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Title: Combined oxygen-isotope and U-Pb zoning studies of titanite: New criteria for age preservation

Here, titanite is an important U-Pb chronometer for dating geologic events, but its high-temperature applicability depends upon its retention of radiogenic lead (Pb). Experimental data predict similar rates of diffusion for lead (Pb) and oxygen (O) in titanite at granulite-facies metamorphic conditions (T = 650-800°C). This study therefore investigates the utility of O-isotope zoning as an indicator for U-Pb zoning in natural titanite samples from the Carthage-Colton Mylonite Zone of the Adirondack Mountains, New York. Based on previous field, textural, and microanalytical work, there are four generations (types) of titanite in the study area, at least two of which preserve diffusion-related δ18O zoning. U-Th-Pb was analyzed by SIMS along traverses across three grains of type-2 titanite, which show well-developed diffusional δ18O zoning, and one representative grain from each of the other titanite generations.
 [1] ;  [2] ;  [3] ;  [3] ;  [3]
  1. Los Alamos National Lab. (LANL), Los Alamos, NM (United States); Univ. of Wisconsin-Madison, Madison, WI (United States)
  2. The Australian National Univ., Canberra, ACT (Australia)
  3. Univ. of Wisconsin-Madison, Madison, WI (United States)
Publication Date:
OSTI Identifier:
Report Number(s):
Journal ID: ISSN 0009-2541; PII: S0009254115000303
Grant/Contract Number:
EAR-0838058; FG02-93ER14389; 9224–10; EAR-1053466; 1355590; AC52-06NA25396
Accepted Manuscript
Journal Name:
Chemical Geology
Additional Journal Information:
Journal Volume: 398; Journal Issue: C; Journal ID: ISSN 0009-2541
Research Org:
Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
Sponsoring Org:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
Country of Publication:
United States
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY; 47 OTHER INSTRUMENTATION titanite; U-Pb dating; oxygen isotopes; SIMS; zoning; diffusion; Adirondack mountains