| 单词 |
Shamvaian |
| 释义 |
Shamvaian, a. Geol.|ʃæmˈvaɪən|
[f. Shamva + -ian.]
Of or pertaining to rocks in the vicinity of Shamva, a town in northern Zimbabwe; spec. the epithet of a Pre-Cambrian mountain-building episode in southern Africa when these were affected.
1947A. M. Macgregor in Bull. S. Rhodesian Geol. Surv. No. 38. 8 Although the Shamva Grits of the Mazoe Valley were not the first to be described they occupy the largest continuous area... The name ‘Shamvaian’ is proposed. Ibid. 15 The Shamvaian rocks of the Bembesi valley are generally similar to the upper series at Que Que. 1951Trans. Geol. Soc. S. Afr. LIV. p. xxix, The largest area of these rocks..is that of the Shamva grits in the Mazoe Valley which is selected as the type area of the Shamvaian system. 1964A. E. Phaup in S. H. Haughton Geol. Ore Deposits S. Afr. II. 2 Some reefs may be pre-Bulawayan and pre-Shamvaian in age, but the majority are post-Shamvaian. 1971I. G. Gass et al. Understanding Earth xxii. 317/1 At least seven major mountain-building events (periods of orogenesis) are recorded in Africa and are..(ii) 2500–2800 million years ago (Shamvaian orogeny); [etc.]. |
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