Date post: | 02-Jun-2018 |
Category: |
Documents |
Upload: | hebert-jhon-rafael-aguilar |
View: | 247 times |
Download: | 0 times |
of 23
8/10/2019 VMS Lecture
1/23
VMS
Llerena De Mendiburu, Joseph Huayta Zuiga, Jayme
Huamani Elard
Juan Jose
UNIVERSIDAD NACIONAL DE SAN AGUSTINFACULTAD DE INGENIERIA GEOLOGICA, GEOFISICA Y MINAS
ESCUELA PROFESIONAL DE INGENIERA GEOLOGICA
Agosto 2013
Arequipa-Per
Presentado por:
ACTIVIDADES SEG CHAPTER UNSA
8/10/2019 VMS Lecture
2/23
INDICE
Cap I: Regional Envirom entCap II: Phys ical Volcanolog y of Volcanogenic Mass ive
Sulf ide Deposits
Cap I: Regional Enviroment
Cap I: Hydro thermal A lterat ion
Cap I: Regional Envirom entCap I: Regional Env irom ent
Cap I: Regional EnviromentCap I: Regional Enviroment
Cap I: Regional EnviromentCap I: Regional EnviromentCap I: Regional Enviroment
8/10/2019 VMS Lecture
3/23
CAP I:
Regional Enviroment
Velocid ad de expans in oceni caRpido : 6 to 10]
Mediana: 46 cm /yr largest known v ent f ields 50100 black smokers
Lento: 14 cm/yr low rates of magm a supply
tend to be small because frequent eruptions
8/10/2019 VMS Lecture
4/23
DISTRIBUCIN DE VMS EN EL MUNDO
8/10/2019 VMS Lecture
5/23
STRUCTURAL SETTING
MECANISMOS ACTUANTES EN DMO
8/10/2019 VMS Lecture
6/23
Model for fluid circulation and types of hydrothermal venting related to the
development of detachment faults along slow-spreading mid-ocean ridges. Modified
from McCaig and others (2007). [TAG, Trans-Atlantic Geothermal
IMPORTANCIA DE LOS CONTROLESESTRUCTURALES
8/10/2019 VMS Lecture
7/23
IMPORTANCIA DE LOSCONTROLES ESTRUCTURALES
Conceptual diagram showing the evolution of a caldera-related
submarine magmatic-hydrothermal system. A, Asymmetric collapse of
the caldera allows influx of seawater along opening caldera margin
fault; erupted pyroclastic deposits pond within the developing
asymmetric basin. B, Cold seawater flows downward along outer
inward-dipping faults, while hot mineralizing fluids move up along aseries of outward-dipping faults resulting from piecemeal caldera
collapse. As a result, massive sulfide deposits can form in a number
of locations and possible water depths within the caldera. C, Caldera
resurgence, related to renewed magmatism and intrusion into roofrocks above the main magma chamber, is accompanied by the
formation of tensional faults as the center of the caldera is uplifted.
This permits additional hydrothermal fluid circulation and formation of
additional massive sulfide deposits in the central parts of the caldera.
Modified from Stix and others (2003). [VMS, volcanogenic massive
sulfide; Au, gold; Cu, copper; Zn, zinc]
8/10/2019 VMS Lecture
8/23
IMPORTANCIA DE LOS CONTROLESESTRUCTURALES
STOCKWOKS BRECHOIDES: PERMEABILIDAD, POROSIDAD.
CIRCULACIN DE FLUIDOS.Fotografas representativas de los sulfuros masivos de la Faja Pirtica Ibrica. a. Stockwork en dacita sericitizada infrayacente a los sulfuros
masivos de Cor ta Atalaya, Ro Tinto. b. Stockwork brechoide con fragmentos de riolita silicificada y sopor tada por calcopirita masiva. Cor vo,Neves Cor vo. c. Bandeado y brechas sedimentarias con fragmentos de pizarra en pirita detrtica. Aznalcllar. d. Contacto remplazante de los
sulfuros masivos de La Zarza sobre brechas volcnicas ricas en pmez y vidrio, probablemente facies laterales de un domo. La zona de contacto
est jalonada por una intensa silicificacin rica en oro. e. Sulfuro masivo de grano grueso remplazando a una stockwork anterior desarrollado sobre
dacita silicificada y sericitizada. Cor ta Lago. Ro Tinto. f. Dacita
casi completamente remplazada por sulfuros masivos, quedando nicamente pequeos remanentes de roca caja cloritizada y silicificada. San
Miguel. g. Milonita en la base de la unidad flsica que contiene los sulfuros masivos de Lomero Poyatos. Consiste en una brecha muy silicificada de
fragmentos de roca flsica con lentes de estiradas de sulfuros masivos. h. Estructuras en ramp & flat en el techo de los sulfuros masivos de Aguas
Teidas Este.
8/10/2019 VMS Lecture
9/23
IMPORTANCIA DE LOS CONTROLESESTRUCTURALES
8/10/2019 VMS Lecture
10/23
CONTROLES LITOLGICOS FLUIDOS MINERAL IZADOS NECESITAN DONDE DEPOSITARSE.
APROVECHAN LAS PROPIEDADES FSICAS Y QIMICAS DE LAS ROCAS
EL TIPO DE SECUENCIA ESTRATIGRFICA ESTA SUPEDITADO AL AMB IENTETECTNICO
8/10/2019 VMS Lecture
11/23
CONTROLES L ITOLGICOS
8/10/2019 VMS Lecture
12/23
CONTROLES L ITOLGICOS
8/10/2019 VMS Lecture
13/23
Cap II: Phys ical Volcano logy o f Volcanogenic
Mass ive Sulf ide Deposits
Role of Water in Submarine Volcanism
Water creates a very different set of cond i t ions for submar inevolcanism compared to more frequently observed subaerial
8/10/2019 VMS Lecture
14/23
Role of Water in Submarine Volcanism
8/10/2019 VMS Lecture
15/23
Diagrams showing different types of genetically related and nonrelated
volcanic rocks
8/10/2019 VMS Lecture
16/23
IMPORTANCIA DE CONOCER LAVULCANOLOGA FSICACOMPRENDER LA FORMACIN DE FACIES DE LAVAS ALMUADILLADAS
8/10/2019 VMS Lecture
17/23
FORMACIN DE LAVAS ALMUADILLADAS
Sheeted dikes represent the conduits
transporting magma to the surface to pillow
flows. Typical mineralization in the dikes is
limited and most of the massivesulfide mineralization islocalized in the pillowed
lavas!!!
8/10/2019 VMS Lecture
18/23
FACIES HIALOCLASTITAS
TEXTURA FAVORABLE
mineralization ALSO is localized inHYALOCLASTIC FACIESDEBIDO A SU TEXTURA BRECHOIDE
8/10/2019 VMS Lecture
19/23
Cap. III: Hyd ro thermal alteration
The chem ical and mineralogical distr ibut ion s of
hydroth ermal al terat ion zones are general ly the only direct
evidence of f lu id ci rcu lat ion
recogni t ion o f this arrangement, may provideinformation useful in m ineral explo rat ion
in the field may prov ide important evidence that a
terrane under assessm ent is favorable for
occurrence of VMS depos i ts.
8/10/2019 VMS Lecture
20/23
Hydro thermal al terat ion
8/10/2019 VMS Lecture
21/23
Alteration mineralogy of astockwork zone exposed by
faulting on the Galapagos Rift
Alteration mineralogy at theTAG deposit Honnorez and
others
Hydro thermal alterat ion
8/10/2019 VMS Lecture
22/23
Hydro thermal alterat ion
8/10/2019 VMS Lecture
23/23
Bibliografa
Shanks, W.C. Pat, III, and Thurston, Roland, eds., 2012, Volcanogenic massive
sulfide occurrence model: U.S. Geological Survey Scientific Investigations Report
20105070C, 345 p.
TORNOS A.F, La Geologa de la Faja Pirtica Ibrica: Instituto Geolgico y Minero
de Espaa. revista de la sociedad espaola de mineraloga, macla. n 10.noviembre08, 2008.
Franklin, J.M., 1996. Volcanic-associated massive sulphide deposits. In: Kirkham,
R.V. et al. (editors) Mineral Deposits Modeling, Geological Association of Canada,
Special Paper 40, pp. 315-334.