气候变化领域集成服务门户(CCPortal): High 3He/4He in central Panama reveals a distal connection to the Galapagos plume

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DOI	10.1073/pnas.2110997118
	High 3He/4He in central Panama reveals a distal connection to the Galapagos plume
	Bekaert D.V.; Gazel E.; Turner S.; Behn M.D.; de Moor J.M.; Zahirovic S.; Manea V.C.; Hoernle K.; Fischer T.P.; Hammerstrom A.; Seltzer A.M.; Kulongoski J.T.; Patel B.S.; Schrenk M.O.; Halldórsson S.A.; Nakagawa M.; Ramírez C.J.; Krantz J.A.; Yücel M.; Ballentine C.J.; Giovannelli D.; Lloyd K.G.; Barry P.H.
发表日期	2021
ISSN	0027-8424
卷号	118 期号:47
英文摘要	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. © 2021 National Academy of Sciences. All rights reserved.
英文关键词	Geochemistry; Helium; Mantle flow; Mantle plume; Slab window
语种	英语
scopus关键词	carbon; cerium; dissolved inorganic carbon; helium; lead; niobium; unclassified drug; uranium; Article; chemical composition; controlled study; geochemistry; inductively coupled plasma mass spectrometry; ion chromatography; isotope analysis; low temperature; mass spectrometry; Panama; plume; stereomicroscopy; thermal ionization mass spectrometry; thermal spring; X ray fluorescence
来源期刊	Proceedings of the National Academy of Sciences of the United States of America
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/250982
作者单位	Marine Chemistry and Geochemistry Department, Woods Hole Oceanographic Institution, Woods Hole, MA 02543, United States; Earth and Atmospheric Sciences, Cornell University, Ithaca, NY 14853, United States; Department of Geosciences, University of Massachusetts, Amherst, MA 01003, United States; Department of Earth and Environmental Sciences, Boston College, Chestnut Hill, MA 02467, United States; Observatorio Vulcanologico y Sismologico de Costa Rica, Universidad Nacional, Heredia, 86-3000, Costa Rica; EarthByte Group, School of Geosciences, The University of Sydney, Sydney, NSW 2006, Australia; Computational Geodynamics Laboratory, Centro de Geociencias, Universidad Nacional Autonoma deMexico, Campus Juriquilla, Queretaro, 76230, Mexico; Faculty of Geology and Geophysics, University of Bucharest, Bucharest, 010041, Romania; Geosciences Research Division, GEOMAR Helmholtz Centre for Ocean Research Kiel, Kiel, 24148, Germany; Institute of Geosciences, Kiel University, Kiel, 24118, Germany; Department ...
推荐引用方式 GB/T 7714	Bekaert D.V.,Gazel E.,Turner S.,et al. High 3He/4He in central Panama reveals a distal connection to the Galapagos plume[J],2021,118(47).
APA	Bekaert D.V..,Gazel E..,Turner S..,Behn M.D..,de Moor J.M..,...&Barry P.H..(2021).High 3He/4He in central Panama reveals a distal connection to the Galapagos plume.Proceedings of the National Academy of Sciences of the United States of America,118(47).
MLA	Bekaert D.V.,et al."High 3He/4He in central Panama reveals a distal connection to the Galapagos plume".Proceedings of the National Academy of Sciences of the United States of America 118.47(2021).