{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2025,5,14]],"date-time":"2025-05-14T02:32:33Z","timestamp":1747189953088,"version":"3.40.5"},"reference-count":58,"publisher":"Geological Society of London","issue":"5","license":[{"start":{"date-parts":[[2017,4,4]],"date-time":"2017-04-04T00:00:00Z","timestamp":1491264000000},"content-version":"stm-asf","delay-in-days":0,"URL":"https:\/\/doi.org\/10.15223\/policy-002"}],"funder":[{"name":"Hong Kong SAR Government"}],"content-domain":{"domain":["www.lyellcollection.org"],"crossmark-restriction":true},"short-container-title":["JGS"],"published-print":{"date-parts":[[2017,9]]},"abstract":"<jats:p>\n            The Middle Jurassic Tuen Mun Formation, Hong Kong, is a fault-bounded block of rare andesitic and related rocks that preserve a snapshot of the developing SE China continental arc system during the late Mesozoic. The forearc depositional setting is considered to have been dominated by an emergent andesitic volcanic massif, which shows a transition to a fluvial-dominated volcanic plain, and then to an offshore marine environment. The youngest laser ablation inductively coupled plasma mass spectrometry U\u2013Pb detrital zircon ages obtained from the three packages define a coherent group (\n            <jats:italic>n<\/jats:italic>\n            \u2009=\u2009396; MSWD\u2009=\u20091.8) suggesting a maximum depositional age of 169.5\u2009\u00b1\u20090.3\u2005Ma. The dominance of large euhedral and concentrically zoned zircons reflects a common volcanic provenance. Hf isotope data (\n            <jats:italic>\u03b5<\/jats:italic>\n            <jats:sub>Hf<\/jats:sub>\n            (\n            <jats:italic>t<\/jats:italic>\n            )\u2009=\u20090 to \u221211) on the youngest representative zircon grains imply derivation of magmas from dominantly recycled crustal sources. The detrital zircon age signatures and Hf isotope data show no indication of magmatic interaction with adjacent late Palaeozoic and Early to Middle Jurassic sedimentary rocks, or Middle Jurassic to Early Cretaceous magmatic rocks of Hong Kong. On the basis of the structural, zircon age and isotope data, the Tuen Mun Formation is interpreted to be an allochthonous block, emplaced in the Hong Kong region during the late Middle Jurassic.\n          <\/jats:p>\n          <jats:p content-type=\"supplementary-material\">\n            <jats:bold>Supplementary material:<\/jats:bold>\n            A full dataset of U\u2013Pb dating and Hf isotope analysis of detrital zircons, stratigraphic drillhole logs and a description of the terminology used in this paper are available at\n            <jats:ext-link xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" ext-link-type=\"uri\" xlink:href=\"https:\/\/doi.org\/10.6084\/m9.figshare.c.3736972\">https:\/\/doi.org\/10.6084\/m9.figshare.c.3736972<\/jats:ext-link>\n          <\/jats:p>","DOI":"10.1144\/jgs2016-155","type":"journal-article","created":{"date-parts":[[2017,4,29]],"date-time":"2017-04-29T00:20:22Z","timestamp":1493425222000},"page":"913-928","update-policy":"https:\/\/doi.org\/10.1144\/crossmark-policy","source":"Crossref","is-referenced-by-count":1,"title":["Unravelling an allochthonous, subaqueously deposited volcanic\u2013epiclastic to subaerial andesitic lava assemblage in Hong Kong: age, stratigraphy and provenance studies of the Middle Jurassic Tuen Mun Formation"],"prefix":"10.1144","volume":"174","author":[{"given":"R. J.","family":"Sewell","sequence":"first","affiliation":[{"name":"Hong Kong Geological Survey, Geotechnical Engineering Office, Civil Engineering and Development Department, 101 Princess Margaret Road, Kowloon, Hong Kong, China"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-0673-4884","authenticated-orcid":false,"given":"K. W. F.","family":"So","sequence":"additional","affiliation":[{"name":"Hong Kong Geological Survey, Geotechnical Engineering Office, Civil Engineering and Development Department, 101 Princess Margaret Road, Kowloon, Hong Kong, China"}]},{"given":"D. L. K.","family":"Tang","sequence":"additional","affiliation":[{"name":"Hong Kong Geological Survey, Geotechnical Engineering Office, Civil Engineering and Development Department, 101 Princess Margaret Road, Kowloon, Hong Kong, China"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-0090-5868","authenticated-orcid":false,"given":"A.","family":"Carter","sequence":"additional","affiliation":[{"name":"Department of Earth and Planetary Sciences, Birkbeck, University of London, Malet Street, London WC1E 7HX, UK"}]}],"member":"1881","published-online":{"date-parts":[[2017,4,4]]},"reference":[{"key":"e_1_3_2_2_1","doi-asserted-by":"publisher","DOI":"10.1016\/0037-0738(90)90119-E"},{"key":"e_1_3_2_4_1","series-title":"Geological Memoirs Series","volume-title":"Regional Geology of Guangdong Province","author":"BGMRGP","year":"1988","unstructured":"BGMRGP 1988. Regional Geology of Guangdong Province. Geological Memoirs Series, 1. 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