安徽沿江地区中三叠世砾岩成因再讨论
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摘要
中三叠世周冲村组砾岩作为研究金子运动存在与否的重点之一,其成因争议较大。本次研究发现安徽沿江地区该段砾岩存在多种成因,而并非前人认为的属单一的膏溶或岩溶成因。下部砾石以斜坡重力流、膏溶、岩溶及洞穴垮塌成因为主,上部砾石以搬运成因为主,且周冲村组沉积相与上覆黄马青组沉积相迥异,说明两者之间存在着明显的沉积转换界面。
As one of the key points on the existence of Jinzi Movement research,geologists had a bitter controversy over the breccias petrogenesis of Zhouchongcun Group in the Middle Triassic. In this study,multiple types of petrogenesis about the mentioned breccias have been discovered in the area along the Yangtze River of Anhui,rather than the gypsumcause or karst-cause which is the single one in predecessors' studies. The gravity-flow on slopes,gypsum-cause,karstcause and cave-collapse make the major contributions of petrogenesis in the lower part breccias,and transport function is the main petrogenesis in the upper part breccias. and there have a lot of differences about the sedimentary faces between Zhouchongcun Group and Huangmaqing Group which can indicate the apparently existence of sedimentary transformation surfaces between them.
As one of the key points on the existence of Jinzi Movement research,geologists had a bitter controversy over the breccias petrogenesis of Zhouchongcun Group in the Middle Triassic. In this study,multiple types of petrogenesis about the mentioned breccias have been discovered in the area along the Yangtze River of Anhui,rather than the gypsumcause or karst-cause which is the single one in predecessors' studies. The gravity-flow on slopes,gypsum-cause,karstcause and cave-collapse make the major contributions of petrogenesis in the lower part breccias,and transport function is the main petrogenesis in the upper part breccias. and there have a lot of differences about the sedimentary faces between Zhouchongcun Group and Huangmaqing Group which can indicate the apparently existence of sedimentary transformation surfaces between them.
引文
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[2]邓永高.下扬子地区印支运动[J].地质论评,1980,26(5):430-435.
[3]孙万铨,霍秀峰.关于南京地区青龙群顶部砾岩成因的商榷兼论“金子运动”问题[J].石油地质与天燃气,1981,2(4):382-388.
[4]董树文,言景爽,李勇,等.下扬子中三叠世—中侏罗世沉积相与印支运动[J].地质论评,1994,40(2):111-119.
[5]喻德渊.淮阳山脉中之主要造山运动——淮阳运动[J].中国地质学会志,1945,25(1/4):309-314.
[6]施央申,沈修志,马瑞士,等.论地质构造的继承和上迭原则——根据浙西加里东地槽海西构造和宁镇山脉侏罗系构造形成和发展的研究[J].南京大学学报(自然科学版),1963(1):33-39.
[7]叶敬仁.从宁镇地区的构造一岩浆活化过程讨论金子运动的性质[J].大地构造与成矿学,1984,8(3):285-295.
[8]周育才,陈玉屾.关于铜陵、繁昌地区印支运动的讨论[J].安徽地质,1992(3):71-78.
[9]袁在枢.对鄂东南地区印支运动的新认识——谈它和本区褶皱形成、岩浆活动和矽卡岩型铜铁矿床成矿等的关系问题[J].地质论评,1965,23(5):401-403.
[10]胡光明,张亚金,周雁.从中下三叠统膏盐特征看中下扬子早印支运动[J].地质科学,2010,45(3):734-744.
[11]朱森,李掩,李毓尧,等.宁镇山脉地质[J].中央研究院地质研究所集刊:第11号,1935:175-182.
[12]朱光,徐嘉炜,刘国生,等.下扬子地区前陆变形构造格局及其动力学机制[J].中国区域地质,1999,18(1):73-79.
[13]李金华,丁保良.苏皖地区的“黄马青群”[J].地质论评,1982(2):101-107.
[14]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.
[15]常印佛,刘湘培,吴言昌.长江中下游铜铁成矿带[M].北京:地质出版社,1991:65-89.
[16]罗庆坤,刘国生,吴弘毅,等.论下扬子区伸展构造环境下半地堑内沉积的黄马青群[M]//钱祥麟.伸展构造研究.北京:地质出版社,1994:37-47.
[17]朱光,徐嘉炜,刘国生,等.下扬子地区沿江前陆盆地形成的构造控制[J].地质论评,1998(2):120-129.