High 3He/4He in central Panama reveals a distal connection to the Galapagos plume

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Bekaert D. V., Gazel E., Turner S., Behn M. D., de Moor J. M., Zahirovic S., ...Daha Fazla

Proceedings of the National Academy of Sciences of the United States of America, cilt.118, sa.47, 2021 (SCI-Expanded) identifier identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 118 Sayı: 47
  • Basım Tarihi: 2021
  • Doi Numarası: 10.1073/pnas.2110997118
  • Dergi Adı: Proceedings of the National Academy of Sciences of the United States of America
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Academic Search Premier, Agricultural & Environmental Science Database, Animal Behavior Abstracts, Aquatic Science & Fisheries Abstracts (ASFA), Artic & Antarctic Regions, BIOSIS, CAB Abstracts, Chemical Abstracts Core, EconLit, EMBASE, Food Science & Technology Abstracts, INSPEC, Linguistic Bibliography, MathSciNet, MEDLINE, Pollution Abstracts, Psycinfo, Public Affairs Index, Veterinary Science Database, zbMATH, DIALNET
  • Anahtar Kelimeler: helium, mantle plume, slab window, mantle flow, geochemistry, EAST PACIFIC RISE, COSTA-RICA, ISOTOPE SYSTEMATICS, NOBLE-GASES, MANTLE FLOW, VOLCANIC PROVINCE, GEOTHERMAL FLUIDS, HELIUM-ISOTOPES, PARALLEL FLOW, CARBON
  • Orta Doğu Teknik Üniversitesi Adresli: Evet

Özet

© 2021 National Academy of Sciences. All rights reserved.It is well established that mantle plumes are the main conduits for upwelling geochemically enriched material from Earth's deep interior. The fashion and extent to which lateral flow processes at shallow depths may disperse enriched mantle material far (>1,000 km) from vertical plume conduits, however, remain poorly constrained. Here, we report He and C isotope data from 65 hydrothermal fluids from the southern Central America Margin (CAM) which reveal strikingly high 3He/4He (up to 8.9RA) in low-temperature (≤50 °C) geothermal springs of central Panama that are not associated with active volcanism. Following radiogenic correction, these data imply a mantle source 3He/4He >10.3RA (and potentially up to 26RA, similar to Galapagos hotspot lavas) markedly greater than the upper mantle range (8 ± 1RA). Lava geochemistry (Pb isotopes, Nb/U, and Ce/Pb) and geophysical constraints show that high 3He/4He values in central Panama are likely derived from the infiltration of a Galapagos plume-like mantle through a slabwindowthat opened ∼8 Mya. Two potential transport mechanisms can explain the connection between the Galapagos plume and the slab window: 1) sublithospheric transport of Galapagos plume material channeled by lithosphere thinning along the Panama Fracture Zone or 2) active upwelling of Galapagos plume material blown by a "mantle wind" toward the CAM. We present a model of global mantle flow that supports the second mechanism, whereby most of the eastward transport of Galapagos plume material occurs in the shallow asthenosphere. These findings underscore the potential for lateral mantle flow to transport mantle geochemical heterogeneities thousands of kilometers away from plume conduits.