Monogenetic, behind-the-front volcanism in southeastern Guatemala and western El Salvador: 40Ar/39Ar ages and tectonic implications

Abstract Eighteen lavas erupted from cinder cones behind the volcanic front in southeastern Guatemala and western El Salvador have been dated using the 40 Ar/ 39 Ar method on groundmass separates. Plateau ages range between 1069.5 ± 22.1and 37 ± 12.0 ka. The majority of dated lavas are younger than 600 ka. Importantly, cinder cone lavas become progressively younger toward the volcanic front/trench. In addition, the lavas become systematically depleted in Cs, Ba, rare earth elements, Cs/Zr, La/Zr, and δ 18 O with time. The baseline values of these same geochemical parameters increase with distance from the volcanic front. The cinder cone lavas are closely associated with rifting south of the North American–Caribbean plate boundary. The trenchward migration of behind-the-front volcanism may be linked to a westward migration of this rifting. Existing evidence suggests there was an important change in the face of volcanism behind the volcanic front in southeastern Guatemala: from a small number of large polygenetic volcanoes to abundant smaller monogenetic cones. The temporal/spatial changes in the geochemistry of cinder cone lavas is attributed to decreasing contamination by Paleozoic basement rocks, both with time and with diminishing distances to the volcanic front.

[1]  Javier F. Pacheco,et al.  Nature of seismic coupling along simple plate boundaries of the subduction type , 1993 .

[2]  W. Strauch,et al.  Arc-parallel flow in the mantle wedge beneath Costa Rica and Nicaragua , 2008, Nature.

[3]  Katherine A. Kelley,et al.  High water contents in basaltic magmas from Irazú Volcano, Costa Rica , 2007 .

[4]  M. Gordon,et al.  Rotation of the Chortís block causes dextral slip on the Guayape fault , 1994 .

[5]  David W. Szymanski,et al.  Galapagos‐OIB signature in southern Central America: Mantle refertilization by arc–hot spot interaction , 2009 .

[6]  D. Hooper,et al.  Computer-simulation models of scoria cone degradation , 1998 .

[7]  B. Jicha,et al.  Volcanic history and magmatic evolution of Seguam Island, Aleutian Island arc, Alaska , 2006 .

[8]  J. Morris,et al.  The subducted component in island arc lavas: constraints from Be isotopes and B–Be systematics , 1990, Nature.

[9]  J. Hunziker.  Potassium Argon Dating , 1979 .

[10]  J. Morgan,et al.  Intra-arc extension in Central America: Links between plate motions, tectonics, volcanism, and geochemistry , 2008 .

[11]  J. E. Case,et al.  The Caribbean Region , 2021, Trouillot Remixed.

[12]  S. Fedotov.  Magma rates in feeding conduits of different volcanic centres , 1981 .

[13]  P. Mann,et al.  Tectonic terranes of the Chortis block based on integration of regional aeromagnetic and geologic data , 2007 .

[14]  A GPS and modelling study of deformation in northern Central America , 2009 .

[15]  C. Lasserre,et al.  Kinematics of the North American–Caribbean‐Cocos plates in Central America from new GPS measurements across the Polochic‐Motagua fault system , 2006 .

[16]  R. Rogers.  Jurassic-recent tectonic and stratigraphic history of the Chortis block of Honduras and Nicaragua (northern Central America) , 2003 .

[17]  M. J. Carr,et al.  Abrupt change in magma generation processes across the Central American arc in southeastern Guatemala: flux-dominated melting near the base of the wedge to decompression melting near the top of the wedge , 1995 .

[18]  Jochen Bundschuh,et al.  Central America: Geology, Resources and Hazards , 2007 .

[19]  M. J. Carr.  Underthrusting and Quaternary faulting in northern Central America , 1976 .

[20]  W. Rose,et al.  Origin of silicic magmas along the Central American volcanic front: Genetic relationship to mafic melts , 2006 .

[21]  Ellen M. Syracuse,et al.  Global compilation of variations in slab depth beneath arc volcanoes and implications , 2006 .

[22]  J.A. Walker,et al.  Petrogenesis of Lavas from Cinder Cone Fields behind the Volcanic Front of Central America , 1981, The Journal of Geology.

[23]  M. J. Carr,et al.  Slab control over HFSE depletions in Central Nicaragua , 2001 .

[24]  B. Burkart.  Neogene North American-Caribbean plate boundary across northern Central America: offset along the Polochic fault , 1983 .

[25]  R. Johnson,et al.  Isotopic and trace-element profiles across the New Britain island arc, Papua New Guinea , 1993 .

[26]  M. Portnyagin,et al.  Subduction cycling of volatiles and trace elements through the Central American volcanic arc: evidence from melt inclusions , 2008 .

[27]  W. Spakman,et al.  Subduction and slab detachment in the Mediterranean-Carpathian region. , 2000, Science.

[28]  M. J. Carr,et al.  Nicaraguan volcanoes record paleoceanographic changes accompanying closure of the Panama gateway , 2002 .

[29]  Xixi Zhao,et al.  Matuyama-Brunhes reversal and Kamikatsura event on Maui: paleomagnetic directions, 40 Ar/ 39 Ar ages and implications , 2004 .

[30]  M. J. Carr,et al.  Cross-arc geochemical variations in volcanic fields in Honduras C.A.: progressive changes in source with distance from the volcanic front , 1997 .

[31]  P. Mann.  Overview of the tectonic history of northern Central America , 2007 .

[32]  G. B. Dalrymple,et al.  Potassium-Argon Dating: Principles, Techniques and Applications to Geochronology , 1969 .

[33]  C. Doglioni,et al.  Evidence for serpentinite fluid in convergent margin systems: The example of El Salvador (Central America) arc lavas , 2007 .

[34]  T. Harrison,et al.  10Be imaging of sediment accretion and subduction along the northeast Japan and Costa Rica convergent margins , 2002 .

[35]  A. McBirney,et al.  Geologic reconnaissance of southeastern Guatemala , 1964 .

[36]  T. Hasenaka,et al.  The cinder cones of Michoacán—Guanajuato, central Mexico: their age, volume and distribution, and magma discharge rate , 1985 .

[37]  R. Steiger,et al.  Subcommission on geochronology: Convention on the use of decay constants in geo- and cosmochronology , 1977 .

[38]  M. J. Carr,et al.  Volcanism and Geochemistry in Central America: Progress and Problems , 2013 .

[39]  A. E. Draut,et al.  Tracing the evolving flux from the subducting plate in the Tonga-Kermadec arc system using boron in volcanic glass , 2001 .

[40]  M. J. Carr,et al.  Local and regional variations in Central American arc lavas controlled by variations in subducted sediment input , 2000 .

[41]  G. Plafker.  Tectonic Aspects of the Guatemala Earthquake of 4 February 1976 , 1976, Science.

[42]  R. Hilst,et al.  Epeirogenic uplift above a detached slab in northern Central America , 2002 .

[43]  S. Galeotti,et al.  Long-term subduction-erosion along the Guatemalan margin of the Middle America Trench , 2004 .

[44]  P. Renne,et al.  Intercalibration of standards, absolute ages and uncertainties in 40Ar/39Ar dating , 1998 .

[45]  Paul Mann,et al.  Transtensional deformation of the western Caribbean–North America plate boundary zone , 2007 .

[46]  Kazuaki Nakamura,et al.  Volcanoes as possible indicators of tectonic stress orientation — principle and proposal , 1977 .

[47]  E. Nakamura,et al.  Origin of the slab component in arc lavas from across-arc variation of B and Pb isotopes , 1994, Nature.

[48]  M. J. Carr,et al.  Petrogenetic insights provided by compositional transects across the Central American arc: Southeastern Guatemala and Honduras , 2000 .

[49]  R. Edwards,et al.  U-series disequilibria in Guatemalan lavas, crustal contamination, and implications for magma genesis along the Central American subduction zone , 2007 .

[50]  J. Ryan,et al.  Describing Chemical Fluxes in Subduction Zones: Insights from "Depth Profiling" Studies of Arc and Forearc Rocks , 1996 .

[51]  S. Newman,et al.  The role of water in the petrogenesis of Mariana trough magmas , 1994 .

[52]  W. Rose,et al.  Explosive eruptions of the Ayarza calderas, southeastern Guatemala , 1985 .

[53]  M. J. Carr,et al.  Flux versus decompression melting at stratovolcanoes in southeastern Guatemala , 2003 .

[54]  H. Pichler,et al.  Petrochemical aspects of Central American Magmatism , 1973 .

[55]  J. Eiler.  Inside the subduction factory , 2003 .

[56]  J. J. Martínez-Díaz,et al.  Constraints from finite element modeling on the active tectonics of northern Central America and the Middle America Trench , 2008 .

[57]  J.A. Walker,et al.  Diverse volcanism in southeastern Guatemala: The role of crustal contamination , 2006 .

[58]  T. Ishikawa,et al.  Source, composition and distribution of the fluid in the Kurile mantle wedge: Constraints from across-arc variations of B/Nb and B isotopes , 1997 .

[59]  Michael J. Carr,et al.  Oxygen isotope constraints on the sources of Central American arc lavas , 2005 .

[60]  R. Fergason,et al.  Thermal structure of the Costa Rica – Nicaragua subduction zone , 2005 .

[61]  M. J. Carr,et al.  Boron geochemistry of the Central American Volcanic Arc: Constraints on the genesis of subduction-related magmas , 1994 .

[62]  J.A. Walker,et al.  Light elements and Li isotopes across the northern portion of the Central American subduction zone , 2009 .

[63]  C. Wood.  Morphometric analysis of cinder cone degradation , 1980 .

[64]  A. Takada.  The influence of regional stress and magmatic input on styles of monogenetic and polygenetic volcanism , 1994 .

[65]  M. J. Carr,et al.  Lead isotope composition of Central American volcanoes: Influence of the Galapagos plume , 2004 .

[66]  P. Wallace.  Volatiles in subduction zone magmas: concentrations and fluxes based on melt inclusion and volcanic gas data , 2005 .

[67]  J. Bundschuh,et al.  Volcanism and volcanic landforms , 2012 .

[68]  B. Burkart,et al.  Extension and rotation of crustal blocks in northern Central America and effect on the volcanic arc , 1985 .

[69]  Derek York,et al.  Least squares fitting of a straight line with correlated errors , 1968 .

[70]  M. Wortel,et al.  Shallow slab detachment as a transient source of heat at midlithospheric depths , 2001 .

[71]  D. Giardini,et al.  Episodic Back-arc extension during restricted mantle convection in the Central Mediterranean , 2001 .

[72]  M. Guzmán-Speziale,et al.  Active seismic deformation in the grabens of northern Central America and its relationship to the relative motion of the North America–Caribbean plate boundary , 2001 .

[73]  L. Patiño,et al.  The water and trace element contents of melt inclusions across an active subduction zone , 2003 .