地质通报2013，Vol.32Issue(2)：424-442,19.
新疆吐鲁番-哈密盆地北部下二叠统伊尔稀土组的沉积征与盆地演化
Sedimentology and basin evolution of the Early Permian Yierxitu Formation in Turpan-Hami area, Xinjiang
摘要
Abstract
The Early Permian Yierxitu Formation widely distributed in Turpan-Hami area of Xinjiang provides a record of paleocli-mate, paleogeography, basin and tectonic evolution in the Early Permian period. There exists much controversy concerning sedimen-tology, basin evolution and tectonic background of the Yierxitu Formation. This paper briefly reviewed previous researches on the Yierxicu Formation in Turpan-Hami area. Furthermore, on the basis of geological survey, the authors studied stratigraphy, sedimentary facies, provenance and paleocurrents of the Yierxitu Formation, and the results indicate that the Yierxitu Formation was spatially and temporally involved in an evolution of sedimentary facies from alluvial fan or river to shallow lake, semi-deep or deep lake in upward succession. Volcanic lithological associations of the Yierxitu Formation are characterized by the bimodal volcanic rock assemblages of olivine basalt, basaltic andesite and rhyolite. The distribution of lithofacies and lithological associations indicates that the volcanic constituents of the Yierxitu Formation gradually increase from west to east, which means the volcanic activities were stronger in the east than in the west. Meanwhile, marine flysch formations intercalated with volcanic rocks were developed in the northern Bogda Mountain. Petrologic characteristics and geochemistry show that, in the northern Bogda Mountain, there existed bimodal volcanic rock assemblages. Studies show that marine rift existed in the northern Bogdashan Mountain whereas a continental rift occurred in the southern Bogda Mountain. Paleocurrents show a bio-direction pattern, and currents from the northern and southern Bogda Mountain were concentrated in the central Bogda Mountain area (the center of the rift). Provenance analysis shows that conglomerate sediments of the Early and Middle Permian period in northern Turpan-Hami area are mainly composed of andesite, tufts and rhyolitic volcanics as well as sandstone, silica or limestones, suggesting that they were derived from the underlying Devonian and Carboniferous strata.关键词
吐鲁番-哈密北部/早二叠世/伊尔稀土组/沉积相/物源/古水流/裂谷环境Key words
Turpan-Hami area/ Early Permian/ Yierxitu Formation/ sedimentary facies/ provenances/ paleocurrents/ rift分类
天文与地球科学引用本文复制引用
徐加林,刘燕学,柳永清,旷红伟,彭楠,许欢,陈军,杜冬霞,刘海..新疆吐鲁番-哈密盆地北部下二叠统伊尔稀土组的沉积征与盆地演化[J].地质通报,2013,32(2):424-442,19.基金项目
国家自然科学基金项目《晚中生代华北克拉通破坏的古环境剧变与生物群更替响应》(批准号:90914003),中国地质调查局项目《鲁东白垩纪大型脊椎动物群及相关地层与沉积、古地理背景调查研究》(编号:1212011085477)、《北疆-内蒙二叠纪沉积盆地演化与大地构造属性》(编号:1212011121067)、《兴蒙造山带基本构造格局综合调查和研究》(编号:1212011085476)和中国地质科学院地质研究所基本业务费项目《胶莱盆地恐龙化石埋藏学及古生态与古地理意义》(编号:J1006) （批准号:90914003）
