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However, the timing and causal relationships of this event are in dispute. This study concentrates on the deep-water chert\u2013mudstone strata of the Gufeng Formation and its transition to the Yinping Formation at Chaohu. Zircons from tuffs in the uppermost Gufeng Formation yield a U\u2013Pb age of 261.6\u2009\u00b1\u20091.6\u2005Ma, and comparison with sections around Emeishan suggests that the tuffs appeared in the\n            <jats:italic>Jinogondolella altudaensis<\/jats:italic>\n            conodont zone and persisted to the\n            <jats:italic>Jinogondolella xuanhanensis<\/jats:italic>\n            zone. This coincides with the Emeishan eruptions, and suggests that the tuffs probably derived from this province. Mineralogical and geochemical characteristics also show the tuffs are of acid volcanogenic origin and have a geochemical fingerprint of the Emeishan large igneous province. Our dating shows that a crisis amongst radiolarian and a subsequent productivity decline occurred during the middle Capitanian, prior to the Guadalupian\u2013Lopingian boundary. The Emeishan eruptions began immediately before this, indicating a likely causal relationship between these events. Major regression and marine anoxia\/euxinia are two other important extinction-relevant environmental changes that occurred during this critical interval.\n          <\/jats:p>","DOI":"10.1144\/jgs2018-137","type":"journal-article","created":{"date-parts":[[2019,2,12]],"date-time":"2019-02-12T14:48:51Z","timestamp":1549982931000},"page":"588-608","update-policy":"https:\/\/doi.org\/10.1144\/crossmark-policy","source":"Crossref","is-referenced-by-count":28,"title":["New timing and geochemical constraints on the Capitanian (Middle Permian) extinction and environmental changes in deep-water settings: evidence from the Lower Yangtze region of South China"],"prefix":"10.1144","volume":"176","author":[{"given":"Bolin","family":"Zhang","sequence":"first","affiliation":[{"name":"MOE Key Laboratory of Surficial Geochemistry, School of Earth Sciences and Engineering, Nanjing University, Nanjing 210023, China"}]},{"given":"Suping","family":"Yao","sequence":"additional","affiliation":[{"name":"MOE Key Laboratory of Surficial Geochemistry, School of Earth Sciences and Engineering, Nanjing University, Nanjing 210023, China"}]},{"given":"Paul B.","family":"Wignall","sequence":"additional","affiliation":[{"name":"School of Earth and Environment, University of Leeds, Leeds LS2 9JT, UK"}]},{"given":"Wenxuan","family":"Hu","sequence":"additional","affiliation":[{"name":"MOE Key Laboratory of Surficial Geochemistry, School of Earth Sciences and Engineering, Nanjing University, Nanjing 210023, China"}]},{"given":"Biao","family":"Liu","sequence":"additional","affiliation":[{"name":"MOE Key Laboratory of Surficial Geochemistry, School of Earth Sciences and Engineering, Nanjing University, Nanjing 210023, China"}]},{"given":"Yongle","family":"Ren","sequence":"additional","affiliation":[{"name":"MOE Key Laboratory of Surficial Geochemistry, School of Earth Sciences and Engineering, Nanjing University, Nanjing 210023, China"}]}],"member":"1881","published-online":{"date-parts":[[2019,3,15]]},"reference":[{"key":"e_1_3_3_2_1","doi-asserted-by":"publisher","DOI":"10.1144\/0016-764901086"},{"key":"e_1_3_3_3_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.lithos.2004.09.013"},{"key":"e_1_3_3_4_1","doi-asserted-by":"publisher","DOI":"10.1346\/CCMN.1990.0380601"},{"key":"e_1_3_3_5_1","doi-asserted-by":"publisher","DOI":"10.1016\/S0009-2541(02)00195-X"},{"key":"e_1_3_3_6_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.jseaes.2011.07.020"},{"key":"e_1_3_3_7_1","doi-asserted-by":"publisher","DOI":"10.1007\/s00410-002-0364-7"},{"key":"e_1_3_3_8_1","doi-asserted-by":"publisher","DOI":"10.1016\/0016-7037(84)90089-9"},{"key":"e_1_3_3_9_1","doi-asserted-by":"publisher","DOI":"10.1016\/0016-7037(83)90151-5"},{"key":"e_1_3_3_10_1","doi-asserted-by":"publisher","DOI":"10.1130\/0091-7613(1984)12<365:CMFDFF>2.0.CO;2"},{"key":"e_1_3_3_11_1","doi-asserted-by":"publisher","DOI":"10.1666\/0094-8373-35.4.465"},{"key":"e_1_3_3_12_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.earscirev.2010.07.004"},{"key":"e_1_3_3_13_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.palaeo.2010.03.056"},{"key":"e_1_3_3_14_1","doi-asserted-by":"publisher","DOI":"10.1130\/B31216.1"},{"key":"e_1_3_3_15_1","volume-title":"Stratigtaphic record of Anhui Province","author":"Bureau of Geology and Mineral Resources of Anhui Province","year":"1989","unstructured":"Bureau of Geology and Mineral Resources of Anhui Province 1989. 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