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首页> 外文期刊>Journal of Volcanology and Geothermal Research >High-resolution K-Ar dating of a complex magmatic system: The example of Basse-Terre Island (French West Indies)
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High-resolution K-Ar dating of a complex magmatic system: The example of Basse-Terre Island (French West Indies)

机译：复杂岩浆系统的高分辨率K-Ar测年：以Basse-Terre岛为例（法属西印度群岛）

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For the first time in the Lesser Antilles volcanic arc, we combine for one island, 123 K-Ar ages, with 133 major and trace elements geochemical analyses, in order to better constrain the volcanic history of Basse-Terre Island. In this study, nine new ages have been obtained from the southern part of the island, and complemented with eighty-three new major and trace element analyses of samples collected across the island. The southern part of Basse-Terre Island has been the loci of volcanic activity since the last 200 kyr. It is characterized by the construction of the Grande-Decouverte Volcanic Complex (GDVC) composed by the Grande-Decouverte - Soufriere (GDS) and the Trois-Rivieres Madeleine Field (TRMF). After the onset of construction at least at 205 +/- 28 ka, the GDVC displays strikingly continuous activity between 140 +/- 13 and 56 +/- 3 ka, followed by a 30 kyr volcanic hiatus, which is coeval with the hiatus also observed for the TRMF activity. Two new ages of 125 +/- 14 and 140 +/- 13 ka obtained on a lava flow from the Grande-Decouverte caldera wall suggest the presence of a depression, resulting of a major flank collapse and/or explosive event, before 140 ka. Finally, a new age of 9 +/- 6 ka, obtained from outcrops exposed on the edge of the Class River, in the north of the GDVC, allows us to calculate channel incision rates between 11 and 56 mm/yr. These values are consistent with incision rates determined on other volcanic islands with similar climates.
机译：为了更好地限制巴斯-特雷岛的火山历史，我们首次在小安的列斯群岛的火山弧中结合了一个123 K-Ar年龄的岛屿，并进行了133个主要和微量元素的地球化学分析。在这项研究中，从该岛的南部获得了九个新年龄，并对该岛上采集的样品进行了八十三种新的主要和微量元素分析。自上一个200年以来，巴斯岛（Basse-Terre Island）的南部一直是火山活动的所在地。它的特点是由大德库维特-苏弗里耶尔（GDS）和三河三峡马德琳油田（TRMF）组成的大德库维特火山综合体（GDVC）。至少在205 +/- 28 ka上开始施工后，GDVC在140 +/- 13和56 +/- 3 ka之间显示出惊人的连续活动，随后是30 kyr的火山裂隙，与裂隙同时存在观察到TRMF活性。从格兰德-德库维特火山口壁的熔岩流中获得的两个新年龄分别为125 +/- 14和140 +/- 13 ka，这表明在140 ka之前存在凹陷，这是由于主要的侧面崩塌和/或爆炸事件引起的。最后，从GDVC北部Class River边缘裸露的露头获得的9 +/- 6 ka的新年龄，使我们能够计算出11至56 mm / yr的河道切入速率。这些值与在其他具有类似气候的火山岛上确定的切开率一致。

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