DOI: 10.1016/j.epsl.2020.116636
论文题名: Combination of Δ47 and U-Pb dating in tectonic calcite veins unravel the last pulses related to the Pyrenean Shortening (Spain)
作者: Hoareau G. ; Crognier N. ; Lacroix B. ; Aubourg C. ; Roberts N.M.W. ; Niemi N. ; Branellec M. ; Beaudoin N. ; Suárez Ruiz I.
刊名: Earth and Planetary Science Letters
ISSN: 0012821X
出版年: 2021
卷: 553 语种: 英语
中文关键词: carbonate U-Pb geochronology
; clumped isotopes
; fractures
; Pyrenees
; veins
英文关键词: Binary alloys
; Calcite
; Flow of fluids
; Geochronology
; Isotopes
; Lead alloys
; Lead compounds
; Tectonics
; Cement formation
; Clumped isotopes
; Fluid inclusion
; Number of samples
; Precipitation temperature
; Reordering models
; Temperature history
; Thermal evolution
; Uranium alloys
; calcite
; fluid flow
; geochronology
; host rock
; tectonic evolution
; tectonic setting
; uranium-lead dating
; vein (geology)
; Spain
英文摘要: Clumped isotopes thermometry (Δ47) and U-Pb dating of carbonates have been used to elucidate the temperature-time conditions of 10 tectonic calcite veins in the hanging wall of the South Pyrenean Frontal Thrust (Spain), the youngest thrust unit in the south-central Pyrenees. The Δ47 values indicate precipitation temperatures below ∼90 °C, in agreement with fluid inclusion analyses. 6 veins have been successfully dated, giving ages between 61 and 14.5 Ma with all but one value below 24 Ma. On the basis of our new results, we propose that several the studied veins record the end of Pyrenean tectonics in the area during the Burdigalian, possibly up to the Serravalian, younger than estimates based on magnetostratigraphic data from continental syn-tectonic deposits. Calculated δ18O values of the precipitating fluid are either very positive, suggesting a local source that has interacted with the host rock, or negative, suggesting the downward incursion of meteoric waters. For undated or pre-burial veins, the Δ47 values derived from temperature history reordering model (THRM) show that the measured Δ47 values may have been significantly altered during burial, preventing their use as a reliable thermal or paleohydrological marker. Although applied to a limited number of samples, these results highlight the great potential of the U-Pb/Δ47 approach to decipher the history of vein or cement formation and fluid flow in complex tectonic zones, provided that (i) the thermal evolution is known and (ii) the extent of clumped isotope reordering is systematically modelled. © 2020 Elsevier B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/165511
Appears in Collections: 气候变化与战略
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作者单位: Universite de Pau et des Pays de l'Adour, E2S UPPA, CNRS, TOTAL, LFCR, UMR5150, Pau, 64000, France; Department of Geology, Kansas State University, 108 Thompson hall, Manhattan, KS 66506, United States; NERC Isotope Geosciences Laboratory, British Geological Survey, Nottingham, United Kingdom; Department of Environmental and Earth Science, University of Michigan, United States; Instituto de Ciencia y Tecnología del Carbono INCAR-CSIC, Oviedo, Spain
Recommended Citation:
Hoareau G.,Crognier N.,Lacroix B.,et al. Combination of Δ47 and U-Pb dating in tectonic calcite veins unravel the last pulses related to the Pyrenean Shortening (Spain)[J]. Earth and Planetary Science Letters,2021-01-01,553