西藏昂仁县扯假错渐新统日贡拉组地层沉积相及沉积演化特征
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摘要
沉积相是研究古环境、古气候及岩相古地理的基础与重要依据。本文报道西藏昂仁县扯假错剖面渐新统日贡拉组的岩性特征、基本层序、沉积相及垂向上沉积演化特征。该组为一套紫红色碎屑岩系,为砾岩、砂岩夹粉砂岩和泥质岩,具典型的河流环境沉积特征,为进一步研究该地区该时期的沉积环境提供了线索。
The sedimentary facies analysis is fundamental to all the palaeoenvironmental,palaeoclimatic,and palaeogeographic interpretation in the reconstruction of sedimentary facies and palaeogeography. The present paper gives a detailed description of lithology,basic sequence,sedimentary facies and vertical sedimentary evolution of the Oligocene Rihongla Formation in the Chejiaco area,Ngamring,Xizang. The Rihongla Formation consists dominantly of a succession of purplish red terrigenous siliclastic rocks including conglomerates,sandstones,siltstones and mudstones which are indicative of a typical fluvial sedimentary environment. The channel subfacies in this Formation may be subdivided into the channel bar,point bar and channel lag microfacies,and laid down in the mountainous areas to alluvial plains during the Oligocene.
The sedimentary facies analysis is fundamental to all the palaeoenvironmental,palaeoclimatic,and palaeogeographic interpretation in the reconstruction of sedimentary facies and palaeogeography. The present paper gives a detailed description of lithology,basic sequence,sedimentary facies and vertical sedimentary evolution of the Oligocene Rihongla Formation in the Chejiaco area,Ngamring,Xizang. The Rihongla Formation consists dominantly of a succession of purplish red terrigenous siliclastic rocks including conglomerates,sandstones,siltstones and mudstones which are indicative of a typical fluvial sedimentary environment. The channel subfacies in this Formation may be subdivided into the channel bar,point bar and channel lag microfacies,and laid down in the mountainous areas to alluvial plains during the Oligocene.
引文
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[20]谭程鹏,于兴河,李胜利,等.辫状河-曲流河转换模式讨论[J].沉积学报,2014,32(3):450-457.
[21]廖保方,张为民,李列,等.辫状河现代沉积研究与相模式[J].沉积学报,1998,16(1):34-39.
[22]李胜利,于兴河,姜涛,等.河流辫-曲转换特点与废弃河道模式[J].沉积学报,2017,35(1):1-8.
[23]董清水,孙雷,楼仁兴,等.松辽盆地南部小城子地区下白垩统泉一段辫状河沉积判识标志与分布特征[J].石油实验地质,2014,36(2):129-134.
[2]Mo X X,Niu Y L,Dong G C,et al.Contribution of syncollisiona felsic magmatism to continental crust growth:A case study of the Paleogene Linzizong volcanic Succession in southern Tibet[J].Chemical Geology,2008,250:49-67.
[3]王辉,赵兵.西藏西部昂拉仁错地区多桑地堑芒乡组的特征及时代[J].地质通报,2010,29(4):544-548.
[4]朱迎堂,方小敏,高军平,等.青藏高原南部乌郁盆地渐新世-上新世地层沉积相分析[J].沉积学报,2006,24(6):775-781.
[5]谭富文,王剑,王小龙,等.西藏羌塘盆地---中国油气资源战略选区的首选目标[J].沉积与特提斯地质,2002,22(1):17-20.
[6]刘函,李奋其,周放,等.拉萨地块西段尼雄地区晚古生代地震事件及其地质意义[J].地球科学,43(8):2767-2776.
[7]苟正彬,刘函,李俊,等.拉萨地块中北部尼雄地区早白垩世火山岩的成因及构造意义[J].地球科学,2018,43(8):2781-2790.
[8]张克信,王国灿,骆满生,等.青藏高原新生代构造岩相古地理演化及其对构造隆升的响应[J].地球科学(中国地质大学学报),2010(05):697-712.
[9]潘裕生,钟嘉猷,周勇.青藏高原南北向地堑系的实验研究[J].地质科学,2003,38(2):172-178.
[10]Xu B,Griffin W L,Qing X,et al.Ultrapotassic rocks and xenoliths from South Tibet:Contrasting styles of interaction between lithospheric mantle and asthenosphere during continental collision[J].The Geological Society of America,2017013|doi:10.1130/G38466.1.
[11]王力圆,郑有业,高顺宝,等.西藏吉瓦地区渐新统日贡拉组物源分析及找矿意义[J].吉林大学学报(地球科学版),2014,44(4):1097-1106.
[12]郭岭,姜在兴,李瑞锋.一种辫状河、曲流河复合沉积体层序特征及其成因[J].大庆石油学院学报,2011,35(2):29-33.
[13]Gary Nichols.Sedimentology and Stratigraphy[M].Wiley-Blackwell Pubilication,2007.5-149.
[14]Selly,R C.Ancient Sedimentary Environment 2ndedition[M].New York:Cornell University Press,1978.287.
[15]何顺利,兰朝利,门成全.苏里格气田储层的新型辫状河沉积模式[J].石油学报,2005,26(6):25-29.
[16]惠浪波,郭进京,赵海涛,等.西秦岭岷县地区红层砂岩成因分析平[J].沉积与特提斯地质,2016,36(2):38-45.
[17]秦守荣,张明发,况忠,等.贵州茅台组的沉积环境[J].沉积与特提斯地质,2015,35(4):44-47.
[18]王剑,谭富文,付修根,等.沉积岩工作方法[M].北京:地质出版社,2015.7-201.
[19]吴亮君,赵大林,吕世聪,等.松辽盆地南部永平地区泉四段沉积微相及沉积演化研究[J].沉积与特提斯地质,2016,36(3):47-58.
[20]谭程鹏,于兴河,李胜利,等.辫状河-曲流河转换模式讨论[J].沉积学报,2014,32(3):450-457.
[21]廖保方,张为民,李列,等.辫状河现代沉积研究与相模式[J].沉积学报,1998,16(1):34-39.
[22]李胜利,于兴河,姜涛,等.河流辫-曲转换特点与废弃河道模式[J].沉积学报,2017,35(1):1-8.
[23]董清水,孙雷,楼仁兴,等.松辽盆地南部小城子地区下白垩统泉一段辫状河沉积判识标志与分布特征[J].石油实验地质,2014,36(2):129-134.
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