The Role of Isotopic Geochronology in Earth Sciences
DOI:
https://doi.org/10.54097/ysmsrt05Keywords:
Ar-Ar method; Isotope geochronology; Rb-Sr method; Re-Os method; U-Pb method.Abstract
Isotopic geochronology, a specialized field within isotopic geochemistry, has evolved through the interdisciplinary integration of geology, nuclear physics, and radiochemistry. By applying the principles of radioactive isotope decay, isotopic geochronology provides precise geological dating, forming scientific timelines for Earth's major evolutionary stages. This study offers a concise summary and discussion of isotopic dating principles, age representation methods, and the theories, applications, and formulas of widely used high-precision isotopic dating techniques. The primary isotopic dating techniques include: (1) The U-Pb dating method provides four simultaneous age values for a sample. Evaluating their consistency ensures higher reliability in the age determination. (2) The Rb-Sr method, employing isochron techniques, is mainly used for dating mafic, intermediate, and intermediate-acidic igneous rocks, with limited applications in metamorphic and sedimentary rocks. (3) The Sm-Nd method effectively dates mafic and ultramafic rocks and is widely applied in the study of ancient metamorphic rocks' age and genesis. Isochron techniques determine the formation time and initial Nd isotopic values of the source. (4) The Ar-Ar method offers high precision without requiring chemical treatment, thereby minimizing contamination and ensuring complete data integrity. Ages are determined through 40Ar/39Ar ratio analysis. (5) The Re-Os method is directly applicable to ore minerals and extensively used in dating and studying the genesis of metallic ore deposits.
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[1] Yin R, Feng X, Li X, et al. Trends and advances in mercury stable isotopes as a geochemical tracer[J]. Trends in Environmental Analytical Chemistry, 2014, 2: 1-10.
[2] Huang J H, Huang F, Evans L, et al. Vanadium: Global (bio) geochemistry[J]. Chemical Geology, 2015, 417: 68-89.
[3] Anda Du, Wenjun Qu, Chao Li, Gang Yang. A Review on the Development of Re-Os Isotopic Dating Methods and Techniques [J]. Rock and Mineral Analysis,2009,28(03):288-304.
[4] Woodhead J D, Hergt J M. Application of thedouble spike'technique to Pb-isotope geochronology[J]. Chemical Geology, 1997, 138(3-4): 311-321.Reichert J, Borg G. Numerical simulation and a geochemical model of supergene carbonate-hosted non-sulphide zinc deposits[J]. Ore Geology Reviews, 2008, 33(2): 134-151.
[5] Charlier B L A, Ginibre C, Morgan D, et al. Methods for the microsampling and high-precision analysis of strontium and rubidium isotopes at single crystal scale for petrological and geochronological applications[J]. Chemical Geology, 2006, 232(3-4): 114-133. Jaffey A H, Flynn K F, Glendenin L E, et al. Precision measurement of half-lives and specific activities of U 235 and U 238[J]. Physical review C, 1971, 4(5): 1889.
[6] Hou Bo ,Yao Xuegang. Application of isotope geochemistry in earth science [J]. Geology of Chemical Minerals, 2021, 43(03): 193-200.
[7] Corfu F. A century of U-Pb geochronology: The long quest towards concordance[J]. Bulletin, 2013, 125(1-2): 33-47.
[8] Steiger R H, Jäger E. Subcommission on geochronology: convention on the use of decay constants in geo-and cosmochronology[J]. Earth and planetary science letters, 1977, 36(3): 359-362.
[9] Wen Chen, Yusheng Wan, Huaqin Li, Zongqing Zhang, Tongmo Dai, Ze'en Shi, Jingbo Sun. Isotope Geochronology: Technique and Application [J]. Acta Geologica Sinica, 2011, 85(11): 1917-1947.
[10] de Moraes J D, Cordeiro P, Abrahão Filho E, et al. Metamorphic disturbances of magnetite chemistry and the Sm-Nd isotopic system of reworked Archean iron formations from NE Brazil[J]. Geoscience frontiers, 2022, 13(5): 101131.
[11] Ll Chao SUN PengCheng ,MENG HuiMing ,Hou jiangLong, ZHOU LiMin ,ZHAO Hong ,ZHAO LingHao ,Qu WenJun. A new age determination technique for rare metal deposits: In situ Sm-Nd dating[J]. Acta Petrologica Sinica, 2022, 38(02):445-454.
[12] Liu Qian ,Tang Limei ,Chen Ling ,Hu Yanhua ,Wu Zhaocai ,Meng Wanbin. Petrogenesis of basalts in CC area of eastern Pacific:39Ar/40Ar chronology and geochemistry evidences [J]. Chinese Journal of Geology,2023,58(02):511-528.
[13] Fitz-Diaz E, van der Pluijm B. Fold dating: A new Ar/Ar illite dating application to constrain the age of deformation in shallow crustal rocks[J]. Journal of Structural Geology, 2013, 54: 174-179.
[14] SONG Han ,PAN Longke ,LUO Hua ,HE Renliang. Research Review and Geological Application of Re-Os Dating[J]. Resources Environment & Engineering,2013,27(05):681-687.DOI:10.16536/j.cnki.issn.1671-1211.2013.05.033.
[15] Albarede F, Telouk P, Blichert-Toft J, et al. Precise and accurate isotopic measurements using multiple-collector ICPMS[J]. Geochimica et Cosmochimica Acta, 2004, 68(12): 2725-2744.
[16] Woodhead J. A simple method for obtaining highly accurate Pb isotope data by MC-ICP-MS[J]. Journal of Analytical Atomic Spectrometry, 2002, 17(10): 1381-1385.
[17] Liu Y S, Hu Z C, Li M, et al. Applications of LA-ICP-MS in the elemental analyses of geological samples[J]. Chinese Science Bulletin, 2013, 58(32): 3863-3878.
[18] Nadoll P, Koenig A E. LA-ICP-MS of magnetite: methods and reference materials[J]. Journal of Analytical Atomic Spectrometry, 2011, 26(9): 1872-1877.
[19] Seo J H, Guillong M, Aerts M, et al. Microanalysis of S, Cl, and Br in fluid inclusions by LA–ICP-MS[J]. Chemical Geology, 2011, 284(1-2): 35-44.
[20] Liu Y S, Hu Z C, Zong K Q, et al. Reappraisement and refinement of zircon U-Pb isotope and trace element analyses by LA-ICP-MS[J]. Chinese Science Bulletin, 2010, 55(15): 1535-1546.
[21] Tichomirowa M, Käßner A, Repstock A, et al. New CA-ID-TIMS U–Pb zircon ages for the Altenberg–Teplice Volcanic Complex (ATVC) document discrete and coeval pulses of Variscan magmatic activity in the Eastern Erzgebirge (Eastern Variscan Belt)[J]. International Journal of Earth Sciences, 2022, 111(6): 1885-1908.
[22] Kejun Hou, Yanhe Li. The determination of in situ micro-region U-Pb ages of single zircon grains with sizes ranging from 8 to 10 μm using LA-MC-ICP-MS. [J]. Mineral Deposits,2010,29(S1):447-449.DOI:10.16111/j.0258-7106.2010.s1.231.
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