Local and regional variations in Central American arc lavas controlled by variations in subducted sediment input

2000 ◽  
Vol 138 (3) ◽  
pp. 265-283 ◽  
Author(s):  
Lina C. Patino ◽  
Michael J. Carr ◽  
Mark D. Feigenson
Keyword(s):  
Central American ◽  
Regional Variations ◽  
Sediment Input ◽  
Central American Arc ◽  
Subducted Sediment

Are the regional variations in Central American arc lavas due to differing basaltic versus peridotitic slab sources of fluids?

Geology ◽  
2002 ◽  
Vol 30 (11) ◽  
pp. 1035 ◽  
Author(s):  
Lars H. Rüpke ◽  
Jason Phipps Morgan ◽  
Matthias Hort ◽  
James A.D. Connolly
Keyword(s):  
Central American ◽  
Regional Variations ◽  
Central American Arc

Early Neogene history of the Central American arc from Bocas del Toro, western Panama

2003 ◽  
Vol 115 ◽  
pp. 271-287 ◽  
Author(s):  
Anthony G. Coates ◽  
Marie-Pierre Aubry ◽  
William A. Berggren ◽  
Laurel S. Collins ◽  
Michael Kunk
Keyword(s):  
Central American ◽  
Bocas Del Toro ◽  
Central American Arc ◽  
Early Neogene ◽  
History Of

scholarly journals A Calcium-in-Olivine Geohygrometer and its Application to Subduction Zone Magmatism

2016 ◽  
Vol 57 (9) ◽  
pp. 1811-1832 ◽  
Author(s):  
Maxim Gavrilenko ◽  
Claude Herzberg ◽  
Christopher Vidito ◽  
Michael J. Carr ◽  
Travis Tenner ◽  
...  
Keyword(s):  
Subduction Zone ◽  
High Precision ◽  
Electron Microprobe ◽  
Melt Inclusions ◽  
Melt Inclusion ◽  
Central American ◽  
Mass Spectrometry Analysis ◽  
Ionization Mass ◽  
Spectrometry Analysis ◽  
Central American Arc

High-precision electron microprobe analyses were obtained on olivine grains from Klyuchevskoy, Shiveluch and Gorely volcanoes in the Kamchatka Arc; Irazú, Platanar and Barva volcanoes of the Central American Arc; and mid-ocean ridge basalt (MORB) from the Siqueiros Transform. Calcium contents of these subduction zone olivines are lower than those for olivines from modern MORB, Archean komatiite and Hawaii. A role for magmatic H2O is likely for subduction zone olivines, and we have explored the suggestion of earlier workers that it has affected the partitioning of CaO between olivine and silicate melt. We provide a provisional calibration of DCaOOl/L as a function of magmatic MgO and H2O, based on nominally anhydrous experiments and minimally degassed H2O contents of olivine-hosted melt inclusions. Application of our geohygrometer typically yields 3–4 wt % magmatic H2O at the Kamchatka and Central American arcs for olivines having ∼1000 ppm Ca, which agrees with H2O maxima from melt inclusion studies; Cerro Negro and Shiveluch volcanoes are exceptions, with about 6% H2O. High-precision electron microprobe analyses with 10–20 μm spatial resolution on some olivine grains from Klyuchevskoy and Shiveluch show a decrease in Ca content from the core centers to the rim contacts, and a sharp increase in Ca in olivine rims. We suggest that the zoning of Ca in olivine from subduction zone lavas may provide the first petrological record of temporal changes that occur during hydration of the mantle wedge and dehydration during ascent, and we predict olivine H2O contents that can be tested by secondary ionization mass spectrometry analysis.

scholarly journals Comment to "Porphyry-related high-sulfidation mineralization early in Central American Arc Development: Cerro Quema deposit, Azuero Peninsula, Panama" by Perelló et al., (2020)

2021 ◽  
Vol 73 (1) ◽  
pp. A121220
Author(s):  
Isaac Corral
Keyword(s):  
Genetic Model ◽  
Porphyry Copper ◽  
Regional Scale ◽  
Hydrothermal Fluids ◽  
Central American ◽  
Geochronological Data ◽  
Magmatic Arc ◽  
High Sulfidation ◽  
Central American Arc ◽  
Azuero Peninsula

The Cerro Quema Au-Cu deposit is hosted by a dacite dome complex of the Río Quema Formation, a Late Campanian-Maastrichtian volcano-sedimentary sequence of the Panamanian magmatic arc. Its formational age is constrained at ~49 Ma by field evidences, crosscutting relationships and 40Ar/39Ar geochronology (Corral et al., 2016, Corral, 2021). The recent molybdenite Re-Os dates by Perelló et al. (2020) claim that ore is spatially and temporally related to the host volcanic domes at ~71 Ma. After a thorough review of the geologic, geochemical and geochronological data from the Cerro Quema area, it is concluded that the Re-Os dates of Perelló et al. (2020) are not representative of the Cerro Quema formational age. Their proposed formational age at ~71 Ma is significantly older than the age of the host rock (~67 Ma). Furthermore, they invoke a previously unrecognized regional-scale magmatic event solely based on their molybdenite Re-Os dates. Instead, the Cerro Quema genetic model discussed here, in which magmatic-hydrothermal fluids derived from porphyry copper-like intrusions associated with the Valle Rico batholith produced the Au-Cu mineralization at ~49 Ma, is consistent with the geology, geochemistry and geochronology of the Azuero Peninsula.

scholarly journals Rhyolite ignimbrite boulders and cobbles in the Middle Jurassic Carmel Formation of Utah and Arizona—age, composition, transport, and stratigraphic setting

2020 ◽  
Vol 7 ◽  
pp. 69-96
Author(s):  
Bart Kowallis ◽  
Douglas Sprinkel ◽  
Eric Christiansen ◽  
Skylor Steed ◽  
David Wheatley
Keyword(s):  
Middle Jurassic ◽  
Debris Flows ◽  
Tectonic Setting ◽  
Central American ◽  
Laser Fusion ◽  
Age Composition ◽  
Eruptive Center ◽  
Unusual Event ◽  
Central American Arc ◽  
Topographic Inversion

A stratigraphic layer containing rhyolite cobbles and boulders in the Middle Jurassic Carmel Formation of southern Utah represents a singular, unusual event in the otherwise low-energy sedimentation of this formation. A laser-fusion, single-crystal 40Ar/39Ar age of 171.73 ± 0.19 Ma obtained from sanidine in one of the clasts is about 8 m.y. older than a zircon U-Pb age obtained on a fallout tuff from the sediments surrounding the clasts (163.9 ± ~3.3 Ma). The volcanic clasts are poorly-welded rhyolite ignimbrites that may have been deposited as much as 200 km from the eruptive center, perhaps along pre-existing valleys. The tuff deposits then remained in place for several million years during which time they were subjected to weathering, alteration, and perhaps topographic inversion, creating mesas capped with tuff underlain by soft Middle Jurassic silt and mud. Triggered by unusual rainfall or earthquakes, debris flows carried the clasts a few 10s of kilometers from their outcrops to the depositional site. Earlier work proposed that the Middle Jurassic arc was a low-standing, arc-graben. If this was the case, then the tectonic setting was likely similar to the modern Central American arc in the vicinity of Nicaragua where tuffs erupted from a low-standing arc deposited onto an adjacent highland and were then eroded by streams flowing to the east onto a fluvial plain that is near the sea.

scholarly journals Porphyry-related high-sulfidation mineralization early in Central American Arc development: Cerro Quema deposit, Azuero Peninsula, Panama

2020 ◽  
Vol 72 (3) ◽  
pp. A260719
Author(s):  
José Perelló ◽  
Alfredo García ◽  
Robert A. Creaser
Keyword(s):  
Rapid Evolution ◽  
Leading Edge ◽  
Central American ◽  
Large Igneous Province ◽  
Land Bridge ◽  
High Sulfidation ◽  
Central American Arc ◽  
Quartz Veinlet ◽  
Age Range ◽  
North And South America

The 70.74 to 70.66 Ma age range for three molybdenite samples accompanying pyrite- and enargite-bearing assemblages effectively constrains an earliest Maastrichtian age for the high-sulfidation Au-Cu mineralization at Cerro Quema, Panama. The epithermal system was contemporaneous with emplacement of a composite dacite dome complex in a geotectonic setting transitional from mafic, primitive intraoceanic (Azuero Protoarc) to more evolved island arc magmatism (Azuero Arc), during initial construction of the Central American land bridge at the trailing edge of the Caribbean Large Igneous Province (CLIP). The molybdenite ages confirm the rapid evolution of the earliest stages of the Central American Arc, from subduction initiation at 75–73 Ma to arc maturation at 71 Ma. A porphyry connection is apparent at Cerro Quema and characterized by highly contorted, banded, and planar quartz-veinlet stockworks and sheeted zones in pyrophyllite- and sericite-bearing patchy-textured rock. These are cut by ledges of quartz, alunite, and dickite, which implies overprinting of the advanced argillic lithocap onto the underlying porphyry environment. Hydrothermal telescoping resulted from synmineralization uplift congruent with an actively emerging volcanic arc, which the Re-Os molybdenite dates accurately constrain at 71 Ma, presumably as a far-field effect of collision between the leading edge of the CLIP with parts of North and South America.

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