δ18O and δD variations in some volcanic lakes on the Cameroon Volcanic Line (West-Africa): generating isotopic baseline data for volcano monitoring and surveillance in Cameroon
δ18O and δD variations in some volcanic lakes on the Cameroon Volcanic Line (West-Africa): generating isotopic baseline data for volcano monitoring and surveillance in Cameroon
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喀麦隆火山线（西非）上一些火山湖的 δ18O 和 δD 变化：生成用于喀麦隆火山监测和监视的同位素基线数据
DOI：
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发表时间：
2014
期刊：
影响因子：
--
通讯作者：
M. Kusakabe
中科院分区：
文献类型：
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作者：
Festus Aka Tongwa;Alfred G. Mouliom;D. Rouwet;W. Fantong;B. C. Tchamabé;T. Ohba;Y. Yoshida;D. Sighomnou;N. Sigha;M. Kusakabe
根据地球人类学和地球化学研究，喀麦隆火山线（CVL）沿线的其他 37 个湖泊中的任何一个都可能发生类似于 20 世纪 80 年代中期喀麦隆杀手湖尼奥斯湖和莫翁湖发生的史无前例的瓦斯爆炸的灾难。由于未来人们可能会因可预见的灾难而遭受损失和荒凉，因此必须制定监测/监视政策。由于其位置，火山口湖整合了由于岩浆活动而在地壳中形成的地球化学过程。因此，监测这些深层和/或热液过程的表面表现可能会揭示岩浆活动的增加/减少。火山湖中因与具有特定 δ 18 O 和 δD 成分指纹（岩浆、变质岩等）的外源流体混合而引起的异常变化可用于预测火山灾害。如果清楚地识别并合理地理解了湖泊环境的稳态以及控制其水动力的外部和内在参数，那么就可以识别出损害其稳定性的异常演化过程。本研究试图收集喀麦隆17个湖泊的δ 18 O和δD数据，以帮助建立与火山相关的监测/监视网络。这项工作确定了控制湖泊同位素组成的过程，并评估了内部/内部和空间 δ 18 O/δD 变化。几乎所有的湖泊都含有大气水。这些湖泊大多是同位素分层的；一般来说，精神异常比精神低下更积极。然而，尽管由于纬度效应，从南向北，降雨中的重同位素逐渐减少，但由于蒸发，湖泊变得更加富集（0.6‰/100 km）。评估的几个参数对同位素变化的影响表明，相对于其他因素，水文环境可能发挥重要的作用，尽管不是最重要的。因此，气候学、植物地理学、水文学和形态测量之间的相互作用可能有助于塑造湖泊的同位素组成。
Based on geo-anthropological and geochemical studies, catastrophes similar to the unprecedented gas explosions in the mid-1980s from the Cameroonian k iller lakes Nyos and Monoun, might occur in any of the 37 other lakes located along the Cameroon Volcanic Line (CVL). Because people could suffer loss and desolation from predictable catastrophes in the future, monitoring/surveillance policies must be established. Due to their location, crater lakes integrate the geochemical processes that develop in the Earth’s crust due to magmatic activities. Therefore, monitoring the surface manifestations of those deep seated and/or hydrothermal processes might reveal increases/decreases in magmatic activities. The anomalous changes in a volcanic lake induced by mixing with exogenous fluids that have a specific δ 18 O and δD compositional fingerprint (magmatic, metamorphic, etc .) could be utilized to predict volcanic hazards. If the steady state of a lake environment and the external and intrinsic parameters that control its hydrodynamics are clearly identified and reasonably understood, the anomalous evolutionary processes that compromise its stability can be identified. This study attempts to collect the δ 18 O and δD data from 17 Cameroonian lakes to help establish a volcano-related monitoring/surveillance network. This work identifies the processes that control the isotopic composition of the lakes and assesses the intra-/inter- and spatial δ 18 O/δD variations. Almost all of the lakes contain meteoric water. These lakes are mostly isotopically stratified; epilimnia is generally more positive than the hypolimnia. However, although the rainfall is gradually depleted in heavy isotopes when moving from the South to the North due to the latitude effect , the lakes become more enriched (0.6‰/100 km) due to evaporation. The evaluated impact of several parameters on the isotopic variation suggests that the hydrological setting may play an important, albeit not preeminent, role relative to the other factors. Consequently, the interplay between climatology, phytogeography, hydrology and morphometry might help shape the isotopic composition of the lakes.
阿尔巴诺、阿韦尔诺和蒙蒂基奥半聚火山湖（意大利中部和南部）涉及溶解 CO2 和 CH4 的生物地球化学过程
影响因子：
3.5
作者：
Cabassi;Vaselli;Fiebig;Nocentini;Capecchiacci;Rouwet;Bicocchi
通讯作者：
Bicocchi
影响因子：
5
作者：
Garcin, Yannick;Schwab, Valerie F.;Sachse, Dirk
通讯作者：
Sachse, Dirk