{"title":"Bondoukou (cote d' ivoire)“花岗岩”地块的新岩石学、地球化学和地球年代学数据，通过Rb/Sr等时线显示了整个岩石的burkinian年龄","authors":"S. Toure , M. Caen-Vachette , P. Tempier","doi":"10.1016/0899-5362(87)90068-6","DOIUrl":null,"url":null,"abstract":"<div><p>The locality of Bondoukou, NE of Ivory Coast, gave its name to a granite type, opposite to the Baoulé-type granite in Bodin's classification (1951, <em>Bull. Dir. Mines AOF</em>, Dakar, N° 12). This classification has been progressively enlarged to the whole of West Africa. The Bondoukou granite is subcircular in form, intrusive and discordant in the tufaceous schists and had not been dated previously.</p><p>Recent age determinations on 15 samples from this massif have been done with the Rb/Sr isochron method on whole rocks. The age obtained is approx. 2170 Ma. Consequently, these new data yield a Burkinian age (ex early Eburnean) which was not expected since a lot of works on Birrimian granites of West Africa assigned a post tectonic character and consequently a later age to the Bondoukou granite, related to the Baoulé-type granites.</p><p>Other age determinations with the same Rb/Sr method were done on granitic massifs which were assigned to the Bondoukou type; they yielded ages slightly younger than 2000 Ma in Senegal and Burkina Faso respectively (Bassot, J. P. and Caen-Vachette, M. 1984. In: 12th <em>coll. Inter. Géol. africaine, Bruxelles, et géol. africaine</em> (Edited by Klerkx, J. et Michot, J.),pp. 191–209. Tervuren, Belgique; and Gamsonre, P. E. and Rossy, M. 1974. Esquisse géologique de la région de Ouahi Gouya (N. W. de la Hte Volta). Chronologie des divers types de granitoîdes, p. 181. 2ème Rast, Nancy).</p><p>So, these few results point out the complex position of the Bondoukou type granites. Their meaning in the main Eburnean orogeny must be considered.</p></div>","PeriodicalId":100749,"journal":{"name":"Journal of African Earth Sciences (1983)","volume":"6 3","pages":"Pages 269-274"},"PeriodicalIF":0.0000,"publicationDate":"1987-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0899-5362(87)90068-6","citationCount":"8","resultStr":"{\"title\":\"Nouvelles données pétrographiques, géochimiques et géochronologiques du massif ‘granitique’ de Bondoukou (Côte d'Ivoire) mise en évidence d'un âge Burkinien, par isochrone Rb/Sr sur roches totales\",\"authors\":\"S. Toure , M. Caen-Vachette , P. Tempier\",\"doi\":\"10.1016/0899-5362(87)90068-6\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<div><p>The locality of Bondoukou, NE of Ivory Coast, gave its name to a granite type, opposite to the Baoulé-type granite in Bodin's classification (1951, <em>Bull. Dir. Mines AOF</em>, Dakar, N° 12). This classification has been progressively enlarged to the whole of West Africa. The Bondoukou granite is subcircular in form, intrusive and discordant in the tufaceous schists and had not been dated previously.</p><p>Recent age determinations on 15 samples from this massif have been done with the Rb/Sr isochron method on whole rocks. The age obtained is approx. 2170 Ma. Consequently, these new data yield a Burkinian age (ex early Eburnean) which was not expected since a lot of works on Birrimian granites of West Africa assigned a post tectonic character and consequently a later age to the Bondoukou granite, related to the Baoulé-type granites.</p><p>Other age determinations with the same Rb/Sr method were done on granitic massifs which were assigned to the Bondoukou type; they yielded ages slightly younger than 2000 Ma in Senegal and Burkina Faso respectively (Bassot, J. P. and Caen-Vachette, M. 1984. In: 12th <em>coll. Inter. Géol. africaine, Bruxelles, et géol. africaine</em> (Edited by Klerkx, J. et Michot, J.),pp. 191–209. Tervuren, Belgique; and Gamsonre, P. E. and Rossy, M. 1974. Esquisse géologique de la région de Ouahi Gouya (N. W. de la Hte Volta). Chronologie des divers types de granitoîdes, p. 181. 2ème Rast, Nancy).</p><p>So, these few results point out the complex position of the Bondoukou type granites. Their meaning in the main Eburnean orogeny must be considered.</p></div>\",\"PeriodicalId\":100749,\"journal\":{\"name\":\"Journal of African Earth Sciences (1983)\",\"volume\":\"6 3\",\"pages\":\"Pages 269-274\"},\"PeriodicalIF\":0.0000,\"publicationDate\":\"1987-01-01\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"https://sci-hub-pdf.com/10.1016/0899-5362(87)90068-6\",\"citationCount\":\"8\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Journal of African Earth Sciences (1983)\",\"FirstCategoryId\":\"1085\",\"ListUrlMain\":\"https://www.sciencedirect.com/science/article/pii/0899536287900686\",\"RegionNum\":0,\"RegionCategory\":null,\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"\",\"JCRName\":\"\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Journal of African Earth Sciences (1983)","FirstCategoryId":"1085","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/0899536287900686","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
引用次数: 8
摘要
科特迪瓦东北部的Bondoukou地区以一种花岗岩类型命名，与Bodin的分类(1951,Bull。Dir。非洲矿业大学，达喀尔，第12期。这种分类已逐步扩大到整个西非。本豆口花岗岩为近圆形花岗岩，侵入性强，不协调，在辉灰质片岩中存在，前人未对其进行定年。用Rb/Sr等时线法对该地块的15个样品进行了年龄测定。所得年龄约为。2170 Ma。因此，这些新资料得出了一个Burkinian时代(不包括eburneian早期)，这是预料不到的，因为许多关于西非Birrimian花岗岩的工作都认为Bondoukou花岗岩具有后构造特征，因此与baoul型花岗岩相关的Bondoukou花岗岩年龄更晚。用相同的Rb/Sr方法对花岗岩块体进行了年龄测定，确定为Bondoukou型;分别在塞内加尔和布基纳法索得出的年龄略低于2000岁(Bassot, J. P.和Caen-Vachette, M. 1984)。12年级。国际米兰。青烟。非洲、布鲁塞尔等地。《africaine》(由Klerkx, J.和Michot, J.编辑)，页。191 - 209。坦比连犬,比利时;和Gamsonre, p.e.和Rossy, M. 1974。瓦希·古雅的˙˙˙˙˙˙˙˙˙˙Chronologie des divers types de granite ( des，第181页)。[au:]南希。因此，这几个结果指出了Bondoukou型花岗岩的复杂位置。它们在主要的鄂本造山运动中的意义必须加以考虑。
Nouvelles données pétrographiques, géochimiques et géochronologiques du massif ‘granitique’ de Bondoukou (Côte d'Ivoire) mise en évidence d'un âge Burkinien, par isochrone Rb/Sr sur roches totales
The locality of Bondoukou, NE of Ivory Coast, gave its name to a granite type, opposite to the Baoulé-type granite in Bodin's classification (1951, Bull. Dir. Mines AOF, Dakar, N° 12). This classification has been progressively enlarged to the whole of West Africa. The Bondoukou granite is subcircular in form, intrusive and discordant in the tufaceous schists and had not been dated previously.
Recent age determinations on 15 samples from this massif have been done with the Rb/Sr isochron method on whole rocks. The age obtained is approx. 2170 Ma. Consequently, these new data yield a Burkinian age (ex early Eburnean) which was not expected since a lot of works on Birrimian granites of West Africa assigned a post tectonic character and consequently a later age to the Bondoukou granite, related to the Baoulé-type granites.
Other age determinations with the same Rb/Sr method were done on granitic massifs which were assigned to the Bondoukou type; they yielded ages slightly younger than 2000 Ma in Senegal and Burkina Faso respectively (Bassot, J. P. and Caen-Vachette, M. 1984. In: 12th coll. Inter. Géol. africaine, Bruxelles, et géol. africaine (Edited by Klerkx, J. et Michot, J.),pp. 191–209. Tervuren, Belgique; and Gamsonre, P. E. and Rossy, M. 1974. Esquisse géologique de la région de Ouahi Gouya (N. W. de la Hte Volta). Chronologie des divers types de granitoîdes, p. 181. 2ème Rast, Nancy).
So, these few results point out the complex position of the Bondoukou type granites. Their meaning in the main Eburnean orogeny must be considered.
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