MARGIN: 0cm 0cm 0pt; mso-pagination: widow-orphan; mso-margin-top-alt: auto; mso-margin-bottom-alt: auto; mso-outline-level: 2" class=MsoNormal>mso-font-kerning: 18.0pt; mso-bidi-font-family: 宋体" lang=EN-US>Geochemistry and Tectonic Setting of Lavas from Shijihe Area in ml:namespace prefix = st1 ns = "urn:schemas-microsoft-com:office:smarttags" />me w:st="on">Westernme> me w:st="on">Northme> me w:st="on">Qilianme> Mountainsml:namespace prefix = o ns = "urn:schemas-microsoft-com:office:office" />

• 责任者：Liu Xiaohuang (State Key Laboratory of Geological Processes and Mineral Resources ; China University of Geosciences ; Beijing 100083 ; China) ; Deng Jun
• 刊名：Earth Science
• 出版年：2010
• 卷期：35(6)
• 关键词：火山岩 ; volcanic rocks ; 岩石地球化学 ; lithogeochemistry ; 地球动力学 ; geodynamics ; 祁连山 ; Qilian Mountains
• 页码：p.959-968
• 图表：6 illus., 2 tables, 59 refs.
• 分类号：0801
• issnNo：ISSN1000-2383
• isbnNo：CN42-1233/P

MILY: ’Times New Roman’; FONT-SIZE: 14pt; mso-font-kerning: 1.0pt; mso-fareast-font-family: 宋体; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA" lang=EN-US> hDivSummary name="EnDivSummary">Recent studies showed that the Shijihe area is an important polymetallic metallogenic belt in western part of ml:namespace prefix = st1 ns = "urn:schemas-microsoft-com:office:smarttags" />me w:st="on">Northme> me w:st="on">Qilianme> Mountains in China. However, geological study degree is very low due to its remoteness and poor conditions. The Lavas of Shijihe area consists of actinolitite hornstone and spilite. The geochemical characteristics of metamorphic basic lava with flat REE distribution patterns, the contents of HFSE similar to N-MORB and εNd(0)=+9.03~+9.42 ( except the sample 08p1) manifest that the rocks belong to the tholeiitic basalt series. Sr isotope characteristics indicate that Sr isotopic composition of the rocks was altered because of the metamorphism of the rock instead of the interfused crust. Sm-Nd isochron age is (481±20) Ma.