the suture of southern Jiangxi (Shexian County) had an approximately EW strike, and extended straight forward to Lushan area of northern Jiangxi, whereas the Jiangnan orogen remained not closed from 830 Ma to 850 Ma. It is also held that the Shuangqiaoshan Group is a component part of the basement of “poly-basement with one cover” in the middle-lower Yangtze block.