U.S.-Argentina Cooperative Research: The Hydrogeochemistry of Copahue Volcano, Province of Neuquen, Argentina

该提案请求为康涅狄格州卫斯理大学的约翰·瓦雷坎普博士和约翰·瓦雷坎普博士之间的合作研究项目提供资金。Daniel H. Delpino，内乌肯省科技主任，COPADE。阿根廷的Neuquen和CONICET的Adriana Bermudez博士。他们将对位于安第斯山脉东部的科帕韦火山的水文地球化学进行研究。这座火山有一个广泛的酸性热液系统，有一个火山口湖，酸性泉从深处吸取液体，在它的东北侧面有一个地热系统。热液流体酸化了一条大河，即里约热内卢Agrio河和冰川湖Caviahue。研究的主要目标包括描述火山流体的化学成分，火山口湖和酸化流域的水/岩石相互作用过程，定量通过里约热内卢Agrio的元素通量，以及评估科帕韦周围的火山危害。研究人员还计划建立一个湖泊爆炸的理论模型，以研究火山爆发的本质。火山-岩浆热液系统的性质及其与大气水的相互作用是矿床沉积研究的一个重要领域，这些系统的酸性流出物可能对当地流域产生严重影响。综合火山口湖和酸泉的主微量元素和同位素分析，将提供热液系统岩浆脱气和岩石溶蚀速率，以及深部热液流体的同位素特征。这项研究的结果预计将产生非常实用的环境数据，以及火山学意义，将在Neuquen地质博物馆展出。

9813912VarekampThis proposal requests funding for a collaborative research project between Dr. Johan Varekamp, Wesleyan University, Connecticut, and Drs. Daniel H. Delpino, Director of Science and Technology of Neuquen Province, COPADE. Neuquen Argentina, and Dr. Adriana Bermudez, CONICET. . They will conduct a study of the hydrogeochemistry of the Copahue Volcano, located in the eastern Andes. The volcano has an extensive acid hydrothermal system with a crater lake, acid springs that draw fluids from deep sources, and a geothermal system on its NE flank. The hydrothermal fluids acidify a large river, the Rio Agrio, and the glacial lake, Caviahue. The main goals of the research include the description of the chemical composition of the fluids from the volcano, water/rock interaction processes in the crater lake and in the acidified watershed, a quantification of the element fluxes through the Rio Agrio, and an evaluation of volcanic hazards around Copahue. The researchers also plan to create a theoretical model for lake explosions to investigate the nature of eruption triggers. The nature of volcano-magmatic hydrothermal systems and the interactions of these deep fluids with meteoric waters is an important field of study for ore deposition, and the acid effluent of these systems may have a severe impact on local watershed. Comprehensive major and trace element and isotopic analyses of the crater lake and acid springs will provide the rates of magmatic degassing and rock dissolution in the hydrothermal system, as well as the isotopic character of the deep hydrothermal fluids. The results of the study, which is expected to yield very practical data of environmental, as well as volcanological significance, will be displayed at the Neuquen Museum of Geology.