{"id":7324,"date":"2021-07-07T14:42:41","date_gmt":"2021-07-07T12:42:41","guid":{"rendered":"https:\/\/ssef.ch\/?p=7324"},"modified":"2022-11-02T15:18:51","modified_gmt":"2022-11-02T14:18:51","slug":"age-dating-of-coral","status":"publish","type":"post","link":"https:\/\/www.ssef.ch\/fr\/age-dating-of-coral\/","title":{"rendered":"Age dating of coral"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\"> by Dr. M.S. Krzemnicki, first published in\u00a0<a href=\"https:\/\/ssef.ch\/wp-content\/uploads\/2020\/05\/facette-2020-web.pdf\">Facette 26<\/a> (May 2020) <\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img fetchpriority=\"high\" decoding=\"async\" width=\"684\" height=\"1024\" src=\"https:\/\/ssef.ch\/wp-content\/uploads\/2021\/07\/Page-30-Figure-1-684x1024.jpg\" alt=\"\" class=\"wp-image-7325\" srcset=\"https:\/\/www.ssef.ch\/wp-content\/uploads\/2021\/07\/Page-30-Figure-1-684x1024.jpg 684w, https:\/\/www.ssef.ch\/wp-content\/uploads\/2021\/07\/Page-30-Figure-1-200x300.jpg 200w, https:\/\/www.ssef.ch\/wp-content\/uploads\/2021\/07\/Page-30-Figure-1-768x1151.jpg 768w, https:\/\/www.ssef.ch\/wp-content\/uploads\/2021\/07\/Page-30-Figure-1-700x1049.jpg 700w, https:\/\/www.ssef.ch\/wp-content\/uploads\/2021\/07\/Page-30-Figure-1.jpg 1024w\" sizes=\"(max-width: 684px) 100vw, 684px\" \/><figcaption> <strong>Figure 1: <\/strong>Sciacca coral item from which beads were selected for age dating. Also in this picture are two pieces of raw corallium rubrum. Photo: M. Bichsel, SSEF. <\/figcaption><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">Since 2017, the Swiss Gemmological Institute SSEF offers radiocarbon dating of pearls as a service. To further expand our knowledge about this method and its applicability to other biogenic gem materials, we were happy to receive a number of small coral beads for age dating (kindly donated by E. Liverino). These beads were reportedly carved from so-called \u2018Sciacca\u2019 coral, corallium rubrum of historic age, sedimented in coral deposits off the coast of Sciacca, a small town in southwestern Sicily, Italy. In this area, frequent volcanic and tectonic activity in the past 10\u2019000 years (Holocene) has resulted in a submerged volcanic relief (known as the Graham bank) but also the sedimentation of fossil corals in three giant deposits. After their discovery, these deposits of fossil red corals were quickly and extensively depleted during the last part of the 19th century (Lodolo et al. 2017, DiGeronimo et al. 1993, Rajola 2012) and this material then has been widely used for jewellery until today.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">For the 14C radiocarbon dating on our Sciacca corals, we extracted a sample of calcium carbonate powder from a selected bead, to then be analysed by accelerated mass spectrometry (Micadas system) at the Laboratory of Ion Beam Physics of the ETH Zurich.<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img decoding=\"async\" width=\"925\" height=\"609\" src=\"https:\/\/ssef.ch\/wp-content\/uploads\/2021\/07\/410-Figure-2.jpg\" alt=\"\" class=\"wp-image-7328\" srcset=\"https:\/\/www.ssef.ch\/wp-content\/uploads\/2021\/07\/410-Figure-2.jpg 925w, https:\/\/www.ssef.ch\/wp-content\/uploads\/2021\/07\/410-Figure-2-300x198.jpg 300w, https:\/\/www.ssef.ch\/wp-content\/uploads\/2021\/07\/410-Figure-2-768x506.jpg 768w, https:\/\/www.ssef.ch\/wp-content\/uploads\/2021\/07\/410-Figure-2-700x461.jpg 700w\" sizes=\"(max-width: 925px) 100vw, 925px\" \/><figcaption> <strong>Figure 2: <\/strong>The radiocarbon dating of the analyzed Sciacca coral reveals its historic age (between 1467 \u2013 1647 AD; 95.4 % probability). <\/figcaption><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">Our data confirmed that the analysed coral sample is not recent but of historic age. The radiocarbon method dates it back to the late 15th to early 17th century\n(Figure 2), which is well in line for fossil\nSciacca corals being\nsedimented due to repeated volcanic\nevents in historic\nages. Based on our data we can definitively exclude\na recent age (post-bomb peak in the late 1960s)\nof this coral sample.\n\nWith this promising result,\nwe are now carrying out a broader\nradiocarbon dating study on gem-quality corals of historic\nage to gain further insights\ninto their provenance and age. Due to the fact that we apply an in-house\ndeveloped sampling method\nwhich uses less than 4 mg sample\npowder, radiocarbon dating\ncan be applied quasi non-destructively even on items\nof historic relevance and value. \n\n\n\n<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n","protected":false},"excerpt":{"rendered":"<p>by Dr. M.S. Krzemnicki, first published in\u00a0Facette 26 (May 2020) Since 2017, the Swiss Gemmological Institute SSEF offers radiocarbon dating of pearls as a service. To further expand our knowledge about this method and its applicability to other biogenic gem materials, we were happy to receive a number of small coral beads for age dating [&hellip;]<\/p>\n","protected":false},"author":3,"featured_media":7332,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"_monsterinsights_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0,"footnotes":""},"categories":[626],"tags":[739,740],"library_category":[],"library_author":[],"class_list":["post-7324","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-research-blog","tag-agedating","tag-organics"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.9 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Age dating of coral - SSEF<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.ssef.ch\/de\/age-dating-of-coral\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Age dating of coral - SSEF\" \/>\n<meta property=\"og:description\" content=\"by Dr. M.S. Krzemnicki, first published in\u00a0Facette 26 (May 2020) Since 2017, the Swiss Gemmological Institute SSEF offers radiocarbon dating of pearls as a service. To further expand our knowledge about this method and its applicability to other biogenic gem materials, we were happy to receive a number of small coral beads for age dating [&hellip;]\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.ssef.ch\/de\/age-dating-of-coral\/\" \/>\n<meta property=\"og:site_name\" content=\"SSEF\" \/>\n<meta property=\"article:published_time\" content=\"2021-07-07T12:42:41+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2022-11-02T14:18:51+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/www.ssef.ch\/wp-content\/uploads\/2021\/07\/Untitled-1-jpg.webp\" \/>\n\t<meta property=\"og:image:width\" content=\"1024\" \/>\n\t<meta property=\"og:image:height\" content=\"366\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/jpeg\" \/>\n<meta name=\"author\" content=\"Laurent Cartier\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"\u00c9crit par\" \/>\n\t<meta name=\"twitter:data1\" content=\"Laurent Cartier\" \/>\n\t<meta name=\"twitter:label2\" content=\"Dur\u00e9e de lecture estim\u00e9e\" \/>\n\t<meta name=\"twitter:data2\" content=\"2 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\\\/\\\/www.ssef.ch\\\/de\\\/age-dating-of-coral\\\/#article\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/www.ssef.ch\\\/de\\\/age-dating-of-coral\\\/\"},\"author\":{\"name\":\"Laurent Cartier\",\"@id\":\"https:\\\/\\\/www.ssef.ch\\\/zh-hans\\\/#\\\/schema\\\/person\\\/c855f01c061d2c7b29f823eaee439288\"},\"headline\":\"Age dating of coral\",\"datePublished\":\"2021-07-07T12:42:41+00:00\",\"dateModified\":\"2022-11-02T14:18:51+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\\\/\\\/www.ssef.ch\\\/de\\\/age-dating-of-coral\\\/\"},\"wordCount\":388,\"publisher\":{\"@id\":\"https:\\\/\\\/www.ssef.ch\\\/zh-hans\\\/#organization\"},\"image\":{\"@id\":\"https:\\\/\\\/www.ssef.ch\\\/de\\\/age-dating-of-coral\\\/#primaryimage\"},\"thumbnailUrl\":\"https:\\\/\\\/www.ssef.ch\\\/wp-content\\\/uploads\\\/2021\\\/07\\\/Untitled-1-jpg.webp\",\"keywords\":[\"Age Dating\",\"Organics\"],\"articleSection\":[\"Research Blog\"],\"inLanguage\":\"fr-FR\"},{\"@type\":\"WebPage\",\"@id\":\"https:\\\/\\\/www.ssef.ch\\\/de\\\/age-dating-of-coral\\\/\",\"url\":\"https:\\\/\\\/www.ssef.ch\\\/de\\\/age-dating-of-coral\\\/\",\"name\":\"Age dating of coral - 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