publication . Research . 2009

Sr–Nd isotopic compositions of Paleoproterozoic metavolcanic rocks from the southern Ashanti volcanic belt, Ghana

Dampare, Samuel; Shibata, Tsugio; Asiedu, Daniel; Okano, Osamu; Manu, Johnson; Sakyi, Patrick;
Open Access English
  • Published: 25 Dec 2009 Journal: Okayama University Earth Science Report, volume 16, issue 1, pages 9-28 (issn: 1340-7414, Copyright policy)
  • Publisher: 岡山大学理学部地球科学教室
Abstract
Neodymium (Nd) and strontium (Sr) isotopic data are presented for Paleoproterozoic metavolcanic rocks in the southern part of the Ashanti volcanic belt of Ghana. The metavolcanic rocks are predominantly basalts/basaltic andesites and andesites with minor dacites. Two types of basalts/basaltic andesites (B/A), Type I and Type II, have been identified. The Type I B/A are stratigraphically overlain by the Type II B/A, followed by the andesites and the dacites. The analyzed volcanic rocks commonly have low initial (87)Sr/(86)Sr ratios consistent with previous studies on Paleoproterozoic rocks from the West African craton. The LREE-depleted, tholeiitic Type I B/A exh...
Subjects
free text keywords: Sr–Nd isotopes, petrogenesis, tectonic setting, Birimian metavolcanics, Ashanti volcanic belt
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Research . 2009
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