当前位置: X-MOL 学术J. South Am. Earth Sci. › 论文详情
Early stages of the Miocene magmatic arc and related hydrothermal alteration at Valle Hermoso, South Central Andes (35°07′S, 70°17′W)
Journal of South American Earth Sciences ( IF 1.704 ) Pub Date : 2020-01-30 , DOI: 10.1016/j.jsames.2020.102508
Patricia Sruoga, Martín Gozalvez, Cintia Marquetti, Mariela P. Etcheverría, José F. Mescua, Angel Jara, Noelia Iannizzotto, Bradley S. Singer, Brian R. Jicha

For the first time, the eastern flank at Cordón Santa Elena, within the Valle Hermoso district, has been mapped and described in detail. Based on key field observations, petrographic, geochemical and geochronological results, a new Miocene volcanic stratigraphy is proposed for this particular area. The Cordón del Burrero Group (Arroyo del Perdido, Puesto Gutiérrez, Bolchiquito and Santa Elena Formations) has been defined for the ~18-13 Ma timespan, whereas the Huincan Formation has been constrained as younger than ~11 Ma. According to La/Yb ratios, Cordón del Burrero volcanics have been emplaced in a relatively thin crust compared to the Huincan dacites, suggesting that the main phase of crust thickening and tectonic deformation took place at ~12-11 Ma. The studies carried out at Cordón Santa Elena revealed a spatial and genetic relationship between the ~13 Ma dioritic subvolcanic pluton and a widespread calcic-sodic hydrothermal alteration. The areal distribution of the hydrothermal alteration shows a core of calcic-sodic alteration accompanied by propylitic alteration, cut by quartz-pyrite veins spatially associated with phyllic alteration and restricted potassic alteration. This hydrothermal system may be considered as the oldest pulse at this latitude.

更新日期:2020-01-30

 

全部期刊列表>>
物理学研究前沿热点精选期刊推荐
chemistry
自然职位线上招聘会
欢迎报名注册2020量子在线大会
化学领域亟待解决的问题
材料学研究精选新
GIANT
ACS ES&T Engineering
ACS ES&T Water
ACS Publications填问卷
屿渡论文,编辑服务
阿拉丁试剂right
南昌大学
王辉
南方科技大学
彭小水
隐藏1h前已浏览文章
课题组网站
新版X-MOL期刊搜索和高级搜索功能介绍
ACS材料视界
天合科研
x-mol收录
X-MOL
苏州大学
廖矿标
深圳湾
试剂库存
down
wechat
bug