| 合肥盆地三尖铺组~(40)Ar-~(39)Ar同位素年代地层学研究 |
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| 引用本文： | 王道轩,金福全,谢宪德,刘因.合肥盆地三尖铺组~(40)Ar-~(39)Ar同位素年代地层学研究[J].地层学杂志,2000(3). |
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| 作者姓名： | 王道轩 金福全 谢宪德 刘因 |
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| 作者单位： | 合肥工业大学!安徽合肥230009(王道轩，金福全，刘因)，安徽石油勘探公司!安徽合肥230022(谢宪德) |
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| 基金项目： | 中国石油天然气总公司《中国北方侏罗系划分与对比研究》( 970 2 -0 7-0 1)资助项目 |
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| 摘 要： | 合肥盆地南缘中生代红层层序及时代 ,由于缺乏可靠的化石依据 ,曾几经变动人为因素很大。根据三尖铺组红层中泥岩在沉积或成岩作用条件下形成的伊利石之 40 Ar- 39Ar定年 ,其坪年龄为 15 7.7～ 15 9.5 Ma,等时线年龄为 15 7.2～ 15 9.9Ma,并用 K- Ar法测年进行对比和验证 ,其值为 15 1.8～ 15 5 .8Ma,故确定其时代下限应为中侏罗世晚期 (卡洛维期 ) ,上限可能达晚侏罗世早期 (牛津期 )。40 Ar- 39Ar坪年龄谱还记录了晚侏罗世—早白垩世岩浆活动热事件信息 ,以及三尖铺组红层中陆源碎屑之母岩 (云母片岩及片麻岩等 )形成的冷却史。
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| 关 键 词： | 三尖铺组 侏罗系 ~(40Ar-~(39)Ar测年 同位素年代地层学 合肥盆地 安徽 |
Studies of ~(40)Ar-~(39)Ar Isotopic Chronostratigraphy of the Sanjianpu Formation in the Hefei Basin, Anhui |
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| WANG Dao xuan ,JIN Fu quan ,XIE Xian de ,and LIU Yin.Studies of ~(40)Ar-~(39)Ar Isotopic Chronostratigraphy of the Sanjianpu Formation in the Hefei Basin, Anhui[J].Journal of Stratigraphy,2000(3). |
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| Authors: | WANG Dao xuan JIN Fu quan XIE Xian de and LIU Yin |
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| Institution: | WANG Dao xuan 1),JIN Fu quan 1),XIE Xian de 2),and LIU Yin 1) |
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| Abstract: | Sequence and ages of the Mesozoic red beds on the southern margin of the Hefei Basin have been arbitrarily modified for several times. The 40 Ar 39 Ar dating of illite samples forming under the conditions of the deposition and diagnoses, from the mudstones of the Sanjianpu Formation red beds, gives plateau age of 157.7~159.5 Ma, as a isochron age of 157.2~159.9 Ma, and a K Ar age of 151.8~155.8 Ma, suggesting that the lower limit of the Sanjianpu Formation is latest Middle Jurassic (Callovian stage) in age and its upper limit is of earliest Late Jurassic (Oxford stage) age. The 40 Ar 39 Ar age spectrum also records a thermal event during the Late Jurassic to Early Cretaceous and cooling history of the parent rocks (mica schist, gneisse, etc.) of the terrigenous debris of the Sanjianpu Formation red beds. |
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| Keywords: | Sanjianpu Formation red beds Jurassic illite 40 Ar 39 Ar age isotopic chronostratigraphy Hefei basin Anhui |
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