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

Journal Article · · Chemical Geology
 [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)
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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.

Research Organization:
Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
EAR-0838058; FG02-93ER14389; 9224–10; EAR-1053466; 1355590; AC52-06NA25396
OSTI ID:
1257841
Alternate ID(s):
OSTI ID: 1251482
Report Number(s):
LA-UR-15-21294; PII: S0009254115000303
Journal Information:
Chemical Geology, Vol. 398, Issue C; ISSN 0009-2541
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 53 works
Citation information provided by
Web of Science

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Cited By (7)

New shock microstructures in titanite (CaTiSiO5) from the peak ring of the Chicxulub impact structure, Mexico journal May 2019
Titanite dates crystallization: Slow Pb diffusion during super‐solidus re‐equilibration journal April 2019
U–Pb isotopic dating of titanite microstructures: potential implications for the chronology and identification of large impact structures journal September 2018
Controls on Trace Element Uptake in Metamorphic Titanite: Implications for Petrochronology journal June 2017
Natural Titanite Reference Materials for In Situ U‐Pb and Sm‐Nd Isotopic Measurements by LA ‐( MC )‐ ICP ‐ MS journal May 2019
Paleocene metamorphism along the Pennine–Austroalpine suture constrained by U–Pb dating of titanite and rutile (Malenco, Alps) journal September 2019
Interpreting titanite U–Pb dates and Zr thermobarometry in high-grade rocks: empirical constraints on elemental diffusivities of Pb, Al, Fe, Zr, Nb, and Ce journal May 2019

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Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
47 OTHER INSTRUMENTATION
titanite
U-Pb dating
oxygen isotopes
SIMS
zoning
diffusion
Adirondack mountains