Hostname: page-component-cd9895bd7-7cvxr Total loading time: 0 Render date: 2024-12-25T08:07:16.339Z Has data issue: false hasContentIssue false
  • English
  • Français

Geochemistry of late Mesozoic lamprophyre dykes from the Taihang Mountains, north China, and implications for the sub-continental lithospheric mantle

Published online by Cambridge University Press:  17 March 2003

B. CHEN  and
M. ZHAI
B. CHEN
Affiliation:
Department of Geology, Peking University, Beijing 100871, China Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China
M. ZHAI
Affiliation:
Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China
Get access Rights & Permissions [Opens in a new window]

Abstract

Many late Mesozoic lamprophyre dykes occur in the Taihang Mountains (north China). These lamprophyres are rich in large ion lithophile elements (e.g. Rb, Sr, Ba and K) and light REE, and have highly differentiated REE patterns. They show large but regular variations in chemical and Nd–Sr isotopic compositions. All these suggest that the lamprophyres were produced from differentiation of a parental magma, coupled with contamination by lower crust. The parental magma was derived from melting of a long-term enriched sub-continental lithospheric mantle source as is indicated by the highly enriched isotopic signatures of the lamprophyres. Mantle enrichment in the area was probably produced by interaction of volatile-rich melts released from the asthenosphere with the above lithosphere in middle Proterozoic times.

Keywords

geochemistrylamprophyreslithosphereMesozoicnorthern China
Type
Research Article
Information
Geological Magazine , Volume 140 , Issue 1 , January 2003 , pp. 87 - 93
Copyright
© 2003 Cambridge University Press

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)