二连盆地马尼特坳陷西部砂岩型铀矿成矿的沉积学背景
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摘要
在二连盆地马尼特坳陷西部巴彦乌拉地区,有关赛汉组上段砂岩型铀矿储矿砂体的成因目前存有争议。笔者通过地震剖面、钻孔岩心分析和砂分散体系制图,对赛汉组上段进行了成因分析。研究发现,赛汉组具有特征的断坳转换期构造背景并由此决定了其优质铀储层的发育;赛汉组上段并非传统认识上的纵向辫状河成因,而是剥蚀残留的多个侧向上源自巴音宝力格隆起物源区的辫状河三角洲体系的集合体;构造反转和剥蚀作用对赛汉组地层进行了强烈改造,辫状河三角洲遭受强烈剥蚀,保存了具有多个朵状分割性的带状砂体,形成构造天窗和氧化带并发育铀矿化;砂体的平面非均质性控制了铀成矿作用,砂分散体系的变异部位、沉积相变部位是成矿的有利区域。
It is very controversial about the genesis of the sand bodies which host sandstone-type uranium deposits in upper Saihan formation in Bayanwula area of western Manite depression.According to seismic section research,drilling core analysis and mapping of sand distribution,the upper Saihan formation shew typical tectonic background from fault depression to sag and determined the development of highquality uranium reservoir.The upper Saihan formation was not formed by braided stream in the longitudinal axis as traditional recognition.In fact,it is a aggregate of multi-braided deltas with the source from Bayinbaolige uplift which was denuded.Later structral inversion and denudation strongly reformed the Saihan formation,the braided delta suffered strong denudation,some sandbody was remained in multiple flower-shaped strip as the structral fenster in which oxidation was developed with uranium mineralization.Plane heterogeneous of sand body controls uranium mineralization,the variation parts of sand distributed system and sedimentary faces are the favourable region for uranium mineralization.
It is very controversial about the genesis of the sand bodies which host sandstone-type uranium deposits in upper Saihan formation in Bayanwula area of western Manite depression.According to seismic section research,drilling core analysis and mapping of sand distribution,the upper Saihan formation shew typical tectonic background from fault depression to sag and determined the development of highquality uranium reservoir.The upper Saihan formation was not formed by braided stream in the longitudinal axis as traditional recognition.In fact,it is a aggregate of multi-braided deltas with the source from Bayinbaolige uplift which was denuded.Later structral inversion and denudation strongly reformed the Saihan formation,the braided delta suffered strong denudation,some sandbody was remained in multiple flower-shaped strip as the structral fenster in which oxidation was developed with uranium mineralization.Plane heterogeneous of sand body controls uranium mineralization,the variation parts of sand distributed system and sedimentary faces are the favourable region for uranium mineralization.
引文
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[24]林畅松,等.中国东部中新生代断陷盆地幕式裂陷过程的动力学响应和模拟模型[J].地球科学,2004,29(5):583-588.
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[28]马新华,肖安成.内蒙古二连盆地的构造反转历史[J].西南石油学院学报,2000,22(2):1-4.
[2]崔新省.内蒙古二连盆地群晚中生代煤盆地的类型与聚煤特征[J].现代地质,1993,7(4):479-484.
[3]李思田,林畅松.论沉积盆地的等时地层格架和基本建造单元[J].沉积学报,1992,10(4):11-22.
[4]花如洪.内蒙古二连盆地早白垩世被子植物花粉[M].北京:地质出版社,1991.
[5]赵传本.二连盆地早白垩世孢粉组合[M].北京:石油工业出版社,1987.
[6]赵澄林,祝玉衡,等.二连盆地储层沉积学[M].北京:石油工业出版社,1996.
[7]杜金虎,等.二连盆地隐蔽油藏勘探[M].北京:石油工业出版社,2003.
[8]焦贵浩,等.二连裂谷构造演化与油气[M].北京:石油工业出版社,2003.
[9]祝玉衡,等.二连盆地下白垩统沉积相及含油性[M].北京:科学出版社,2000.
[10]卫三元,等.二连盆地晚中生代以来构造沉积演化与铀成矿作用[J].铀矿地质,2000,22(2):76-82.
[11]聂逢君,陈安平,等.内蒙古二连盆地早白垩世砂岩型铀矿目的层时代探讨[J].地层学杂志,2007,131(3):272-279.
[12]凡秀君,聂逢君,等.二连盆地巴彦乌拉地区砂岩型铀矿含矿地层时代与古地理环境探讨[J].铀矿地质,2008,24(3):272-279.
[13]李月湘,于金水,等.二连盆地可地浸砂岩型铀矿找矿方向[J].铀矿地质,2009,25(6):338-343.
[14]张成勇,聂逢君,等.二连盆地巴彦乌拉地区砂岩型铀矿目的层电测井曲线响应分析[J].铀矿地质,2010,26(2):101-107.
[15]秦明宽,赵凤民,等.二连盆地与蒙古沉积盆地砂岩型铀矿成矿条件对比[J].铀矿地质,2009,25(2):78-84.
[16]何中波,秦明宽,等.高分辨率层序地层学特征及砂岩型铀成矿作用——以二连盆地白音乌拉地区赛汉组为例[J].世界核地质科学,2006,23(4):194-198.
[17]肖安成.二连盆地形成的地球动力学背景[J].石油与天然气地质,2001,22(2):137-145.
[18]任建业,李思田,焦贵浩.二连断陷盆地群伸展构造系统及其发育的深部背景[J].地球科学,1998,23(6):567-573.
[19]王同和.大兴安岭以西含油气盆地的构造迁移[J].中国海上油气(地质),1997,11(2):106-110.
[20]陈祖伊,李子颖,等.产铀盆地的形成演化模式及其鉴别标志[J].世界核地质科学,2004,21(3):142.
[21]解习农,等.陆相盆地幕式构造旋回与层序构成[J].地球科学,1996,21(1):27-33.
[22]任建业,等.中国大陆东部晚中生代裂陷作用的表现形式及其幕式扩展[J].现代地质,1996,10(4):526-531.
[23]焦养泉,等.断陷盆地多层次幕式裂陷作用与沉积充填响应——以南堡老第三纪断陷盆地为例[J].地球科学,1996,21(6):633-636.
[24]林畅松,等.中国东部中新生代断陷盆地幕式裂陷过程的动力学响应和模拟模型[J].地球科学,2004,29(5):583-588.
[25]李思田,等.沉积盆地分析基础与应用[M].北京:高等教育出版社,2004.
[26]李心宁,王同和.二连盆地反转构造与油气[J].中国海上油气地质,1997,11.
[27]陈功.二连盆地及邻区铀成矿地质条件及成矿远景评价[R].中国核科技报告,1990.
[28]马新华,肖安成.内蒙古二连盆地的构造反转历史[J].西南石油学院学报,2000,22(2):1-4.
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