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Rates of Tectonometamorphic Processes from Rubidium and Strontium Isotopes in Garnet
Abstract
Measurement of the radial variation of the 87 Sr/ 86 Sr ratio in a single crystal from a metamorphic rock can be used to determine the crystal's growth rate. That variation records the accumulation of 87 Sr from radioactive decay of 87 Rb in the rock matrix from which the crystal grew. This method can be used to study the rates of petrological processes associated with mountain building. It is applied to garnet crystals in rocks from southeast Vermont that were metamorphosed about 380 million years ago. The average growth rate measured for three garnets is 1.4 -0.45 +0.92 millimeters per million years and the average time interval of growth is 10.5 ± 4.2 million years. Garnet and its mineral inclusions provide a sequential record of temperature change, strain, and chemical reactions during metamorphism; therefore, the technique offers the potential for determination of the rates of those processes as well. The growth interval and observed amount of rotation recorded by inclusion trails in one garnet indicate that the mean shear strain rate during garnet growth was 2.4 -0.7 +1.6 × 10 -14 per second.
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Cited by
Identification of the Cystic Fibrosis Gene: Cloning and Characterization of Complementary DNA
Riordan, J. R., Rommens, J. M., Kerem, B.-S., Alon, N., Rozmahel, R., Grzelczak, Z., Zielenski, J., Lok, S., Plavsic, N., Chou, J.-L., et al. (1989) · Science · doi:10.1126/science.2475911 · Cited by 7,418
Molecular Structure and Physiological Function of Chloride Channels
Jentsch, T. J., Stein, V., Weinreich, F., & Zdebik, A. A. (2002) · Physiological Reviews · doi:10.1152/physrev.00029.2001 · Cited by 1,256
Closure temperatures of the Sm—Nd system in metamorphic garnets
Mezger, K., Essene, E. J., & Halliday, A. N. (1992) · Earth and Planetary Science Letters · doi:10.1016/0012-821x(92)90141-h · Cited by 329
Mezger, K., Essene, E. J., van der Pluijm, B. A., & Halliday, A. N. (1993) · Contributions to Mineralogy and Petrology · doi:10.1007/bf00307862 · Cited by 166
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Metadata
- Authors
- Christensen, J. N., Rosenfeld, J. L., & DePaolo, D. J.
- Venue
- Science
- Published
- 1989-06-23
- Volume
- 244
- Issue
- 4911
- Pages
- 1465-1469
- ISSN
- 0036-8075 (ISSN-L)
- 1095-9203
- OpenAlex
- W2040012572
- Cited by
- 312
- References
- 0
- FWCI
- 7.47
- Type
- journal article
- Language
- en
- Open access
- closed
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- Christensen, J. N., Rosenfeld, J. L., & DePaolo, D. J. (1989). Rates of Tectonometamorphic Processes from Rubidium and Strontium Isotopes in Garnet. Science. https://doi.org/10.1126/science.244.4911.1465
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