东准卡姆斯特地区中侏罗—渐新世古气候环境分析及对砂岩型铀矿的影响
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摘要
砂岩型铀矿属沉积盆地内表生水渗入成矿类型,古气候条件、沉积环境对含矿建造的形成、后生改造及铀元素的富集成矿等具重要影响。本次研究主要对该区内多个钻孔不同层位、不同颜色岩石系统采样测试,据测试结果对卡姆斯特地区不同地质时期岩石地球化学特征及古气候条件、沉积环境进行研究,并探讨古气候条件对该区铀元素迁移富集的影响。本次共采取234件侏罗—新近系岩石样品,开展常、微量元素分析、有机碳含量分析及粘土矿物相对含量分析。结果表明,从中侏罗世西山窑期至古近纪中晚期研究区气候总体为温湿-干旱,中侏罗世头屯河期早期沿袭了温湿气候,后期逐渐向干旱转变,为一个气候过渡期,有利于卡姆斯特地区与氧化带相关铀成矿作用的发育。
The sandstone-type uranium deposit belongs to the type of the mineralization that sedimentary basin in which the surface water infiltrates for mineralizing,the paleoclimatic conditions and depositional environment have important effects on the construction of ore-bearing, the epigenetic alteration and the enrichment of uranium elements for mineralization.In this study, the systematic sampling and testing of rock samples from different layers and various color rock systems in multiple boreholes in this area were carried out.According to the test results, the geochemical characteristics of rocks formed in different geological periods,paleoclimatic conditions and sedimentary environment in Kamuster area were studied, and the influence of paleoclimatic conditions on the migration and enrichment of uranium elements in this area was discussed.In this study, a total of 234 Jurassic-neogene rock samples were taken for the analysis of ordinary and trace elements,organic carbon content and relative content of clay minerals.The results show that the area from the Xishanyao period in middle Jurassic to the middle-late paleogene had a climate that is generally by temperature humiditydrought,the early of Toutunhe period in middle Jurassic followed humid climate,which gradually became drought in the late and it was a transitional climate that is benefit to the development of regional uranium mineralization is associated with the oxidation zone in this area.
The sandstone-type uranium deposit belongs to the type of the mineralization that sedimentary basin in which the surface water infiltrates for mineralizing,the paleoclimatic conditions and depositional environment have important effects on the construction of ore-bearing, the epigenetic alteration and the enrichment of uranium elements for mineralization.In this study, the systematic sampling and testing of rock samples from different layers and various color rock systems in multiple boreholes in this area were carried out.According to the test results, the geochemical characteristics of rocks formed in different geological periods,paleoclimatic conditions and sedimentary environment in Kamuster area were studied, and the influence of paleoclimatic conditions on the migration and enrichment of uranium elements in this area was discussed.In this study, a total of 234 Jurassic-neogene rock samples were taken for the analysis of ordinary and trace elements,organic carbon content and relative content of clay minerals.The results show that the area from the Xishanyao period in middle Jurassic to the middle-late paleogene had a climate that is generally by temperature humiditydrought,the early of Toutunhe period in middle Jurassic followed humid climate,which gradually became drought in the late and it was a transitional climate that is benefit to the development of regional uranium mineralization is associated with the oxidation zone in this area.
引文
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[10]陈涛,王欢,张祖青.粘土矿物对古气候指示作用浅析[J].岩石矿物学杂志,2003,2(4):416-419.
[11]洪汉烈.粘土矿物古气候意义研究的现状与展望[J].地质科技情报,2010,29(1):1-6.
[12]黄思静.混层伊利石-蒙脱石的鉴定及其成岩意义[J].岩相古地理,1990,5:23-28.
[13]王粉丽,洪汉烈,殷科等.循化盆地中新世沉积物粘土矿物的特征及其古气候指示[J].地球科学—中国地质大学学报,2010,35(5):829-836.
[14]王国栋,程日辉,于民凤等.沉积物的矿物和地球化学特征与盆地构造、古气候背景[J].吉林大学学报(地球科学版),2006,36(2):202-206.
[15]杜杰,唐湘飞.新疆卡姆斯特地区中侏罗统铀成矿控制因素与找矿前景[J].铀矿地质,2017,33(3):129-136.
[16]马克西莫娃,什玛廖维奇.层间渗入成矿作用[M].核工业西北地质局二〇三所.1996,12-13.
[17] Dietz R S.Clay minerals in recent marine sediments[D].Urbana:University of Illinois,1941.
[18] Millot G.Geology of clays:Weathering,sedimentology,geochemistry[M].New York:Springer-Verlag,1970,1-429.
[2]杨烨,何中波.准噶尔盆地中新生代古气候演化特征及对砂岩型铀成矿作用的制约[J].世界核地质科学,2016,33(3):140-145.
[3]金明,李妩巍.乌兰花地区下白垩统、上新统岩石地球化学特征及其古气候演变[J].铀矿地质,2003,19(6):349-353.
[4]许中杰,程日辉,沈艳杰等.闽西南地区晚三叠-早侏罗世温湿-干热气候转变的沉积记录[J].中国矿业大学学报,2012,41(5):783-791.
[5]王明振,吴朝东,王陆新等.准噶尔盆地南缘侏罗系泥岩粘土矿物组合及地球化学特征[J].矿物岩石地球化学通报,2014,33(4):421-429.
[6]靳建辉,李志忠,陈秀玲,等.新疆伊犁塔克尔莫乎尔沙漠全新世晚期沉积微量元素反映的古气候变化[J].沉积学报,2011,29(2):336-346.
[7]陈敬安,万国江,陈振楼等.洱海沉积物化学元素与古气候演化[J].地球化学,1999,28(6):
[8]邓宏文,钱凯.沉积地球化学与环境分析[M].甘肃科学技术出版社,1993:4-63.
[9]王益友,郭文莹,张国栋.几种地球化学标志在金湖凹陷阜宁群沉积环境中的应用[J].同济大学学报,1979,2:51-60.
[10]陈涛,王欢,张祖青.粘土矿物对古气候指示作用浅析[J].岩石矿物学杂志,2003,2(4):416-419.
[11]洪汉烈.粘土矿物古气候意义研究的现状与展望[J].地质科技情报,2010,29(1):1-6.
[12]黄思静.混层伊利石-蒙脱石的鉴定及其成岩意义[J].岩相古地理,1990,5:23-28.
[13]王粉丽,洪汉烈,殷科等.循化盆地中新世沉积物粘土矿物的特征及其古气候指示[J].地球科学—中国地质大学学报,2010,35(5):829-836.
[14]王国栋,程日辉,于民凤等.沉积物的矿物和地球化学特征与盆地构造、古气候背景[J].吉林大学学报(地球科学版),2006,36(2):202-206.
[15]杜杰,唐湘飞.新疆卡姆斯特地区中侏罗统铀成矿控制因素与找矿前景[J].铀矿地质,2017,33(3):129-136.
[16]马克西莫娃,什玛廖维奇.层间渗入成矿作用[M].核工业西北地质局二〇三所.1996,12-13.
[17] Dietz R S.Clay minerals in recent marine sediments[D].Urbana:University of Illinois,1941.
[18] Millot G.Geology of clays:Weathering,sedimentology,geochemistry[M].New York:Springer-Verlag,1970,1-429.
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