The Nigerian igneous rocks described in this thesis are the Younger Granites from Northern Nigeria. The granites are sub-divided into four groups, namely, the early granites and porphyries group; the biotite-granite-group; the riebeckiteblotite- granite group and the riebeckite-granite group and, analysed for trace elements by various techniques. The distribution of Li, F, Ga, Rb, Sr, Y, Zr, Nb, Sn, Ba, La, Yb and Pb in over 70 specimens is discussed to characterise the granite groups. The early granites and porphyries group always contains lower trace element concentrations of Li, F, Rb, Y, Nb, Sn, Yb, and Pb than the biotite-granite group, the riebeckitebiotite- granite group or the riebeckite-granite group. concentrations of Li, Rb, Y, Nb, and Yb are similar in the biotite-granite group and the riebeckite-granite group (exeluding the albite-riebeckite-granites), but the contents of F, Zr and (Sn) can be used to distinguish between the granite groups. The albite-riebeckite-granites (especially those from Amo Rop and Liruei) are unique in their concentrations of Li, V, Ga., Rb, Y, Nb, Sn and Yb. More significant trends do occur in individual ring structures though the range of values varies from complex to complex. An attempt is also made to interpret the cycle of magmatic evolution and Ga, lib and Zr are the most useful element:3 in elucidating some aspects of this process.
| Identifer | oai:union.ndltd.org:bl.uk/oai:ethos.bl.uk:602145 |
| Date | January 1962 |
| Creators | Bowden, Peter |
| Publisher | Imperial College London |
| Source Sets | Ethos UK |
| Detected Language | English |
| Type | Electronic Thesis or Dissertation |
| Source | http://hdl.handle.net/10044/1/13613 |
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