| 湖北大洪山打鼓石群沉积时限——来自碎屑锆石U-Pb年龄的证据 |
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| 引用本文： | 刘浩,徐大良,魏运许,邓新,彭练红.湖北大洪山打鼓石群沉积时限——来自碎屑锆石U-Pb年龄的证据[J].地质通报,2017,36(5):715-725. |
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| 作者姓名： | 刘浩 徐大良 魏运许 邓新 彭练红 |
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| 作者单位： | 1. 中国地质调查局武汉地质调查中心, 湖北 武汉 430205;2. 中国地质调查局古生物与生命-环境协同演化重点实验室, 湖北 武汉 430205 |
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| 基金项目： | 中国地质调查局项目《湘西-鄂西成矿带关键地区地质调查》（编号：12120113061700）、《武当-桐柏-大别成矿带关键地区地质调查》（编号：12120113067900） |
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| 摘 要： | 出露于扬子北缘大洪山地区的打鼓石群是扬子地区保留比较完整的中元古代地层,其上被青白口系花山群不整合覆盖。通常认为其与神农架群时代相当,但缺乏物源及同位素地质年代学证据。首次报导了打鼓石群底部太阳寺组砂岩的碎屑锆石U-Pb年龄。测年结果显示,该砂岩中碎屑锆石最古老的年龄为3.1~3.2Ga,最年轻年龄为1124Ma,并在2.65Ga和2.75Ga出现统计峰值,且年龄组成与崆岭杂岩区和杨坡杂岩区的多期岩浆活动具有较好的可比性。而鄂西地区神农架群沉积于1.1~1.4Ga,主要统计峰值年龄为1.6Ga、2~2.1Ga、2.7~2.8Ga。因此,打鼓石群沉积时间晚于神农架群,两者非同物异名。
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| 关 键 词： | 大洪山 打鼓石群 碎屑锆石 神农架群 崆岭杂岩 杨坡杂岩 |
| 收稿时间： | 2016/7/18 0:00:00 |
| 修稿时间： | 2017/4/17 0:00:00 |
Depositional age of the Dagushi Group in the Dahong Mountain,Hubei Prov-ince:Evidence from U-Pb ages of detrital zircons |
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| LIU Hao,XU Daliang,WEI Yunxu,DENG Xin and PENG Lianhong.Depositional age of the Dagushi Group in the Dahong Mountain,Hubei Prov-ince:Evidence from U-Pb ages of detrital zircons[J].Geologcal Bulletin OF China,2017,36(5):715-725. |
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| Authors: | LIU Hao XU Daliang WEI Yunxu DENG Xin and PENG Lianhong |
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| Institution: | 1. Wuhan Center of Geological Survey, CGS, Wuhan 430205, Hubei, China;2. Key Laboratory of Paleontology and Coevolution of Life, CGS, Wuhan 430205, Hubei, China |
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| Abstract: | The Dagushi Group,spread on the northern margin of the Yangtze Craton,is a well-preserved succession of the Mesopro-terozoic strata in South China,unconformably overlain by the Huashan Group.It is generally considered to have the same age as the Shennongjia Group.However,the isotopic geochronological evidence of material source is relatively insufficient.Detrital zircon UPb dating results of sandstone from Taiyangsi Formation on the bottom of Dagushi Group are first reported in this paper.The dating re-sults demonstrate that the oldest and youngest ages are 3.1~3.2Ga and 1124Ma,respectively.There are two age peaks of 2.65Ga and 2.75Ga in the detrital zircon.Its detrital zircon ages are consistent with the multi-period magmatic activities in Kongling Complex and Yangpo Complex before Neoproterozoic.Nevertheless,the Shennongjia Group,widely distributed in western Hubei Province,was deposited from 1.4Ga to 1.1Ga with three age peaks of 1.6Ga,2~2.1Ga and 2.7~2.8Ga.These data indicate that the Dagushi Group was deposited obviously later than the Shennongjia Group,and hence they do not belong to the same stratigraphic sequence. |
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| Keywords: | Dahongshan Dagushi Group detrital zircon Shennongjia Group Kongling Complex Yangpo Complex |
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