Hydrothermal eruptions at El Humazo, Domuyo geothermal field, Argentina: Insights into the eruptive dynamics and controls

PÁEZ, G. N.; LÓPEZ, L.; HERNANDO, I. R.; KÜRTEN, G.; D'ELIA, L.; PETRINOVIC, I. A.; VIGIANI, L.

JOURNAL OF VOLCANOLOGY AND GEOTHERMAL RESEARCH

ELSEVIER SCIENCE BV

Año: 2020 vol. 393 p. 1 - 20

0377-0273

Hydrothermaleruptions are explosive events driven by the sudden and violentvaporization of the water present in many hot water geothermal fieldworldwide. In the last years, thermodynamical conditions of fluidsand petrophisical-geomechanical features of host-rocks, werementioned as responsible of the wide range of eruptive styles anddeposits of hydrothermal eruptions. Nevertheless, the comparisonbetween geological and historical records show that PDC and falloutprocesses are underestimated as common processes linked tohydrothermal eruptions. This paper, from a multi-disciplinaryapproach ?virtual outcrops modeling, sedimentology, petrographicand DRX studies, facies modeling, writing source analysis, andsequence stratigraphy approach? the pristine Holocene?historichydrothermal eruptive record of El Humazo manifestation (DomuyoGeothermal Field, Patagonia, Argentina) was analyzed. To differenteruptive scenarios, devised from high resolution stratigraphy,Weshow how diverse eruptive dynamic characterized by ballisticejection PDC and/or fallout mechanism with discernibletefra-composition and granulometry , associated with excavational oraggradational forms, are controlled by pre-eruptive internal andexternal factors, such as reservoir energy, explosion/fragmentationlevels, physical properties and structural anisotropy of host-rocksand eruptive center migrations. We expect that the contributions ofthis work are not only useful to the buildingof scientific knowledge related to the case study, but also, in theunderstanding of volcanic hazard analysis of geothermal fields.p { margin-bottom: 0.25cm; direction: ltr; color: #00000a; line-height: 115%; orphans: 2; widows: 2 }p.western { font-family: "Calibri", sans-serif; font-size: 11pt; so-language: en-US }p.cjk { font-family: "Droid Sans", "Times New Roman", serif; font-size: 11pt; so-language: zh-CN }p.ctl { font-family: "Calibri", sans-serif; font-size: 11pt; so-language: ar-SA }a:link { color: #0000ff }