26 Jun 2020
26 Jun 2020
Towards in-situ U–Pb dating of dolomites
- 1Geological Survey of Israel, Jerusalem, Israel
- 2Department of Earth Sciences, University of California, Santa Barbara, CA, USA
- 3Department of Natural Sciences, The Open University of Israel
- 1Geological Survey of Israel, Jerusalem, Israel
- 2Department of Earth Sciences, University of California, Santa Barbara, CA, USA
- 3Department of Natural Sciences, The Open University of Israel
Abstract. Recent U–Pb dating by laser ablation ICP-MS has demonstrated that reasonable precision (3–10 % 2σ) can be achieved for high-resolution dating of texturally distinct calcite phases. Absolute dating of dolomite, for which biostratigraphy and traditional dating techniques are very limited, remains challenging but may resolve many fundamental questions related to the timing of mineral-rock formation by syngenetic, diagenesis, hydrothermal, and epigenetic processes. In this study we explore the possibility of dating dolomitic rocks via recent LA-ICP-MS dating techniques developed for calcite. The in-situ U–Pb dating was tested on a wide range of dolomite rocks of various origins (i.e., syngenetic, early diagenetic and epigenetic) from the Cambrian to Pliocene age – all of which from well-constrained stratigraphic sections in Israel. We present in-situ U–Pb results of dolomitic rock samples, together with imaging techniques and chemical characterizations. We show that dolomite dating is highly sensitive to textural differences and highlight parameters such as crater morphology and roughness, calcite zoning and impurities that may affect the interpretation of the resulted ages. Textural examination indicates zonation and mixing of different phases at the sub-millimeter scale (< 1 µm), and thus Tera-Wasserburg ages may represent mixing dates of early diagenesis and some later epigenetic dolomitization event(s). We conclude that age mixing at the sub-millimeter scale is a major problem in dolomite dating that need to be further studied and note the necessity of matrix-matched standards for accurate dating.
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Bar Elisha et al.


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RC1: 'Review of 'Towards in-situ U-Pb dating of dolomites' by Jon Woodhead', Jon Woodhead, 23 Jul 2020
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AC1: 'Interactive comment on “Towards in-situ U–Pb dating of dolomites”', Bar Elisha, 01 Sep 2020
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AC1: 'Interactive comment on “Towards in-situ U–Pb dating of dolomites”', Bar Elisha, 01 Sep 2020
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SC1: 'Comment on "Towards in-situ U–Pb dating of dolomite" (pre-print)', Daniel Petráš, 23 Jul 2020
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AC3: 'Interactive comment on “Towards in-situ U–Pb dating of dolomites”', Bar Elisha, 04 Sep 2020
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AC3: 'Interactive comment on “Towards in-situ U–Pb dating of dolomites”', Bar Elisha, 04 Sep 2020
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RC2: 'Reviewer comment on manuscript gchron-2020-19 by Elisha et al.', Guilhem Hoareau, 26 Jul 2020
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AC2: 'Interactive comment on “Towards in-situ U–Pb dating of dolomites”', Bar Elisha, 01 Sep 2020
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AC2: 'Interactive comment on “Towards in-situ U–Pb dating of dolomites”', Bar Elisha, 01 Sep 2020
Bar Elisha et al.
Bar Elisha et al.
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Cited
2 citations as recorded by crossref.
- Direct U–Pb dating of carbonates from micron-scale femtosecond laser ablation inductively coupled plasma mass spectrometry images using robust regression G. Hoareau et al. 10.5194/gchron-3-67-2021
- The use of ASH-15 flowstone as a matrix-matched reference material for laser-ablation U − Pb geochronology of calcite P. Nuriel et al. 10.5194/gchron-3-35-2021