庐枞地区下白垩统罗河组的建立及其特征
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摘要
庐枞火山岩盆地北西侧的断陷盆地内沉积了大量以杨湾组、赤山组等为代表的红色岩纪地层。在找矿勘查过程中发现,罗河地区深部杨湾组地层之下存在一套普遍含有纹层状硬石膏的深灰色薄层泥质粉砂岩、含硬石膏粉砂质页岩地层,局部形成了膏盐矿层,其与杨湾组地层的岩性、岩相等特征差异较大,并不整合覆盖在早白垩世火山岩地层之上。鉴于其与上下地层的差异性,以及其本身的独特性,建议单独建立一个岩石地层单位,命名为"罗河组"。该组岩石地层单位的建立,完善了区域下白垩统地层系统,对断陷盆内层序地层、岩相分析、构造演化的研究以及指导找矿都具重要意义。
Widespread red formations represented by the Yangwan Formation and Chishan Formation deposited in the rifted basin to the northwest of the Lu-Zong volcanic basin.It was discovered in mineral exploration that in the depth of the Luohe area,the Yangwan Formation is underlain by a formation of dark grey thin-bedded muddy siltstone with widespread laminated anhydrite and anhydrite-bearing silty shale,which locally forms gypsum-salt ore formation and differs greatly from the Yangwan Formation in lithology,lithofacies,etc.and overlies early Cretaceous volcanic strata unconformably.So,a new lithostratigraphic unit called Luohe Formation is proposed for it,which makes the lower Cretaceous formations complete and is significant to study of sequence strata,lithofacies analysis and structural evolution,as well as to mineral exploration.
Widespread red formations represented by the Yangwan Formation and Chishan Formation deposited in the rifted basin to the northwest of the Lu-Zong volcanic basin.It was discovered in mineral exploration that in the depth of the Luohe area,the Yangwan Formation is underlain by a formation of dark grey thin-bedded muddy siltstone with widespread laminated anhydrite and anhydrite-bearing silty shale,which locally forms gypsum-salt ore formation and differs greatly from the Yangwan Formation in lithology,lithofacies,etc.and overlies early Cretaceous volcanic strata unconformably.So,a new lithostratigraphic unit called Luohe Formation is proposed for it,which makes the lower Cretaceous formations complete and is significant to study of sequence strata,lithofacies analysis and structural evolution,as well as to mineral exploration.
引文
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[16]李凤强,陈令才,刘青.安徽省定远盆地石膏、岩盐矿床成因探讨及其找矿方向[J].安徽地质,2007,17(3):187~189.
[17]兰君,刘永俊,罗奇.山东大汶口盆地赵家店石膏矿床地质特征及成因探讨[J].中国非金属矿工业导刊,2015(5):41~43.269
[2]任启江,刘孝善,徐兆文,等.安徽庐枞中生代火山构造洼地及其成矿作用[M].北京:地质出版社,1991.
[3]汤家富,陆三明,李建设,等.安徽庐枞火山岩盆地与邻区基底构造变形、形成演化及其对矿床分布的控制[J].岩石学报,2010,26(9):2587~2597.
[4]董树文,高锐,吕庆田,等.庐江-枞阳矿集区深部结构与成矿[J].地球学报,2009,30(3):279~284.
[5]董树文,项怀顺,高锐,等.长江中下游庐江-枞阳火山岩矿集区深部结构与成矿作用[J].岩石学报,2010,26(9):2529~2542.
[6]安徽省地质矿产局.安徽省区域地质志[M].北京:地质出版社,1987.
[7]安徽省地质矿产局区域地质调查队.安徽地层志白垩系分册[M].合肥:安徽科学技术出版社,1988.
[8]张舒,吴明安,汪晶,等.安徽庐枞盆地与正长岩有关的成矿作用[J].地质学报,2014a,88(4):519~531.
[9]刘彦,吕庆田,严加永,等.庐枞矿集区结构特征重磁研究及其成矿指示[J].岩石学报,2012,28(10):3125~3138.
[10]肖晓,王显莹,汤井田,等.安徽庐枞矿集区大地电磁探测与电性结构分析[J].地质学报,2014.88(4):478~495.
[11]吕庆田,刘振东,汤井田,等.庐枞矿集区上地壳结构与变形:综合地球物理探测结果[J].地质学报,2014.88(4):447~465.
[12]朱光,王道轩,刘国生,等.郯庐断裂带的伸展活动及其动力学背景[J].地质科学,2001,36(3):269~278.
[13]周涛发,范裕,袁峰,等.安徽庐枞(庐江-枞阳)盆地火山岩的年代学及其意义[J].中国科学D辑,2008,38(11):1342~1353.
[14]中国科学院贵阳地化所译.锶同位素地球化学[M].北京:科学出版社,1975.
[15]刘刚,周东升.微量元素分析在判别沉积环境中的应用-以江汉盆地潜江组为例[J].石油实验地质,2007,29(3):307~314.
[16]李凤强,陈令才,刘青.安徽省定远盆地石膏、岩盐矿床成因探讨及其找矿方向[J].安徽地质,2007,17(3):187~189.
[17]兰君,刘永俊,罗奇.山东大汶口盆地赵家店石膏矿床地质特征及成因探讨[J].中国非金属矿工业导刊,2015(5):41~43.269